It's really hard for her to keep her depraved side from coming out, isn't it? Luckily for her, she just looks more innocent, and her human is none the wiser. I bet he doesn't even know the other reason she wants the collar.

Is what I would've been thinking if it wasn't for that other picture. I really think that it's kind of a tug of war between her human trying to get her to be honest with herself and Bianc trying to keep up the "Holy Beast" act that's known for her species (around humans and non-best friends).