Well this is the plot for nearly all erotic game but most of them gives you the option to act otherwise at least. But even then it can be made to work this harem thing without "breaking in" the girls and without them acting like sex slut bitches.
I also didn't like that Theo actually never told the MC what happened in school, that they lost their virginity to each other when he was drunk af in high school. And kept telling the MC that a jerk did it in school, but it was him. At least after their marriage (in the good Theo ending) she should have told him.
Well there was a lot of stuff that didn't make sense. I'm pointing these things out cuz i'm sad because this game would have been so much better with just a little different writing.