This one doesn't have ntr, right?
Depends on whom you ask. For some it is, if more than one dick is to be seen in a game. Those are the loadest complainers.
But strictly, it is cheating, often overlapped with humiliation as in cuckold.
ntr haters call mmf threesomes ntr. Or when any dick besides the mc's is seen.
(it is japanese abreviation translating to stolen love)