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Prompt: I like the idea of Dean and Cas getting old together. But Dean would get insecure about his gray hair and Cas would let his hair gray to comfort him even though he's an angel.
His angel looks damn good like this – salt and pepper at the temples like a fuckin’ professor or something. Just, like, distinguished. Dean tells him all the time that his gray hair is freaking hot, that it makes it even harder for Dean to keep his hands off him. Seriously – since Cas started going noticeably gray, Dean’s been dragging him into bed every chance he gets.
Cas knows, and deep down inside Dean knows too, that the reason Dean is so turned on by his gray hair is less about how it makes Cas look and more about what it means – Cas is staying. Cas is staying. Cas is staying.