Jim couldn't wait to get home to test out the balloon. He scanned around the mall for someone to try it out out on.
He quickly found the perfect target. Not far from him, a teen aged girl stood looking at outfits in a trendy clothing store. Jim had only just begun to find girls interesting, and this girl was very interesting to him. She looked cute dressed a white tank top and jean shorts. Though, Jim decided that she would look better with larger breasts.
"Okay," he said, as if he were preparing for a great leap. "Here we go." He held the balloon in his hand and said, "Control that girl's breast size." He waited a moment for some sign that the spell had worked, but there was no a tingle or hum or anything special. While keeping an eye on the girl's chest, he blew one breath into the balloon. Jim smiled, as her breasts visibly grew larger. He estimated that her chest had become a full cup size larger. Though, in his excitement at the change, he accidentally let the air slip out of the balloon, and her breasts shrank back to normal.
"Whoops," he said.
She didn't seem to have noticed the change, although she did discretely readjust her bra.
Jim tried again, this time blowing two breaths in the balloon, and again her breasts grew with each breath, expanding from A-cups to C-cups. She looked down at her chest, surprised to see a line of clevage where one had never been before. Jim blew another breath, expanding her chest once more. She stared wide-eyed as her now D-cup breasts painfully spilled over the top of her A-cup bra, streching out her tank top to the max. Her breasts appeared impossibly huge on her teen aged girl body, but Jim didn't care. He nearly drooled as he stared at her. Just as she was about to scream, Jim let the balloon deflate, but not all the way this time. He was careful to leave one full breath or air in the balloon.
"Relase," he said.
The girl touched her chest experimentally. Everything felt normal now, although she could swear that her bra felt a little too tight. She decided that either she had been seeing things or her hormones were really going crazy today. Maybe both. Still looking confused, she headed off to the underware racks to look for a new bra.
Tim smiled and chuckled to himself. This balloon was going to be more fun than he'd imagined.