Its not like he can see the extrem reactions, now is it? He is dense but to his defense these girls did get the education to hide their feelings flom plain sight.
I know, I'm probably alone with this and its delusional from my side, but I hope Yuri gets herself together, clinging to her love for miku one-sama and ascends past both of her other twoselfs and does not fall in love with Satou and rather stay friends or in the rival situation they were in before.