Ooh the tension as Koito and Saeki both ask each other about their relationship to Nanami... To say you could cut the air with a knife would be an understatement. With how much is remaining unspoken between them the knife would probably break.
I would have loved for Yuu to tell Saeki that Touko confessed to her and has kissed her just to see her reaction. Well, I'm only rereading this as a primer to Regarding Saeki Sayaka