The tension ramps up a bit slow, which makes the nightmare scene in the beginning a smart choice as hook to keep players interested.
The plot though is pretty amazing, like I can see the story being adopted by a doujin artist lol. The length of the story seems pretty ambitious, but I think it's admirable that you're committed to branching paths.
It might be a bit late to change, but I think you'd attract more vanilla players if you kept the ntr and vanilla (i.e. have the ntr scenarios imagined by MC blurred) portions strictly separate for a true vanilla playthrough.
Can't wait to see more