end of chapter 4, it's not because it's not showed that it didn't happen (p 24 till the end)
uke : "stop" (several time); 'I didn't like doing it that way"; his body language make it clear he is non-consentant.
seme : "I'm really sorry, it won't happen again"; "I'm.... disgusting", " I completely crossed the line. I'm really sorry"
even seme realise he fucked up big time (even without talking about rape he clearly forced himself on the uke who clearly didn't want to have sex).
And, in MY opinion, the seme is not cute at all: he used the fact that the uke was drunk to try to fuck him, he clearly stalked him, he's very "pushy",he imposes himself on the uke in every way possible. Irl, I would suffocate if someone act like that with me.
It bothered me too. I was wondering if I misread it. But yes that was wrong. Instead of making him understand what he didn't understand, he was being pushy (saying it mildly). Also agree with what you said about when they started - the way he tried to get his feelings accross the mc - the first drunk night.

like it until the rape
so not so cute