McGonagall stood in front of the four of them.

"Can you explain this?" She held up the moving photograph of the four of them, underneath etched Class of '76. "Lupin?"

"I'm sorry, Professor."

"Black?"

He didn't seem to notice. McGonagall pursed her lips and turned on Peter.

"Pettigrew, I would have thought –"

"I didn't know anything, Professor, I swear!"

"Detention, Pettigrew. Potter, I suppose you didn't know either," she said sarcastically.

"I knew."

"And?"

"I'm very sorry."

"You're with me this weekend, all of you, first thing Saturday, first thing Sunday and I'm letting you off easy. You've gone far enough with your silly pranks."

Remus mumbled something, and McGonagall pointed to the door. "Out. First thing, don't forget."

The filed out. Sirius straightened up a little. "You owe me."

"What?"

"You owe me money, I won that bet."

"What are you, broke? Need a fix?" James said. "Couldn't you plead a favour from Lilikins?"

Sirius shook his head. "She cut me out. I need money."

"No," James said.

"You did cheat," Remus said fairly.

"I won," Sirius said. Peter reached for his bag.