What is the endgame here besides just heavily censored basic hentai plot?
At this point? The only way I can read it, is that everyone will turn into a slut. Considering the retcon, that explicitly removes progress toward the "relationship" route, and everything that happened after.
Now the author takes the only "pure" character in the cast and puts her in the crosshairs of a fuckboy who will definitely lie through his teeth just to push her into sleeping with him. Including saying that MC is fucking with the pres every day.
This author is definitely not interested in what most people would consider a happy ending. It will be some kind of depraved fuckfest, where everyone says they are happy, while their eyes are completely dead.