The Tyranny of Socks

I really liked this story, and particularly the way Cassie and Kathleen had the sort of partnership that Sam and Dean have, with Cassie being the Sam of them and Kathleen being more Deanish. And that the story was about Kathleen trying to understand what the Winchesters do for her own reasons. Which brought the boys into the story, even if they weren't there in person.