No, he might be panicking prematurely here. Carissa opened by saying that she'd be curious about what happened to him, but afterwards mentioned that Keltham might be tired and need to find a bedroom to sleep in, rather than by suggesting that they immediately go to a cuddleroom. Romantic norms here probably call for some subtlety. Probably.
...how about if he smiles in a friendly way, looks appreciative of appearances, and pretends not to notice any overtures that aren't fully overt? He's from a very alien place, and it should be much more plausible than usual that he actually isn't picking up on flirting attempts.