Fics like Koinophilia

Everyone knew there was a strong correlation between an omega's physical build and their biologic cycle. Castiel didn't think that anyone would be surprised to learn that Sam, the six-foot-five, triathlon-running state prosecutor, went into heat just once a year. It should have made no sense at all that Dean, Castiel's mate, went into heat every two. And yet, somehow, it... did. It made perfect sense. So why was Dean being so secretive about it?

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