His eyebrows shoot up at first, and he does flush a bit at the kiss on his knuckles, and then they lower into a furrow. Hand could mean a number of things, and he's not really equipped right now to figure out what possible context or interpretation the implication is.

There are no more words from him, just silence as he observes Astarion while bowing in return. As Astarion leaves, all he can really do is contemplate how that went and the surprising twist their dance took at the end.

Much to think about.