Genetic Giants

[Apley44]

Hey everyone, apologies for not posting as often. However, I do thank you if you're still following the story. Here is the next chapter. I'm also impressed by some of the recent stories here. Keep it up. Happy new year, all.

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Chapter 14

Eventually, we decided to take up Dr Steiner's offer to be a part of his research. So he gave us a slot for the next morning at 8am. We weren't the only ones invited, for Dana, Yasmin and Polina too was approached, but they had different slots. The limo picked us up and drove us to the lab located right at the edge of Vegas city, but from the outside, it looked state-of-the-art.

We both wore stringer vests and shorts, with our hands intertwined, Sienna resting her head on my shoulder, as we made our way to the front desk. Because of how huge we both were, from the back, we looked like two bodybuilding dudes, like gym partners, going for a workout. Of course, I WAS a dude, but you have no idea how many times Sienna got mistaken for a male bodybuilder (with long lush hair) because of how massive she was. But from the front, people would be mesmerised by her gorgeous face and luscious smile, unable to believe that a pretty girl like her could put on more muscle mass than history's best male bodybuilders.

"Good morning, Mr and Mrs Cox. Welcome to GenTech. I am Barbara Knowles, Dr Steiner's assistant. Thank you for coming. If you would just follow me, we are gonna bring you to the changing rooms. If you don't mind, we would need you to be fully naked for the entire research process. Would that be ok for you?"

"That would be awesome, Barbara. Jon and I...we LOVE to get naked. If we had a choice, we would be naked 24/7. With bodies as ripped as ours, it would be a waste to hide behind a layer of clothes," Sienna replied, flexing and admiring her gloriously gigantic right bicep to prove her point, all 37 inches of it. "Isn't it beautiful, Barbara?"

"Ahem, yes....uh...it is..." Barbara stuttered.

"Do you wanna touch her?" Sienna teased.

"Uh...well, maybe just for a second." Barbara reached for my wife's bicep, and she took more than a second, even more than ten seconds. I could tell, it was the hardest and sexiest thing she had ever touched.

"Do you wanna kiss it? C'mon kiss it, show big Victoria here some tender, love and care...she just won the Olympia, so you're looking at the biggest, baddest, most beautiful bicep in the world," Sienna said, the gave me a reassuring glance, "not that yours isn't babe."

I grinned. It was no biggie. I liked that Sienna was a better bodybuilder than me. She deserved it. As for Barbara, she just French kissed my wife's bicep like it was her long lost lover.

"Mmm...someone is in love with my beloved Victoria..." Sienna teased again.

Barbara pulled away. "Well who could blame me, your biceps are just...out of this world...please don't tell my husband."

"Aww...that's sweet of you, Barbara. No worries, your secret's safe with us. Now, where is this changing room you speak of? It's time to show you the rest of my gorgeously RIPPED body!"

I couldn't stop being impressed with my wife. Whether it was the fact she managed to turn straight women into lesbians just by flexing her amazing physique, or just feel so confident with herself that she loved to emphasise the word "ripped" when describing herself. Anyways, we entered the changing room and stripped naked, a sense of liberation embracing us. There were full body mirrors placed all over the room, and it would be an insult to ourselves if we didn't check ourselves out every chance we got. Sienna twisted her incredibly shredded midsection for an abdominals pose, with one arm folded behind her head, while the other hand just grabbed her own thick, vascular cock and rubbed, the muscles and veins over her densely-built arms exploding with every movement. She was practically masturbating to her own reflection, which I didn't mind because who wouldn't. I could get an ejaculation just thinking about her. I just did a front lat spread, my lats flaring like butterfly wings, my own boner throbbing.

Barbara, who by now, was blushing and sweating profusely, tried to remind us of our schedule.

"Oops, sorry, Barbara, we got carried away. Are you alright there? You look a bit...flustered. Is it because of my huge, thick, veiny cock over here? Tee-hee, it's a full 12 ½ inches now, and it is certified as the biggest cock in the ENTIRE world. Isn't that impressive? There are like 4 billion men in the world, and NONE of them have a cock bigger than mine. Think about it, the biggest cock in the world, belonging to a girl! But of course, Jon's cock is amazingly huge as well. His is a close second. And I love it just the same!" Sienna leaned down to give my cock a gentle suck. "Tasty!"

"I'm what the Japanese people call a Futanari. A girl having both guy and girl parts. Have you seen my vagina? Ohhh, Jon loves it, and he pleasures my pussy every single night! Maybe your scientists over here can explain why I have a big cock and a sexy pussy at the same time. Not that I'm complaining. I love both my cock and pussy!" Sienna said.

Our first stop was the blood test and MRI. The blood test was quick enough, and from there, they could extract our DNA from the white blood cells to see our genetic composition. It was pretty straightforward. We had an unbelievable pain threshold, a testament to all our soul-crushing workouts, and our veins were just throbbing, so the phlebotomist made light work of us. The MRI was tougher, they had to wheel us off to another more bigger MRI machine in the other block because our bodies were just too enormous to fit in the regular-sized MRI. Even the bigger MRI was a bit claustrophobic for us, but we made do.

The next stop was the anatomy discussion. Walking around the compound, none of the passing staff could keep their eyes off of us. And we both loved the attention. We were naked, muscular and proud. We couldn't get enough of each other. We were basically holding hands, putting our arms around each other's shoulders and waists, fondling each other's butts, caressing each other's muscles, oooohhhh...it was so sexy! Our boners just didn't have any breaks. I love my wife! She's my absolute dream girl.

When we stepped into the anatomy room, Dr Steiner was already there with a team of almost 20 scientists. Sienna and I were asked to stand on a platform at the centre of the room for all to behold. Both of us were over 430 pounds in body weight, most of it made up of pure muscle. So when we stepped onto the platform, our powerfully-built legs and bare feet were thumping like thunder with every stomp. And my word, did their jaws drop. They had never seen a muscle specimen more amazing and beautiful than ours. Our muscle development was unprecedented. And they were excited to study us.

"Ladies and gentlemen, my fellow colleagues," Dr Steiner began, "this is Jonathan and Sienna Cox, our first two subjects for today. They are husband and wife, and my, my, will we ever see a more compatible couple ever again? As you can see, they have been dubbed as the two most muscular human beings in history, and today, we shall study their muscle composition. Feel free to consult your anatomy charts and feel the specimens. They have given their permissions to do so."

We spent the entire session flexing and posing for the scientists, them identifying the muscles in our bodies based on their anatomy charts.

"Tensor fascia lata."

And we both showed off that beautiful muscle of ours.

"Serratus anterior."

And we twisted into a side crunch, our serratus just blooming with power and definition.

But then again, most of the scientists flocked to feel and gape at Sienna up close, compared to me, maybe because she was pretty...and she was much bigger, much denser and much more ripped than me. Standing side-by-side on the platform, her superiority was obvious for all to see. It was evident in the Olympia yesterday, it was evident here as well. But I didn't mind. She was my wife, and I love her. And it was her superiority that granted me my deepest fantasies.

"Impressive. You're a girl, but your muscular development has exceeded those capable in any male bodybuilder, let alone females. Tell me how did you do it?" One of the female scientists asked.

"Lots of brutal workouts, SUPER heavy-ass weight-lifting, lots of eating, lots of protein, lots of meat, and of course, some out-of-this-world genetics...but that's for you to find out," Sienna said, going into a front double bicep.

"Fascinating!"

"Simply marvellous!"

"I didn't know such muscular development is even possible for a human being!"

Sienna grinned cockily. "Well, I'm not just any human being. I am literally a superhuman!" And she went into a javelin pose that fortified her ultimate superiority.

