I'd like to see a lead-up chapter from Miu's point of view as well as maybe another chapter showing how things developed later on. Minase Ruruu's works have the same issue a lot of others have where they either show the beginning of a relationship or the development and problems of a relationship but not both. In cases like this one especially I think it could be a lot better that way.
God yes, the plot was so strange to me. She goes to crying during her confession to all out sucking the other girl's boobs lol??? PWP (Plot? What plot?)!!
Also another part that bothered me was when the Ayabe says, "You are the sole person I don't want getting that (her liking a guy classmate) confused." She purposely tries to get guys to like her so that no one will look at Kiyomi, BUT she doesn't want Kiyomi to get the wrong idea??
Normally I'd agree with you but I think in this case it makes enough sense. If Miu has been not only hiding her true feelings for a long time but also having to put up another act altogether to divert the attention of the guys from Kiyomi she's probably going to easily get carried away considering she's a teenager. And her crying and such probably wasn't (completely at least) an act but her legitimately worrying about Kiyomi's reaction. As for the "You are the sole person I don't want getting that (her liking a guy classmate) confused." bit, you should remember she's a teenage girl and on top of that she was obviously confused about her feelings at first (she even states as much) so she's not exactly going to be the most rational person on what to do.