I don't know if this one has been mentioned (too many names that sound too similar), but there's My NTR girlfriend.
You can choose from different branching paths and go back to the decisions to not lose time in order to watch all the content. It's primarily about NTR but it seems like by the current end of update it's opening up to NTS.
There's also My New Gf. It's not phone based and it's more about sharing and the spice of lowering the walls against taboos. Your GF starts being lewd with others, while you also get some cake on the side. It currently ends when it's getting pretty hot, but I'd say it's one of my favourite ones in the NTR genre. No sex outside of the couple atm.
NTR Phone is currently the phone based game I've liked most. Since there're so many different girls, each of them gives you a different interpretation of the broad of NTR, and also each of them has branching as well. So you can have a girl who cheats with your permission, one who does it secretly, one who does it as a revenge to you, one who does it openly whether you want it or not, one who cheats on you and then cheats on the other guy with you... man, it's so complete.
Overall, I'm liking this new trend of AI NTR games. I'm a huge corruption fan, and I always missed the NTR component from corruption because most people reject it like the plague. I hope it grows in popularity.