The sudden, and admittedly rather operatic, scream of, “I’m on the moon, I’m on the moon!” made Severus jerk the knife away from Harry’s neck before he could accidentally cut it. He stared in the direction it came from, and after several moments, he shook his head. “And that, boy, is why gags were invented,” he muttered in Harry’s ear. Harry giggled in reply, the sound muffled by the gag, and Severus got the impression that he would’ve gotten a conciliatory pat if Harry hadn’t been rather incapable of it at that moment.