Mr (Not-So) Nice Guy by remuslives23
Harry Potter/Torchwood crossover.
It has Alastor Moody and Bellatrix Lestrage in it as well as Captain Jack Harkness. It's even better than I'd hoped for and imagine how high my hopes were with such an author! Go read so that we all win from the auction.
Is it wrong that I have so much fun from the suffering of others when these auctions come up?