Tom looked at his friend and wanted to believe him. Finally he decided that he'd already gone this far, he might as well get it over with. "Alright. Could you please shrink my genitals?"
"Um... what?" Jim said sure that he hadn't heard Tom correctly. What guy would want that?
"My genitals. Can you please make them smaller?"
"Dude, why?" Jim asked.
"See. I knew you'd think I was a freak." Tom said turning away from Jim so he wouldn't see him trying to hold back tears.
"No, no, no. It's not that. I just don't understand why you would want that." Jim tried to reassure his friend.
"I've just never really liked them. They've always looked weird to me like they didn't belong there or something." Tom said.
"So wait. How small do you want me to make them?" Jim said starting to inflate the balloon.
"I don't know. Blow it up really big and start letting the air out slowly. I'll tell you when to stop."
"Okay." Jim said between breaths. When the balloon was about as big as it could get Jim stopped inflating it. "Are you ready?"
"Wait just a second." Tom said starting to undo his pants.
"Whoa, wait a second. What are you doing?" Jim asked.
"What? I've got to be able to see it if I'm going to be able to tell you when to stop." Tom said.
"Alright, you've got a point." When Tom has stepped out of his pants and underwear, Jim asked "Ready now?"
Tom nodded his ascent.
"Control the size of Tom's Genitals." Jim said and slowly began letting air out of the balloon.
At first it looked like nothing was happening; Tom's penis appeared to be about the same size. They both realized that that was an optical illusion caused by his penis growing into an erection at the same rate it was being shrunk by the balloon's magic. Soon it was fully hard but still the same size it had been when it was soft.
"Can you let the air out faster?" Tom asked.
Jim only nodded releasing more air from the balloon as both boys stared in fascination at Tom's quickly shrinking penis.
Tom's penis was soon the size it had been right before he'd entered puberty, then it was even smaller than that.
"Are you ever going to ask me to stop?" Jim asked his friend as his penis had shrunken to barely an inch long.
"I don't think I am." Tom answered still in awe at the magic he was experiencing.
When the balloon was fully deflated both boys looked as Tom's changed crotch. They couldn't clearly see his genitals at all. Tom brushed a hand through the patch of hair there until he found what he was looking for. His penis was now barely the size of a pea, perhaps 1/4 long. His testicles he couldn't really see at all though he could feel it when he touched them.
"That's pretty weird dude." Jim said. "I'm going to change you back." He brought the balloon to his lips about to begin inflating it when Tom stopped him.
"Wait. Don't do that. I want you to leave me like this." Tom said.
Jim lowered the balloon. "But dude. You look like a girl."
Tom thought about this a second and looked down at his crotch again. "Yeah, I guess you're right. I do kind of look like a girl down there. But for the first time in my life, my crotch looks right to me."
"Wait... Are you saying that you want to be a girl?"
"Well, I've never really thought about it like that before... but yeah, I think maybe I do."