Type-Moon shit in general. Where rape and abuse are treated as replacements for backstory and made into spectacle (Tsukihime, Fate).
Women's suffering is used as a disgusting scaffolding for chuninbyuu power fantasies (Tsukihime) or as a cynical author statement against idealism (Fate).
Rape until she likes it.
Pseudo-moralizing in the form of "see this taboo relationship? It's wrong, so they must all suffer for it. I'm so deep."
Forced tragedy in general.
Rape and abuse as backstory, or for cheap drama.
Seemingly loyal, sane and rational women becoming cock-crazed nympho...
Imadoki Battle Fantasy ~Yuusha to Maou no Dousei Seikatsu~: You must be registered for see element.
Prevent new war between humans and demons... by giving the Hero's descendant a school harem?
Madoshi Shiroki: You must be registered for see element.
Magic, cute kemomimi girls, imouto love...
It's great, but to unlock all the scenes you'll have to play more than once. There's also some RNG involved (invest in happiness level to incrase the odds of positive events that reduce HP costs).
There is just something about brothers and sisters with a special, unbreakable bond that speaks to me. I have a few theories about that.
Someone who has known you their entire life, shared living space with you, knows all your flaws but still chooses you unconditionally, even being willing to...
The image generation method is showing its age. They all look like they let out a massive fart and are trying not to laugh. Still, looks worth monitoring.
Probably quite long, since I would treat each of them with care and respect rather than acting like those fuckboy protagonists. Unless that made them even hornier and more forward?
If you want to make smut, just make smut. Don't try to justify it with an overly elaborate, pretentious and badly written plot, dressing it in pseudo-philosophy and "deep themes" nonsense.