I honestly hate NTR, the stories from doujins really make me feel bad but in some CGs and games like this where the MC either just gets mentioned in one or two pannels or have the personality of a plank it feels more like a corruption or cheating story.
Same bro i hate NTR (Before) i always avoid them but since my resource of other Genres are getting low and i'm always waiting for update, i was like damn, maybe i should check this damn NTR for once in awhile, since it is getting so trendy...
and boom here i am, it got me hook and also after playing another NTR game called Henteria~ you Should check that out xD..
I'm already Expecting from every NTR story that MC is a dense MoFo and will never get the girl and i just look if NTRman is really decent guy that deserves the girl better than the cliche MC of NTR
oh as you mention Doujin, maybe you've check it out already, go and look for Dramus that new NTR Story of his got people all crazy xD