Appetite [FMG/MMG, miniGTS, PE, ascension, power hungry, female-on-male action]

MGS-and-M · December 11, 2024, 12:11:10 PM

Nathan halted when he looked at his cellphone.

<Just sending this message to let you know that your invention works

>

He was away from home, spending the Sunday doing some shopping. He immediately dropped the clothes he was going to try on, left the store and ran to his car, driving home as fast as he could.

_______________________________

ZFit was actually an acronym. The Z came from being a ZCorp's division. F stood for "Flow", while T stood for "Training".

The branch's core business was food supplements, divided in two categories: medical and fitness. According to them, feeding is the fundamental act that keeps the "flow of life" going, so the body can use their nutrients to stay healthy by doing exercises. So, their products went from meals to hospitalized people that can't eat properly to whey, creatine and similar stuff.

The I in the middle meant "Innovation", and there's where Nathan comes in.

He was part of ZFit's department for researching and developing new ingredients, products and manufacturing techniques. It was a prestigious sector of the company responsible, for example, for the Ready Shake, a dense nuke of protein and other organic components that, as the name implies, comes ready for consumption, with a good final price and, best of all, with really tasty chocolate, vanilla and strawberry flavors.

Sometimes, the chief researchers allowed Nathan and the other assistants to take some of the new recipes to their houses, to give a "field test" to some of the products that had a good chance of being commercially released. Some nice ones, some awful ones. He proved a yogurt that had never hit the shelves, but was damn good.

The last one he brought home was in the early stages, but the initial tests had no adverse effects and were heading for fine results.

The one Celine apparently had stolen from his fridge.

Nathan's cellphone vibrated again.

<I'm in the gym, btw>

He accelerated more.

_______________________________

To ease monthly costs, Nathan lived in a rented house with other five people. Was a great find; although a little old, it had a suite for each tenant, a good kitchen and no structural issues.

Celine was the worst of them. She wasn't disorganized, helped with general tasks, but there was something tricksy and mocking about her that always bothered Nathan. He was sure that she had sneaked beers from his stock in a few occasions, playing the fool when they came up and easily getting away with it; her 1.54m [5 feet 1] petite frame and her cute, girlish face conveyed in an almost automatic impression of innocence. He could swear that she winked to him when the others discarded her as a suspect, but he was never able to prove anything, for that and for other things in the house that went missing.

That was the first time she crossed the line. She had never been that bold about her scams before. But what really concerned him was that she was being too playful in the messages. That was not a good sign.

He stopped the car at the house and went straight to the basement.

With a few months' savings, they managed to buy a fair amount of equipment and used part of the vast space under the house to set up a small gym. It was rudimentary, not well ventilated, but there were no professional athletes among them that would demand anything fancier.

As he climbed down the wooden stairs, he began to hear female pants.

Her girlish voice came out, put him on alert.

"There you are!"

There was only one light on, the weak, yellow one above the multifunctional, but he could distinguish Celine on the bench, doing skull crushers. With one final, long pant, she dropped the weights. Nathan jumped; by the loud thud they made when they hit the floor, they seemed strangely heavy for a small girl like her.

She sat. Looked at him mischievously.

"Thanks for the chat yesterday"

"What are you talking about? We barely talked yesterday"

"But with Roland, oh you talked"

A clear flash of yesterday's booze night suddenly came to surface. Nathan was on the balcony with Roland, blabbering more than he should about his department's newest creation: an enzyme that optimizes and accelerates the absorption of whatever the person ingests.

More than that. With his voice visibly altered six beers later, he revealed that he brought a sample home.

Seeing the opportunity to catch her in the act, Nathan subtly picked his cellphone and turned on the recorder.

"Do you have any idea that what you've done is stealing?"

"You're always saying that those stuff you bring from your job are for try outs. Well, I'm just helping you"

"Without me knowing"

"Now you know. And first hand"

"What the hell is that supposed to mean?"

Her voice came out strangely threatening.

"It won't be easy to hide this for too long"

Celine bent to grab two other weights resting on the sides of the bench. They looked big, but she casually lifted them. Nathan kept looking.

"So you admit you stole it?"

"Yeah, Nathan, I admit"

That caught him off guard. He lost track for a second.

"...and where did you hide the rest?"

"Rest? What rest?"

She smirked roguishly, noticing the glaring countenance of apprehension that appeared on his face.

"People are supposed to take –"

"No more than three drops a week. Yeah, yeah, you spared no details last night. But, seriously, one drop every two days? That's barely anything. So I thought, let's give it a real test!"

She rose the weights, then started to do shoulder presses.

"You must... Urr... be a... Urr... terrible scientist. Till now... Urrr... you haven't showed... Urrr... the slightest interest... Urrrr... about the results"

She purposely dropped the weights from above, making an ear-splitting bang as they hit the floor.

"But let's start from the beginning. This morning, I waited for you and the others to leave and after an awful lot of time I was finally alone. It was almost lunch hour, good timing in the end"

Now that she was sitting still on the bench, partially hidden in the semi-darkness of the basement, Nathan felt an uncomfortable oddness. Her silhouette seemed... Bigger.

