(Left under Susan's pillow sometime late Saturday morning. Hexed to be read only by her - anyone else who tries to read the note will experience an incredibly uncomfortable stinging sensation in their eyes, followed by the parchment going blank)
Susan -
I want to say thank you for talking to me about the D.A. a few weeks ago. If things were a bit different here, I think I really would have liked to join in again. But I've decided that it's best if I follow my original intentions and get out of Hogwarts, while there's still a slim chance to do so.
And, I hate to ask, but I can't take Cinnamon and Sticks with me. And Sabina. Would you be able to mind them, until I can take them back? Or if you're squeamish with rats, see if someone else might?
I'm sorry. Please, all of you be careful. It's really brave, what you're doing.