Hey battali0n.
So, I don't intend to put polyamory in the VN, the girls only love the MC, they participated in sex together and I intend to let you choose if you want them to do something together when the MC is present and that's it. As far as fetishes are concerned, I'm not going to include many, but what will definitely be there is pregnancy, anal, voyeur and group sex (FFM, FFFM...). Never NTR. If I add another fetish, I'll probably ask you all for your opinion.
I hope I've answered your questions, big hug!