Bella was probably legitimately a sociopath. If she ever found out that Sirius cared for something, she would destroy it. They had a book they loved when they were probably nine or ten. It had been abandoned at the studio they went to for their ballet lessons, so they picked it up. The Blacks were strict about literature, because they knew that the wrong books would give their children the wrong ideas. Of course, the book Sirius loved was one of those "wrong’ books. It had been hidden under their mattress so that no one would find it. Bella knew what would happen if she told Sirius’ mother about the book when she found it, but she told her anyway. She watched and laughed while Walburga punished Sirius. 