Jim stared in the mirror at his grade school age self. It was cool to be this young again, but he wanted to make some changes if he was like this!
First - his boyhood had shrunk as part of the age reversal process. That wouldn’t do. “Control my cock size” he said as he brought the balloon to his lips. He blew a single breath into the balloon.
FWOOOOF. His lungs were smaller, but it was still enough. As he watched, his underwear, very loose as he had gotten smaller from de-aging, tighten in the groin area. Smiling, he blew one more time.
FWOOOOOF. Once again his bulge expanded and now looked like something one might expect on a high schooler. Smiling even wider, Jim thought about stopping there, but then... nope.
FWOOOOOOF. His cock grew to be six inches long soft. Now his underwear, despite being originally loose when he shrunk down, was starting to struggle to contain his growing manhood. Suddenly Jim had a funny idea. “Release” he whispered, “control the size of my underwear” and began to slowly let air out of the balloon.
Slowly but surely, he felt his underwear grow tighter on his bulge as it became the correct waist size for an eight year old, albeit one with an average-sized boyhood. Jim’s bulge looked ridiculous on his eight year old’s body