I hate to say it, but I think taking the story toward Karin being accepting to pretty much rape since the ugly bastard force himself on her is not a good way to go about this since Aoi pretty much broke her own principle here to use unrelated people for her revenge.
But idk maybe this guy also cheated or whatever justifiable reason the author gonna cook for the reason Aoi wanna use him so that there’s connection between him and Karin.
Btw this is just a minor criticism from me, I still think the form of revenge strategy in this story is league better than some revenge porn manhwa that also have shitton of fanservice.