As the boy ran off the front desk, Ty was still chuckling when he realized - he'd never removed the spell from the jockstrap! That meant the boy was going to continue to grow when he put it back on, which he had when he went to front... Ty realized this and doubled over laughing even more.
Quickly walking out to the front but trying not to appear suspicious, Ty walked out just as the boy had finished paying for the jockstrap. Just for fun, Ty wished that the boy was not wearing sweatpants, but just regular basketball shorts over his new jock. Immediately, the sweatpants shortened and lightened to a pair of basketball shorts with the Nike logo on them. Of course, the front of the boy's shorts was bulging immensely, covering the boy's still-growing cock. By this point, it was long enough that it actually ran out of the jockstrap and down one of the boy's legs. And as Ty watched, it seemed to be slowly expanding.
Beaming with pride, the boy walked out of the store. Ty nearly doubled over in laughter when the boy's cock got so long that the head of his cock actually poked out of the leg of the shorts. Quickly he wished that no one would find it unusual and that the boy wouldn't find it awful. Ty watched amazed at the boy with the pendulous cock kept weaving through the crowd, his cock dangling out of the leg of his shorts without a care.
Eventually the boy walked into another store, this one being a general clothing store. He walked to the underwear section, taking time to look at the clothing with special pouches in the front. Selecting the biggest one, the boy walked back to the changing rooms.
Ty nearly whistled when the boy removed his shorts. The boy actually had to reel in his monstrous cock through the leg of his shorts, inch after inch. By now it reached to his knee! Carefully, the boy removed the jockstrap and fed his cock into the pouch of the new underwear. It was a tight fit, but the boy managed to pull the underwear up. Modesty was out of the question however, since the underwear held most of the boy's cock firmly out in front. It looked as if the boy had stuffed a basketball into his shorts. Ty didn't even bother transferring the spell to the boy's new underwear, he just stared at the bulge as the boy left the rooms.