Human Mate of The Triplet vampire kings

The mate of the mighty Triplet Vampire Kings of Everleen is expected to have a special blood, the portion, that is the key to unlocking the vampire kings most unimaginable powers. All young females of vampire blood are submitting samples of their blood to the big palace in hope of being the special one, the mate of the Vampire Kings. Gabriella, a young human servant, gets entrusted with her mistress's blood to take to the king's service men that would deliver it to the palace. She accidentally falls on the way and spills some of the mistress's blood. Afraid of going back to fetch more, Gabriella refills the bottle with her own blood. Several days later, officials of the Vampire kings show up with news that the blood taken to the palace was the most special there has ever been.