Fics like Who is the Lamb and Who is the Knife?

In an attempt to ensure the peace between their Kingdoms holds, the respective kings of the Demon and Angel Kingdoms wed one of each other's royal household. Prince Castiel, youngest brother of the Angel's King, is chosen for the Demon's groom. Terrified but proud, he accepts the marriage to save his people from further suffering Then he meets his future husband.

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