Because of how shredded and cut we were, the scientists had little trouble differentiating our muscles. Our muscles were so well-defined and separated, we were no doubt in much better shape than their anatomy charts. But when it came to our backs, fuck...the scientists were in a conundrum. The muscular development was beyond amazing. Every muscle fibre, every cut, every groove, every bulge, every vein...all of it was sculpted like a masterpiece to perfection. And then there were the undiscovered muscles that we managed to build. Such was the level of our conditioning. We were so shredded to the core, muscles that were unseen in a regular human body even started growing in ours. The scientists managed to identify 3 pairs of undiscovered muscle on my back, while Sienna had 4 more pairs (total 7 pairs). They need to discuss how to name these muscles, but they would revolve around our names. Imagine, jonius major or rectus siennus. Our muscles will be immortalised.

Before we ended, we were asked to pose for pictures, all to be used in the latest standard issue anatomy charts and textbooks. What better specimen is there besides both of us? The first shot was a relaxed shot, and even then, we were absolutely glorious. Every muscle, well-sculpted and defined, each fibre where they should be. Some bodybuilders had to flex just to achieve our level of conditioning and size when we were relaxed. Then we were asked to strike a series of compulsory poses, and that was our favourite part. Sienna and I just loved flexing, she probably more than me. And she ought to be. She was obviously bigger than me and better conditioned, and had much better posing techniques. It was a waste if she didn't use every opportunity to show off her gorgeously ripped body and every inch of her hard, dense muscles. Just like the Olympia yesterday, standing side-by-side, she just outshone and outmuscled me in every pose. She even tried out her very own modified front double bicep which had gone down in history as one of the most legendary poses: The Sienna Double Bicep. She started off with quad stomp, resulting in the blooming of her titanic thigh muscles, before crunching her abs and folding her arms behind her head for an abdominals pose, the bone-crushing ferocity of her shredded eight-pack bursting to life, all the while liberating her thickened lats with the raising of her arms, showing off the twisting knots of the muscle insertions at her cleanly-shaved axillae. From here, with the quads, abs and lats in a fully-flexed display, she unfolded her arms, opening them out laterally, hands scrunched up in a crushing fist (I could hear her knuckles cracking), before bringing them up dynamically into the classic front double bicep, her chest puffed out to show off those dense slabs of hardened meat she called pecs.

The onlooking scientists all gaped in awe as she stood there, emitting an aura of magnificence from the grandiosity of her pose. Compared to my regular front double bicep, she already had the mass, she already had the definition, she already had the vascularity, now combine that with the fact that she was flexing almost every single muscle at the same time, it was mesmerising. Because her biceps were already glorious, flexing her abs, lats, pecs, and thighs didn't take away the attention from the bicep, but rather, enhanced the invincibility of her full body musculature. Every single muscle, flexed to full strength, exploding with power. And that smile, that gorgeous smile...

She tried to teach me the Sienna double biceps. But it was too hard for me. Each step required so much power, so much muscle control, so much focus. For her, despite there being too many steps, too much muscle control, she did it as if it was second nature, every transition a graceful, harmonious dance, a testament to all the hours upon hours she spent posing in front of mirrors. She posed when she woke in the morning, she posed in the shower, she posed after each workout set, she posed whenever she passed by any mirror whether it was in private or in public...it was a part of her. And to think she barely knew anything about bodybuilding almost a year ago. The only posing she did were for swimsuit and fashion photoshoots, showing off her slim, toned curves and symmetrical facial features. Now, she had mastered a different type of posing: bodybuilder posing, displaying the enormous, ripped muscles she had obsessively built in the past year, on top of those feminine curves and gorgeous facial features. She had transformed herself from a sweet, graceful princess into a beautiful, hulking, "Sienna-esque" muscular monstrosity. Monstrosity was the correct word, despite her looks being so gorgeous, because of how MONSTROUSLY huge she was. Every inch of her delicate frame, she had packed with pound after pound after pound of pure, rock-hard, muscle.

The people reading those new anatomy charts and new textbooks would have a field day with this physique of hers. It would be a historic picture too. Because it was undoubtedly obvious that Sienna was much bigger than I was. People would notice that, and feminists would use her as an example of raw feminine power, that even ladies could outbuild their bodies to be bigger than a man if they put their minds to it, both in the muscle and cock department. Although...the authors might need to explain why a beautiful girl like her was sporting a beefy, thick cock.

The next session for us was the session that we couldn't wait for. The reproductive session. Clearly, we both had reproductive organs that were not normal for an ordinary human being. Me, with my massive penis (too massive for an average man) and Sienna's futa state. Both of us were producing INSANE amounts of cum so they wanted to know why as well.

Our job was to just masturbate. Not into a cup like you see in hospitals, but into a big fucking bucket! It was a special bucket, not the type you see milking cows. Probably just as big, but these buckets had measuring scales printed on the sides to mark our cum volume. Sexy. Also, the bottom of these buckets had a pressure sensor built into it. So it could measure our first ejaculation pressure, adjusting for height and gravity of course.

I went first. The room had a couple of porn magazines, but I knew that was not enough. When you had sex with my wife, nothing else would satisfy you any more. Thus, I demanded for my wife. If I wanted to cum, I needed my wife to arouse me. And only her.

Sienna, of course, was honoured. She gladly obliged. All she had to do was to do a pec bounce, and I just exploded like a fire hose straight into the bucket, literally, in both pressure and volume. But this research required me to unload ALL of my cum. So my wife continued to turn up the intensity. She flexed her biceps. I worshipped them. Then she slapped her big dick against my face. I took it in, suckling her cock like a popsicle. I rubbed my penis even harder. My cum was just spraying.

"Oh fuck babe. Mmmmm....ohhhh....mmmm....slurppp..." I mumbled. "You're just too amazing..."

"Mmm you like that don't you, my love?" She flexed her bone-crushing, world famous eight-packs. "Kiss my abs. Show my girls your deepest love..."

I obeyed, planting my lips on each brick of abs that she owned, and they WERE like literal bricks...only smoother, my tongue tracing the network of sexy veins running over her midsection. Pretty soon, the whole bucket was almost full, so I slid over to the next one.

"Come, love, let me help you with that," Sienna grabbed my penis, "You just worship my WHOLE body."

I caressed all over her. Her arm, rubbing my penis, was a fucking MACHINE! The moment she grabbed my shaft, the power in her grip just sent shivers down my spine. But I didn't mind. In fact, I loved it. And she just started rubbing. Oh my God! She was lighting fast, her push and pulls so fucking strong...Her movements reminded me of the hydraulics in a racecar engine...moving at 7000-10000 rpm. Oh shit! It was the greatest feeling of my life. And those arms of hers....fuck! They were exploding!

I focused all my worshipping power on her rocket-launcher of an arm. Knowing that I was feeling up her forearms and biceps, she went even faster and harder! Flexing and unflexing with each movement.

"MORE!" She screamed.

"MORE!" I echoed.

"FUCK! CHECK OUT MY ARMS! Now you know why I built them!" She flexed her left bicep, and I just smothered it, as she rubbed my penis with her right, "I built them for this very moment! I built them for you!"

"Sssssss.....OOOOOOOHHHH....MMMMMMMMMMM." I groaned hungrily.

"HUUUURRRRR!!!! ARRRRRRGGGGHHH!!!" Sienna screamed, threatening to rip off my cock with her ferociously aggressive masturbation.

And I unloaded like never I unloaded before. If I were to ejaculate into a normal woman, I think her entire stomach would explode!

Eventually, I managed to fill up both buckets...a full 10 gallons, much more than how much milk a cow could produce in a day (Google says 8 gallons). Of course, we looked very intimidating standing next to a cow. A cow looked tiny next to us, we could literally pick them up over our shoulders. We did that before, during our trip to New Zealand. It was easy. Sienna slung one cow each over her shoulders like they were sacks of grain. They were full grown cows but they looked so small compared to her massive size. We took a picture of that pose. The picture got into the local paper. People called her the "Monster Cowgirl". She liked it.

