Nah, as messed up as they both are, I fully believe they really do care/like each other. Yes, Sasha sleeps around but she doesn't view them as her "lovers", while our MC is so far gone he's okay with this. I always just frame the relationship similar to a netorase one.
This is genuinely one of the worst TLs I've seen in a while. It would've been better if you dropped white boxes with text on them on the actual page instead of awkwardly trying to put the text on the sides of the page. The effort is there, but lacking.
It actually makes perfect sense for our MC to have a harem. He is a King, and marriages are a tried and true method of forming alliances and securing them. Also harem hehehe :smug: