From Protector of the Grey House:
Last night’s encounter had left him wanting. She controlled him well, reminding him of Lorraine’s abilities, but when she relinquished control, he had to remind himself that he could not do to her what he could do to his sire. Natalia was human and much too fragile to take the brunt of the more animal aspects of his nature. He held back, containing his primeval appetites, reassuring himself with the knowledge that he could have her whenever he needed her. Last night, it had been enough. Tonight, it barely pacified his hunger, skimming just the barest need off a mountain of want. He would have to do something about this soon, or risk killing and changing Natalia against her will. An image of her bathed in her own blood flowed into his consciousness and overtook his mind.
Cat Stark 