I find the wife pitiful but Ikurou was also pretty pitiful. If she wanted to have sex with him, she could have initiated it and he wouldn't say no because he was very weak-willed. The fact is that she didn't love him either and didn't attempt to get close to him or know him more. She even set out two bedrolls instead of one so that they could sleep separately.
If these two made babies, it would be miserable for them both and unfair to the child. He was beyond damaged. He grew up without love from his father who beat him and told him he was subhuman. His insane mother brainwashed him and Norihiko touched him inappropriately when he was a teen. (Kids wouldn't understand consent.) If it was me, I would have packed my suitcase and said goodbye to the household but Ikurou couldn't do that. He had been conditioned to depend on Norihiko emotionally and sexually. He had nothing. The butler was his everything, the life boat in that miserable life. I don't think Ikurou loved Norihiko either. What he wanted was his father's love. He wanted it to the point where he even desired to exchange places with Ranzo because that was how fvcking miserable his life was.
In many ways, I felt way more sorry for him than Ranzo who didn't know enough to understand pain and sorrow.

I feel sorry for her. She never asked for this, and to have ur husband cheat and with a man on top of that is a big slap to the face. He lies, Cold hearted, sorry excuse for a man to put someone through his fucked up life like that. I hope she divorces him and ghost outta there. I think this is a first where i dislike the seme and uke. Im cheering for ranzo tho. He needs happiness and some help. The uke need to learn and to think for himself and not care what others think and allow them to drown him in ideals that wasn't meant for him or wanted by him in the first place. Also wen he believed the seme that he didn put that hit on his own bro, He lost my sympathy bcuz everything was so damn suspicious and out there to make him to even think he was tellin the truth was just bogus. It was a obvious lie and he allowed himself to believe it which is just selfish in my eyes.