A Demon's Plaything. The Elite Guard Novels, #4

Previously Released in Love Potion AnthologyLilith has spent her life in the ruins of her mother's court that the Horde destroyed. Summoned to her father's court, her entire world is turned upside down. Her father has offered her to the Horde to pay the tithe owed to them, and she'd rather die before bowing to the Horde, but if she intends to keep her secrets, she will kneel to the murderous Horde who destroyed her kingdom, and left it in ruins.
Asrian agreed to take one for the team, to marry one of the elusive, wanted brides of the lesser courts. He expected a spoiled, pampered princess, and anything other than what he finds waiting for him in the Shadow Court.