I get where you are coming from. The uke is selfish. But just wanted to clear something. About the seme asking him out and him rejected him, you have think in his perspective. The seme kept telling the uke to have a relationship with him before then just out of sense of obligation, he had to take "responsibility". And all of a sudden the seme asks him out when he saw a vulnerable side of uke. it makes sense for the uke to think he asked him out only due to pity. So i get why uke rejected him that way. And later he came back to him again is probably because the seme is the only person he could rely on. It didn't seem like he had friends in college with the way they were taking about him.
Not trying to change your mind to like the story or offend you anything. I just felt sorry for the uke while reading the manga so wanted you to see a little bit of my perspective I guess. Sorry for the long reply!
really the only thing i was annoyed by was how the uke told seme that he didnt want to see him anymore but came running back when he was dumped that pissed me off the most
I totally disagree,all his life he has never been accepted when things like that happen, you tend to shut off your feelings and tell yourself it doesn't matter.
The Sensei was the first person to accept him for who he was and then he tried to leave him but Senpai begged him saying even just a physical relationship is ok. The thought of being unloved, undesired and lonely for your whole life is a horrifying thought.
So even being loved and desired for one night at a time becomes acceptable. But what he really wants is someone to love and accept for who he is, not out of duty or pity, like his Khoai was first implying. Sleeping around like that is wrong but I don't think he meant to hurt anyone he just didn't know how else to receive love.
not really liking the last uke he just sleeps around with people and when the seme asked to date him he said "no i wont be coming here" and starts to ignore him then suddenly when the senpai dumps him he goes back to him crying about it ,like wtf he pretty inconsiderate of the semes feelings and does what suits his liking which is pretty selfish.when the seme tells him he likes him hes like oh your just pitying me oh your just feeling sorry for me im here like BRUH .yeah dont really like him.though i liked the other stories