After an assistant picked up the two buckets of my semen to the lab, it was Sienna's turn to masturbate.

"Babe, please stay. Porn magazines don't work for me too. I need you..." Sienna said in a clingy tone, holding my hand.

"Of course, my love."

A mischievous smile spread across her face. "Flex for me."

I did. A thigh and abdominals pose. She hugged me, rubbing her dick over mine, as well as my washboard abs. She loved it when our cocks rubbed against each other. Me too. It was so sexy, especially when that cock belonged to a girl!

"It's coming! It's coming! AHHHHHHH."

And she unloaded straight into the bucket. If I was a fire hose, she was a fucking volcano! She was THAT potent. Gosh, not only was she the epitome of the ultimate woman, she was the epitome of the ultimate MAN as well! She was a symbol of flawless virility. Her unrelenting potency, her massive dick, her overwhelming strength, her unfaltering confidence, her alpha nature in the relationship, and her unparalleled muscularity. Just emasculating! And I love it!

Eventually, she made me grab her cock and rub her dick for her. My gosh! It was huge...and hard! Comparing with my dick, hers was about half an inch longer, and had much more girth, and it was quite obvious. Shit...and looking at the rate she was unloading! She could get a whole town pregnant!

Eventually she managed to fill up 4 pails (double mine!) or 20 gallons with her cum. Oh my God! All that juicy, delicious cum! Two assistants were needed to move the buckets, and looking at the liquid, it was thick and creamy, a bit like the buckets of curdled milk used to make cheese. Oohh...how I would love to taste all that cum of hers.

Barbara wanted to bring us to our next stop, but we insisted on staying. I think we still had a bit more stamina to go on, and a bit more cum to unload into each other's favourite holes.

[Apley44]

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[Wookey]

Unbelievable.  Best story I have read from you.

[Elmanouche]

A really hot story indeed!

[Thrakhath]

Very good and very hot story! And it seems that Sienna not only can be a mother, but she can be a father too! 😉🤓

[monstarmaster]

We need a new installment soon. This story is epic!

[Apley44]

Chapter 15

By the end of the day, Sienna and I were lustfully cuddling each other's naked bodies in the waiting room, as Dr Steiner said he would debrief us on the findings. Sienna and I just had the most exhilarating workout in the lab's state-of-the-art gym. Before we went in, they made us flex for some maximum measurements, Sienna especially, proudly obliging. Nothing turned her on more than a flex-and-measureme session. I could see the scientists gaping when she stepped on the heavy-duty weighing scale, the digits going haywire initially as it took in Sienna's outrageous bodyweight before settling on a value. Then, a couple of female scientists brought out their tape measures and noted down her essential measurements. When it came to the bicep, I noticed Sienna acting mischievous.

"So, Sienna, let's see those big biceps of yours!" one of the scientists said.

"You mean...THESE BICEPS? Tee-hee," Sienna playfully giggled, bringing up the most monstrous right arm the world had ever seen, pencil-thick veins popping, striations rumbling, with a beautiful, well-defined cut running along the peak to separate the individual heads of her biceps brachii. I noticed the two female scientists shuddering, the ecstasy of the muscle show turning their cheeks a bright tomato-red. They composed themselves and wrapped the tape snugly around Sienna's arm.

"30 inches! Oh my god, when Kai Greene and Big Ramy came, we measured their arms at 22 inches and 25 inches respectively. At 30 inches, your arms must be the biggest in the world! Girl, your arms are bigger than my waist and thighs!"

"Hmm...now, 30 inches, that isn't right, is it, my love?" Sienna asked me coyly.

I furrowed my brows. Two other female scientists were also doing my measurements, their eyes locked onto my giant erect penis. "Doesn't seem right...I think."

"Of course it's not right. Silly me. That's because I wasn't flexing." Then her face twisted into a sinister smirk. "Now, THIS is flexing!"

And just like that, she tightened her fist and suddenly, her right bicep just exploded with sheer power and size! Outrageous size, size that so ever easily snapped the scientists' tape measure in half, her previously pencil-thick veins bursting into finger-thick veins, the striations evolving into deeper crevices that further defined her densely built muscle fibres. I remember a scream from one of the scientists, and my dick fired a shot of cum right into the wall almost 7 feet away, just by watching my sexy wife displaying her formidable dominance. The female scientists that were measuring me had witnessed Sienna's little show, and had to quickly excuse themselves to the bathroom, their expressions flustered, while I noticed streams of white fluid oozing down their thighs, probably from their soaking wet panties.

Eventually a new tape measure was brought in for Sienna and the final measurements were verified.

Sienna's measurements:
Weight: 403 pounds
Height: 6 foot 9
Chest: 76 inches
Waist: 32 inches
Arms: 36 inches
Thighs: 47 inches
Calves: 36 inches
Penis/clit length: 12.5 inches

Jon's measurements:
Weight: 392 pounds
Height: 6 foot 7
Chest: 74 inches
Waist: 33 inches
Arms: 34.5 inches
Thighs: 45.5 inches
Calves: 35 inches
Penis length: 11.5 inches

That was before the workout. Then, electrodes were plastered all over our bodies, especially over our major muscles, and the scientists gave us the freedom to workout all over the gym. It was so much fun, prancing around naked, grunting, torturing ourselves with Spartan intensity. Well, it was SLIGHTLY emasculating, to see Sienna outlift me on every exercise, especially in front of an audience of scientists, but at the same time, I was glad this emasculating goddess was my own wife. Her 1800-pound squats vs my 1700 pounds, 15 full reps, 4 sets (and then the barbell broke). Her world-record (unequipped) 1300-pound bench press vs my 1200 pounds, 12 reps, 4 sets. Her 800-pound barbell rows vs my 700 pounds, 20 reps, 4 sets. Her 350-pound dumbbell bicep curls vs my 240 pounds, 20 reps, 4 sets. In almost every exercise, she outlifted me by almost 100 pounds, and it was obvious as I had to slide off quite a number of plates after her sets, and she had to restack them when it was her turn. All the while, the electrodes on our bodies recording those insane physiological measurements of our pumped-up muscles.

The end of the day was marked by a psychotic weightlifting session of the company's Jeep series, the heaviest apparatus in the lab, all parked side-by-side. If we could lift those, it would have been a convincing statement of intent, that my wife and I were the world's strongest human beings. 

The following were the Jeeps parked in front of us:
Jeep Wrangler Sport: 3,970 pounds
Jeep Wrangler Unlimited Sport: 4,201 pounds
Jeep Wrangler Unlimited Moab: 4,345 pounds
Jeep Wrangler Unlimited Rubicon: 4,439 pounds

"Does every bodybuilder that gets experimented on need to lift those?"

Barbara, Dr Steiner's assistant, who was ushering us, answered, "We do ask them to give it a try. So far, our record holder was strongman champion Hathor Hafdorson, and he managed to deadlift the back of the Jeep Wrangler Sport."

Sienna chuckled. "Hmm...just the back...for a strongman champion? It's the lightest jeep here."

Barbara smiled. "Well, I'm sure Mr and Mrs Cox, you can certainly do better."

Sienna flicked her hair back, before going into a most muscular pose in front of a mirror. "OOOOHHHH YEAH. These muscles aren't just for show. But of course, my love, why don't you go first?"

