I know I keep suggesting this game; I really believe this is the most slept on Orcsoft game:
Big Black Cock & Big Black Butt & My Sweet Wife
(I'm well-aware how stupidly embarrassing that title sounds and I'm all for it)
The plot is genuinely interesting delve into NTR where the couples are consensual about it, at first. The characters are pretty mature and even nice people. Everyone is and acts like an adult, a rare setting I find in hentai, in my opinion. You get to see these characters become more lustful as you pick what your main character does to each of them. There is no “true” ending and the closest to a good ending involves you choosing to NOT mind break your mistress. Said “good” ending has a very sweet romance blooming, in NTR of all things.
This is one of the few Orcsoft games with MANY paths and endings. And on the main menu, you can look at a branch diagram to see which choices lead to which endings. It even lets you rewatch various sections of the story. It is not just the ones with choices or h-scenes, but also the scenes without those two things. Meaning you can rewatch/replay mostly the whole story just by clicking on each section on the branch diagram.
The art was made by the same Hamashima Shigeo (of Oral Lesson with Chii-Chan, Euphoria, EROGE! and even Maggot Baits fame)
And her art here really shows an interesting transition period of her art style.
Thanks for bearing with my long ass post