You'll love this story Black Magic by Moonlight - A Harry Potter/Anita Blake xover by Beren
Summary: Harry Potter could find trouble in paradise and when Draco sends him to St Louis for a holiday it's not paradise and there's lots of trouble. With dark magic, vampires, lycanthropes and more, who else could sort it out but Anita Blake? Harry/Nathaniel/Draco, Harry/Draco, Anita/Micah , Asher/Anita/J-C, Anita/Nathaniel,
Rated: Death Sentence - NC-17
http://www.thesilversnitch.net/tss1/viewstory.php?sid=6928&warning=6