It's a Hogsmeade weekend.
Malfoy's full of plans.
Harry doesn't have the heart to tell him until the last evening.
He thinks McGonagall just did it out of spite. Anyway, his new Head of House needs the permission form signed.
Sirius hasn't been heard from in months.
And it's not like he can get his father to sign it.
Too bad Malfoy doesn't see it that way.
He's shoved through the door of Snape's office, and Snape scowls up from a stack of essays.
"I... uh..."
He gives up, and pushes the form across the desk.
And Snape signs it.