
He's had to watch the man he truly cares for sleeping with other men, all this time? ...poor guy! You got him in the end!!!!!!!

Except things had changed then.
He already made clear his intentions, already laid his hands on him, made his claim, etc.
Don't forget he let the guy have sex with his guy first, he didn't stop it when he could have told the guy to change up the blindfold first and switch out.
This was all about showing his uke that no wizard was as good as him. That what he really desired was him all along.
And it worked.

He got pregnant the night he went in to Dojin room and said he wanted to have a baby!!!!! The doctor telling Dojin off for being careless and knotting... Dojin is completely shocked. It was such a beautiful end of chapter... One hand on tummy, The other gently kissing hand... It was beauiful.

I think the Doctor was scolding Dojin for "knotting" Hyesung when he was already pregnant. A bit like the myth that having penetrative sex whilst pregnant is harmful to the unborn child maybe.
keisuke replacing Mei... hhhhhhmmmm I think it's more to it? It's obvious Keisuke loves this twin Akane, I cant help but think something happened with his memory