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She likes it with Sam because he knows what she is, he's tasted of it, so whatever it is he sees when he looks at her, at least he believes it to be a person.
But she likes it with Dean because, whatever he thinks of her, however little he thinks of her, she knows he's seen her.
It's not the face she wants, the face she expects when she happens past a mirror, but it is the face she has.
It has to count for something.
