From Protector of the Grey House:
When Natalia drank his blood one week later, Vincent couldn’t tell if he had her under his control or not. She was generally willing to try anything he suggested; this time was no different. Or so he thought. Half an hour after giving her his blood he pulled away frustrated, seething with annoyance. He was downstairs in the security room confronting Joseph in seconds.
“Break my hold on her.” His annoyance showed in his voice. Joseph was not worried; Vincent was annoyed with the situation.
“You wish me to break your control on your woman? And why would that be?” Joseph smiled and watched as Vincent’s hands formed into fists.
“I want a willing, experienced woman with a mind of her own. Not a child who needs to be told what to do with every movement.” He paused, took a breath, and calmed his raging emotions. “Go break my hold.”
Joseph’s smile grew wider. “Does this order supersede the order that I’m not to touch her while she’s yours?”
Vincent grabbed Joseph by his shirt, pulled his friend into a standing position, and stared him down. “I could locate Mierka and have both women for the night. Would you prefer that?”
Joseph pulled his master’s hands off his shirt, and smoothed out the wrinkles. He indicated that Vincent should lead the way and followed his master up the stairs to the bedroom. Vincent’s hold on Natalia was easily broken, as she wanted her usual lover and not a stand in.