Simply incredible!!!
Easily one one of the best stories i have read here or any other site hosting body builder stories.
The premise is just fantastic.
A teen/young adult male protagonist with a fetish for muscle women and yet has zero experience with any of them in real life.
Something terrible happens to him and he gets injured but those broken arms are probably the best thing which could have happened to him.
He is blessed with a monster cock which turned into a curse of the beginning of the story because of his broken arms.
And then you have Nurse Jackie: She is the most muscular person on this planet and she doesn't even realize it. You did not mention any direct measurements but the descriptions of muscles are more than enough to visualize her insane body. Traps when flexed which can reach her ears, biceps the size of freaking bowling balls and a back musculature which can hide her head.
Her body is big enough to literally engulf Billy and allows her to jack him off in a populated area while hiding him.
And yet despite of her insane body she is a is shy, insecure and kind amazon.
I was kinda unsure if she was putting up an act. She claims she never competed before, charming her coworkers despite being insecure near Billy, downplaying her size but you did described her inner feelings to us and the dreaded bait and switch never happened. Man i would have been mad if she was lying or if the whole story was a dream.
Anyway her obsession of building up her body warped her senses to the point she really believed the above points.
Those two have issues but this story allows them to meet and they are the perfect match for each other.
Billy found the person of his dreams. He who never has seen a proper fit women before meet the buffest and strongest person there is and she needs to take care of him and not only because of her job but because she sincere enjoys his company.
Jackie who is treated like an outcast meets a 100% honest worshiper. Someone who admires her body, appreciates her strict work ethos and gentle personality.
Each time they meet they open up to each other a little and help to understand each other wishes and desires.
And all of this finally culminates in Jackies home.
To impress her little admirer (Not little where it counts
) she proceed to pull of the most impressive workout in her life, smashing her own records left and right and probably set up a few guinness world records too if someone would have noted them down.
And then you go even further and reward us and Billy with a such hot flexing scene which might as well count as hulk out scene too since her muscles were fully pumped from those gruesome workouts and her giving her best to keep up that mammoth flex until Billy can no longer control himself despite being only an admirer of that workout while Jackie was pushes to her limits, both mentally and physically and yet she prevailed of her little Billy Boy.
I was saddened the story ends there but it's probably the best it ended on a such high note instead of being unnecessary dragged out.
I really hope you continue writing such wonderful fbb stories because i'm only aware of this one and Morning Wood and the latter was not really my cup of taste (I dislike hyper muscles and heights over 3 meters)