As Ty and Dustin turned around, they spotted Coby entering the locker room. Perfect, Ty thought. Cody was average at around 5'6". Ty and Dustin didn't know much about him, other than that he was on the school basketball team and played okay, but not the greatest.
Coby 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 one year, which didn't really do much, though Coby did lose two inches of height. He shrank to just 5'4".
As he tugged off his pants and reached for his basketball shorts, the second part of the spell went into effect. Ty was shocked to see that it had chosen a fairly high number. Any loss of height Coby had was instantly regained, as he shot up 20 inches to 7' even. Coby stumbled a bit from the sudden growth, but managed to stay standing. Coby's jersey which previously hung off his body now was several inches too short and exposed Coby's midriff for all to see. Coby'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 Coby's feet had grown in the transformation and had ripped through Coby'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 Coby's jersey, shorts and shoes all mended themselves and grew several sizes larger to accommodate the now 7' Coby.
The final part of the spell then went into effect, and it randomly chose 3x as the amount to boost his genitals by. Coby'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 Coby's cock finished growing, Ty was sure that Coby had no less than 17 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.
Coby 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.