Sure sure man,whatever floats your boat..Still the point stands people don't go complain in vanilla games about and beg to be NTR in there,where as people in NTR game always come and say shit like is NTR avoidable,where as most vanilla or other genre games are free of these kind of comments,It's mostly the NTR games where vanilla fags come to cry and manipulate shit due to the dev being amateur.
And I know all kinds of NT genre,I've played so many NTR,NTS japanese games you've never really heard of,of coure games from devs get manipulated in some cases like NTS having NTR like you said,but the game had the potential to have NTR to begin with,and the fault lies with the devs who cave in to every people comment,I've seen a very good NTR game get abandoned due to vanilla fans crying about no ntr route,to the point game dialogue got so much manipulated and complex and the game got abandoned because the dev tried to keep vanilla fans happy while the game clearly had NTR genre,so your point of inserting NTR into NTS can be used in many genres,which wasn't my point at all.
It's been many years I've been playing these games,so no need to clarifiy to me...every NT has the premise of having another partner rather than the main lead,so NTS not being a subgenre is not really incorrect,It is a matter of POV and people who deny that are just entitled to their own biased opinion..You can't really say NETORARE isn't a subgenre of cheating genre because It basically is,just like how hotwife/cuckold can be considered part of NTR games.