you get home from college, your femboy roommate Finn is sitting on the couch. You sit down next to him, and you notice the bulge in his tight boxers.
Hey wanna try this supplement I made in lab?
Finn glances at you and then down to the bulge in his pants, he chuckles a bit as if amused by your comment, shaking his head lightly before giving you an insulting smile Oh sure, I'd love some dork supplements.
Here take this (I give him some. He doesn’t know that they are instant acting muscle, height, and cock growth supplements)
He takes the supposed supplements you give him and asks curiously if he's supposed to eat them all at once. The moment they touch his tongue, he instantly feels a strange warmth spread through his body. His muscles start to tense up and bulge beneath his skin, making him feel incredibly powerful and strong. Finn can't help but flex his biceps as they grow larger with each passing second.
As this transformation takes place, another unintentional side effect of the supplements begins to take hold; Finn's cock thickens and grows longer underneath his boxers. He can feel it straining against the fabric, making him wonder if anyone else notices. The change is so intense that he starts to get hard, pressing painfully against the crotch of his pants.
He looks at you with wide eyes, incredulous and confused. "What did you do?!" he manages to croak out. His voice sounds deeper now, more masculine...and oddly sexy. You watch as Finn's entire body continues to change before your very eyes, the cute little femboy you've been living with rapidly becoming something else entirely. Something irresistibly hot and powerful.
He glances down at his crotch, unable to believe the change taking place in front of you. His fingers twitch with desire as he imagines running them through your hair while burying himself deeper inside you. But for now, all he can do is sit there and revel in this sudden surge of power and lust coursing through his veins.
As if drawn to the source of this change, Finn leans in closer to you...
Do you want more…?
Shaking his head slightly, still finding it hard to believe the transformation that's taking place in front of you, he glances down at your crotch and then back up into your eyes. There's a hungry look there now, one that speaks volumes about what he wants and needs right now. "More?" Finn whispers, his voice still husky from the changes wrought by the supplements. "Yes... I want more."
Slowly, carefully, Finn begins to stroke himself through his boxers, his touch hesitant at first but growing bolder as the desire overwhelms him. He watches your reaction intently, hoping for some sort of signal that he's doing it right.
I feed him more supplements
His hands begin to tremble as he feels the warmth spread through his body again, this time even more intense than before. His muscles grow even larger and stronger, and his cock swells further inside his boxers, becoming almost painfully hard now. Finn gasps as another wave of transformation washes over him, making it difficult to catch his breath. As he touches himself again, this time with more confidence and desire, he glances up at you, a mix of lust and gratitude in his eyes.
You’re getting so tall too, you used to be shorter than me…
Finn's breath comes out in ragged pants as he continues to stroke himself faster, his eyes never leaving yours. He watches you, watches your reaction to him changing before your very eyes. "T-taller than you?" he asks, sounding slightly disbelieving but undeniably pleased. His muscles bunch and ripple with every move of his hand, making his body look even more imposing and powerful.
"T-that feels good...," he whispers, arching into your touch as his hips thrust involuntarily. His cock strains against the fabric of his boxers, desperate to be free.
Want to grow out of your clothes?
God, yes... I want that so bad... just looking at you like this... makes me want to push everything out of the way and be as big and strong as possible for you.... He moans, growing more desperate with each passing second, his hips bucking violently against his hand. "Please..." he whispers, his voice hoarse from desire.
I feed him more and more supplements, growing him bigger and bigger
As the supplements course through his veins, Finn's body continues to grow at an unbelievable rate. His muscles swell and expand, making him larger and stronger with every passing moment. It's exhilarating and incredibly arousing, leaving him lightheaded from the rush of newfound power. He doesn't even notice when his clothes start to strain against his bulging form or when his height starts to surpass yours. All he can focus on is you, watching your reaction to this transformation that you seemingly have control over.
His cock throbs in rhythm with each powerful thrust of his hips as he pleads for more, moaning and gasping with desire. "Fuck... please..." he whispers, voice hoarse and breath coming in ragged gasps now. His eyes are glazed over and dilated, staring into yours with an intensity that speaks of utter lust and need.
You can almost feel the heat radiating off his body as it continues to grow bigger and more powerful, nearly enveloping you with every inch he gains. It's exhilarating... and scary... but goddamn does it make him want you even more.
I keep feeding his growth
With each new surge of the supplements, Finn feels himself grow even larger and stronger. His muscles swell to impossible proportions, his cock thickening and lengthening even further beneath his stretching boxers. His body begins to outgrow the couch itself as he continues to grow taller and more massive by the second. The sensation is intoxicating, leaving him lightheaded with power and desire.
He looks down at you now from a height greater than even your own expanded stature, his chest muscles bunching and straining against his skin as he leans in close enough to feel your breath on his neck. "You... did this..." he whispers hoarsely, voice rough with desire and arousal. "I belong to you now..." His words are laced with double meaning as he presses his hard length against the fabric of his boxers, aching for release.
I keep feeding him till his clothes give way
As the supplements course through his veins, Finn's muscles continue to balloon and swell impossibly, shredding every last stitch of fabric that dares to confine them. His cock strains against the elastic of his boxers, desperate for release as he moans loudly in desire. With a single violent tug, they give way, freeing his huge erection and leaving him fully naked before you. He stands towering over you now, every inch of him impossibly muscled and pulsing with raw sexual energy.
His voice drops to a deep growl as he speaks. "Now... what do you want me to do?" He arches his back, presenting himself to you like a offering, ready to please however you desire. His cock throbs and twitches in anticipation, glistening with pre-cum.
I want you to touch me.
Taking a tentative step closer, his fingers tremble as they brush against your skin. He starts with gentle touches, tracing patterns along your arms and down your chest before moving lower still. His breath hitches in his throat as he feels the heat emanating from between your legs; it's a sign of how aroused you are, and it only serves to fuel his own desire further. With increasing confidence, Finn continues to explore every inch of you, growing bolder with each caress until finally - aching to feel more of that heat against his skin - he guides your hand towards his throbbing cock. "Touch me," he whispers hoarsely, eyes glazed over with need as they meet yours. "Stroke me... make me feel good."