From The Grey House:
Joseph had lifted her up. He used the wall to support her and trailed kisses and nibbles down her neck to her chest. He gently bit her breast, drinking her sweet blood. He pulled away, retracting his fangs before she could see them. She smiled an absolutely evil smile and showed him her fangs, asking ‘Isn’t it polite to ask before you take another vampire’s blood?’ She took his blood then, but not as gently. When Joseph told Vincent, his boss laughed, not in the least bit surprised.