As far as erotic games go this is literally one of the best.  The sex scene animations are really well done...like verging on a masterpiece of erotic art.  However, what really does it is the writing.  I play a lot of these games and most seem clearly written by people that have no concept of how to write erotic dialogue or narration.  These scenes are all written just so well that it greatly enhances the visuals.  I would say this is easily the best erotically written game. 

The only issue I have...and I feel it's a big one...is the utter lack of choices in the game.  I want more control over the story and the ability to decide who I have relationships with and what sex acts/kinks I engage in.  I also feel the MC comes across as a sociopath/psychopath in  most of these scenarios which I find disturbing.  I would have much preferred a submissive path for the MC with dominant female sexual interactions.  I just feel it's a shame, because while their are like 1000's of these types of games the amount of quality ones probably at best number a bakers dozen and this is easily in the top 3.  I feel the linear nature of this story just holds it back from not just being a great sex game, but a great videogame over all.