Not really the seme loved the uke’s personality not his body. He was so in love the thought of the uke having a dick and him feeling disgusted didn’t cross his mind. It’s the reality and that’s why its such a masterpiece. Many straight boys in mangas would be like “omg the uke is cute I am not gay but I can fuck a guy’s ass” but this manga showed that it isn’t that easy to switch. After he overcame and realised the fact that the uke is a MAN who he feels more than anything, he could do it.
What the hell, after looking at his body all you can say is "Sorry" ? What are you hoping for, of course Saya is a man in the first place