It might be awfully early, but then again River learns people a lot faster than most, so she has a completely different meter on the subject than others tend to. Not to mention that her own moral compass is set to it's very own true North, so...making friends with a vampire? Not so strange, to her, if there are vampires about to make friends with.

Her handshake is a great deal more firm than his, but other than a slight lift to her lips she doesn't comment on it. "Do you sleep during the day or are you awake whenever the mind wakes you?"