What does Vincent give Natalia that prompts this answer?
From Protector of the Grey House:
Vincent cocked his head, wondering at her two little words. “Natalia?”
She looked into his clear blue eyes, seeing his unspoken words. She had become adept at reading her lover. “I can’t accept this Vincent. I don’t deserve this. I’m not like you. I’m not a vampire. This shouldn’t be mine.”
Undeterred, Vincent stepped forward, caressing her cheek softly. “Have any of the words I’ve uttered been a lie?”