>>4460925
It's already been shown that just Kanoko confessing to Hime is enough to hurt Sumika, regardless of the outcome. Kanoko can't pursue Hime while also taking care of Sumika's feelings at the same time. She has to choose one for now and it seems she's done that, her relationship with Hime is in a much better place now so she isn't in a hurry to confess anyway.
>And it would fit perfectly with the "try to understand each other to build the best relationship you can" theme the latest chapter shat on the series.
Sumika has already done that, that's why Kanoko said it's her turn to do something for her.