All the bishies until now have been treating our heroine mostly as either as a cute little relative's daughter they're taking care of, a saint healer they worship and protect, or a good friend. With the exception of that one rapist summoner king...and this other random hookup of a demon king.
Somehow that context makes this fated lover plot turn feels so violating. Like, can we not? I liked it better when she was, you know, the Black Healer.