Fics like The Fifth Son

King Zachariah is tired of humans and wants nothing more than to go to war against them. Unfortunately, he can't declare war without a reason, or every nation will turn on him. His solution? Kill two birds with one stone. He'll offer his least attractive son in marriage to Dean, the human crown prince. The prince will refuse, Zachariah can frame the rejection as an unforgivable insult to the royal family, and his angel army can finally invade the weaker human kingdom. There's just one problem. Castiel may not be a very attractive angel, but by human standards, he's absolutely gorgeous.

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