While Ty and Dustin were enjoying the sight of their male cohorts growing massively, another guy came in through the back of the locker room. His name was brad, he stood at 6"2, but was completely devoid of any muscle. However, his popularity at school stemmed from the fact that he had a hormonal condition that had caused his cock to be bigger than huge his whole life. It was called pubescent hypertrophy, and the symptoms included random growth spurts, the likes of which Ty and Dustin had never seen. As brad snuck around behind Ty, he thought it would be funny to pantse him, as he had seen what had happened to other guys who shed their layers. He got down and quickly shoved Ty's shorts and underwear down to his knees. Ty whipped around in surprise, only to find Brad howling with laugher. Ty realized that he would start to grow too, but as the thought reached his mind his coco began to tingle. Like many other guys, it swelled and swelled like a balloon until it hung to below his knees, a gigantic hose bigger than a pipe, with balls than stretched his sack to the size of a basketball. He quickly pulled up his underwear in an attempt to conceal it, and ran to the bathroom with Dustin at his heels. Brad was amused by what had happened, but as his laugh tapered off he felt the infamous tingling that meant one of his hypertrophic growth spurts was coming. He looked down and could already see his jeans stretching outwards. He made his way to the bathroom, and could hear Ty and Dustin whispering hastily. He went into the handicap stall and locked the door. He quickly glanced down to his package and saw the entire front of his jeans was rapidly filling with meat. He sat down on the toilet cover, which only made his swelling package seem bigger. He knew from experience there was only one way to stop it. He undid his belt and fly and let his white cotton briefs free. The sudden release of restraint caused his ballooning privates to bulge outwards. He knew there was only one way to stop it. He pulled down his briefs and let his massive member flop forth.