Sadly, I have to change my opinion of the game. Though well made, there are things that happen in season 2 that no amount of times that I did a grind in season 1 ever triggered to lead to what the story is saying in season 2. And the character taking on calling the girls sluts etc. during sex was not how he talked to them in season 1. It is like you changed a writer or shifted how you wanted to write the story. Sadly, this is the last "disconnect" with the game for me and I am going to delete it. I hope your game does well with other people. Just happened to fizzle out for me in the end.
If I say it with as few spoilers as possible—so other people won’t understand which girl this is about—I’ll put it like this:
In Season 1, if you played through her events, you could see that she was the one who asked the MC for it herself, because she enjoyed it. So what you called “just for one girl” doesn’t happen with everyone—it’s simply her personal fetish, since she likes being dominated.