"I took it and I got hungry, like, instantly. But I mean, like, hungry. I ate my share of yesterday's pizza leftover, then I took all the rest of the pizza, and Janice's yakisoba, and the chicken nuggets. It was like I ate a salad, not bloated at all. Actually, I was feeling really good, so I came down here and hit the treadmill. Started walking, then jogging, accelerated a little more, then more, and suddenly I was running fast, way faster than my PB. After 15 minutes, I was not exhausted, but invigorated... Running was not helping me burn the energy that I was feeling. So I looked to the weights... I'm not a gym rat, but it's been like, I don't know, two hours that I'm here? I just went up once to eat some more. And you know what? I'm still hungry..."

She pretended to remember, without a single care about sounding truthful.

"And, oh yeah, about the results... Why don't you turn on the other lights?"

Nathan took a few seconds to react. Without taking her eyes off of her, a bad feeling screaming inside his head, he slowly stretched out his arm and reached for the switch on the wall.

The cellphone promptly escaped his other hand and fell on the floor. Now in clear view, Celine's mocking grin widened.

"What happened, Nat? Cat got your tongue?"

Indeed, he stood in a dead silence, seeing himself in some sort of bizarre nightmare. The petite, scrawny Celine was gone, and in her place was a very shapely fitness model, beginning to scratch the realm of bodybuilding. Her old, baggy Shego t-shirt that she could use as a dress was now outlining a wide chest, so large that her tiny boobs were parted in the vast surface, the sleeves slightly stretched by the impressive combination of her biceps and triceps, standing out even with her arms relaxed.

Her waist, however, kept thin, giving her a luscious hourglass physique. Covered by a well-defined 6-pack, in full view since the t-shirt didn't have enough fabric anymore to hide them, the small hills of muscle moved sensuously back and forth as she breathed. And to wrap up her alluring figure, her thighs were way thicker, with carves starting to appear between the quads muscles, her long brown hair tied in a messy ponytail the cherry on the cake.

The research had pointed that the enzyme had a good potential for assisting muscle workouts, but that exceeded any prediction.

Nathan blinked a few times in disbelief. After the ridiculous professional first analysis, the real deal came to his senses: she was big, strong and sexy like nobody he had ever stood in person.

Her frisky voice rang through the basement again.

"Ok, break's over. Time to get serious"

She adjusted her new gorgeous body in the bench.

"I'm not kidding about your enzyme thing. It leaves a hole in your stomach! So... I got Trent's shakes"

Her stomach rumbled, loud enough for Nathan to hear. She looked down at it.

"I think he won't mind"

That's when Nathan noticed a bucket near her. His eyes grew wide when he realized that it was filled to the brim with Ready Shake.

She raised it and, bringing the edge to her lips, started to drink it down. Gulp after gulp, the dense content dwindled until the bucket was completely empty. She tossed it aside.

That was 7 liters [1.8 gallons] of pure protein, he thought. He was mesmerized with the mere fact that she had been able to ingest that ludicrous amount of the dense liquid; he could see her tummy plumped as a result. However, what came next scared the hell out of him.

She took a long, deep sigh and, as the air came out of her lungs, the volume on her midsection deflated slightly. With each new breath, Nathan watched in shock the roundness shrinking further and further inward, until her belly was as flat and defined as before.

She finished with a joyful last sigh.

"They are actually tasty! And you know what? I could drink ten more of those. It's a shame that he had only... Ahhh... These"

The tiny moan broke out at the end of the sentence together with a shiver that shook her whole body.

Nathan got even more worried. Her muscles weren't looking normal. They were subtly trembling, like a small vibration, giving the frightening impression that they were about to burst.

When Celine grabbed two heavy dumbbells that she hadn't used before, thick veins distended all over her arms. She then started doing bicep curls.

"I was thinking... Urr... That the enzyme would give... Urr... Some dull results... Urrrr... More of a confidence boost. But it... Urrrrr!... Works really fine"

Nathan swallowed hard. Her biceps were not just pumping with the strain. With each repetition, the bulge in her arms was clearly increasing, little by little.

After the fifteenth rep, instead of slowing down, she started to fasten the pace, her grunts of effort filled with an alluring vigor as she could feel not only the round mounts continuing to grow, but her whole arms enlarging as well. Her veins thickened more, snaking up and down her shoulders, traps, midsection and legs and, as she kept fiercely going on with her unending set, her whole body began to swell. Nathan watched in panic every muscle, even the ones not exercised, slowly expanding.

She finally stopped. Panted a couple of times. Changed position and, without any pause, started doing military presses.

"And that's... Urrrr... Not only it. I'm feeling really energetic! Urrr... Did you notice... Urr... That I didn't burst a sweat? Those are 25kg [55lbs] dumbbells, Trent... Urr... has a hard time using them"

Rep after rep, her shoulders and traps were getting more prominent, standing out around her slim neck. The other muscles, just as with the curls, were slowly growing together with them.

As she kept going, each repetition seemed easier and easier.

"And guess what?"

She stopped. Threw one of the dumbbells in the air, then caught it back like it was a shoe box.

"They're getting useless pretty fast"

Still holding them, she laid on the bench and reached another two 40kg [88lbs] dumbbells on the floor, making two 65kg [143lbs] improvised "X" dumbbells for each hand. Positioning her arms, she began doing bench presses.

"I... Urrr... Can do this... Urrrr!... For hours!"