I made my way up to the heaviest jeep – the Rubicon. It was best to start with the heaviest, and not waste my energy with the lightest. I placed both hands underneath the back bumper, and with a loud scream, snatched it up to my chin. Holding it there, I could feel the blood boiling in my head as I took a few deep puffs of air into my lungs, before pushing it over my head. Now one half of the jeep was lifted. The next step, I had to duck underneath it to reach for the front and lift that part too. Still, I found it hard to move. I was stuck in my current position, the weight of the back of the jeep too heavy and I was struggling to hold it. Eventually, I felt myself getting tired, and not wanting to get killed, I let go. The Rubicon defeated me.

"C'mon babe! You can do it!"

I gave myself 10 minutes to catch my breath and moved on to the second heaviest jeep – the Moab. Using the same technique, I lifted the back, which was much easier. Now the hard part, ducking under to reach the front. I composed myself, and then swiftly, supporting the jeep with my left arm and massive back, sidestepped underneath the jeep, and got a good grip of the front bumper. Then, with one powerful scream, I propelled my legs upward, then straightened my back and then my arms, the incredible weight of the 4345-pound Moab displayed over my head, like a glorious iron trophy of my very own Strongman contest.

"AAAAARRRRRRRGHHHHHH!!!"

Sienna jumped joyfully. "Yay! My hero!" And then, the next thing I knew, her naked body was pouncing towards mine, my big erect dick engulfed by her muscular vagina, and for 20 minutes and like the second time today, we fucked each other crazy. Her giant cock was pressed up against my abs, and I could feel her pleasure as she rubbed against those washboard bumps of mine, while I shot almost a gallon of cum straight into her womb. We didn't even care if there were like almost 20 people watching. "What a stud...so STRONG and RIPPED! Fuck me harder babe! FUCK ME! Show me your biceps, oh yeah, that's it, BIG HUGE BICEPS...argh...do a pec bounce for me...mmm...good boy! Oh babe, I'm cumming, I'm cumming...arrrgghhhh!"

And I felt her vaginal juice just oozing out of her orifice, slopping over my cock stuffed inside her, before trickling down her veiny, ripped, muscular thighs. Then came her cock, the big fire hydrant of hers just gushing out pint after pint after pint of thick, creamy, delicious cum like a mall fountain. It was like raining Sienna juice!

When we were done licking all that cum off our bodies, it was Sienna's turn. "Babe, do you want me to show you how it's done?" she said, caressing my chin.

"Please, babe. There is nothing that turns me on more than you, putting me in my place," I said.

"Aww...babe..." she pressed her lips against mine, her tongue rolling over mine. "These are what these HUGE muscles are for," she said, showing me that bowling ball-sized bicep of hers, which I kissed passionate. "Oh my love, you spoil me."

Confidently, she strutted over to the Rubicon, a jeep I was unable to lift, and just standing next to it, her enormous size just dwarfed the vehicle. It was like Ronnie Coleman, standing next to a Mini Cooper or Disney's Mr Incredible with that little blue car of his . Then, with one smooth motion, she lifted the back part of the jeep over her head. No pauses, nothing. Just one clean jerk. Then, balancing the back with her left arm, she slid her body under the jeep and with her right hand over the front bumper, she just propelled the 2-tonne (4439-pound) Rubicon over her head, her confident laughs emanating across the room. If that wasn't enough, she did 10 reps of squats with that immense weight over her head, plus another 10 reps of INSANE shoulder presses.

"Barbara, do you have another Rubicon on standby?" she asked.

"Yes, why do you ask?"

"Because...I wanna DESTROY this one." And then, out of nowhere, Sienna just smashed the Rubicon against the floor. Like a piece of cardboard, she tore the hood off and ripped out the entire engine with her bare hands. Then, off came the doors, torn apart as easily as the hood, then it was the wheels, twisted out of the axles and then the rubber tyres just pulled apart like donuts. From afar, she looked like a female version of the Incredible Hulk just going psychotic over the helpless vehicle, her muscles, veins and sinews just straight up exploding. Sienna was literally tearing the jeep apart with her bare hands. And it seemed not much trouble for her as well. Forcing the roof off took a bit of time, but she did it eventually and then it was the seats, coming off as easily as if they were stuck by a child's Lego. Last but not least, she grabbed the jeep by the rear bumper again and with a tight spin, hurled the jeep across the room, crashing it against the wall before it exploded into a giant ball of flames. With the explosion behind her, she just rested one hand on her hip, and the other in a bicep flex, flicking her silky blonde hair nonchalantly as if destroying an entire jeep with her bare hands was just something she would do in her free time.

I was gaping this whole time. As she approached me, I couldn't help but to feel both turned on and intimidated by what I just saw. When she strutted her way towards me, her massive shadow blotted out the lights in front of me, her incredibly muscular body looking as humungous as ever, her muscles just exploding from the monstrous workout she just had, the sweat glistening over her gorgeous skin making her all the sexier.

"Whoa, that felt...so good! What a great stress-reliever! I'll pay for the jeep," she wrapped her powerful, metal-crushing arms around me, and pulled me in for a tender kiss. "What do you think, my love?"

"You are AMAZING! Terrifying, but amazing!" I said.

"Aww...you don't have to feel terrified of me, babe. If anything, you should feel proud. If anyone dares to harm you, I will destroy them just like how I destroyed that jeep! I will protect you forever. Come, show me a front double bicep!" she said.

I strolled over to the mirror and did as I was told. Still a very impressive pose that I was sporting. She may be the world's most muscular human being, but I was still the world's most muscular man. However, my monologue of self-pride was quashed once again as Sienna stepped directly behind me, and struck a front double bicep of her own, her ultra-ripped, ultra-gigantic figure just straight up dwarfing mine. She was just bigger, taller, wider, thicker, tougher, and stronger in every conceivable way. There was no greater proof and demonstration of just how much more superior she was compared to me.

The last part of the session was a post-workout measurement of our bodies, just to see how much our muscles had grown after each workout. The numbers, especially Sienna's, were insane. 

Sienna's post-workout measurements:
Height: 6 foot 10
Chest: 78 inches
Waist: 32 inches
Arms: 38.5 inches
Thighs: 49 inches
Calves: 38 inches
Penis/clit length: 12.5 inches

Jon's post-workout measurements:
Height: 6 foot 8
Chest: 75 inches
Waist: 34 inches
Arms: 35.5 inches
Thighs: 46.5 inches
Calves: 36 inches
Penis length: 11.5 inches

"Check out these numbers! I am HUGE! URRRGGGGHHH!" Sienna said proudly, hands clasped in front of her in a variation of the most muscular, all the while tightening her rippling torso, admiring her incredible muscularity in the mirror, the full-blown power of her delts, traps, arms, pecs and abs on majestic display. "OHHHH FUCK YEAH! Someone get us a room! I am SOOO turned on right now! I need to fuck my husband!"

And thus, it brings us back to the waiting room, the cuddling of each other's naked, sweaty bodies, her wrapping her thunderous thighs over my waist and me worshipping every inch of her powerful body. By evening, Dana Olsen, Yasmin Kim, and Polina Remkova joined us after their own experimental sessions and seeing how sexy of a position we were in, joined in for a lustful orgy of the top 5 most muscular human beings in the world. It all cumulated in the dominance of our queen goddess, Sienna, for by the time we were done, she was in this majestic, central, sex-queen position: me penetrating her anus with my 11.5 inch dick; Sienna's giant 12.5 inch cock fucking Dana's vagina in an Aquaman's Delight position, Dana straddling her ripped, beefy legs over Sienna's gorgeously chiselled core; all the while, Sienna reaching underneath Yasmin's muscular butt with her right hand, and doing the same to Polina with her left, and like bicep curls, lifting their massive bodies off the ground so that she could suck their pussies, alternating between the pretty K-pop faced goddess and bear-killing Russian queen.

Just as we were done, and it was a full 2 hours, Dr Steiner came in with our reports.

[Wookey]

K+ this story is so hawt. Well done again

[monstarmaster]

Great continuation! Well done! Sienna crushed the jeep for good!

[jhunter]

Intereting. Wondering where all this research will lead to. Keep up the nice work.

[Apley44]

Chapter 16

"Whoa, whoa, whoa, what happened here?" Dr Steiner asked, inspecting the cum-laden room. The smell was also intoxicating, the whiff of our pheromones hanging in the air, mixed with the aggressive sexual musk of our sweaty bodies and the odour of fresh, warm love juice. Nearly half of that juice was Sienna's, and to rehydrate herself, she was guzzling down a 4L bottle of water, before throwing the emptied out container across the room and striking a terrifying most muscular in the mirror, veins and striations around her neck, chest and shoulders blooming with power, a showcase of just how sexually powerful she was with that ultimate physique of hers.

"Oh fuck yeah! I am RIPPED. With muscles as ripped as these, who else can resist me?! I could dominate any human being in this world, sexually and physically! Urrrrghhhh! Oh yeah!" she bragged.

It was true. Sienna had just fucked us into oblivion. Me, Dana, Yasmin and Polina. The top 5 most muscular human beings in history! Even Silverback gorillas were afraid of us. But we had just been handed a mind-blowing sexual experience by Sienna. Never again will any other human being pleasure us in this way again.

Not long after, we flanked her and went into muscular poses of our own. I did a side tricep, and then moved in for a crab pose similar to that of my wife. Seeing the sheer superiority in size and conditioning she had over me, she chuckled, before picking my massive body up in a bridal carry, as effortlessly as lifting a pillow, showering me with a flurry of kisses. It was emasculating, but it made my dick hard. I used to do that to her, back when she was a slim, toned beachwear supermodel. I was the alpha stud, muscles aplenty. Now our roles were reversed, she was clearly the alpha, and she had no problems showing it, but regardless, I enjoyed this dynamic shift. She was still the caring, loving queen that I married, only now, she had a set of incredibly-built muscles that could destroy me in less than a minute with her bare hands. She then plopped down on a couch, the cushion sinking deeply with the sheer magnitude of her 400-pound musclebound bodyweight, cradling me in her arms and I never felt safer in her strong embrace. Even unflexed, the insane bulges of her biceps were prominently protruding from her arms, like a bowling-ball stuffed underneath her silky beige skin. She crossed her legs, displaying a beefy, vascular set of melon-sized, diamond-cut, inverted tear-shaped calves, the individual separations of the gastrocnemius heads well-defined by the shadowy grooves in her hard flesh; ankle bracelets jiggled in the air, her beautifully pedicured toes glistening in the lights. She had a contract with Jimmy Choo for leg and feet modelling less than two years ago, and now, those pretty, soft legs, while retaining their beauty, was moulded into a shredded collection of muscles and engorged veins, to the point they could smash concrete and crush bowling balls.

As the other three female bodybuilders cuddled up around us (or mainly, her), Dr Steiner got the projector ready and cleared his throat, preparing for his scientific presentation.

"So, ladies and gentleman, we have seen some OUTSTANDING, OTHERWORLDLY feats from you all today. Sienna here has lifted and destroyed a 4500-pound jeep with her bare hands," as he said this, Sienna flexed a gigantic right bicep for all to see, Dana and I scrambling to kiss it.

Dr Steiner continued. "While the rest of you managed to lift a Jeep Wrangler Moab over your heads with relative ease! You all are literally the strongest human beings who ever lived!

"Which brings me to my point. We have conducted research in over 100 bodybuilders over the years, including you, and from your results today, we have came to a groundbreaking conclusion. The five of you are the next step in human evolution. Through a series of DNA tests and genetic studies, we have found your genetic makeup to be more superior than that of any human being.

"The main difference lies in your chromosome X. There is a mutation in the chromosome, giving rise to the Dominus gene. What is this Dominus gene you ask? It was discovered by us today, and it is responsible for coding a mutated but more potent form of testosterone, called Neotestosterone. 3 times more potent than regular testosterone, giving you unparalleled muscular development, prolonged stamina and enhanced libido. The best thing about this Neotestosterone is that you can reap its muscle building effects, without ANY risk of virilization towards women. Normal testosterone would cause an increase in male characteristics among females like a deepened voice, increased facial hair and acne, but with Neotestosterone, you will experience none of these effects. You even get to keep your boobs! And the best thing is, for all five of you, your bloodstream is FULL of Neotestosterone. Simply off the charts! And with that, you are able to build muscle mass much more rapidly and aggressively than any normal human being. Not only that, you have better proportions, increased growth, increased fat metabolism, increased digestion rates, increased seed production, prolonged youth, God-like beauty features (which explains why you all look like supermodels) and longevity as well. Your cell regeneration capabilities are out of this world, and you might live to be 200, and even more! Which means...you can hardly age. We predict that by the time you reach 80, you will still have the same beauty, youth and physicality as when you were 30! This is simply just INCREDIBLE! Do you know the amount of breakthroughs we can use for this?! For science!

"And thus, with all these changes, we believe you are no longer classified as normal human beings, termed scientifically as Homo sapiens sapiens. You are a completely new breed or subspecies and from now on, you will be known as Homo sapiens dominus! Dominus for dominant, for we believe you will be the dominant species from now on. You like that right, dominance?"

Sienna chuckled and smirked. "Oh Dr Steiner, we LOVE dominance!"

"But I do have a question, Dr Steiner. Why didn't we manifest this earlier in our lives? Like Sienna was only as huge and ripped as she is now, only a year ago," I asked.

"Good question Jonathan. This Dominus gene can only be switched on through INTENSE physical workout. Keyword: intense. If you train hard enough in the gym, you can switch on that gene, and from there, there is no switching it off. You can only get bigger. More muscular. And stronger, as the mitochondrial count in your muscle cells are 10 times that of a normal human.  Sienna had only started her brutal workout with Dana one year ago, and I believe that set it off. Same goes to the rest of you, going back to the point of time you all started bodybuilding and killing yourselves at the gym. Which is why we think there may be more Dominus humans in the world, just that not many of them work out hard enough to switch it on. And because the gene is found in X chromosomes, and females have two of them (XX), we believe it is more common in females. Guys, not so much, because they only have one X chromosome (XY), so the probability of them having this gene is reduced. So once we advocate for intense physical workouts among the public, especially girls, expect more hulked up ladies just like yourselves to pop up in your bodybuilding contests."

"And Dr Steiner, what about my HUGE cock?" Sienna asked. "I don't see Dana, Yasmin or Polina having one."

"Good question. After doing the MRI, we found you, Sienna, to have both female and male sexual characteristics. While it is not hanging out now like normal men, you actually have two tangerine sized testes located in your pelvis, on either side of your uterus. They are HUGE and EXTREMELY POTENT. Which is why your cock is squirting out almost 20 gallons of cum every time you have sex. This is because you have a second mutation that no-one else here has, a mutation in chromosome 13, the Siennus gene, giving you male genitals in addition to your female ones. Very interesting. It was also switched on at the same time as your Dominus gene."

"Ooohhhh, soooo interesting!" Sienna said, stroking her beautiful giant cock known as Boudicca. "Now that we are done here, why don't we have some serious sex back at my place...hmm? I feel so 'dominus' right now..."

