The next thing Jason knew, his arms and legs started expanding with muscle. It was the strangest sensation to see his now-hairy body growing musclebound before his eyes. And that wasn't all that was growing... Jason felt a pressure between his legs as he became more and more male. Even though he was freaking out silently as he helplessly watched all this happen, Jason felt himself getting turned on too. It only seemed to speed up the transformations he was going through.
His shirt could take no more - the strain of jason's beefy pecs became too much and it started splitting down the sides, revealing long thick tufts of underarm hair. Then it started ripping right down the front of his shirt, and his thick shaggy chest hair sprung out for everyone to see. He had a good goatee growing on his chin, and stubble quickly growing out that would become a beard and moustache. Even the hair on his head was growing longer, it tickled his hot skin as it reached mid back.
I'm turning into a hairy hippie barbarian! Jason thought to himself. He couldn't help but be turned on more, because he had always had a fantasy of becoming this. But he was in the middle of class! What was he going to do?