Not a fan of it, but don't really have an issue with it as long as it stays as fiction. It's problematic in real life because as others have mentioned, inbreeding can lead to birth defects.
I'm not against.
We talk about fiction, but if it were my case, everything would be in my feelings.
I do not remember the name of the game otome where you see incest, sister x brother.
Well, if they’re blood-related, I’m going to pretend that they’re not to make myself more comfortable. Fortunately, incest seems to be a non-issue in all ages otome games, though brocons (which I don’t mind) are quite prevalent.
I love stories about forbidden love. So I have soft spot for incest, student-teacher, master-servant or big age difference. But only in fiction - game, anime, book.