Fics like Prince of the Ether Realms

To complete a spell, Castiel needs to marry a human. Sam, Dean, and Cas make do with a simple two-minute ceremony in the bunker's library. It means nothing, it's just a means to an end. But what begins as a shortcut for spellwork becomes something far more important, as the human Cas chooses to marry is Dean. As it happens, the shift in their relationship is very real – and the effects, one might say, are universe-bending.

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