Ty felt his own crotch starting to bulge, and he knew that things were far too easy on Dustin. Dustin needed some tougher choices, so Ty arranged for Dustin's cock and balls to shrink if they weren't growing.
Dustin felt a coolness settle between his legs -- a welcome change from the warmth of his earlier growth. The shorts loosened as his balls slowly deflated to a giant but less-freakish size. For a full minute, Dustin relaxed a nice, oversized package filled out his clothes. Perhaps Ty had gotten tired of playing, and was fulfilling the original foot-long dick request.
For the next minute, Dustin felt his balls continue to contract while his dick snaked downwards, shorter and thinner. Was Ty returning him to his original size? Dustin furtively felt his dwindling equipment as it passed below its starting size. Damn! Ty was still fucking with him! Now he had a four-inch prick, soon to be three.