After eating, Jon took a paper cup and poured in some milk and cornflakes. Then he went to the bathroom and locked the door behind him. Sitting down and removing his pants, he stuck his penis into the paper cup and let Karyn eat. It felt extremely strange.
Then something occurred to him. "Karyn, I just realized. It isn't permanent."
"What?" said the voice from between his legs."
"It isn't permanent. Look, Zoe said she saw you come into my room. But we know that the stone makes people think that the way things are is the way they always were. So Zoe shouldn't have even remembered you exist unless the new reality was that you just became my penis for some reason. All we need to do is find out what that reason is and we have our way to fix it."
"Mmmmppph."
"What?"
"I said, why didn't you figure this out before, instead of leaving me in this embarassing position?"
"You didn't figure it out. You know, I'm wondering, what if it's Zoe? Magic is real, and she's into the occult."
"Hm," said Jon. "Maybe Zoe did do it in the new reality. But even if she did, that really just means she remembers doing it, she didn't really do it."
Zoe's voice yelled out "Hey, Jon, are you finished in there?"
Jon said "Just one moment" and pulled up his pants, then crumpled the cup, put it in his pocket, and gratuitously flushed the toilet. He left and Zoe went in.
Jon realized that since Zoe would be in the bathroom for a little while, it would be the perfect time to check her room for evidence that she's been doing real spells....