All good man, it's okay to ask for precisions before stepping in Life's Payback.
MC is basically treating almost everyone like shit at the moment, I doubt any of the LIs are considering an exclusive relationship with him.
Most of them have oral and sex scenes because they have to.
A few of them might be growing a little romance vibe, but that's not developed enough to bring the Cheating/NTR stuff on the table because some cat girl fucked one of them in a skippable (soon avoidable) scene.
The best thing would be to try the game and see if it fits your kinks, and if it does not, well, it happens.