What does Max is in control of in this game btw?
First, he got no job/money/influence.
Second, he is neutrulized by Eric.
So he becomes a little piece of shit and trick his sisters to be punished for gaining some influence over them. So mom is in control (unconsciously)
Third, everyway to get the upperhand over Eric passed by Kira, so in fact she is trully in control.
Forth, if Kira is no use, it's kate who dictate the game...sex with Alice, the mother's possible route for Eric...
I can find many more things but you see my point, by himself what does he done? Peeping, tricking to abuse and not even became the real boyfriend of Liza coz once again it's Kira who run the show...
So it was fine to hate Eric but damn it it is hard, at least for me, to apreciate the MC. I might forget few things but in general Max is kind of little piece of shit; funny to play but damn hard to feel concerned by.