———————————————————————————————————————————————————————————-

Once the bodybuilders were gone, Dr Steiner quickly packed his briefcase, and rushed out of the lab and into the Nevada desert. Around 20 miles west, was a strip club by the name of "Desert Foxes". Despite being in the middle of nowhere, it was pretty popular among the local men and strip club enthusiasts, who would pay big bucks just to have a taste of the girls on show. It was jointly opened by himself and his niece, Cassie Steiner, whom he had raised since she was 12. She was around 25 now, and despite his many objections, she LOVED her job as a strip model. Nothing got her going like the desire of men. And just to add to that, she was actually an NPC Wellness competitor by day, those toned abs and beefy, muscular legs winning her second place in the NPC North American championship. As Dr Steiner entered, Cassie was doing a routine with a pole, her bright yellow microkini half-undone, showing off a fully rounded pair of glutes, with firmly-built quads and hamstrings, before tapering nicely into her knees, and then blooming again into a seductive calf. Her dirty blonde hair flowed down to her mid-abdomen, with a pair of piercing hazel eyes. Like all Wellness competitors, she was gorgeous, Latina gorgeous, getting those beautiful Brazilian genes from her former Miss Sao Paulo mother, mixing that with her Austrian-American genes from her paternal side. Cassie was stroking a gruff trucker's chin with her soft, sexy feet, before letting him suck on those perfect pearly-painted toes of hers. She was on stage with the other models, childhood friends that had taken up her offer to be an angel of lust, but they were more or less bikini models rather than an athletic Wellness bodybuilder like her. Because of her more muscular features, at 5 foot 8 with capped shoulders, striking abs, and buffed-up legs, Cassie was the most popular stripper in the joint. But she had always wanted to up her game.

Dr Steiner made an acknowledging eye contact with Cassie, before heading to a rather shady, camouflaged door in the corner, and trotted downstairs to the basement. The next door was made of 1-inch thick steel, and protected with biometric security. After a retina scan, the door opened and he welcomed himself into his private, underground lab. Despite the strip club being as big as a regular house, this lab spanned much wider underground, almost the size of a warehouse. Animal cages were found in one end of the lab, which he would come down to feed twice a day. In the centre of the room, was a super computer and next to it were four cryochambers, about the size of refrigerators, like the ones you see transform Steve Rogers in the Marvel Captain America movie. There was a small rounded glass window on the hatch of each chamber for people to see the face, and at the moment, the chambers were empty.

Dr Steiner spent the next two hours on the supercomputer, setting up using the findings he got earlier from the experimentation on Sienna and co. By midnight, the music from the strip club upstairs had faded, and for the last time for the next 11 months, the girls locked up for the night. Eventually the four strip models headed down to the lab and each gave Dr Steiner a kiss on the cheek.

Cassie was there, and the other three girls were Kayla, Gabrielle and Sakura, all of them in their mid-20s. Kayla was one of the most gorgeous African-American women Dr Steiner had ever seen, with high cheekbones and unique azure blue eyes, and in her bikini, she looked geared for a Victoria's Secret photoshoot, her soft, ebony skin glistening in the ceiling lights. Gabrielle was from Miami, and because of that, her beautifully tanned skin seemed to complement her silky chestnut hair, hair that used to be on the labels of L'Oréal shampoos three years ago. Sakura, Japanese-American, grew up as a figure skater, and her flexible body and snow-white skin made her an important asset for stripping at this joint. Despite racial stereotypes, she had boobs that would make Sofia Vergara green with envy, and the best part was, it was all natural.

"Uncle David, I got your email, and it was definitely GREAT news, I can't wait! Literally, I had been waiting eight years for this breakthrough!" Cassie said.

"Anything for you, dear. Now, just to run through the email, in case you haven't read it, we have discovered the Dominus gene on the X chromosome, and the Siennus gene on Chromosome 13. The Dominus gene is what makes you super ripped, super strong and basically immortal. The Siennus gene gives you that giant cock that Sienna Cox is showing off. Now, are you ready to forgo being Homo sapiens sapiens, and become, Homo sapiens dominus?"

"Yes! Yes! A thousand times yes! I have trained since I was 10, to achieve my dream of becoming the most muscular human being in this entire world! But no matter how hard I trained or dieted, this is the peak my genetics would allow me. Wellness. With this new breakthrough, I will have the genetic perfection to achieve my lifelong dream of being the most muscular bodybuilder in the world. Are you with me girls?" Cassie asked.

The other three girls nodded in unison.

"And plus, who doesn't want a huge fucking dick to humiliate men with!" Cassie laughed.

"Oh, about that Cassie," Kayla interjected, "the girls and I think we are skipping the dick part. We just want the muscles."

"Oh okay, suit yourselves," Cassie shrugged.

"But we would DEFINITELY enjoy having your BIG, HARD COCK inside our STRONG, MUSCULAR PUSSIES..." Sakura said.

Cassie chuckled coyly. "Mmm...girls...you flatter me."

"Now that we are ready girls, please, step inside your respective cryochambers," Dr Steiner ushered.

The cryochambers, each the size of refrigerators and as wide as doorframes, were special machines invented by Dr Steiner, containing targeted gamma radiation that would modify specific parts of chromosomes to get the desired genetic sequences. Today, he was going to modify all four of these girls' X chromosomes to obtain the desired Dominus gene, turning them into muscular monstrosities they so deeply aspired to be. With Cassie's chamber, he would also program it to modify her Chromosome 13 to obtain the Siennus gene, giving her two outrageously potent tangerine-sized testicles in her womb, with a giant stallion-shaming cock to call her own. Uniquely, he also added an electrical beam inside each chamber, which upon activation of the Dominus gene, would "shock" the muscles into overdrive (similar to intense physical workouts), stimulating the girls' muscles to violently grow in size without having to train them up. And with multiple IV cannulas inserted into their veins, perfectly calculated nutrients would be infused into their bodies based on their nutritional requirements, and in a span of 11 months, just before the next Olympia, they would emerge as perfectly built specimens of muscular beauty.

The girls all stripped naked, giving each other final embraces and kisses before reemerging 11 months later as goddesses. Confidently and calmly, they each stepped into their cryochambers as if they had done this a thousand times before, and they didn't even flinch when multiple, scary-looking robotic needles penetrated their skin: some were electrodes, some were IV cannulas for nutrients, some were supplements. Finally, they closed their eyes and the hatch to each chamber closed off, their gorgeous, calm faces visible through the circular glass. With that, Dr Steiner keyed in a few codes on his keyboard, and with one reassuring breath, pushed the lever that would set all of this into motion. As the machines roared to life, he could hear the excruciating screams of the girls from inside the chambers, the pain of the evolution just too much to bear, but none of them begged to stop. They were 100% in full commitment of their mission. After about 5 minutes of hellish torment, the screams gradually stopped and the girls were sent into a deep, peaceful slumber.

And for the next 11 months, Dr Steiner came down here to check on them daily, making sure the gamma rays and electric currents were working fine and the nutrients were optimal, relative to their increased growth. The computer showed the girls' vitals, progress as well as a silhouette of their body shape in real-time. Day-in, day-out, Dr Steiner could see their silhouette progress from that of swimwear models, to women figure champions, to women's physique champions, to women's bodybuilding champions, to the Grecian ideals belonging to male Classic physique winners, male Olympian bodybuilders and finally, rival that of Dana Olsen, Jonathan and Sienna Cox. It was also satisfying to see the 2-inch thick, steel walls of their cryochambers get dented outwards and deformed as a result of their hard, muscular growth pushing against the metal.

While all these happened, the world went about their ways. There was a Presidential election, Dr Steiner was up for a Nobel Prize for his discovery, hundreds of women containing the Dominus gene were popping up all over the world (so far no men, besides Jonathan Cox), and the US military had established a platoon recruiting only Dominus women, and had single-handedly brought down terrorist regimes in a span of weeks, wars that regular soldiers failed to end over decades. All this while, Jonathan and Sienna Cox went around flaunting their newfound Olympian victory, going on "breeding tours" around America, tours that enrolled hundreds of rich, young, gorgeous women who were willing to pay millions to get brutally fucked and knocked up by the two most gloriously gigantic cocks in the world, the Coxes' potent seed shooting aggressively into their vaginas, impregnating them with a success rate of 99%, giving birth to a new generation of Dominus girls in the population.

