[The fort looks great, and no one can convince Billy otherwise. He takes a moment to look it over, and then, satisfied, he climbs inside and flops down on one of the pillows within, gesturing for her to follow if she wants.]

Not really? I mean, it's kind of dumb to bicker about that when neither of us know, but in a way, I'm grateful. If that was his way of getting comfortable with the idea of us being brothers, then I'll take it.