Jim stepped out of his pants and underwear and took off his shirt. He decided to test different things with the balloon, controlling them and letting them go to see the extent that it could go to.
“Control the size of my penis and balls,” he said. He held the balloon up to his mouth and blew hard into it. His genitals swelled up to well over a foot long. Putting another two breaths into the balloon, blowing it up to its maximum size, his cock grew to three and a half feet long, with balls almost the size of basketballs. “Release,” he said, and he let the balloon deflate. It was large enough now that even just walking would be difficult and pants would be entirely impossible.
He inflated the balloon back to full. “Control the size of my penis and balls,” he said for the third time, and then slowly let the balloon deflate to empty, which got him to the six inches that he’d set as the new cap. “Release.”
“Control my age,” he said. He took a deep breath and huffed it out into the balloon. Immediately, his height shot up, and he felt around his face. He was starting to get the beginnings of facial hair and body hair, and his genitals had increased in size again. He started to get a bit of a boner, his cock beginning to rise. He got out his phone and looked at his own face using the camera app. He appeared to be about 15 or 16 now. He took another deep breath and blew it up again. As his growth had given him bigger lungs, he grew by even more this time, maturing even further, and by his estimation from his face in the camera app, he was now about 21 or 22. “Release.”
He looked over his body. His chest and groin were carpeted in dark brown hair, with a treasure trail leading between them down his stomach. He appeared to have a fashionable beard and a rather muscular body. His dick, however, stood out. It was, as far as averages go, huge—almost 9 inches long soft, he estimated, though now it was hardening again and almost 11 inches. Then he had an idea.
“Increase my libido and my penis’s sensitivity,” Jim said. He took a deep breath and blew it into the balloon, then said, “Release.” Instantly, he felt the urge to either fuck someone or jack himself off. Seeing as there was a shortage of fuckable people around, he decided on the latter. He lay down on the floor and began stroking his own cock. Almost instantly, it got as hard as it was going to get, and the pleasure was immense. It was only a few seconds later that he blew his load onto his own belly, and then he went for another shot, ultimately loosing three loads of cum.
There was now a sizeable amount of cum on his belly. Huh. He hadn’t thought of how he’d remove it. Staying mostly lying down, he scooted over to his desk where he had a box of tissues, taking it down and scooting himself with the box over to his little wastepaper bin. He used the tissues to move the cum into the bin. “Problem solved,” he said, though he still felt a little gross.
He blew up the balloon again, but only by half a breath. “Control my libido and my penis’s sensitivity,” he said, and deflated the balloon. “Release.” The feeling when he’d cummed had been amazing and he definitely wanted to feel it again in the future, but he did want to change his body back. He blew up the balloon again. “Control my age.” He then slowly let the air in the balloon out until he was about 12 again. “Release,” he said before releasing any leftover air in the balloon.
Jim then put the balloon on his bed and gathered some clothes, grabbing a towel from the closet on the way to the bathroom. He wanted to have a shower to clean off any excess cum left on him, and when he got out he’d experiment some more.