By the last day of the 11th month, Dr Steiner was exhausted. The world was building up to the greatest Olympia in history, as they created a new Dominus category, so far fielding a line of debutante but gorgeously ripped female bodybuilders (and one male, which was Jon). Female bodybuilders who less than a year ago were ordinary stay-at-home moms, college students, and supermodels (because the Dominus gene ensured lifelong beauty, most Dominus girls were considered the top 0.05% most gorgeous ladies in the world, hence a lot of them were models). Anyways, this was the day Dr Steiner ended the experiment, and awaken the four girls to their newfound goddess-like physiques. With that, he pulled the lever and the machine hummed back to silence. Three of the hatches clicked open, releasing a cloud of greyish mist that obscured the chambers' contents. However, on that platform, he could hear the creaks of distorting metal as their humungous bodies tried to break free from the claustrophobic chamber, and emerging from that cloud of smoke, almost in synchrony, were three menacingly powerful right legs – one ebony skinned, one olive tanned, another snow-white – but all equally RIPPED to the core; striations outrageously aplenty; throbbing vessels frighteningly prominent; thick, hard, dense, sinewy muscles abound...GORGEOUSLY abound. Dr Steiner shuddered at this view. The astonishing leg belonging to Kayla wiggled her toes slightly, and Dr Steiner almost ejaculated in his pants, as the individual fibres of every muscle in her calves and thighs rippled with power, and when she planted her bare foot firmly onto the platform, her muscles contracted into a powerful flex. This movement, even if it was barely a twitch, generated so much power, that the air around her leg blew into a gust of wind that broke apart the cloudy mist, thereby exposing the rest of their glorious muscular physiques. Dr Steiner was staring at three gorgeous giants, each sporting a V-taper that would put every single male bodybuilder in history to shame, pecs the thickness of at least two dictionaries and as wide as two beachballs, brick-like eight packs that could crush diamonds between them, biceps the size of bowling balls, delts the size of volleyballs and Himalayan traps that bunched up higher than rugby balls. Even their boobs looked rounder, perkier and firmer, a sign of their unwavering feminity. Synchronously, they made their way down the steps of the platform, and confidently catwalked towards a large mirror on one side of the room. As they went past Dr Steiner, he almost thought he was going to get trampled or beaten up. There was a coldness in the girls' eyes, a piercing, malicious, confident coldness that struck fear into every soul they stared into, if their bodies hadn't already terrified everyone else. Dr Steiner knew, without a shred of doubt, that if they wanted to, these girls could crush his body into a pulp with their bare hands, as easily as crushing a loaf of bread. One punch on his face with just HALF their strength would shatter every single bone in his skull, snap his cervical vertebrae in half and mash his brain up into minced meat; one blow to the gut would shred every single organ from his bowels, to his spleen, to his kidneys, to his liver and the force transmitted would LITERALLY fracture his backbone into a million tiny pieces; a strike to his torso with definitely crush his entire ribcage, smash his heart causing blood to explode like a popping water balloon and squash both his lungs into a pulp. He was totally at their mercy.

In front of the mirror, they showed off their transformed bodies in a posedown, displaying a series of compulsory and modified poses. Their powerful grunts, alternating with sexy orgasmic moans echoed across the room as they admired their blooming muscles and exploding vasculature. Kayla struck a modified most muscular, her hands on her hips, admiring the rippling striations in her massive pecs, the network of veins running along her biceps all the way across her front shoulders, neck and upper chest throbbing with blood.

"Oohhhhh my GOD! FUCKKK YEAHHH!"

Gabrielle's best pose was her abdominals with a concurrently flexed right bicep, grunting as she folded her left arm behind her head and twisted her midsection, checking out the formidable eight-pack she achieved that was decorated with vascularity, flanked by a terrifyingly chiselled set of intercostals, finger-like serratus, shredded obliques and a sexually-arousing Adonis belt.

"HUUUURRRRRR! GRRRRRRRRR! Check out these fucking abs!"

As for Sakura, her ¾ back double bicep was out of this world. Lumps upon lumps upon lumps of dense, knotted muscle, all coming together like the mountain ranges of the Himalayas, only difference was that her back was perfectly symmetrical, with muscularity, thickness and width almost the size of three NFL quarterbacks. Dr Steiner looked at the demon-faced back staring at him, and while Sakura's grunts and orgasmic moans found this demon-faced back satisfying, Dr Steiner couldn't help feeling terrified as if he was staring at the devil's face embedded on Sakura's massive back.

"OH MY GOD! I'M HUGE!" Sakura yelled.

"I'M RIPPED!" Gabrielle added.

"I'M GORGEOUS!" Kayla echoed.

"WE ALL ARE!"

Everyone turned to the voice coming from the platform. The person who said it was still obscured by the smokey grey mist, but everyone recognised that voice from a mile away. Cassie.

There was a loud grunt, and a sound of crushing metal, and from there, the walls of Cassie's chamber flew across the room and embedded themselves into the walls of the lab, like darts on a board, sending cracks along the bricks. In one move, she had literally torn the whole cryochamber apart, with its 2-inch thick walls, welded edges and 1500 pound weight. The bare feet that planted themselves onto the floor of the platform rang like thunder across the room. Her legs were so strong, she could almost shatter the concrete floor, making holes the size of her footprints with every step she took. What emerged from that platform, as the smoke cleared, was something no one had ever seen before. Cassie Steiner was sporting a physique that was downright unbeatable, unprecedented and unparalleled in the history of bodybuilding. It was as if she was no longer human, she was a creature, a creature of pure, dense muscle. Not a single ounce of fat was found on her body. She was ALL muscle. If Kayla, Gabrielle and Sakura were massive, Cassie was gargantuan. She was ripped to the core, and people could actually believe, with her humungous size, she could literally stop a train dead in its tracks. And let's not forget, hanging over her groin, in its 13-inch glory, was a gigantic cock that could destroy an elephant's butthole. As she strutted her naked body over to the mirror, every muscle in her body rippling with power, the thumping sound of her footsteps like a monster preying for victims in the night, and if the three other girls looked like predators just a minute ago, they have been shown up into humble servants, clearing a path for this superior being, their goddess queen, to admire herself in the mirror.

With oozing confidence, Cassie did a swift, powerful quad stomp that surely enough, shattered the concrete floor beneath her foot, but it mattered not for she had quads thicker than the trunk of an oak tree, the striations showing the fine, rippling details of every muscle fibre, the gorgeous cuts clearly separating the individual muscles from the sartorius, to the gracilis, to the vastus lateralis, rectus femoris and vastus medialis, a river of pencil-thick veins pulsing over them. Her calves were bigger than people's waists, with each individual head of the gastrocnemius the size of a rugby ball. Then, she opened her thick, defined arms and brought them together for a crab pose most muscular, and HOLY SHIT did her muscles blow up into a fear-inducing combination of size, power, strength, striations, feathering and vasculature that could easily humiliate the Hulk, the Venom, the Abomination and the Juggernaut in a bodybuilding posedown.

"Look at me. LOOK AT ME! I AM ALL MUSCLE! NOTHING BUT PURE MUSCLE!"

"Maybe that's what you can call yourself. The best bodybuilders have nicknames. Sienna Cox is The Brutal Belle, Jon Cox is The Genetic Giant, Dana Olsen is The Predator, Yasmin Kim is The Asian Amazon, and Polina Remkova is The Bear Crusher. You can be The All-Muscle! Like Odin, All-Father. Cassie "All-Muscle" Steiner," Dr Steiner suggested.

