I have this feeling after reading chappy 20 is that... Senpai would give his apology as a confession (or might be taken as a confession from other people's perspective) and that things would go downhill and all that...
... I really hate this guy right now... I hate that senpai. And no, I don't want another fucking debate...
Let. Me. Hate. Him.
Why would there be a debate? he is the kind of asshole that doesn't know he is an asshole, aka:the worst kind
He actually thinks he is funny, not an a-hole, but you got it right about the worst kind. Also he better NOT confess to the MC or shit will get real!
I hope this ain't one of those cases where the author herself (?) doesn't understand how terrible a character is, and thinks that he is a nice, sympathetic guy as shown by how he expressed a "wish" to apologise. Because in that case, there's no salvation for the series any more. I don't mind drama, in fact I like it, but when the het drama so dominates the yuri element it's just ridiculous (for a series listed as yuri). As a number of people have mentioned, I would have much preferred a story about Pika-chan and Naomi-senpai.
I don't hate Youko, but she should just get over Maki. She's not worth it. (Clearly, since her taste is so bad.)