I got so wrapped up in rediscovering
fembuck's fic that I left a huge hole in my Birds of Prey post:
The Way We Were by BG, Barbara/Helena, Very Mature is a long, thoughtful romance with actual plot (!!). I think what's most startling about BG's work is its emotional depth -- s/he really takes time with these characters. There are several other BOP fics by BG on Passion & Perfection. They're all worth reading, all variations on the same theme with different plots that really are secondary to the character development.
Does BG have an LJ? 'cause I'd like to see her take on other fandoms.