Wait
This ain't Yuri
Not yet, anyway.
It's by an author known for sometimes heavy-duty yuri, but at the moment it's just a story trembling on the brink of yuri, quivering with anticipation, as it were, its eyes half-shut as yuri-subtext (at least) gets closer and closer, so close the story can smell the sweet, musky scent of the yuri, wondering what will happen afterwards if the story's lips actually were to touch the yuri, ever so lightly, thereby changing the nature of the story, or, perhaps, just allowing the story to realize what has been its true inner nature all along, either way that butterfly touch of lips transforming the story's world forever.
But you're right--at this point it's just an extremely well-crafted and engaging story about the developing relationship between two women, not actually yuri.