Ugh, I typed out a really long post, and it got eaten by the automatic backup gremlins. Dammit.
Okay, I have two recommendations for NTR games with fairly good writing. Opinions may vary, of course, but I enjoyed both of these.
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is a fully translated H-RPG that blends netorare and netorase. Basically, the law of the village is that if a woman isn't pregnant within a certain time frame after the marriage, the couple are forced to divorce and someone else marries the woman. The village chief decides to give the hero and his wife the "favor" of letting other men knock up the woman instead so their marriage can continue. The man is fully aware of what is going on, but
at first truly hates it. The wife is deeply uncomfortable with the situation
at first but wants to remain married to the husband. Notably, the relationship between the two is (in my opinion) fairly well written, at least by the standards of porn games. Also notable, some of the bulls the woman gets lent out to actually feel bad for the husband and do their best to make the whole thing as easy on him as possible.
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is a partially translated H-RPG that spends a significant amount of time building up the relationship between the hero and the girl, and making you the player fall in love with the girl. It's got a long build up, but that makes the eventual degradation feel all the more personal. The game admittedly runs on tracks for the most part, but the art and writing are both good and the characters feel as real as porn game characters can. I will admit that I was working on translating the game before I got too busy and left it on hiatus, so I'm biased, and I will admit that opinions are mixed.