Amor Magic Academy:
I am replaying this game and I think it's a perfect spring board on several things that are not attractive to me in an NTR game. If you haven't played it yet, give it a try. They allow you to rename all characters in the game, and I did this for the MC using my real name to see if I can get a different reaction.
Cons: No control, Insta-slut, Broken Toy
The game starts you off with your girlfriend. You're supposedly in love, but due to some silly circumstance, she has to fuck the teacher like 500+ times in two week to get a power-up to fight monsters and shit. While the plot is...not too terrible (since this is the world that was built, and didn't break any rules), the fact that you can't do anything while your girlfriend gets cummed inside like 100 times is kinda dumb. This whole portion is a prologue. Your girl goes from a normal girl to a massive slut in a single sitting with 4-5 scenes. Zero control from the MC. You can't stop it. It happens. It's not interesting because you barely "know" this girl. You don't really give a shit because she's now fallen so low that it's whatever.
Pros: Tons of combination of NTR partners, scenarios, and content
At this point, the game REALLY starts because there are 3 girls. A sister, your GF, and some random chick. There are a TON more scenes and combinations. For example, there's 4 guys other than you. If you go around the school, you can watch them get fucked based on your relationship status. You can turn her into a "cum slut", or a "lover" again.
Cons: You can't really love something so fucked up
Maybe some of you hardcore people CAN actually get behind the idea of turning Rimi back into "Lover" status, but I personally can't. If you check her stats when the game "starts", meaning she broke up with you and now you can win her back debase her, or fuck with the other 2 girls, she had over 500 cum shots inside her. And a 100% compatibility with your teacher. From a writing standpoint, I know next to nothing about her. What her interests are, what her beliefs are, what her favorite color is, her favorite food, etc. Point is, she's just a dirty, broken slut that was your ex.
Conclusion:
Content rich game with branching paths can be terrible. A NTR game must allow the player the CHOICE to break the girl, see her fall from grace, and watch her slowly transform. You can't rush it. You can't bring her to a F class woman and expect the player to be invested and interested in seeing her. A girl has to be A class, meaning she's pretty, smart, strong, and has a strong moral sense. She needs to be feisty. She needs to be charming and have class.
Games without choice are not worth playing. It completely breaks the medium. Even visual novel esque games have some choice that allows you to go on "branches". This game is a terrible product in general. If you want to enjoy this game somehow, I suggest you to "cheat" and skip that whole prolong prologue. And then use the cheat mode to make the girl your GF. I don't know if there's an option to erase her stats, but god damn do they need erasing. ONLY then, can you enjoy the rest of the CG, which there are a TON.