I adore, simply adore, this AU story: The Vampire in the Basement. Here is the synopsis:
While hunting one afternoon, the boys stumble upon what appears to be a corpse. When they learn it's a severely broken vampire, they take him home to do what they can to help. But of course, fate has plans for this man. Canon Couples. AU.
Michellephants' story is just fabulous. Much angst; and the story progression is true to the spirit of the story - that is to say, she doesn't rush through the important processes involved in the pursuit of "getting to the popular stuff". I highly recommend it.