Do we really have to tag every art of these two being together "yuri"? Soon enough the word won't even have a meaning anymore.
Honestly, as some who also feels the Yuri tag is used a little too often on this site, I don't really see that. A cursory glance at these two with the yuri tag shows that for the most part it actually isn't being abused that much. Aside from one other case where I have removed it mostly seems to be used correctly. It just appears that a lot of people and/or artists really like to either ship these two or at least show Kiara's seemingly never-ending desire for Calli.