Wait... So if you possess the husband and fuck the wife while you're in his body, it's still NTR?
Which one is it? Of the 49384 NTR definitions? Because there's no "cause jealousy" between two lovers who fuck each other, if none of them know what's going on. Wife thinks she's getting railed by her man and the guy either don't know at all or he's along for the ride, thinking his body is moving by itself in some kind of induced trance or something.
If you take viagra and fuck your bitch for 3 hours straight, is that NTR?