Harry's assumption was correct in that it wasn't any problem for Sirius to bring Narcissa in once a week for private tutoring with him and Hermione. The only difficulty was in making sure she was undetected by Draco and his sycophants. They both enjoyed the lessons, not only the ones in Pureblood etiquette and traditions, but, the deeper lessons in the personalities and alliances of the Wizarding World. Harry was surprised to learn that there were alliances between the Potters and the Parkinson Families; as well as with the Goyle Family; along with the expected ties to families considered "light" like the Weasleys (he smothered a smirk), the Prewetts, the Boneses and a few others. He and Hermione were both intrigued by the mention of "pets" that Narcissa touched on; she wouldn't give any details, saying it was a subject for a future lesson, but, she did make it clear that she wasn't talking about cats and owls.