Jim stood there at the food court and thought a moment. He decided that he really wanted to try out the balloon on himself, but not here. He left the mall and rode his bike home. When he entered his house, he called out to see if anyone was around. No one answered. He was alone. Perfect, they must all be out at one of his sister’s soccer games or something.
Jim ran up to his room, shut the door and closed the drapes. Even in an empty house, he wanted to keep this as private as possible. He pulled out the balloon and considered what to try changing first. The old man in the shop had already played around with his height. Maybe Jim would just try a single body part.
Suddenly it hit him, as his eyes drifted down to his crotch. At 12, he was just starting to enter puberty, and was starting to discover new feelings that would occur from his penis. He'd often wondered what it would feel like if it were bigger. Now he didn't have to just wonder... he held the balloon that would let him experience it! Jim considered taking off his pants before he started this experiment, but decided against it. Keeping his pants on would allow him to feel what it was like, he reasoned. Also, if anyone came into the room, it wasn't immediately obvious.
Jim was about to say the obvious 'control the size of my cock and balls' but then he had an idea - what if instead...
"Control how much my cock and balls swell in size per minute" Jim said, wondering if it would work. He drew in a breath, and blew into the balloon.
At first nothing happened. But then Jim started to feel like his underwear was getting tighter! Pinching the neck of the balloon and watching the mirror, Jim whispered "release" and let the air out as the feeling continued. It felt like he was getting an erection, except he wasn't getting hard!
Immediately pulling down his shorts, Jim could already see in the mirror that his underwear seemed to be slowly filling out. It had already reached its limit and was beginning to strain to cover Jim's growing penis. Quickly thinking, Jim said "control the size of the pouch on my underwear!" and blew into the balloon. Exhaling as the tightness temporarily loosed, he watched as the underwear relaxed, but didn't shrink back. Instead it continued to expand! "Release" he said, in awe.
Pulling his shorts back up, Jim noticed that the front of his shorts was starting to show a familiar bulge. Quickly, he ran downstairs to grab the ruler in case he needed it, and he could feel the new weight in his groin. His loosened underwear was already starting to tighten again! Throwing open the office door, he searched through the shelves, but couldn't find the ruler. Where was it?
As he searched, Jim was aware that his underwear was continuing to get tighter. Even his expansion had been caught up to by his growth. What was it now? Could he stop the growth for a second until he found it? Jim realized he had left the balloon in his room. He was stuck slowly growing until he found that ruler! He continued his search.