Cas was not having a good day.

He'd been relaxing, curled up with Gabriel after having his wings groomed when Dean and Sam both insistently called him over and over and over again.

Sighing in exasperation, he flew to their location and told their "brilliant" plan to release Lucifer.

Not through his cage, but through prayer.

"After all," Dean smirked, "the devil was once an angel too."

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