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I agree, and there are some developers who are giving you choices at the beginning of the game to remove those aspects, or add them if you decide later.  I remember a game with an absolutely gorgeous woman who had a package bigger than the abnormally sized male MC.  I have seen the NTR option also selectable, though only a few developers think the MC might want to see his female interest involved with another person.  Female on female is a bit more accepted, but I have seen that removable as well.  Some developers allow you to choose the relationships, and in this way the incest angle is sometimes avoided when they make the male MC a roommate or stepson, but trying to make the universe smaller (i.e., confined to a smaller environment) the home with corruption and seduction makes things a bit easier, if not believable.  I download a lot of in progress stuff and I buy in during sales.  But if I could point you in the right direction, one of my all-time favorite VNs is "Being A DIK" available on Steam.  College Kings is also a good vanilla.  It has everything you seem to want.  For the ones I mentioned, there are no voices, but the scenes, writing, renders, and mini-games are enjoyable, and you can omit the mini-games if you like.   

I agree some tags cause problems when developers want as many people as possible to view their work, but don't put enough effort into the story to remove undesirable content, but on itch, you might perform a search with the harem tag when you select your browse desires.  Those games seem to have less of the stuff you don't like, but you could still run into some doosies, though the cover art should let you know if the harem is the MC's family.  On Itch, Maids and maidens, Prince of Suburbia, Ripples, and Eternum might be to your liking, but with very few choices, just good stories and decent animations.  Young Again actually isn't bad though, as the MC is disembodied, so if you can warp your thinking enough to wrap your head around his relationships on the border, you might not see them as perverse.  It is probably one of the better ways around direct incest I have ever seen imagined.  Kudos to Zargon_games for the originality.  As I run into some in the future, if you give me your info or shoot me a message, I will let you know.  I've check out quite a few good ones in the making, but they are incomplete, but the ones named are the top of my head goodies in your desired content.