The professor rolled his eyes at Black, "He’s been calling her that for years, and there’s no stopping him. Hermione’s oddly fine with it. As for the bonding, it’s all a bit of speculation, really. Werewolf magic is still very misunderstood. When we were at Hogwarts, our pack included James Potter and Peter Pettigrew, in addition to Sirius and myself, obviously. My mother was a muggle, so we didn’t share a magical bond, and I had a strenuous relationship with my father, so the pack bond never really manifested. Sirius, James, and Peter were essentially like brothers, and the wolf sort of claimed them as pack, especially after they became animagi. Bill is a little different, he was infected with enough Lycanthropy that he felt a calling for pack, and his energy matched well with my wolf, so it was a no-brainer."