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Dean literally worships his car. It’s is surprising how Dean can make something so mundane as washing his car look so…compelling.
He is efficient, careful, gentle. Under a hazy sun, without his shirt on, he looks like he is actually caressing…a lover. And as this thought flashes through his mind, Castiel feels suddenly something he is sure must be jealousy. He knows it is something he was never supposed to feel, but now he is human, and it looks like he can even be jealous of an inanimate object. He wishes those hands could be so loving with him, too.