As Ty walked through the mall, he saw another boy, around 16 - checking out the underwear selection of a sporting goods store. Specifically, he was looking at pairs of briefs. The range seemed pretty expansive - the store went all the way from small to an XXL, which looked positively enormous. Ty snickered as the boy selected a medium and walked back to the try on room. He quickly wished that the boy would outgrow that pair of briefs when he tried them on.
In the dressing room, the boy pulled on the medium briefs, and stood looking at the mirror. At first, he smiled but then moaned. Quickly, his balls began to pump up, swelling from the size of ping pong balls to the size of tennis balls. Then his cock began to lengthen, growing an additional 4 inches from its previous 3 inch soft size to 7 inches soft. When the growth was done, the underwear was stretched tight across the boy's endowment, and it was uncomfortable! The boy was groaning in pain, his penis was bound so tightly.
Quickly he ran back out to the shelves and pulled out the next size up, the large. When he pulled it on, he sighed in relief. The pouch was just big enough and it accentuated the large bulge nicely, but also gave him room. As the boy left the changing room, Ty snickered at the large mound at the front of his jeans.
Ty looked for another boy to grow...