You HAVE to be stupid for the Ntr to happen any mc with two brain cells and a minimum amount of pride would do something about it or just move one, thats why ntr is bad to tell a story ONLY about ntr, you cannot make what should only be a plot point into a full story and expect any good story at thats point just make a short story like many doujin have already done or change the perspective to the bull thats way you could actually have something interesting