I guess you forgot that uke started to like him.
Yes, he did but imagine, you like someone but they treated you like trash by abusing their power on you. You overworked yourself and felt disrespected to the point that you cried and felt bitter about everything about that person. You came to hate them. The next morning after drinking, you found yourself sleeping next to this person, so how'd you reaction turns out? This is exactly what happens to the uke.
Having sex with someone you're unsure of, especially when you hate them too, how can the uke's respond is comedic? "Oh no, I just slept with him, I'm so stuuupid!! ┑(￣Д ￣)┍" "I wish not to see him (￣∇￣") "
Anyway, sorry if I seem rude lol I literally just want to vent how confused I am lmao. I mean, the uke can still react that way, but the way it was drawn should give some heavy atmosphere, indicating a serious situation but it's not (=・ω・=)
Honestly, what is this? The uke just got mentally drained and clearly heart broken before to the point that he cried and got bitter with the seme but he acts like the usual comedic way after finding out he accidentally sleeps with him? Not even furious, disgusted??? What is his character anymore?? Lol