Oppression
"Reeeemus," Sirius whined and cast a quick look around the room to make sure no one was paying any attention. "You have to stop, it's just cruel."
"Cruel? I have no idea what you're talking about. How am I being cruel?" Anyone who did not know Remus would think he was being sincere, but Sirius knew better. Remus may sound innocent, but there was a devilish glint in his eyes.
"You're doing it on purpose aren't you? You have to be, you've been doing it for hours!"
"What? This?" Remus asked innocently and went back to sucking the sugar quill.