Anastasyia's Links
He's a customer and he pays well, so Ana can't ask for more. Used to stubborn people, she deals with Azrael exceptionally well, and is perhaps one of the few people not afraid of insulting him. She knows very well that he wouldn't hurt her- since there's no one else brave enough to get as close as to fix his artificial limbs. She's also very interested in hearing his stories of the battlefield.
Ana is very much a necessity in his mind. Azrael needs very few people, and the female is one of them- therefore she's within his protection. Not usually fond of humans, he makes an exception for Ana and her skills.