Karyn The Toy?

"Now, Jon," Karyn said, suddenly nervous, "don't do anything stupid."
"Stupid?" Jon repeated. "Like the stuff you and Mom did to me? I really didn't enjoy being toyed with, Karyn." As he said it, Jon's eyes lit up. "Toyed with," he said again. "What I fabulous idea."
Karyn didn't like the sound of this. "Jon, you wouldn't dare..."
"Why not?" he said, holding up the stone. "I wish for the next two days, Karyn would become a toy."
"Oh, hell," Karyn managed to say, before the wish took effect. Jon climbed the stairs and grinned at what he saw. Where Karyn had been standing, there was now...