From The Grey House, Book Two, Inside the Grey House:
Vincent allowed her actions, savoring the smell of her blood, enjoying playing the submissive. It had always been the same between them. He could over power her, take what he wanted and leave her whimpering for more, but had no desire to do so. Since their first encounter, she held the dominant position. After nearly three hundred years, neither felt the need to change roles. The massive vampire allowed the diminutive woman to do as she pleased, feeling his wants and desires growing.