Fics like We Can't Keep this Undercover

Cas and Dean have been dating for a month, but Sam is clueless, despite the fact that they haven't been hiding that they're together. Or so they thought. After reflecting on Sam's obliviousness, Dean deviously suggests he and Cas try to be as obvious as possible to see how long it’ll take for Sam to realize. Cue Dean and Cas' escalating attempts to prove they're together, and Sam mistaking every scenario until Dean just can't take it anymore.

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