Why do they love NTR so much...
The way I see it, NTR is among a variety of narrative tactics that writer's use as a bit of an "emotional cheat code" to evoke a response out of readers. It's similar to how at any given moment the top videos on a porn site will be of the stepsibling variety. I would argue that like, 99% or more of people have not experienced an actual "NTR" I'm talking about the full on "I'm sorry I love you but they just are too good at sex" scenario.
You could get "I'm sorry I made a mistake", or "I'm sorry they seduced me", or "I'm sorry you just weren't enough"; that last scenario is what I feel like NTR has shifted to moreso over time to be "realistic" but when it comes down to it this is still just the author playing with your emotions, whether that's feelings of anger, insecurity, fear, or anything else. Something that people don't really recognize is sometimes we like to feel negative emotions, and can even get hooked on them.
What I'm kind of trying to get at is people often attribute NTR to there being something wrong with the Japanese populace, and to some degree that's true and to some degree that's false. This is less of a "there's something wrong with Japanese mangaka/authors" problem and more of a "there's something going on with consumers that makes them interested in this" problem. As mentioned with the stebsibling porn and to go further cuck porn, this is an issue in the West too. As the author of Redo of a Healer notoriously said, they did what they did because it was profitable, not because they personally liked it.
That said, this specific instance is not "NTR", this is just straight up a rape scene. Still a bit distasteful; I
was warned in prior comments, but I will say this...wasn't as bad as I was primed to expect? Didn't dwell on it for too long, didn't force us to read an extended rape scene, still not something I want to see and the way I would want to see it, but I can stomach this.