New Year's Bash (Destiel)

Sam, Dean, and Castiel decide to celebrate New Year's Eve by drinking and counting down to midnight. But, as the night goes on, they find that everything becomes a blur, until they wake up with no memory of what happened. All they know is, Dean and Castiel woke up together. And it seems that they were… together, the night before.

They decided not to tell Sam, not until they collected more details about the night. But, as they continue gathering intel, they soon find that Dean and his angel aren't the only ones with a secret.