User blog comment:B214/Volume 22 spoilers/@comment-73.46.6.122-20160906202532/@comment-9595671-20160907030354

I think B214 already mentioned that Ishibumi doesn't have any plans for Kiyome... which I honestly feel is odd because she gained a crush on Issei.

Then again, Tsubasa has a crush on Issei too and it might stay that way cause she seems too scared of some of the girls in his harem (mostly Rias and Akeno) to say anything. So it may not be that odd.