dreams_library | Stories about sisters

I'm looking for stories that centre on characters who are sisters (preferably a pair, preferably adults), where the character relationship is a good portrayal of sisterhood, in a way that's about closeness (or distance, or a mixture of the two) rather than rivalry/jealousy (a bit of that would be ok, just not too much). I've been trying to think of stories about sisters - there are the fairy-taley portrayals of good/pretty/clever vs. bad/ugly/dull sister, which are so not what I'm after, or protagonists whose sisters exist as foils or plot devices. I'd like there to be a sense of equal partnership. (I mean, the desire to find this sort of thing came to me during an episode of Supernatural, when I started wishing I could see the parallel universe version in which the Winchesters are girls).

There's probably loads that I haven't thought of. I'd prefer genre, something quite fun and adventurous, but recs of any kind would be lovely.