This is probably mentioned before in this thread, but I'd like to write about what I find attractive about NTR themed games. For me, it's not really about the NTR aspect.
I like the idea of having something of supreme quality, something beautiful, strong, good (morally) and see it become degraded, corrupted, if you will. My favorite example is Tracer from Overwatch. You have someone who is optimistic, a do-gooder, a hero, and of course, stunningly beautiful. I'd like to see them progressively go away from that supreme beauty. To deviate from their values as a person, from what they hold dear, and watch them change little by little until they no longer resemble anything that made them beautiful (on the inside of course, I stay away from games that physically disfigures my heroines).
Interestingly for me, just like with toys, broken ones are no longer beautiful and are no longer fun. Just like a story that you know the twists to, once a heroine is corrupted I no longer find her beautiful, and the game becomes less interesting.
NTR games have that element of corruption into it, and when I judge a game, I judge it based on a few things.
1. Plausibility - In terms of scenario building, in terms of writing, and in terms of the series of events that lead to that deviation that I mentioned above. If a game makes no fucking sense, why even bother playing it? Just go to Rule 34 and jerk off there. I want to be shown a story of something wonderful turning into a nightmare.
2. Art - Art has to be of decent quality and consistency. I hate when artists draw girls with massive tits that are just fucking disgusting and unrealistic. Any art that resembles normal looking proportions that you'd find on a magazine is good.
3. Choices and POV - If the game gives you that ability, to influence the actual events of the corruption, it's even better. Linear games are OK, but it's less content and less interesting to play as you're not as invested.
4. Audio - don't really care, but voice acting that are done well makes a game better.
Do you guys have any suggestions that have these qualities?
Here's a list that I find good:
1. Soredemo Tsuma o Aishiteru 1
https://vndb.org/v6593
2. Soredemo Tsuma o Aishiteru 2
https://vndb.org/v21346
3. Kenka ga Tsuyokute Cool de Tsuyoki...
https://vndb.org/v19493
4. Oyako Rankan
https://vndb.org/v10732
5. Tsuma no Biniku o Ijiru Chichi no Futoi...
https://vndb.org/v16915