In a frantic state, she was doing the reps almost with no breaks between them, her groans deeper and sexier as her chest began to tremble and fill with muscle mass. She cooed with delight seeing her torso rising more and more above her chin, the bench becoming too small to fully accommodate her enlarging back. One sleeve ripped, then the other, unable to contain her powerful, veiny expanding biceps. The effect of the exercise kept spreading and her thighs, even resting, were getting so thick that her shorts were barely covering her crotch.

Suddenly, she dropped the weights. Falling heavily, they opened two cracks on the concrete floor.

She let go a pant that exuded power.

"By the way, thanks for staying 'till the end of the show"

Celine stood up. She was not only staggering muscular, but also taller, her 1.87m [6 feet 2] frame half a head higher than Nathan. Her tiny boobs were gone, engulfed by the ripped mass of her large, broad fem-pecs, her veins so pumped that Nathan could see them under the thin fabric of the t-shirt.

"Now let's see"

She approached Nathan with a scary, confident smile. That big, commanding figure made him instinctively step back, leaning on the wall behind.

She reached him and grabbed his forearms, holding them against the wall. With her thighs, she held his legs still.

"Let's suppose that you're trapped behind a locker, with no space to squeeze through the sides. You would have to pull it to make you way out, right?"

He tried to release his arms, but her grip was strong.

"Well, here you are"

He struggled one, two times. She didn't move an inch.

"That's what I thought"

Pressing against him, he could feel her nipples getting hard.

"Oh, it's so good to watch you trying to escape... But that's enough for now"

Her eyes had a terrifying glow as she stared deeply at his.

"What you brought was a sample, as you said yourself"

Her next words froze his blood.

"If there's a sample, there's a source"

He desperately struggled again, to no use. She smiled.

"Any last words?"

"No! Are you crazy!?"

"No? Ok. Night-night!"

_______________________________

A splash of cold water brought Nathan back.

"Finally! What a heavy sleeper you are!"

He widened his eyes. Confused, he was seeing only blurs, his head hurting like hell. As his vision gradually became clearer, he distinguished the large freezer of his work lab at ZFit.

In an impulse, he tried to stand up, but Celine calmly used a single hand to keep him seated on an office chair. The sheer strength packed on that seemingly casual push sent shivers down his spine.

"Chill out, Nat. Don't want you passing out again"

"How the fuck did we get here!?"

"You boys are all the same. Just had to use a tiny bit of my charm to get closer to the security guards. For some reason they couldn't take their eyes off of me" – her playful, girlish smile appeared – "Didn't need much to put them to sleep, just as with you"

She noticed his dumfounded expression.

"C'mon! Of course I knew where you work. You're really talkative when you're drunk"

Pulled an access card from her pocket.

"And with this beauty I've got from them, it wasn't hard to find your little work cave. It's kinda fancy, I must admit"

Celine leaned down her luscious muscled body to be face to face with Nathan. The angle gave him a plain view of how wide she had become, her torso projecting up and down from her head, the beefy traps forming a large arch behind her neck.

"Now, you're gonna be a good boy and show me which of these bottles has our pretty elixir"

In the unsettling silence that hung over the laboratory, only the faint hum of the freezer could be heard. Its soft light showed a wide variety of jars, boxes, beakers and flasks, labeled with technical acronyms.

He stood quiet. Her smile faded.

"I don't want to have to force you, Nat"

He gazed to the freezer. Slowly stood up, walked to it, opened the door. Looked around for a moment, then grabbed one of the many bottles. Without saying a word, he stretched out his hand towards her.

She took the bottle.

"D.Z.W.P-139... You scientists do that on purpose, right? So that no one but you understand these crappy codes. Anyway!"

When she was finally distracted uncapping the bottle, Nathan hastily opened the freezer's door again. He knocked over vials and test tubes while clutching a flask, promptly darting to the lab's sink.

Celine threw her bottle away.

"You sneaky little nerd!"

The sound of breaking glass was followed by fast, heavy steps. Terrified, Nathan kept running, but, just before reaching the sink, a powerful grip on the back of his neck halted him. Tightening her dainty fingers deeper on his skin, Celine lifted him off the floor.

Using her free hand, she turned him around until they were face to face again. She pressed his throat, almost suffocating him.

"That was very dumb of you"

She picked the flask from his feeble hand. Stared at him. His desperate expression was giving it away; that was the enzyme.

Her raised arm caught her attention. Although more powerful than any other human arm in history, it was beginning to quiver slightly by the effort of keeping Nathan hanging in the air. She frowned.

"I'm still not strong enough... Time to fix that"

"D-don't..."

"Can't hear you, Nat. Don't what?"

"The w-whole flask... It's t-too much..."

"This little thing?"

Popping the lid, she brought the flask to her mouth, then turned it. Nathan watched in horror the gulps crossing her throat until she drank every drop of the enzyme compound, finishing with a suck at the tip.

She let go a deep sigh. Then glanced to nowhere with a strange expression on her face.

Suddenly, her belly started to contort with intense spasms, her 6-pack shaking like a deranged machine. A few seconds later, her stomach growled like a huge, ferocious caged animal.

She raised her eyebrows.

"Wow. Now I'm feeling reeeally hungry"

As if entering a trance, she dropped the flask, that smashed on the floor. Picked up a duct tape on a desk nearby, put Nathan back on the office chair and tied him.

Her soft voice sounded faint, almost a whisper.

