I'm one of those weirdos that considers female on female cheating, as much as female on male. I get that it's a harem, im not concerned with that, and i don't want you to change anything, i simply want to know if you can by pass those maria events, or if they are required.
Is it so bad that i have different fantasies?
I'm also wondering if relationships with all the girls are required as well. Not everyone is going to like every girl.
Having different fantasies? No that's not bad. Considering it cheating and therefore wrong, for Maria to have sex with Lin, but ok for you to have sex with both Maria and Lin, yes, that's wrong. I'm not saying it isn't how you feel. I'm simply saying that all things being equal, you're saying that it's ok for you to cheat, but not for them, and that is simply hypocrisy. That said, there are plenty of games that aren't explicit harems that cater to this.
Runey doesn't like to gate any content behind any other girl's progression, but there's no guarantee that Maria will be the only one playing with the rest of the Harem in the future. That's thematic to the premise of the game.
Similarly,
In short, this isn't a game where you are sneaking around behind a bunch of separate girlfriends' backs. It's a game where you're openly courting a harem who live together and know they're all involved. Is it ok for you to like different things? Yes. Is it ok for you to attempt to muscle your views onto the project? Not really. As I just told people on my game's thread. Not every game is made for you. We all have different experiences, desires, and kinks. Just as you don't have to read every book, you don't have to play every game. But maybe, in the case of this, you might have some personal issue to overcome instead, because this isn't cheating, this is your harem interacting.