As Ty and Dustin turned around, they spotted Jasper entering the locker room. Perfect, Ty thought. Jasper was fairly tall at around 6 feet, but mostly average otherwise. Ty and Dustin didn't know much about him, other than that he was on the school basketball team and played fairly well.
Jasper opened his locker to get out his practice clothes, which included his jersey, basketball shorts and cleats. However, once he opened the locker the spell went into effect on him, and began to randomly change him.
First, age. The spell had chosen to de-age Jasper by two years, effectively turning him into a freshman at 14 years old again. Though it did not change much for Jasper due to his early puberty, his facial features did get noticeably younger and more boyish. Jasper didn't notice though, he continued to put on his jersey.
As he tugged off his pants and reached for his basketball shorts, the second part of the spell went into effect. It had randomly chosen a fairly middling number, 10, for the amount of inches Jasper was to grow taller. Ty didn't mind though, at Jasper's current height that would make him 6'10", which was still extremely tall.
Jasper managed to put on his basketball shorts, then stood back afterward. Unfortunately, he hit the ceiling light with his head. Simultaneously, he heard a ripping sound. Ty nearly died laughing when Jasper, clueless to his growth, curiously looked up at the light for a moment. Then he shook it off. The light must be lower today, he thought. He ignored the ripping.
Ty however, could see the real reason. Jasper's jersey which previously hung off his body now was several inches too short and exposed Jasper's midriff for all to see. Jasper's shorts looked much tighter and shorter as well, though they still remained fairly loose as they were basketball shorts after all. Looking down, Ty saw that Jasper's feet had grown in the transformation and had ripped through Jasper's shoes. So that must be the source of the ripping, he thought. Ty quickly amended the curse so that clothes would grow as well as the person, and watched as Jasper's jersey, shorts and shoes all mended themselves and grew several sizes larger to accommodate the now 6'10" Jasper.
The final part of the spell then went into effect, and it randomly chose 2x as the amount to boost his genitals by. Jasper's shorts began to bulge out as his cock began to reel out of his groin, and his balls began to inflate larger and larger. By the time Jasper's cock finished growing, Ty was sure that Jasper had no less than 14 inches of soft cock curled up behind the extremely large and noticeable bulge in the front of his shorts. His balls were equally impressive, each the size of a small volleyball.
Jasper picked up his stuff, still not noticing his changes, and headed for the door. He hit his head on the doorframe as he walked out, but didn't seem to care or notice. Ty burst out laughing as soon as he was gone.