"Stay there"

"No! Celine, you have to stop! You canughhh!"

A strap of duct tape sealed his mouth.

His muffled screams intensified as he saw her walking towards a 70 liters [18.5 gallons] tank of Ready Shake that they had on the lab for general tests.

Stopping in front of it, her placid eyes scouted the equipment. A post-it was glued on the base.

"New formula... Interesting. Let's try it"

Cracking the tank structure, she detached the acrylic reservoir, tilted her head back and positioned the tapered outlet on her thin lips.

First, the thick liquid went out slowly, but seconds later it started to flow faster, sucked down by Celine's raging stomach. No breathes, no pauses; she just drank, and drank, and drank, her body ravenously absorbing the inhuman amount of crude protein, so fast that her belly remained impeccably flat. When a loud slurp came out, a charming hint of disappointment embellished her face when she noticed that the reservoir was already empty.

But it didn't last long. Right after, her body began to tremble, way more vigorously than at the gym. Nathan could see her struggling not to moan, her breathing coming ragged out of her mouth as her muscles bulged, almost unable to contain the sheer latent energy blooming inside her.

Getting rid of the reservoir, she glanced around. Her eyes locked on the lab's mainframe.

She approached the enormous equipment, a 2.30m [7 feet 7] sturdy block of circuits and metal heavier than a Smart car. Her body shuddered even more in anticipation.

"You'll do. For now"

Nathan was scared to his bones with what was about to happen, but also... Deeply aroused. He suddenly realized that the simultaneous fear and excitement was giving him a boner like no other he had ever had.

A bitter taste rolled over his mouth. He was getting turned on by... Her. The most deceitful girl he had ever met, the person he had come closest to hating... But he simply couldn't help but getting hard.

The situation was otherworldly. No human could come close to lift that mainframe alone. And that's exactly why his dick throbbed like crazy when she flexed her legs and held the bottom of the metal cuboid, one hand on each side.

The firm grip instantly made her veins pop. She filled her lungs with air and, projecting her body upwards, she tried to lift the huge machine.

A harsh groan came from between her clenched teeth, and her muscles, as if awaken by it, began to expand at an alarming rate.

Thrusting her upper body, her legs started to shake frantically, forcing a monstrous surge of mass on her calves and thighs. Her biceps and triceps quickly doubled in size, making her arms thicker than soda bottles. Tearing what was left of the sleeve, her shoulders emerged with solid mass while her chest expanded enormously under her neck, enlarging and widening her already big frame and ripping her t-shirt, the deep carves of her pecs and back visible through the fabric's gaps.

She let go of the mainframe. It hadn't moved, but she was much bigger and taller than before. Annoyed, her lips were slightly tensed.

"You don't understand, do you?"

She clutched the sides harder. Her voice rang out with an alluring certainty.

"You won't stay down"

Her eyes were sparkling with a dire determination as her body tensed again and, like a boiler heating up drastically, her muscles began to overflow with veins, longer and thicker by the second, her energy-pouring blood fueling her muscles that started to grow even bigger.

Nathan could feel his heart beating faster. Her massive frame was becoming so huge that it was blocking his view of the mainframe; he could only see the middle, through the sides of her thin waist. He startled when her immense torso finished shredding the remaining rags of her t-shirt, her back quivering and enlarging like a mountain erupting from Earth, her traps emerging on top, hiding her neck.

That's when he heard a sharp sound of scratching metal and saw, bewildered, the mainframe moving slightly.

Celine released it again. Tore off her overstuffed sneakers, stretching her bigger, yet slender feet, a heavy thud echoing as she set them bare on the floor. The anger on her angelical face was radiating an utmost yearning, utterly frightening and arousing.

Bending much more than before to reach the base, she grabbed the mainframe once more. A new surge of muscle mass immediately ripped her shorts, her veins pumping larger than fingers.

She began to groan, a low, sexy groan. It was not just effort anymore; she was enjoying it.

A strong wave of pleasure flashed through her expanding body as the mainframe rocked and ceased to touch the ground. She continued to groan, and it was getting harsher, deeper, terrifying, yet dripping with lust as the robust machine slowly rose, her massive thighs filling with more hefty mass as they little by little stretched up until she was standing straight again.

Taking a short step, Celine was sideways to Nathan, holding alone the enormous cuboid, its base at her abs level, her immense veiny arms keeping it steady. His cock jerked desperately with the monumental scene.

Celine's expression, however, was sober.

She closed her eyes shut and forced her forearms to raise the machine even more. Feeling a tremendous burn, her volleyball-sized biceps bulged to the absolute limit, then rose 3cm [1 inch] higher as their mass increased under her tight skin.

"One"

She lowered it. Began lifting it again, her arms shaking frantically as the two globes of ripped flesh swelled even larger.

"Two"

The sheer power kept spreading, making her whole body bigger, wider, taller.

"Three"

Another curl, and her biceps became as big as basketballs, so packed with muscle mass that they seemed about to explode.

"Four"

Pressing the front and the sides, her monstrous growing muscles were engulfing the mainframe.

"Five. Six. Seven"

An alluring moan escaped her lips. The curls were not difficult anymore.

"Eight. Nine. Ten"

She suddenly dropped the mainframe, which landed with a whopping bang, smashing the tiled floor. Standing a head shorter than her, it didn't seem that big anymore.

