Big, mean and stocky Leon was who you decided to go with.
Leon was above all else known across school for his attitude, temper, and reckless nature. If anyone ever dared Leon to go do something, chances were he was not only going to do it, but then come back to rub it in the person's face. In terms of looks, Leon had a handsome if somewhat rounded face, framed by light brown hair. He seemed to have some trouble with facial hair even when his body was rather hirsute otherwise. His eyes were icy blue, and complimented a consistently arrogant smirk.
Most students looked at Leon and saw his huge physique - standing almost 250 or even 260 lbs and six foot four inches tall, Leon was incredibly muscular everywhere, wide imposing shoulders to bash people out of his way and a set of thick, strong arms to move anyone his shoulders didn't move. The only area on him that wasn't muscled and toned was Leon's stomach; according to those who knew him, Leon was voracious. Nothing in the cafeteria existed that Leon would not gorge himself on. He as a result had a prodigious gut and his pecs seemed to push forward a bit, almost looking like moobs at times (though none would dare say such to Leon's face).
It was the shoulders that came in first.
You feel your whole body thicken and your shoulders mold into the shape of Leon's huge decimators, leading into the arms, which thicken and strengthen to an insane degree. You flex your arms and gasp, every instant pumping the bicep and tricep further and further.
Are those...twenty inchers?
Your new sleeve shredders true to form obliterate your shirt sleeves and you watch as your shirt reforms into a ragged sleeveless shirt. Even though Leon came from a wealthy enough family, he seemed to prefer these ragged shirts.
You groan as you feel your back stretch and strengthen, widening in tune with the rest of you. You let out a moan as your stomach and chest combat one another, growing out, further and further as your legs race to keep up so as to keep you on your feet.
You feel your face changing, thickening, rounding out from a handsome look into the brutish features of Leon. You open your eyes and find yourself staring at the form of Leon, more or less, almost taking a step backward expecting the Leon in the mirror to come forward to beat you up...except...now you ARE Leon.
You feel a sudden harsh tingling sensation inside your boxers and grunt angrily, crashing a fist into the wall and feeling at your groin. Even as you feel your manhood lengthen and become more sensuous, longer and more gifted you feel something else. Your balls...are shrinking. This supplies a bit of a revelation about Leon's true origin for his musculature and nasty temperament.
"Ahh fuck, Leon's a roid-head..." You rub your forehead, just thinking about it starts to get you pissed off...aww shit, you realize, there's the steroid temper. How, you wonder as you fume to yourself, trying to keep away from others, does Leon handle this? You could wreck a whole locker this temper's so nasty.
It takes a moment's breath to get you back under control, and your mind is now thinking of what else you could do with this body.
Your eyes go to your groin again, "...Wonder what that feels like..."
But any intention you might've had to sensuously enjoy yourself is cut short when you look to the side from the mirror and see---who else?---Leon. Standing there, staring at you, looking at you up and down. You and he stare at one another for a good moment before Leon says outloud, "...Am I dreaming? Or do you look exactly like me?"