I'm pretty sure that Ishigami meant that Iino would never date him, not that he would never date her. Though I'm sure it'll be another dozen chapters before the misunderstanding is cleared up.
Miko is scary. At this point I feel like pairing her with Ishigami could lead to disaster as both of them are not the type to reform others and both are bad at bettering themselves without serious help.
+
Casual Miyuki and Miko chapter, huh.
It's nice to see Iino loosening up. I don't think she jokes like this even to her friends, so it's probably proof that that's how much she trusts Shirogane
Senpai-kouhai relationship of :
Ishigami and Kaguya : Supportive senpai to kouhai, Mentor-pupil
Shirogane and Iino : Sharing their weird self, Kouhai teasing her senpai