Ty spotted another boy in the aisles, shopping for basketball high tops. He looked like he was into playing the sport, but he was fairly short for his age, only around 5'4" and 14 years old. Suddenly Ty had a funny idea. He wished first that the boy would be unaware of any transformation. Then he wished that every time the boy tried on a basketball hightop, the boy's feet would grow just large enough to be slightly uncomfortable in the shoe. In addition, he wished that the boy would also grow taller and slightly more muscular every time this happened in proportion for his shoe size. Then Ty settled in to watch the show.
The boy first checked the tag on his own shoes, seeing that they were Size 6. Pulling the Size 6 basketball high tops off the wall, the boy fit his foot inside and tied the laces. However, before he could get the other shoe on, the boy moaned quietly. Ty watched in amazement as the boy stretched an inch taller, but he couldn't see any other differences. Yet, he reminded himself.
Confused but uncomfortable at the tight fit, the boy pulled off the Size 6 shoe, put it back and pulled down the Size 7. Again, he put his foot in the shoe and laced it up, sighing in relief.
Then a second later, the boy moaned quietly again. This time the effect was more noticeable, as Ty watched the boy gained a few inches of height. The now 5'8" boy, annoyed that the shoes were still tight, pulled off the Size 7 and picked up the Size 8. Except he did it wrong, and accidentally picked up the Size 9s instead! As he bent down, Ty noted the slight bulge that was showing at the front of the boy's shorts. He grinned, but felt impatient. If the boy was going to go up one size every time, this would take all day! So he wished for the effects to double every time the boy put his shoe on.
Just in time too. The boy laced up his Size 9 high tops and the spell went to work as soon as he stood up, but much more powerful! The boy moaned louder as he suddenly sprouted eight more inches, going to 6'4"! The boy's now Size-10 feet strained the seams of the Size 9 shoe, and he hustled to quickly remove it before he burst out of them.
This time, the boy grabbed the Size 10 high tops, and Ty wished they would fit perfectly. Lacing them up, Ty grinned. He looked like a gangly kid, with a young face but much taller, and with large hands and feet to boot. Suddenly, Ty realized that something was missing, but what... oh right, the boy was still left with his average cock. Ty couldn't do that. He chuckled at the thought that he just couldn't leave someone average. But he wanted to make this fun. Ty wished the boy would try on a jockstrap in the store.
Absentmindedly the boy walked over to the aisle, and chose a large sized jockstrap. Walking back to the change room, he quickly removed his shorts and pulled up the jockstrap over his average cock and balls. Once he had it on and was admiring it in the mirror, Ty immediately wished for the boy's cock and balls to double in size.
Immediately the boy moaned as his cock began to swell, pushing the loose fabric out more and more and creating a larger cock outline. Bigger and bigger it inflated, passing 5 inches soft, then 6 and finally settling on 7 soft inches of schlong hanging from the boy's groin. Then the boy's balls began to swell, stretching the fabric even more as they grew from the size of grapes to the size of tennis balls. Now the fabric of the jockstrap was stretching to contain the boy's massive manhood. The boy just smiled and pulled his shorts back up. Now there was a definite bubble in the front. The boy walked out of the store whistling, completely unaware that he had grown a foot taller and doubled his package.