This is beautiful. The affection with which they were drawn makes it more intimate, and the little details such as the shape of Minerva's glasses, hands before her face, and the wispy edges of Rolanda's hair, make it feel like you are there. Your personal art style is uncommon in a very good way - I don't really see art done this way, but I like it a lot. Thanks for sharing. :)
(Maybe a late comment - but just found this through hp_girlslash and had to comment.)