Slowly turned to Nathan. Still coming back from her fierce trance, she glanced down to the mountainous ripped mass of pecs that were projecting from her chest and the ultra-large arms, a single humungous forearm thicker than her waist used to be, the relaxed biceps pressing the sides of her torso with their inhuman rigid mass, her mouth agape. Even the always mischievous, mocking girl was astonished with what she had become.

On the reflection of the fridge doors, she admired her naked self in all her glory. Towering at 2.57m [8 feet 5], there wasn't a single portion of her body that wasn't overflowing with muscles, meticulously arranged to shape the biggest and most luscious hourglass figure a woman had ever had, her voluptuous and massive curves sculpted to the absolute perfection. She could feel a raw, incommensurable power coursing through every fiber of her being.

"I'm... Amazing..."

Her open mouth shifted to a wicked smile.

Nathan's skin shivered when his colossal housemate gazed down at him, his dick harder than ever. Celine undid her ponytail, leaving her beautiful long brown hair loose, then calmly walked towards him, her imposing steps sounding like hammers pounding the ground of the lab.

Stopped in front of him, her tree-trunk thighs on his eye level. Nathan instinctively gazed up as a sweet, mouth-watering scent reached his senses. Not only she wasn't showing a trace of shame for being naked, but, like a goddess of fertility, she seemed proud to be displaying openly her sex, the thin, pink labia deliciously moistened with her love juices. She had to bend down a little, so that her huge fem-pecs wouldn't block her view.

"Seems that someone down there was really enjoying my routine"

Nathan blushed. There was an obvious bulge on his pants. However, as he was unfortunately aware, it was nothing particularly memorable.

She stared at it with the most contemptuous pitiful face.

"Not very impressive, though"

A malicious grin curled the tip of her lips.

"Suits you fine. A small dick for a puny, pathetic nerd"

Nathan just stared back.

"This little exercise made me hungrier. Now where could the shake production line be?"

Leaving Nathan tied, she turned her wide back to him, her hips swaying sensuously as she headed to the lab's exit.

Nathan didn't try to stop her. There was nothing he could actually do, but, as she crouched through the door, he didn't even move.

His erection quickly deflated. For more than a minute, he stood in a dead silence.

However, his mind was boiling. Something broke inside him, a sour feeling simmering to surface.

Her... Her...

Her!

Like snapping out of a coma, he rolled the office chair towards the sink with the tip of his feet. He struggled with a furious will until he freed one of his forearms and, at the limit, he reached a knife. He adjusted it in his hand as best as he could and frantically began to saw the duct tapes holding his chest. One strap ripped, then the other, his shirt tearing together with them. He struggled more, flailing like a madman, and finally the tapes succumbed.

He took off the stripe on his mouth, took a deep breath. Finishing releasing himself, he rushed to a small room inside the lab.

His boss' office.

Slamming the door open, he stopped in front of his private freezer.

19-65-9-17.

He knew it by heart. He always thought that it was careless of his boss to share with him the passcode to his own freezer, but it could help in an emergency if he wasn't around. Nathan was chosen because he was very trustworthy; he would never sneak into other people's things.

Like her...

Kneeling, he inserted the code and the freezer unlocked with a low beep. The cold air embraced his hand as he took out a small bottle.

The spare enzyme.

He hesitated, scared to death with what would happen, his shaky hand almost spilling the translucent liquid.

Then the fresh image of Celine's gigantic figure looming over him flashed as clear as the day in his head, her cruel, triumphant smile marking the most humiliating moment of his life.

With one quick, erratic movement, he rushed the tip of the bottle to his mouth and forced the enzyme down his throat, almost choking. Finishing the content, he stared at the empty bottle, not believing what he just did.

A piercing pain made him instantly regret his rash decision. Writhing, he fell to the ground, hugging his belly in a fetal position as a dreadful sensation of emptiness spread through his body. His stomach then rumbled, a deep, unnatural growl. Gathering all forces he could, he stood up, leaning and knocking things over on his boss' desk and, quivering like in a snow storm, he left the room and the lab, dragging himself through the corridor leading to ZFit's bottling sector.

His stomach rumbled again, louder, harsher. The hunger was almost unbearable. In panic, he could see his body consuming itself if he didn't ingest something very soon.

Turning the lights on, the halted machinery came to view. His faltering eyes surveyed the surroundings until they distinguished the Ready Shake filling tank.

He tried to detach the rubber feed tube, but his limp hands could barely grip it. Finding a screwdriver on a toolbox left there, he stabbed the tube until a puncture started hosing the shake.

He covered it with his mouth and drank.

And drank.

And drank.

He knew the amount of shake entering his system was simply inhuman, but his stomach kept craving for more, rampantly digesting the river of protein he was gulping down.

A choke forced him to step away from the tube, the leak still flowing, spilling shake all over the floor.

His body kept trembling, but it was different now, a heated, strong motion as he felt his limbs firm again, warm and pulsing with vigor. It was like he had been injected with nitroglycerin, ready to explode at the slightest movement.

A sealed box of Ready Shake caught his attention. 60 bottles inside, around 50kg [110lbs]. Grabbing the sides, he mechanically tried to lift it.

He almost lost his breath as a sliver part of the immense energy confined inside him was instantly released, forcing his modest frame to get visibly defined and almost rocketing the box out of the floor. His eyes widened as his arms kept growing, adapting to the weight, his muscles all around following, filling with mass as his whole body expanded. Soon, it was like he wasn't holding anything.

