As mentioned I'm not interested in using incest of any kind for a game.
Still, I have to say that this here is complete hypocrisy.
Game of thrones is nothing but pornography that doesn't actually show sexual organs and chooses instead to glorify all forms of cruelty and perversion, including incest and rape, which is at one point defined as a formative experience.
Regardless of how good the show is, I really do not believe anybody supporting it should have a right to judge the work of Hgames devs. Basically the Patreon TOS, I now have to assume, only means that indie devs have to be careful but big productions can do whatever they want. Money talks.
You miss the point of Game of Thrones entirely. Its about how horrible war and rape are. Its about how much damage incest does to a society (especially Jaime and Cersei's murderous attempts to cover it up). Ned dies because he learns about the incest. Bran is almost killed because he sees the incest. Robb starts a war because his dad dies and his brother is almost killed. Incest in GOT world is definitely looked down on by almost all of the characters in the book - but somehow you come away its basically porn because the two characters doing it are hot? A dwarf fucks a lot of people? One bisexual Dornish Prince?
GoT aside. The incest fetish has little to do with impregnation (though some get off on incest even more due to inbreeding), but due to its perversion, its general 'wrongness', and to a large degree - the closeness that some family members form. Some of that closeness is in the form of friendship, some of it is in the form of antagonism. A brother and sister that resist sexual urges and get along for many years and then suddenly one night something snaps and they give in. A mother and son who are constantly at each other's throats for years, when suddenly one of them becomes vulnerable and in a momentary lapse of character, sexual frustration is released. Its an exciting fetish because society tells us this was the wrong decision. The siblings could have just talked through things, found other people to experience sexual release with. The son and mother could have worked out their differences or found other partners to satisfy their sexual urges. A father and daughter that repair a shitty relationship with the one tool they know has repaired other shitty relationships - sex.
A sister sister relationship would be no different than those above - even without the risk of impregnation. Perhaps the scenario is they love each other like other siblings do - but confuse their own sexual frustrations - not having girlfriends or boyfriends - perhaps due to lack of experience, or fear of rejection - and take a different path - sexual release with someone they know, and trust absolutely. Their sister.
Please note - I do agree that society's views on incest is a bit hypocritcal, and in fact its society making incest Taboo that gives it a draw to a lot of people. Additionally, some societal, and religious views on sex skew some people towards the incest fetish. In the HBO series Big Love, the eldest son of the main character falls for one of his father's wives. Its a totally believable scenario - an attractive woman who doesn't get the full attention of her husband (who has 2 other wives), a confused young man who is told its wrong to have sex outside of marriage, but has had sexual urges for years. Both have to keep their sexual desires outside of marriage secret - who better to trust or share than family? Well aside from resisting, of course. But again, a lapse in judgement. Giving in to that basic instinct.
Or as you say, two girls who are decent, intelligent, respectable members of society, who want to experience sex, but fear being branded a slut because they don't know if their first, second, or third boyfriends might be that right match for them - so they experiment in secret, with someone they trust, someone who will equally suffer if word gets out.
And of course, yeah. There are some perverts that just have to fuck everything - family included, but they are the most base and crude form of incest, a character that has been done to death with all these games here, and I could see that you might be sick of incest if this is the only incestuous characters you come across.
