From the artist's page:
「デートだよ、あずにゃんっｖ」「も～！デートじゃありません！」
Rough translation:("It's a date, Azunyan *peace sign?*" "Gee~z! It's not a date!") So I figured the yuri tag was appropriate. Plus, it's tagged with yuri on their page to boot.

Leggings are nowhere to be seen on this page. Changing the tags to reflect the correct legwear depicted in the image.

RiderFan said:

Leggings are nowhere to be seen on this page. Changing the tags to reflect the correct legwear depicted in the image.

Thanks for that, I should have checked the tag wiki instead of assuming that's what they were. Sorry for the trouble.