Yeah it's like you say. I'd loved to see it become a soft yuri story. Right now I really am enjoying a slow but well develop storyline like this one. We saw them turn form stragers to friends, and how hard it's for Fujishiro deal with her feelings towards Kurokawa (sorry if I misspelled). Now, their felling are growing, and soon we'll see friends turning into lovers (I hope but it will take some time) and the problems that means.
Buuut I sure would like to see them getting more intimate
Maybe one day they'll surprise us with some beautiful yuri after all the slow roasting build up ¯_(ツ)_/¯
I'm enjoying the story but to call this "yuri" is quite a stretch. Seems solidly shoujo ai to me.