However, Cait's reaction to the whole thing afterward should give you a pretty good clue as to the moral valence of the "favor", if not its nature. Imagine the sort of thing that would make your happy, loving, extremely sex-positive kitty priestess feel like she does afterwards: "flustered, cheeks reddened, not the usually lustful rose-hue that you've seen before".
Then imagine what that says about Oxana, who demanded it of her.