Why does Natalia drink Vincent’s blood? And what is it doing to her?
From Protector of the Grey House:
“Take three swallows.”
Crimson spilled from his open wound. Natalia’s hands went to his arm; one near the elbow, the other gripping his fingers. She brought the bleeding wrist to her mouth, breathing deep to calm her doubt. She closed her eyes as her lips closed around the wound. Vincent’s sigh of pleasure was a whisper past her ear. She sucked at his wound carefully, not wanting to have a mouth full of blood.
His salty, coppery blood spilled over her tongue and down her throat. It wasn’t pleasant, but it wasn’t disgusting either. She took her three swallows and pulled back, trying not to react badly. She was able to contain her distaste long enough for him to turn her around, and by then the taste was mostly gone. There was a small tremor in his face; he seemed to be clenching his jaw. Natalia wondered at the barely suppressed emotions she saw swimming under the surface, but her head swam, and her vision blurred, and she waited for him to tell her what to do next.