Do you have an example for this? Can be other media as well, even non-porn.I think it will mostly stick with NTS and it would be wise. There is already plenty of NTR, and NTS where the MC is just yet another cuck and everyone predends he's not, out there. An actual NTS were GF respects MC and she only end up in rauchy situations without actively drool for any cock around except MC's would be refreshing.
I think, i have a general idea but haven't seen something like this.