He's pretty happy about that!
nsfw
Happy enough, even, to let Yaisa -...apparently he's not that happy? Yet?
It just feels - weirdly wrong and awful that Yaisa might think she was owed an orgasm, that she'd deserved or earned one, if they start off their relationship this way? That Yaisa might start expecting orgasms on future celebratory occasions or anniversaries, and feeling wronged if she doesn't get one?
Keltham probably wants to see this girl come again at some point, but is weirdly afraid of doing that tonight.
Keltham briefly considers whether to force his brain into doing this anyways, but backs off. He doesn't think you're supposed to refrain from doing things you might have enjoyed, out of fear of where it might take one's relationship; but he is uncertain of himself still, and there is also a heuristic against forcing yourself to do things you feel afraid of doing. He can always make Yaisa come next time, when it'll definitely actually be just because he feels like it, and not because he owes it to her or that's an informal rule of their relationship.
He should tell Carissa about that part. She'll probably be happy? At least Keltham is guessing so, anyways. Carissa is always happy when...
..well, it feels, sometimes, like Carissa is always happy when Keltham is cruel to somebody. But it's presumably more that she's happy that Keltham is being Evil and learning to do what he himself wants, that Keltham is discovering his own sexuality, and that Keltham is being more the way that Carissa hopes he'll be towards her.