Fics like Cadentibus Astris

King Rodor of Nemeth adopts the two fae children found in his land. Young Kal and Kara grow up in his court as members of his family, along with his daughter Mithian. But now that his children are growing a diplomatic party to their allies in Camelot is in order. Or the Kara pretends to be the bastard child of a king and ends up being pushed into an arranged marriage with the Lady Morgana fic.

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