What is a short summary of the story, Demon Lover, from the collection, Trash: Stories?

In the story, Demon Lover, the narrator is visited in the night by her ex-girlfriend, Katy. Katy is long-dead from an overdose, but she still feels real to the narrator. The narrator is still turned on by her “demon” ex-girlfriend, as she thinks about the circumstances surrounding their relationship and Katy’s death.