His Prince Submits (The Veiled Court, 1) by Marie Medina
Alexander, the crown prince of the Fey, is awakened in the middle of the night and summoned to his father’s chambers. He worries his father might be dying, but he soon learns of a very different tragedy. Every man and woman among the Fey has a cariad, another person who will make them complete, according to legend. Alexander finds out within moments not only that his cariad is a man but also that the king banished this helpless young man from the Fey realm ten years ago in a selfish act of prejudice and superstition. Furious and frantic, Alexander sets out to find the man who holds the other half of his heart—and bring him home.