To answer the harem question.
In the classic sense, no you won't have a harem of 5 women in your house who all enjoy you at the same time. Maybe 2, maybe even 3.
But not all of them or even the majority of them. I can safely say that there will be FFM, though.
Generally, you will be able to advance with most of them in one playthrough. However, for some girls, to get certain endings for them and some special scenes with them, you will have to opt out of the others. But that is closer to the end of the game. All of them will have their own unique kinks and fetishes, And to fully enjoy SOME of them, you'll have to make a decision. That is my current vision regarding this question.