Fics like How To Groom Your Angel

The season is turning colder and, unexpectedly, Castiel's wings molt. When Dean and Sam see black wing feathers shed everywhere, Castiel is embarrassed. Dean confronts him about it privately and learns that an angel's wings are an intensely private thing, like seeing a human naked. But Dean is curious. Before either of them understand the implications, Castiel is allowing him to see his wings.

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