So after playing the first bit, the story seems like the most basic version of this plot possible The viewpoint changes a lot. You are the MC, then you're his wife who masturbates to him looking at student porn, imagining the students stealing him from you, then you're the dude, who has his wife say, hey I want to try cuckqueaning, to which he's like yeah sure uh I guess if you can find somebody. Cut to every student having a scene where they go "Man, I sure love that MC, too bad he's married." Only for the wife to post in the school forum, "Hey guys, want to bang my husband?" And thus the cuckvengers assemble.
Unless there's a wild turn, ntr is purely good ntr. And not even ntr because she wants it. This is a harem game in which your actual wife wants you to bang schoolgirls and call her a cuck. No more and no less. Unless the ending pulls a fast one on me, but I've been playing for 10ish minutes. Unless you think her thinking "I'm an old whore who nobody would want to fuck" a total bonerkiller, you're fine.
Edit: Ok the only thing that might get annoying is that she just keeps bringing it up. Next, she is like hey let's roleplay, you be you and I'll be the student that you should be fucking instead of my old wrinkled ass. Also there's life interstitials so hope you can hold your boner as he is a loving father.