Jon got dressed in his new room nervously. The stone was gone, he was in Zoe's room instead of his, and he looked a bit younger. He didn't know how it had happened, or how to figure things out. He grabbed his stuff and headed out the door, pausing at the pictures on the wall in the hallway. They were different.
In all of the family photos, dating back several years, Zoe was bigger and older than him. He reached into his bag and pulled out his school ID. It had his birthday on it. He and Zoe had switched ages down to the day. It listed his birthday as the one he remembered for her.
How had they swapped ages? And if they did, it meant Zoe probably had the stone, but how was he going to find it? For now, he needed to get to school. He could confront his sister privately at some point. How was he going to convince her of all this?
He stepped out of his front door. There was someone waiting there. "Ready to go?" they asked.