"Sirius! What are you doing? Someone is going to see you!" Remus exclaimed as he walked through the dormitory door, only to find a tied up black dog pouting on his bed.

"What's this?" Remus asked the dog curiously, picking up a note.

"Dear Moony," Remus read aloud, "I thought you deserved some punishment. I have tied him up until you show can execute a silencing charm. We have had enough of what goes on behind those curtains, Prongs"

Remus blushed. "Shit." He said quietly, looking at the dog, "I thought you said you put the charms up! Bloody idiot."