If your fetish is extreme femdom from a bipolar schoolgirl, this game might appeal to you. Otherwise it's a hard pass. The writing for every single one of the characters is absolutely atrocious.
Mary (the aforementioned bipolar schoolgirl) is seemingly incapable of consistently maintaining any personality trait other than her desire to eat cum. She flip flops back and forth between being unbendingly domineering and punishing to you, to acting like you're in some sort of lovey dovey romantic relationship. This could potentially be interesting as a plot point, but as far as I can tell it's not even really noted, as if the other characters are completely unfazed by her 180 mood swings.
Your sister is for some reason near instantly trained to be a perfect slave, to the point of literally ratting you out for wanting to escape what would seem to be (I say seems to be, because it's not like the game really tells you how much time has passed, you just go to sleep and assume a day has passed) only a few days into your imprisonment. This is almost 100% handwaved by having everything supposedly done to her happen off screen and being told "Mary spent a lot more time with her than she did you."
The MC in a lot of ways is the worst offender simply because he is the MC and obviously serves as the player avatar and PoV. He is an absolute retard that will one second internally monologue to himself (and he has these internal monologues incredibly often) about how he "needs to pretend to be obedient" and five seconds later will keep doing dumb minor shit to land him in shit with one of his captors with *no* benefit at all. Speaking of "obedience", part of the description talks about being able to decide whether to willingly submit or resist...as far as I can tell, this changes literally nothing. I'm not saying this in the sense of "The MC can't break free and dom all the women.", I'm saying from my cursory tests, whether you chose to resist in every option or submit in every option makes absolutely no difference to anything whatsoever. Characters react functionally exactly the same, the exact same scenes happen, etc. If you disobey every chance you get, eventually you hit a point where you get put in chastity because "Mary's methods aren't working". But if you instead submit every chance you get...you still get put in chastity because "Mary's methods aren't working". It's just a completely kinetic novel trying to pretend like it isn't by throwing meaningless variables into the mix.