This is a brief opinion/review after about an hour to two of slow game play, reading the entire story so far. However, I'm only at the end of Chapter 2.
The background of the story a great setting. The character development from what went through so far is also excellent and each of the ladies tend to have a distinct personality, which makes them stand out on their own. You get a very clear sense of who they are through the telling of the story, which is how good development is done. That's the good.
The not so good: The protagonist just flat out pisses me off. He's really nothing more than a McGuffin to move from one BDSM NTR scenario to the next. He has no depth, agency, or self-respect. I guess that's the 'fantasy' playing out in the story, but it takes an otherwise great setup and turns it into a railroaded male slut/slave/simp trash read.
Opinions are like A-holes, we all got them and they all stink, but that's my two cents.