Dude... be 1000% honest here with me: if you're not a "fan" of incest, WHY DID YOU PLAY A GAME THAT HAS THIS AS ONE OF IT'S "MAIN" THEMES?????????
I'm not a fan either BUT I have no problem with it because it's all about consent and being between adults who answer for themselves. If you don't like it, don't play it. If you play it, don't complain about it like if no one told you "hey, this game has incest"