Fics like It's a Small World (aka the Worst Ride at Disneyland)

Dean's life didn't start out great. With his mom dying and his father taking him and Sam on wild goose chase after wilder goose chase to track down her killer until Sam couldn't take it anymore and ran off, it pretty much sucked. But now he has Cas. And Cas is great--perfect, even--definitely the best thing that's ever happened to him, even if he isn't quite human. He's been living so long in domestic bliss that he completely forgot to be worried about waiting for the other shoe to drop. Which is, of course, when his giant of a brother strolls back into his life sending Dean into a panic that he and Cas will have to uproot their perfect apple pie life if Sam finds out Cas' big secret.

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