Zach was just sitting doing some work on his computer - he was thinking about not just the work in the class, but the work he was due to do today for his AP Classes, and the undertakings his hacker friends were setting out to do. He didn't notice the teacher giving him an odd look, and in the moment, he didn't feel the telltale start of a tingling sensation spread out across his body. His body speaking of which was almost typically nerdy - he tried to do some physical exercises, but all it did was keep him thin.
This was beginning to change.
His arms and shoulders thickened one after the other, one seeming to in turn bring out more strength and size in the other. He rolled his shoulders and breathed harshly, not taking his eyes off his computer and the work for the class. He felt an irritating sensation as his back widened and strengthened, lats pulling out and pushing at his shirt, making him grunt.
His forearms should've been something he noticed changing, strengthening and bulging with size, becoming the forearms of a man, but he kept his attention to the screen rather than the meaty hands and forearms helping him type.
He figured it was a jock that made that noise, because it surely COULDN'T have been him, small, nerdy Zach, making that low grunt.
Zach started stretching his legs and changing their position even as he kept trying to concentrate, quads and thighs bulging with sheer muscular strength. He grunted again when he felt something like his cock and balls get pushed around - mostly by his increasingly tight underwear. Zach, who had always considered himself a small man in terms of endowment, now had an eight incher stuffed away in his tight pants.
His glutes expanding almost made him moan, and he swore he'd need to---to take care of this whenever he had the apt opportunity. He wished he was at a point where these bothersome, distracting erections stopped bothering him so much. He had the glutes of a physique bodybuilder, and he hardly noticed them.
Even as he aged further and his body kept changing, kept perfecting itself further, he kept his attention to the screen, figuring it was just his clothes being weird. He heard people chattering around him and turned his head to look at one of the jocks. Was Tommy the Swimmer always that short? "Tom, listen, whatever you're goin' on about, can you keep it down? Some of us are trying to pay attention to the lecture. I know I want to graduate on academic merits."
Tom just stared at him and Zach went back to work.
Zach didn't even notice as his hairline started to decline, his bodybuilder physique staying as deeply impressive as it always was. Mild lines started forming at certain spots on his face, accentuating his maturity and strong history rather than making him look withered. His features if anything were even stronger than ever; a powerful, angular face and his old blue eyes now looked fierce and powerful...
...but Zach for his part still carried himself like a teenaged computer geek. So focused was he on the lesson and his computer. Once class was done, Zach got up and stretched, wincing when he heard his shirt rip near the back. He swore he'd need to get something bigger...
Ms. Clarkson suddenly called out to him, "E-Excuse me, Zach, do you think I could talk to you for a moment?" Was she acting shy toward him? Toward HIM!? Or...maybe she had some bad news...
Zach gulped, hoping he was not in any kind of trouble. His shirt was really feeling way too fucking tight, and he was really hoping he could just get going so he could eventually get home and change clothes. "Uhh yeah, Ms. Clarkson? Is there something uh wrong with my work?"
Rebecca seemed to look at him for a moment and...