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Stay away from the light-beds. Stay in the deep.
It is the first thing hatchlings are taught the moment their fans unfurl and they can swim without their parents to buoy them along. It is the first rule, the first law. It is the beginning of every boogey-monster bedtime story told when they settle against the cliffs to sleep.
Castiel should have listened better.
(Dean's Drabbles - certain scenes from Dean's POV.)