This is gonna be really vague but I read a doujin a couple months ago and I can't find it again. The main part of it was that this girl is wearing her panties rolled down a little bit under her skirt at school because her girlfriend wanted her to? I've been looking but I can't seem to find it again, especially because I just sort of stumbled across it the first time, but I'm sure it was here on Dynasty.
Other information that I'm less sure about: the girls weren't from anything else, they were high school aged or at least looked like they were, it started off in the library, and I think their uniforms had a cardigan? Sorry my memory is so bad but if anyone knows it I'd be super grateful!