[...he really should stop calling Kotone by that name, since she hates it, but it's pretty much one of the only guaranteed ways to get her to talk to him.]

Kotokuma's my nickname for Kotone-kun. She's kind of cute, or she used to be, but she's gotten pretty mean. She used to like the name too, but she really hates being called it nowadays. [Aside from aforementioned way of getting her to talk to him, it's just a friendly reminder that they're friends.] She used to call me Hibichi in return, but now it's just Kiyosumi-kun or something worse.

[...Hibiecchi...]