this is some feminist bullshit, painting sayu as this poor innocent girl tossed between men using her for their base desires. no, she was a whore, that's all. doesn't mean she's not a person, but she is what she is, and this story lies if it wants us to think she's something different. the guy is just treating her according to what she is - which is called honesty, and justice. but if you took this manga's POV seriously, you'd have to believe that any time a woman feels uncomfortable, then whatever man is involved is raping and victimizing her. bullshit, as we saw from the very first chapter she actively seduces men! if she's unhappy with the consequences then she only has herself to blame. this guy is just a guy, maybe not a very virtuous one, but not a villain.