Warped Love

Great sex and sexy story.
Man I fucking hate whiny MCs.

(Also incest not inseki but then again the tag suggestion doesnt matter.)

Personally, I see this as vanilla. They definitely had feelings for each other and he was guilty AF about the pump and dump. And she took it out on him by being awkward about it in the manner in which she did it.

They clearly, from start to finish, beginning to end had mutual feelings for each other, however, they are both very awkward about it. And it finishes with a vanilla finish. Unless a part 2 is already available and not translated yet. Wish I knew if the author was on Pixiv fanbox or something, I'd know if they had other works going like others, then I'd know weeks to months in advance a release is translated.
Either way, this was a good one, regardless of the immorality of the topic at heart.

vanilla suggested

Good art. What the fuck is this scenario though???

I mean, I guess it works as a “why” boner. But still. So he raped her and she decided he was the only one for her and now they’re together? Okay? Like, pick a lane. Go full “forbidden romance and two conflicted lovers” or just don’t make it so weird in the first place and have it be vanilla from the jump. These “have it both ways” stories are always off for me.

That was more twisted than a (proverbial) Texas Tornado.

Once More, a "failure to communicate (clearly)" led to a lot of wasted time and energy. At least, by the end, Ryouchi and Sanae seem to have resolved their feelings about and towards each other, so they can now embark on a (relatively speaking) normal man-woman relationship .....

One can only hope.