You don't need to see any of the NTR stuff at all; it's entirely optional and easily turned off.
"Find the Third" is part of the main plot - it's a question that hasn't yet been answered.
Bbben thank you i hate ntr with a firey passion you a god for making it optional
No problem. ;)
It's more like an alternate timeline thing; I consider the main path to be non-NTR, in as much as there's any definitive way to play it.