The surprise is on her face when he moves in for a hug: it's not necessarily shocking that he'd hug someone, he's always been like this despite Dad's best efforts. But that he'd hug her is - well, that's unexpected. What is probably predictable to anyone but a pair of teens is the way Vanya's whole face lights up when he passes that small praise. She's never been the best at anything, in this house, and even if it's this small, questionable thing that makes her feel good and terrible at the same time - it's probably selfish, but she'll take it.

So Vanya hugs him tight, face pressed against his shoulder. She doesn't let it last long, though, and eventually pulls back. "You should probably get to bed."