The MC is an NTR machine, he will just keep NTRing a bunch of people left and right nonstop, including his own party. Get ready for a grand magical adventure full of cuckolding, an almost magical adventure, one could even call the MC a Cuckolding Wizard even.
Ok jokes aside. From what I recall, you will have random bits of cuckolding here and there because that's what the MC does. Most of what I recall is plot relevant, well as much plot relevancy as plot relevant can be about an adventuring team where one party member keeps going on sidequests to cuckold anyone and everyone he sees. If anything, since we're going to be seeing things from the MC's POV most of the time. The NTR isn't the sidequest, it's the main quest.