"...stupid, horny little boy!"
The room swam around John as the magic took ahold of him. Immediately, his pants dropped to his ankles as he suddenly shrank. His hairy legs were already growing smooth and he looked down in shock. He lifted his increasingly oversized shirt and watched as his crotch followed suit, his inexplicably hard cock slowly growing smaller before his eyes.
"How could you do this to me!" he said, his voice already raised to a teenage tenor.
"Really easily I guess," Katie said smugly, eying his diminished member.
"This is never gonna work, not like if you'd made me a dog or something," he said, a childish whine creeping into his still higher pitched voice.
"Yeah it is, I can feel it," she shot back. "Everyone will believe you're my little cousin from across the country, staying with me for a while."
"What's that gonna accomplish?" Johnny whined, with a slight crack in his boyish new voice.
"Well, you're gonna have to accept a new, smaller place in life. And you'll have to be reeeal careful. Seems my 'cousin' is a D student, and is on probation for shoplifting. Any slipups and you'll end up in a remedial school across town, or juvie."
Johnny looked at her dumbfounded. And then he slowly came aware of another problem....
His dick was maybe 4" long hard, and only had a couple hairs, but it was harder than it'd ever been. He was starting to feel like he needed it, and bad.
Katie just laughed again.
"I hear you're pretty popular in your school, you little horndog. Even though, or maybe because, you're the smallest kid in the 8th grade."
He could barely resist wanking it right then and there.
"Did I mention it's an all boy's school?"
He just whimpered in response.