Just a heads up 新妻特捜パトレイザー ~略奪天獄篇~ has some pretty good NTR if you are into the Fantasy/Sci Fi NTR, which I am. I know a lot of you can't get into it unless it's real life, but IMO there are only so many ways you can do NTR in real life so the fantasy stuff is sometimes a nice change of pace for me.
Anyway, technically it is Netori I guess, but not really. I'll do my best to explain it. So you enter your own name, which I always like, and you are the captain of this three girl team of super heros who fight monsters. The rub is that all three girls are married and love their husbands. The other factor, is your right hand girl, is your childhood friend whom you have feelings for youself.
After one of the missions, your character gets infected by one of the aliens and is possessed and begins to corrupt the married women. Like I said this is kind of Netori since you are stealing the girls from their husbands.
HOWEVER, the last girl you can corrupt is your childhood friend. This is where the NTR hits, because although it is technically you corrupting her, you are being posed, so it's not really you. So it's like your character has to look through his own eyes and watch an alien, which she is fully aware isn't you, have sex with the girl he loves. Kind of brutal. And then to drive the nail home she ha an orgy with a bunch of faceless dudes.
It's been a dry spell for NTR, if you don't mind a little cheese with your NTR, this one did the trick for me.