So basically, if you go the Cuck path, it's pretty much okay, but if you don't it's not NTR but being treated like shit? What would you do differently if you'd write a branching path with Cuck and NTR, but done "right"? - in your opinion, ofc.
Ah i dont wanna do the whole thing about subgenres and what not but Cuck or in this case NTS IS a subgenre of NTR but usually they run independent of each other. A typical NTS route usually involves a party in the couple wanting to have the other partner (or themselves) explore a sexual dynamic of enjoying other partners. TYPICALLY this is all consensual.
It's antithetical to NTR which is more so cheating. Well no not more so its like exclusively. Its your partner being stolen from you. in this case consent is broken. Not just in cases of rape (which is a common theme admittedly in NTR Doujin) but in cases of breaking the trust of your partner and doing things behind their back.
There are cases where NTR and NTS DO overlap. The typical plot point is a partner cheated. The other partner realizes they liked it and asked them to do more.
Another uh "flavor" of NTR/s is the guy asks the girl to sleep around. He wants to be involved and then she later does it behind his back. Sometimes the plot point is that he wants to stop but she doesnt.
The interesting thing about NTR and NTS is there sometimes IS humiliation. For NTR maybe the guy walks in on the girl cheating and she doesn't stop and degrades him.
For NTS it's usually some SPH. Sometimes by request.
Wow i am yapping. I could probably write a thesis on this whole thing LMAO.