Cuckoldry as a fetish is about getting off to being cheated on. It's not NTR to be cheated on in itself, and it's not NTR for your girl to have relationships with other dudes that are non-sexual. Or other women, for that matter. Hooking up your bro with one of the harem girls you're not sleeping with, or have slept with and have decided not to continue banging, isn't NTR. And no matter how much acht-chan wants it to be so, cunnilingus isn't NTR. Had that discussion once, guy was a nutter. It's also not NTR if you're fucking both people involved, which is why NTR is literally impossible in this game. The only NPC the MC isn't spanking with his ballsack is a man who not only has to walk sideways through doorways lest he clothesline himself, but also is a guy who doesn't have a goddamn penis. Who the fuck is sexually threatened by dickless Tavros Nitram?
Phew.
Anyway, in the interests of getting off the NTR topic, where's our impreg fetish, dev-kun? I wanna wanna want it!