From Inside the Grey House:
Vincent let the argument drop, assigning Charlie as her bodyguard. That didn’t work since the next time she left was the day of the full moon, shortly before nightfall when Charlie was incapacitated. She returned once more after midnight, but less bruised than before, sporting a satisfied grin. Vincent rushed her into his study upon her return, thinking to lecture and yell. At the first opportunity, she knelt before him, pulled down his pants and sucked him dry. She dominated him that night, and he relished in her abilities, giving in to her every desire; showing her a few of his own.
Cat Stark 