tl;dr- if you like lessons in love, this is a condensed version of that with better visuals.
I felt like there should be at least one review that actually talks about how this is as a "horror game" beyond the bait and switch. I do think it deserves a lower score when that is considered, but as a horror porn game, I'd say its a 3 star.
The thing about that, is that if you're going to swerve your audience like this, especially to moralize at them, then you need to be sure that you have a strong and thought-provoking moral.
This game pivots halfway to tell you that raping your underage relatives is bad, and that its weird how its legally ok to jerk off to an 18 year old and not a 17 year old. These are not revelatory ideas, most of your audience understands these basic concepts of morality/legality and it comes off as overly preachy. It would be like if you bought GTAV and after an hour it became a terrifying, gory, jump-scared psychological first person horrror game that kept shouting "STEALING CARS IS ILLEGAL" at you. It's not enough to justify the betrayal of expectations.
That said, the presentation and effort and atmosphere here is 10/10. The visuals are truly disturbing and well-crafted. Especially when compared to Lessons in Love, which coasts on shitty UI, recycled KK animations, and just puts a bunch of scribbles and smiley faces on screen to be "scary" and has just as equally inane of a moral (dont rape your students), but is very succesful because it was clear what it was, and its' audience knew what it was getting into.
If the dev's next project is more up-front about its horror content, and goes for a more subtle underlying theme, I think they'd really knock it out of the park. There's a lot of talent here. If you like horror games, it's worth a quick playthrough.