Jon was still in the bathroom, but he was not himself. He had turned into a blow-up doll version of himself, which layed on the floor.
Normally, a blow-up doll couldn't have a mind, but this was magic, so it did. Jon couldn't see anything, but he could hear and feel, for some reason. He heard the bathroom door open and felt something pick him up.
"There it is," he heard his sister Zoe say. "I wonder how it got in here?"
Zoe uses blow-up dolls? Jon thought.
"What's this? A stone? Where did this come from?" There was pause. And then Jon heard her say "Oh, it's probably something Mikey got from outside."
Then Jon heard a crash. From the sound, he figured that his sister threw the wishing stone into the garbage. No! That's the only way I can ... Then he stopped when he realized something. And it filled him with horror.
He forgot to set a limit for his wish. He'd be stuck as a blow-up doll for the rest of his life!