I wish people would stop treating the female characters as trophies, that should be claimed by this man or that.
If anything, from the beginning of this VN story, women have been depicted as having their own motives, wants, and aspirations.
Some may seem rather simplistic at first glance, others not so much.
Maki just wants to tease others, but does not hesitate to be bolder ; Ari loves being dominated and used by whoever wants to...
But even they have deeper feelings for the other characters they care for.
Maki shows, in the side dialogues, that she cares about her sibblings and their emotions.
Ari wants Vi to escape her father's controlling grasp, and genuinely pushes her towards Eric now that she knows he can satisfy her.
Vi is much more of a switch. She enjoys being in control, especially in regards to Ari, but she loves being dominated by Eric, and simply loves him.
Anya searches herself, has recently discovered a very strong voyeur fetish, sprinkled with lesbian curiosity, and is in a constant emotional chaos.
Yes, it is a porn story, and the creator might be a fan of the classic BBC trope, and of the sharing of lovers (willingly or not)
But it does not mean he does not want to spin his own version of these fetishes, or turn them on their head.
I do believe that he has quite a few ideas in store to innovate and create something different.