I'll provide as many details as i can remember. It was a lesbian story about a black lady that gets attacked one night and ends up being saved by her white guardian angel. i think the story is set sometime in the 70's because i believe she was a black panther. in order to get her angel's attention she jumps from a window so her angel can save her. She ends up seducing her angel. they fall in love and the angel ends of becoming human in the end. I can't remember if i read it in the lesbian or non-human categories.