A well-pressed daisy

1. Sirius went for name recognition based on evil and criminality and just hoped Harry never did the math (most likely).

2. Bella failed her NEWTs for fifteen years running and was the oldest student to leave Hogwarts when she finally passed. Bella’s NEWTs remain a Slytherin Common Room joke.

3. Bella was one of those old students who popped up ‘for a chat’ every chance she got. Until it became known she was a marked Death Eater and banned from the school. She couldn’t be before because, as Sprout said, you couldn’t ban her for having objectionable political views. You’d have to ban half the student body in that case.

4. Bella, bored as Society Wife, started a literary salon in Hogsmeade. Sirius deeply distrusts anyone who likes books that much. And she wouldn’t let him join, the harpy.

5. Slytherin Book Club.

6. Slytherin Tea Tasters Club, Hogsmeade Auxiliary.

7. Slytherin Old Students Society meetings always took place in Hogsmeade. On the weekends students were allowed to visit. So convenient, really.

8. At the urging of Narcissa, she gave Severus etiquette and piano lessons. They mostly devolved into shouting matches, but it gave Narcissa a break.