We get it. You like lesbians. Emily was obsessed and deeply in love with the mc. When she finally got him, all of a sudden she wants to be with women. Makes 0 sense. This a harem game. Was always advertised as much, not a poly game. Oni all of a sudden wants to be with women also out of nowhere. I don't have to fuck a dude to know I'm not into dudes. These characters were well established with 0 interest in other women, then bam, all of sudden they wanna fuck each other.
Harem is a power fantasy where all the women love the mc and only the mc. Poly is where they all love each other and everyone fucks everyone. This game was always a harem. None of the girls showed any interest in other girls. If he wanted to add lesbians as side characters that can be completely ignored, fine by me but, when you change well established characters to all of a sudden become bi, especially Emily that was so in love with the MC and finally got to have sex with him to turn around and wanna fuck someone behind his back shortly after finally getting him makes 0 sense. That's the issue.
This whole "the mc is cheating on everyone"....It's a fucking harem game, not a poly game. Harem players don't wanna see their girls fucking anyone else, especially behind their backs with characters that make no sense. Poly players love sharing their girls which, you fall under. I would never trust you to give him any type of ideas. You already said you'd have them all fucking each other in the house behind mc's back so you can maybe walk in and have a 3 some. You literally prefer lesbians over straight relationships. I think you should play games that have a FMC and is strictly lesbian because that's all I see when I read what you write. You don't understand the difference between a harem and a poly.