Tossing the box, he turned around. Found a ride-on floor scrubber. His mind rushed with exhilarating excitement, his muscles bulging in anticipation.

He approached the machine with an unexpected boldness, his evolving body giving him a burst of confidence like he had never felt in his life. Not wasting time, his fingers wrapped around the base between the tires.

His veins popped. Astounded, Nathan could feel the blood running faster inside them, his heart accelerating, beating like a thunder storm, gushing the energy inside him that began being converted into humungous amounts of muscle mass. In mere seconds, his body doubled in size, his shirt tightening around his expanding pecs, the sleeves ripping by biceps and triceps erupting like forces of nature, a raw power emanating from them, the fibers of solid flesh multiplying, burning with the effort like molten lava.

Holding the heavy machine like it was a flower pot, Nathan felt dominant, unstoppable, his enormous muscles trembling under his tight skin, begging for more energy, for more mass.

And he gave them. As he started doing bicep curls, his muscles eagerly began to grow again. His shirt ripped completely, the rags falling on the floor as his back continue to enlarge, so broad that could eclipse the sun. His abs stiffened and swelled, harder than a Kevlar vest.

"Yes... I want more..."

He fastened the pace. The burn was intoxicating, the pain and pleasure transforming his body into a titanic, primal force, the floor scrubber dwarfed by his massive frame, taller, wider and larger with each rep.

In absolute ecstasy, he switched exercises, doing squats.

But wasn't able to keep it. As his huge thighs rubbed his dick, an uncontrollable shock of pleasure tensed his enormous body.

An obscene bulge started to form on his crotch. He groaned when the beast surging between his legs stretched the fabric of his shorts, its confinement rapidly becoming too small for its increasing mass.

His chest heaved as a stirring sensation of virility and power invaded his senses. A massive surge of blood pushed his undies to the breaking point, and another jolt of pleasure crossing his engorging shaft finished the job; his monstrous tool released itself, tearing the clothes on its way. Free of any restrictions, it swelled and grew until it reached an incredible 38cm [15 inches].

Throwing the floor scrubber aside, Nathan stared down in silence. It was the biggest, manliest cock he had ever seen.

And it was his cock.

The thought triggered a feral instinct on him. He grabbed his rod with both hands, the hypersensitive shaft impossibly hard and thick, each pulse of its veins exuding sexual power. Stroke it slowly, feeling its weight, its sheer rigid mass. Stroke faster, panting as waves of pleasure travelled his body, grunting ferociously as a powerful orgasm was approaching. Thrusting his chest forward in a motion dripping with dominance, he saw his cockhead swelling to the size of a tennis ball before a thick, long stream of semen blasted out of his manmeat like a gunshot. His apple-sized balls twitched and contorted as more and more of his potent seed was released, his monstrous cock jerking wildly with each volley of jism, the pleasure so intense that it was almost tearing his brain apart. After 12 huge loads, it finally came to rest.

He collected himself right after, ready for another round. For many other rounds. His 2.38m [7 feet 10] muscular Adonis body was irradiating virility; he was so horny that he could see himself fucking an entire army of women.

Moving his toes, he felt something sticky touching his feet. It was the shake; the leak formed a viscous pool of protein on the floor.

His stomach rumbled. Made him realize something.

Although immense, he was still smaller than her.

Her...

Storming to the filling tank, he ripped off the rubber tube and sucked voraciously the shake, his stomach shredding and processing the torrent of dense liquid like a meat grinder. His eyes widened as he could feel his cells overflowing with energy.

It was then that a high-pitched whistling suddenly cracked from a ceiling speaker.

"Is it working?"

It was her.

"Oh, great! Hello, Nat. I'm using the surveillance system"

Releasing the tube, Nathan gazed around until he found the security camera.

"Looks like you're having some fun yourself!"

Celine's feminine, playful voice had an immediate effect on his testosterone-brimming body. Looking down to his crotch, he watched in awe his semi-erect giant dick throbbing and swelling to full turgidity again as a raging sex drive took over his senses.

He heard a giggle before she continued.

"This surveillance system is great! With the access card, I have control over some cool stuff, like the compounds distribution"

Suddenly, the leak from the protein tube ceased, a red light appearing above the tank.

"No more free shakes for Nat!"

Her voice came out as provocative as ever.

"If you want it, come to the central production plant"

Another whistling, and the speaker went silent.

At that moment, his mind went blank. There was only the booming sound of his steps, battering like a locomotive approaching the last location perceived by his ears.

He entered the plant. All lights were on, reflecting on the white walls and on the enormous apparatus scattered around a space the size of a football pitch. Although being the largest sector of ZFit's, nothing there was remotely close to attracting more attention than Celine.

She was bigger, almost 3.00m [9 feet 10] tall, and somehow even prettier and sexier than before. Naked, one hand was resting on her huge thigh, the other caressing her 6-pack, her delicate fingers fitting on the carves of her ripped muscular abs.

Nathan's erection had shrunk a little while running there, but, seeing that youthful erotic goddess in front of him, his immense rod instantly became iron-hard again, the veins crawling the solid shaft so dilated and the red, angry head so engorged that it seemed even bigger and thicker.

A cunning smirk appeared on her adorable face.

