After Jon had showed his sister the stone and explained its powers and limitations, Jon asked her, "so, do you want to wish some things with me?"
Zoe sat back for a few moments and then smiled and said, "Sorry, I just needed to digest all of that for a moment. This is really cool! I am honored you chose to share this with me. So, to answer your question, yes I definitely want to try this thing out!"
"Cool," Jon replied. "What do you want to wish for?"
