Too be honest at one point a lot of stuff comes above water and girls will get mad at us thats just one thing I definatly see happening.
Caus there is no way we can hide fucking other girls in such a setting and they all believe they the only one we fuck.
So probally something dramatic will happen nothing as bad as a death but definatly something that will make u feel like ur a bad person for doing that to those girls.
While this can happen, i hope we can defend ourselves. Because we're not in a relationship of any kind. Really, we don't owe anything to no one yet.
The game need a moment to present you the choice to start a relationship to one of the LIs before the ending, so it can presents some challenges and temptation. This is something those games usually lack. Basically you start the relationship in the ending.
But imagine that in the last two chapters you're already set with one of the girls, and it's just getting to end of the story, being faithful (or not).
Aside from that, let's take a look at where we stand with each main girl:
Maya: A friend with a lot of chemistry and that if it keeps going can develop into romantic feelings.
Josy: A crush basically, that you have a lot of sexual tension and it can blow up anytime now that you're in the same place again. She is like the cool ex you don't hate and can get back to.
Sage: Fuck buddy that is really friendly and just... Cool. That's the thing about Sage she is just cool with you.
Jill: Nice girl who cares about you and an actual just romantic interest. She and the MC didn't have the time to develop an actual friendship like Maya and Josy, she is the kind of girl you can go straight to a relationship.
Bella: She is the girl that you're starting a friendship but you chemistry is explosive. She is basically the one that if she was single, would be at least a "friend with benefits" type situation, that can develop into a relationship.
The thing is, the only girl on the list who is single is Jill, the other ones are in a complicated state (Maya and Josy), in the last stages of an ending relationship (Sage) or married (Bella), they're the last people in the world who can demand the MC to be faithful to them at this stage of the game.