"I want to be big," Jon grinned.
"Okay then," smiled Karyn back. "I wish that, for the next hour, Jon was as old as me."
A magical force overtook Jon's body and, just as he expected to find himself transforming, the force gave up a sensation like a pop and sizzled, instantly doubling back on the rock and blasting Karyn instead.
"What the hellllllll," she said as her voice shrank away and her outfit pooled around her. She had taken on the body of her seven-year old self, but something was off. The long blonde hair she had wished for was still there, as were the sizable breasts. On the body of a little kid, though, they were genuinely disturbing-looking.
"What happened?" asked Jon, more than a little scared.
"I don't know! It made me your age, but couldn't undo my first wish. That makes sense. But why wouldn't it just make you older?"
"I wish I knew," said Jon, "But don't worry. It'll wear off in an hour."