I've gotten further. Ren has helped Kyoko develop yet another role, this one as a bully (she got a lot of mean roles in response to Mio).

I think that he might have gotten as far as actually outright blushing, and I know that he's already smiled all day long about "small and trivial progress."

There's no doubt about the fact that he's Kuon/Corn, but that might already be common knowledge.