"I'm glad I have a sister like you. I can't even imagine what it would be like if we didn't get along so well," Jon said.
Both Zoe and Jon blinked at that.
"Something feels ... wrong, about what you said," Zoe said.
"You're right. It feels like we should be ... fighting with each other? But I couldn't even think of fighting with you."
"And I could never fight with you either," Zoe said. "But, it feels like we're supposed to. Why does it feel like that?"
They were both thoroughly confused.