Uke is probably the easy going type.
Why? You wanted him to be an ass? Or you think losers with self confidence are better than those winners without it? Having self confidence is not necessarily a good thing after all. Ktbn.
I do not know what you have in mind to make those assumptions... ┑(￣Д ￣)┍
For me, to be able to enjoy some story, it needs to contain a portion of reality (not too much, because it is a manga, if I want a true realistic story I read a newspaper), but here the uke simply changed his mind? He never liked men, the seme is tall and handsome, but for a straight man that does not mean anything, what happened so that he wants to have sex with him? (⊙…⊙ )
It does not seem convincing. Just an excuse to show two men fucking. What is ok for me, but the mangaka ruined her story with that sudden change of plot. （￣へ￣）
Btw, English is not my first language, so I don't know what Ktbn means.
Too easy, the younger one should have tried harder to get him...