Jon whispered his wish to the stone. "I wish that when I tell Zoe about the magic stone and the wishes, she'll believe me, but won't try to get revenge on me for it."
Then he went back to Zoe's room and knocked. When Zoe answered, he said "Zoe, I need to make a confession. I made a very big mistake. I inherited Grandpa's magic stone, and swapped the personalities of Mom and a real bitch at school."
"You what?" said Zoe. "I didn't even know Grandpa had a magic stone, though I was always a little suspicious about him... God, you really did screw up. So who's the bitch, Jon?"
"Never mind that," said Jon. "I didn't mean for it to turn out this way. I've given you years of memories of being mistreated by Mom and that just isn't right. The wish is over in a week, which means I need to do something until then."
"What are you going to do?"
"Well, I'm going to make a wish...."