As fun as it was to see himself as a little kid again, Jim really wanted to find out what he would look like when he was a grown up.
He put the balloon to his lips and started blowing deep breaths into it. FOOOOOOOOOOFFF... FFOOOOOOOFFFF...
In the mirror, he could see his body growing older again. His naked legs stretched out and thickened as his face became more mature and less rounded. Soon, he was back to his normal age of 12. He paused briefly to catch his breath and to get reacquainted with his regular body again before growing older.
Jim smiled and said to his familiar reflection, “Here goes nothing.”
He took a deep breath and exhaled it into the balloon. FFOOOOOOOOOOOFFFF. His height shot up suddenly and his shoulders broadened as has he rapidly passed through puberty. That breath had made him two years older. He guessed he had become almost half a foot taller with that last growth spurt.
“Cool,” he said in a deeper teenaged voice. “Looks like I finally get to be more than a shrimp.”
His T-shirt was now stretched tight over his torso, showing off the first signs of muscle growth beneath it. Looking down, he could see that his formerly bare crotch and legs were getting hairy and his member was looking much larger.
He wanted more.
FOOOOOOOOOOOFFFFFFFFF.
Again, he felt himself shoot upwards as the balloon expanded, though not as much this time. Looking at his face in the mirror, Jim hardly recognized himself. He looked more like a man than a boy now. His face even showed signs of stubble. Jim guessed he was in his later teens, an upper classman in high school. The T-shirt he wore felt painted on to his expanded torso and thickened arms. Again, he checked out his crotch to see that it had become a real monster. He smiled.
“Hey, Big Guy, looking good,” he said in a manly voice. Admiring himself in the mirror, he stared striking bodybuilder poses in order to check out his new muscles.
But then, He had an idea.
If it could make him a teenager, could it make him into a grownup?
Only one way to find that out!
He took a deep breath and blew into the balloon.
FOOOOOOOOOOOFFFFFFFFF.
Again, he felt himself shoot upwards as the balloon expanded.
Jim seemed to be getting older.
Jim grew older, as the balloon inflated more and more and more.
He grew to 18... to 20... to 25... to 28, and kept on growing older till he was roughly around 32 years old - a grownup man.
He glanced at his reflection in the mirror.
His kid self's shirt was reduced to a tattered looking waistcoat.
He saw that he was now 5'11". As tall as his dad and the height that the old man made him when he demonstrated the balloon to him.
He found his brown hair looked rather shaggy, and he'd also gained a trucker-style beard. And he had some muscle on him.
And, He now had the penis of a full grown adult, 7 inches soft and surrounded by a thick bush of pubes.
"Wow." He said, in a deep, gruff, voice. "This must be what it's like to be grown up, and what I'm gonna look like as a grownup. "
He wriggled his grownup toes.
He thought of bringing himself back to normal.
But first, he thought of wanting to experience his new grownup look.
He also wondered if the balloon could inflate, grow, or shrink his grownup body.
Decisions, decisions.
What to do.