"Oops, guess I took away the stock you were using"

"You sneaky thief"

She giggled girlishly.

"You know... Your beers always tasted better"

Her hand slid tenderly from her massive quads to her crotch.

"There were so many times that we were alone at home, I was in the mood, but you're so... Lame"

With his libido and anger out of control, Nathan dashed towards her and clutched her waist, pulling her immense body clear of the ground. With a harsh move, he toppled her over, leaving her lying on a conveyor belt right behind.

At no point she stopped staring at him. Ending between her thighs, he could feel the base of his massive cock touching her pussy, the hotness of her love juices stimulating it even more, the long, rigid shaft pointing diagonally between their gazes.

"I'll show you who's the lame"

She moved her hips, rubbing her moistened sex against the rock-hard manmeat.

"Yes. Show me"

With her mischievous smile taunting him, he ferociously moved her backwards, grabbed his dong and positioned the swollen head between her labia, feeling shivers of anticipation coming from her monumental body, and mercilessly shoved the enormous rod inside her.

She purred, a low, alluring moan as inch by inch his mammoth schlong invaded her privates. He groaned back, her velvety canal exerting a pressure around his shaft that was simultaneously smooth and strong. He cracked a smile back, his oversized member completely enveloped by her sex fueling a wicked sensation of masculinity and power.

Celine panted, regaining a glimpse of sobriety. Her eyes were burning with desire.

"See that 250kg [551lbs] protein tank over there? I've just emptied it"

An uncontrollable moan interrupted her as Nathan's cock jerked violently at what she said.

She continued, her sweet voice sounding like a celestial chime.

"I was wondering here if the extra stimulus can accelerate my ascension"

Behind Nathan's back, her legs slowly and subtly wrapped around his waist.

"Now be a good boy and keep fucking me"

When the penny finally dropped, he tried to get away but, even with his enormous new strength, he found himself trapped, her entangled feet giving him a firm waist lock.

Using just a fraction of her power, she forced his cock fully back inside her. He struggled, only to see the humungous energy inside her starting to react, bulging her muscles.

"Yes, Nathan... Keep trying to escape"

She loosened her grip slightly just to push him back again, cooing with delight. Nathan could fell her veins dilating, standing out like bumps on her thighs, pleasure beyond comprehension irradiating through his body as her vaginal muscles tightened around his dick, surpassing his initial panic.

But it quickly came back, as he noticed the vicious grin on her face.

Extending her arms, she positioned her hands under a large iron pipe just behind her head. Nathan followed the pipe's ends, a cold sweat breaking on his forehead as he found two forklifts roughly attached to them.

Her other growth spurts seemed like nothing at what Nathan witnessed next.

And felt.

It was like being half-buried when an earthquake started, directly bounded to a power so gigantic that it was shaking the very foundations of the planet. As she strained to lift the tremendous weight, the sheer energy inside her blossomed like an atomic reaction. Mountains of ripping mass erupted from her already humungous muscles, trembling and expanding her body to colossal proportions, her feminine groans teeming with an incommensurable lust.

Petrified, Nathan saw the unthinkable. Her column-thick arms kept enlarging until they slowly began to stretch, her fingers sinking on the metal as the pipe bent before the two forklifts creaked and rose from the ground.

"Urrrrr... YEEES!"

She positioned the pipe above her chest, the prodigious fem-pecs protruding so high that Nathan couldn't see her face anymore.

"It's time to become a goddess"

As she slowly forced it up again, her nipples popped on the ripped surface of her chest. The energy inside her blasted like a dam break, pouring her body with pure, incommensurable power. She trembled vigorously, grunting as her fem-pecs emerged, wider and wider by the second, her impenetrable abs quickly expanding along with it, each muscle of her 6-pack bigger than apples, then bigger than grapefruits. Lying down, it wasn't clear, but she was getting taller, frightening taller, the metal structure of the conveyor belt warping under her freakish size. When she finished raising the pipe, her biceps and triceps were pulsating, bigger than watermelons, their unnatural veins thicker than whiteboard pens.

"One"

She lowered the pipe without letting the forklifts touch the ground, and started to raise them again. Her greedy eyes were glowing madly as mounts and mounts of rock-hard flesh embraced her neck, her shoulders broadening into immense shredded orbs while her gargantuan traps kept emerging, a monstrous veiny mountain higher than her head, the delight of her hot, gigantic muscles pressing against each other almost unbearable. Nathan watched in utter thrill and dread the rigid mass of her expanding legs engulfing him, the thighs becoming so massive that they began to push his torso up.

His body reacted to the constriction, his muscles bulging and expanding, but nowhere near what he suddenly realized he needed. So engrossed in her unbridled growth, Celine didn't seem to notice that she was crushing Nathan.

The dangerous situation, however, was arousing him even more, the increasing grip of her mighty pussy on his manmeat giving him new peaks of pleasure he couldn't even conceive.

"Two"

She lowered her arms and started again, faster than before. Feeling the pressure escalating, quickly turning into pain, Nathan senses prevailed enough time for him to desperately reach a sealed package of raw material that was next to him, dragging it closer with such eagerness as if his life depended on it. And maybe it really did.

It was his muscles' time to react. Grasping it with both hands, he used all his strength to raise it above his head, his muscles reacting with a whopping surge of mass.

All his muscles.

