The story is "My Pretty Rose Tree"-- based, obviously, on the William Blake poem. Luke's posting quickly drew attention from some of the lovely Blake-a-holics. you can view the story here. Check it out, it's free and all, and Blake is Great Literature.
This is not the first time I've sourced Blake in my work--his writing and his art have both been huge inspirations to me since I was in high school. Sixsmiths readers will observe that the graphic novel closes with a quote from Blake's Satanic Proverbs.