Lmao honestly you're not wrong! at first, he might be one of those typical ignorant, selfish men that, even in heterosexual relationships, could only think of what /they/ are feeling—which is immense pleasure from being inside something tight—unlike what the bottoms or women are feeling when they are having sex for the first time... though i'm not really sure what he'll become since i didn't continue the novel.
jingu is such a pathetic failure + loser and we all know it lol
i just had to single out the realistic reaction from yeowoon because i'm tired of other yaois/bls where the ukes are, despite being penetrated from behind for the first time, are feeling good SO MUCH like what the hell though sure we can acknowledge that we all have different pain tolerances and such.
meanwhile a lot of semes are like jingu who can't think of anything else than putting it in lmao.

even while reading this in the novel i actually like how realistic it is when it's shown that sex, especially anal sex in gay relationships, isn't always gonna be so immediately good and pleasurable. i like how realistic yeowoon's reactions are and how he's feeling considering that it's his first time in everything.