Fics like The Guardian

A dead judge. A witness. An infallible assassin. Dean Winchester is a hunter-turned-U.S. Marshal. Basically, he gets paid to protect people from monsters, human or otherwise. He didn’t sign up for dealing with a snarky, blue-eyed pain in the ass with an apparent death wish, an assassin, or hard-headed little sisters. Well, technically he did sign up for that last one. They all did. Orphaned at Singer’s Home for Children Displaced by the Supernatural they adopted each other. Sam may be his only sibling, but as far as he's concerned, he has five. For them-Sam, Charlie, Benny, Claire, and Jo-he needs to make it out of this alive. Castiel Milton is a fallen angel in a world where the supernatural live in the open. As exciting as it sounds on paper, his life is a series of one monotonous moment after another; he writes speeches for big names with even bigger egos, has a cat that only sleeps in the sink no matter what he does to try to make her stop, and in his free time he looks for his sister who disappeared when he was a kid. When he witnesses the murder of a federal judge, his simple little life implodes. Nothing is as it once was and if he stops to catch his breath, he’s dead.