More on Anthony and how he feels about Natalia.
From Protector of the Grey House:
Anthony was watching the scene in front of him with growing trepidation, understanding what it meant that Mierka and Joseph were protecting the human from their master. Anthony started to shake. Should he step out of line too much regarding Natalia, he would have Vincent’s most powerful allies against him. His discomfort eased though, as he realized the inverse was true as well. If she were to betray Vincent or any one of his top people, her pain would be infinite. She had integrated herself well into this household. Should she step out of line, her punishment would be glorious. Anthony settled into his skin and his place and waited to see if he were needed.
Cat Stark 