As Ty and Dustin watched, the bell rang for the end of the day, and a few minutes later, another basketball player entered the locker room. His name was Matthew.
Matthew was an average height basketball player, at 5'11" and but he possessed a nice-sized dick at 7 inches soft, and 9 inches hard. Well, for now anyway.
Matthew opened his locker and sat down to change into his uniform for after-school practice. As he pulled off his shorts, he began to feel a tingling feeling in his crotch.
"Why does my dick feel s- UGHHHHHH"
Matthew's briefs pushed outwards as his cock stretched out longer and longer. It ballooned out until it looked like a soccer ball in his crotch. Matthew's new 17 inch cock was clearly outlined in the thin brief material. He stared down at it.
Seeing this, Ty got an idea. He wished that all of the guys in the locker room would now gain 1 feet of cock in their crotch instead of 10 inches, and that this also affected every boy already changed by the locker room.
Matthew felt the sensation again, and his dick began to bow out even more. It finished it's growth quickly however, since it only grew 2 more inches, stopping at a massive 19 inches.