Harry couldn't believe it. He just couldn't believe it, not even for a minute. He knew Snape had to have done something to Meg, but he couldn't think what. He was in his dorm room, lying on his bed, thinking about everything that had happened at the Yule Ball. Snape, marrying Meg…He had talked about it to Andrea, Ron, and Hermione about it for hours on end in the common room until McGonagall came in and told them to shut up and go to bed. They did, but Harry lay awake.

What if Snape really IS using a Love Potion? Harry thought. Dumbledore hadn't acted like it; he seemed to think it was natural love, with no spells included…Harry knew better. Maybe he was just using one of those Romance Charms on her. Or maybe…Harry felt like he was slapped in the face. What if Snape was using the Imperius Curse on Meg? He would be sent to Azkaban…

The next morning, Harry woke up out of a fitful sleep. He hadn't fallen asleep until midnight; he had been too absorbed in his thoughts. He didn't want his Potions teacher ever to marry Meg Smith, because they just seemed too unlikely. Harry went over to Hedwig's cage.

He sat down at one of the tables in the common room and wrote:

Sirius,

We had the Yule Ball last night. I went with Hermione, and Ron went with Andrea. Something really weird happened, though. You know Snape, my stupid Potions teacher. Do you remember going to school with this girl named Meg Smith? Well, now she's a teacher at Hogwarts, and Snape's done something to her. They've just announced their ENGAGEMENT. Snape is loopy for her, believe me. I don't know if you've heard of Gilderoy Lockhart, but he likes her too. He thinks he's so cool just because he's totally famous and he has all these books written about him, by him.

Anyway, Snape probably fed Smith a Love Potion, but he might do the Imperius Curse. You never know with him. Now Dumbledore's setting up their wedding for them. He kept calling them "you two" and saying they didn't have to worry about a thing. I know he thinks Snape didn't do anything, but I know Snape's been giving Meg something. I think they were discussing their engagement while they were supposed to be dancing (because it looked like they were).

I don't know why I'm asking you this, but do you know how to get rid of a Love Potion? I don't think we can wait for it to wear off. Dumbledore said the wedding is one week from now. I don't think you should come and watch the wedding, somebody might try and re-arrest you, you know, but I'll tell you about what happened after the wedding is over. Bye, hope you're feeling good.

Harry

"Hedwig," said Harry. "Give this letter to Sirius, okay?"

Harry's owl, Hedwig, hooted to say that she would do that, while Harry tied the letter around her leg so she could fly with it. Then he went downstairs for school.