The Half-Vampire's Challenge

Sylvia, a werewolf princess, is framed by her stepmother and reduced to a captive lot for auction in the black market. She is bought by Vincent, a mysterious mogul with sway over both the legal and criminal worlds, who trains her into his exclusive secret operative. Holding the promise of revenge and her mother's rescue as leverage, Vincent dispatches Sylvia to seduce his sworn enemy — the head of the Norton vampire clan. After three years of training, Sylvia, who has long fallen deeply in love with Vincent, is still coldly sent off to carry out the mission. Vincent is convinced he will never care for a mere tool, but when he sees every skill he personally taught Sylvia wielded on another man, he can no longer keep his composure.