Celine suddenly halted the rep midway, her eyebrows arching as her mouth opened in a silent scream, the immense improvised barbell pending, almost losing balance.

"He's... Growing inside me..."

She crushed the iron pipe with her fingers, shuddering majestically as his massive cock stretched her love canal. Seeing it working, he continued. With each military press, his body grew, bigger, stronger, driven by the commanding effect that his superior phallus was having on her, the most powerful penis that ever existed. And it kept growing, longer, thicker, each pulse of his magnificent girth sending torrential waves of ecstasy to both Nathan and Celine.

She panted heavily, her breathing brimming with desire. The insane pleasure was making her even hungrier for more power. She resumed her bench press, her muscles exploding with growth.

Feeling her expanding even faster than before, Nathan doubled the effort, his immense arms burning with the frenetic reps.

There was only the adrenaline, the pain, the power. They grew, rep after rep, the sexual connection between them fueling their transformation, evolving their bodies beyond any human boundaries.

Nathan gasped for air, for lucidity, but he knew he couldn't control himself anymore; the urge to pound that godly body became simply irresistible.

Making a herculean struggle, he backed his hips, pulling off enough of his gigantic pole to pound her with a vigorous thrust.

Celine moaned, so deep, so feminine, so inviting.

He did it again, his thoughts screaming at him to fuck his naughty housemate as hard as he could. It didn't matter if she would become an unstoppable behemoth of muscle and power; in his mind, he was finally teaching her a lesson he had longed to give her.

In a lust frenzy, he threw the package away and plunged his fingers into her hips.

Even overcome by pleasure, Celine realized that she had him in her hands for good. The waist lock was no longer necessary.

His cock throbbed ravenously as Nathan felt her legs loosening around him. A ragged breath came out of his lungs and, as if he had been possessed, he began to furiously bang Celine.

She moaned profusely, the pure essence of femininity coming out of her mouth like a celestial choir, melting Nathan's ears. The exhilarating stimulus was building up, the reps going up and down faster, her body getting so immense that the space between then and the forklifts vanished, her tremendous muscles pushing away the two heavy machines.

It was finally reached. The point that even Celine couldn't control her libido anymore.

The sight of the forklifts flying in the air before smashing on the plant's machinery displayed a fraction of her immensurable strength. With her hands free, she grabbed her swollen nipples, caressing them with unbridled passion.

"FUCK ME MORE! Urrrrrr..."

She grunted wildly, her thunderous cries of pleasure threatening to bring down the plant walls, her pussy clamping his cock with an unnatural strength as Nathan hammered it harder and harder. His jaw dropped as her muscles kept enlarging, the plethora of pleasure and sexual power enough to keep her growing.

Celine eyes blanked. She was seeing only flashes, delirious flashes of a new era, of her absolute dominance on Earth, her power beyond any mortal comprehension. Weapons, tanks, bombs, nothing could stop her, the enslaved humanity serving only to feed and please her, to make her bigger, and bigger, and bigger.

"I will consume everything! EVERYTHING!"

Her body tensed. All energy left channeled to her clit, compressing inside it like a black hole.

And, like the big bang itself, she came.

The explosion of power that blasted through her was so monumental that Nathan could feel it irradiating from her muscles, bulging and expanding around him like galaxies forming in a new universe, her moans of ecstasy the very call of infinite heavenly pleasures, every cell of her body electrified by pure erotic bliss.

Overwhelmed by the unearthly scene, sensing his inevitable climax, Nathan started pulling his dick out. He shivered with delight, mesmerized by the colossal pillar of flesh that was coming to view as more and more rigid, veiny mass came out of her pussy, until all of its 53cm [21 inches] were out, pulsating and coated with her sweet nectar.

He grunted, a feral, primal shout as the first convulsion of his orgasm made his monstrous schlong dart back and slap on his chest, just below his chin, sending up like a geyser a massive stream of semen, so thick that it could be seen floating in the air before falling down on Celine's abs.

Using both hands, he lowered the shaft and aimed the baseball-sized head on her divine body. Another huge shot of spunk hit the left side of her humungous fem-pecs, then another creamed the right side. He kept cumming, load after load, covering her pillar-thick thighs, her protruding shoulders, her beach ball-sized biceps, his hands holding firmly the veiny pole in order to tame its raging spasms. He groaned harsher, unashamedly, the voracity of his orgasm giving him the utmost feeling of virility and supremacy.

This feeling, however, didn't last long.

Recovered from her ecstasy, Celine raised her back just enough to see Nathan. A jet of jizz had hit her angelical face, a pearled line shining on her left cheek.

"How dare you cum on me!?"

Nathan instinctively stepped back as Celine started to stand her titanic body up. Smashing the floor with her feet, she rose, and rose, her mountainous muscles bulging with each move, her long brown hair cascading on the seemed endless surface of her gargantuan traps and back until she stood straight, her 4.84m [15 feet 10] making her the most glorious and menacing sight he had ever seen. Her angry eyes looking down at him made him feel like an insect on the brink of being squashed.

Her stomach suddenly growled, louder, more insatiable than ever.

"You're lucky that I'm still hungry"

She gazed to the tanks, tons of Ready Shake just waiting for her. Her expression softened, a hint of unlimited eagerness blossoming on her face in the form of a subtle grin.

"Now, what flavor should I try next?"