"Potter, Black, I don't suppose there's a reason for the two of you to be running on the corridors this late at night?"
The two figures froze, hating the fact that they hadn't thought to take the invisibility cloak with them. That would have made it so much easier, and they definitely wouldn't have gotten caught.
"Professor," Sirius said, turning around quickly with a disarming smile that he knew didn't fool McGonagall for a minute. "What are you doing here?"
"I believe the question was, what the two of you are doing here," McGonagall said, eyebrow raised expectantly.
"We were hungry-"
"Lost my textbook-"
James and Sirius stopped when they realised they were speaking at the same time. It took them a moment to realise that they had said completely different things.
The look on McGonagall's face was enough to tell them that they weren't going to get out of this.
"I believe you know what happens after this? Follow me."
Written for the September Back to School Challenge: interaction with a teacher