Good thing i have my blocklist of people being trigger when the word yuri is posted somewhere on non yuri work. I don't care if Touka is flustered by the coach, that was stated by the start. I care about Koyumi getting flustered like her crush complimented her when her premise was she love Touka and see the coach like a love rival.
Edit : Well I will just wait to see if the author really decide to make Koyumi swing or not.