This may be an unpopular comment but I dont ship the uke with the seme, purposely hurting the person you like makes you an asshole. He may be stupid and naive but he'll get tired of it eventually. I dont care how hot your sex scenes are, take care of your partner like you take care of yourself!
I can somewhat understand why she lost her enthusiasm, the mc wanted to be special however knowing she was just ordinary ( or is she?) made her gave up. Its disappointment that destroys people. Confidence must be protected.
Iruma should take lessons from Opera, hes like the perfect steward.