So, just personal preference here, but seeing how incredibly polarizing this game seems to be I wanted to chime in. Games like Karryn's Prison do way better at integrating the sex into the gameplay, but this game for example is MILES better in one regard: the MC is actually somewhat believable. One thing that kills games like KP for me is the "INSTANT SLUTTIFICATION" trope; it's so wildly overdone in so many damn games, and for me it kills the immersion because it's just a thinly veiled excuse to have a pliable fuckdoll character who just submits to every weird fetish imaginable.
Imo the variety of sexual scenarios in this game is great (I'm also very partial to imprisonment and humiliation though, so that goes a long way), and I enjoy that there is a consistent portrayal of the MC being uncomfortable, embarrassed, and generally very well aware of how degrading everything that's happening to her is. It's that aspect of "stakes" that really does it for me, and while I have no clue how many people I speak for, I know at least some others get instantly turned off by the trope of the FMC being a totally submissive slut who makes the most pathetically fake efforts to "fight back" imaginable (e.g. dudes ask, not even threaten, to rape them and they go "N-no! I w-would never!....but here let me take my pants off anyway!").
Not trying to yuck anyone's yum, just saying that's how it hits for me, and I still respect that KP is, for many people, one of the GOAT hentai games.