wow, i think her breast will hurt quite a lot in such bondage. Not that anyone will ever care, both the person who did that to her and the audience, hence that's why she s always getting raped in doujinshi/h-game and no one ever cares about her personality, and instead just want her body and her to suffer and become a slut.
Yeah, morality in hentai is indeed often a hot topic. I for one enjoy good sexual images including rape, but I know I sometimes feel uncomfortable. Especially if said character/copyright has nothing to do with sex or treating someone as dolls for venting sexual desires upon.