Garnet and Silver - L. T. Getty - Bog

Jane and Chloe are bedazzled by a newcomer to their high school, and he has a secret: he's the prince of the fae realm, who is only allowed to walk in our realm once ever ten years. In that time, if he can find a human mortal fit to be faerie queen, she can break the binding that keeps his realm and subjects from entering ours. They'll learn that some times, the prince is banished for a good reason.