Cassie slid into a side chest, admiring the impossible striations and incredible thickness in her cinderblock pecs, not to mention the veins running across them. "All-Muscle. I like it," she said coldly, not looking at her uncle.

"And then, Kayla, you shall be...The Monster Queen! Gabrielle, The Man Slaver! And Sakura, you can be Lady Thunderback!"

Once they agreed with the nicknames, Dr Steiner took their measurements.

Cassie's measurements:

Height: 6 foot 11
Weight: 413 pounds
Chest: 80 inches
Waist: 34 inches
Arms: 40 inches
Thighs: 51 inches
Calves: 39 inches
Penis/clit length: 13 inches

Kayla, Gabrielle and Sakura's measurements:

Height: 6 foot 8 to 6 foot 9
Weight: 400-404 pounds
Chest: 76-77 inches
Waist: 32-33 inches
Arms: 37-38 inches
Thighs: 48-49 inches
Calves:  37-38 inches

"Impressive measurements, but I'm still bigger," Cassie teased, showing off a mountainous, well-defined right bicep, the many vessels in her forearms engorged.

"Anyways, now that we know just how RIPPED and MASSIVE were are, Uncle David, why don't you let the bulls out so we can test our strength," Sienna said, but it was more of a command than anything.

(Author note: animal violence along the way. Please read on your own discretion.)

"Oh sure," Dr Steiner stuttered, and grabbing a remote on the table, he pointed it at some of the animal cages in the end of the lab and pressed a button. Emerging from the cages were 5 of the biggest, most muscular bulls that anyone had ever seen. The Sienna equivalent of the bovine species. These bulls were bred for pure, lean, massive muscle. No kidding, because they were genetically enhanced Belgian Blue bulls, and to make them better than regular Belgian Blues, Dr Steiner had dosed them with steroids, making them bigger, stronger, taller and more enraged. Standing on all fours, these monster bulls were taller than an average American man, with horns capable of piercing the doors of a car. And one field experiment saw these enhanced Belgian Blues overturn a charging, I repeat, a charging bulldozer. We shall see how these genetically enhanced girls fare against these genetically enhanced bulls.

But as these bulls emerged from their cages, comparing against the size of the girls, the cattle seemed to have lost that battle for size supremacy. While the bulls were taller than the average man, these girls were at least 3 times more massive and at least a foot taller than the average man, given them a unique advantage. While the bulls looked as if they could trample and crush the average man, standing next to these huge girls, the bulls were made to look like mere sheep. As the bulls, with their pent up rage, charged towards them, the girls widened their stance and showing absolutely no signs of fear, smirked sinisterly at their coming prey. The first bull went up against Kayla but anticipating this, she grabbed the bull by its killer horns and twisted her body into a 360 degree spin. This move dragged the bull almost a foot off the ground and using the momentum of the spin, she released the bull and sent its massive 3000 pound body hurtling towards the wall. This same amount of force generated by Kayla could destroy an entire car. Surely enough, everyone heard the sound of shattered bones, and the splatter of bovine blood against the wall. An examination of the cow's body later found that every single bone in its body was fractured and all its internal organs were crushed into a giant ball of pulp. And Kayla did that in less than 2 seconds, and made it look as easy as it was.

Next, the second bull headed straight for Gabrielle, and waiting for the right moment, she sidestepped, making the bull miss her. But just as the bull's head went past her, she wrapped her strong, gigantic arms around its neck and wrestled the 3000 pound animal to the ground, strangling it until its entire body went limp. Then, if that wasn't enough, she squeezed even harder until she felt the neck snap. With the bull dead, she lifted the massive creature over her head, and tossed it where Kayla left the first bull, forming a pile of bovine carcass at one corner of the compound.

The third bull charged at Sakura. Just like Gabrielle, she sidestepped it and wrestled it to the ground, but instead of mangling its neck, she decided to give it a giant, deadly, bearhug right at its midsection. This bull could easily have a circumference wider than two oak trees, but one must never underestimate the dooming crushing prowess of Sakura's bearhug. Ribs and bones were crushed, giving way to the inescapable strangle of her arms, the sound of breaking bones like music to her ears, then the thick muscle began to give way, and pretty soon, that giant midsection of the bull was crushed to a diameter no larger than the waist of a swimsuit model. No amount of power flailing from the bull could free it from her Anaconda grasp. Eventually, the bull went limp and was no different than stewed beef.

The last two bulls had the biggest girl in their sights: Cassie. The All-Muscle. But two bulls didn't make them any safer than their ruminant friends. The first bull approached Cassie to her left, but she jumped on top of it, her massive 400-pound weight too much for the bull to support, and she wrestled it to the ground, with one arm locked around its neck. Standing up, with the bull still trapped between her unstoppable left bicep, she awaited the second bull and then just as it was about to attack, she ducked under the bull's head and clutched underneath its neck with her free right hand. And then, just with that one arm, she lifted the bull off its feet, and slammed it straight into the ground, belly-up, clamping its neck between her powerful grip and the concrete floor. The bull's neck provided no resistance at all, and its entire trachea, larynx and esophagus compressed  underneath her fingers, splattering like a tomato pressed against the kitchen table.

And she did all this with the first bull at the mercy of her arm lock. She then enforced her grip with her other arm, and with one simple twist, snapped the bull's neck in half. Just like Gabrielle, she lifted the 3000 pound animal, did some shoulder presses with it, before tossing it towards the four cryochambers in the centre of the lab. The entire machine exploded in a ball of flames, and Cassie smirked, placing her hands on her hips with a job well done.

Well of course, this outraged Dr Steiner, who was not pleased to see his life's work go down in flames...literally.

"What?! Cassie! Why did you do that?!"

Cassie put one foot forward and stepped in front of her uncle. That, with her MASSIVE size, and pumped up muscles, plus the cold, heartless eyes, was enough to whip Dr Steiner back into submission.

"What did you say to me, dear Uncle?" Sienna said.

"N-n-nothing, my niece."

Sienna placed a strong hand under his jaw, and lifted him off the ground, her powerful but still feminine hands covering almost his entire face.

"Ha! You're even lighter than a pillow! You know, I could crush your skull in my hands, right here, right now. It will be easy, like crushing a bowling ball. Now tell me, dear Uncle, why shouldn't I do that? With you out of the way, Dominus research will stop dead in its tracks. And all I have to do then, is to eliminate the remaining Dominus already in this world. Me and my girls will be all the Dominus there is, and the power of the world, will be in our hands..."

"P-p-please..." Dr Steiner struggled.

Cassie laughed and released him, tossing him onto the ground. "Well, I guess it will be nice to have a slave around here. Uncle, I feel SUPER horny right now. Get me a couple of male bodybuilders in here for me and my girls. We will fuck them DEAD! And then, clean up all these cows and cook them. I am so FUCKING HUNGRY! I haven't eaten in 11 months! And I can LITERALLY eat an entire cow! And while you're at it, pull a few strings and get us a place in that upcoming Olympia. I wanna show this Cox posse what REAL muscle looks like..." and with that, Cassie took a deep breath and struck a terrifying most muscular pose that made her uncle shit his pants.

"HURRRRR! OH YEAH! ALL MUSCLE!"

That night, the girls were treated to the cows they killed. All roasted, medium rare. And it was no doubt they each, I repeat, EACH, finished an entire bull respectively, all on their own. Big muscle requires big meat, and they were ALL MUSCLE.

[UnholyDk1103]

Wow, I'm really loving this. Keep it up!

[pirateparag]

  Enjoying the way the story is progressing especially with the new dimension of Cassie into the play ..

[Elmanouche]

Things got even bigger, nice one.

[phil123]

"HURRRRR! OH YEAH! ALL MUSCLE!"
+k. Thanks

[iwhehuejrke]

the story has a surprising end