Tearjerker: Elegy for a Demon Lover. Having to kill an immortal energy-parasite— in this case, an incubus— is one thing. Having to kill an immortal energy-parasite you're in love with is another. But having to kill an immortal energy-parasite you're in love with, who not only may be incapable of realizing the harm he's causing, but loves you so much that the only way to kill him is through the pain of your rejecting him? The most poignant story in the book.
Woobie: If there's something bad that can happen to Booth, short of death, it will.