Sy bites down on his instinctive F-word-laden response and, in a vain attempt to save his sister from looking like a lush, takes one of the champagne glasses from Rosy. He has just enough sense to not take the one with liquid in it.

"Welcome back," Sy says, all fake-pleasant, before leaning in. "You know we can just leave now, right? They're not here, they can't get mad." It's clear that by "they," Sy doesn't mean their teachers.