Jim decided to test his 'growing in just his underwear' theory.
SO he got his clothes back off again, and stood in his underwear.
he held the balloon and said, "Control my size, underwear size, and balloon size."
Jim took a deep breath and inflated the balloon. FFFFOOOOOOFFFFF.
With the first breath, Jim felt a little dizzy as he shot up 6 inches in height. At 5'5", Jim was now taller than most of his classmates at school. Before blowing into the balloon again Jim check himself in the mirror and noticed that despite being taller, his proportions remained the same and his undies grew with him. Satisfied that it worked, Jim blew into the balloon again.
With another breath, Jim shot 6 inches in height to 5'11". As tall as his dad and the height that the old man made him when he demonstrated the balloon to Jim. Despite being as tall as a grown man now, Jim was not satisfied and so blew into the balloon again.
With another breath, Jim shot up 7 inches to become 6'6". As tall as most basketball players. As big as Jim was now, he was not done yet and so took one smaller breath than before.
With that last breath, Jim shot up 6 more inches and became 7 feet tall. With that, Jim took a look around. Everything in his room now seemed so small to him, and the ceiling seemed so much closer. Jim realized that if he stayed this way, he would probably the tallest 12 year old alive. However he would probably be seen as a freak and would never live a normal life. He wanted to be bigger, but this was maybe too big. So Jim eased his grip on the balloon slightly.
Jim's perspective dropped as he began to shrink back down. Jim found it rather fascinating as everything seemed to grow around him. Within about 10 seconds he was back to the height before he used the balloon to get bigger.
Satisfied, Jim decided to try the balloon on someone else.
but who