It is not funny to draw the Dark Mark on someone's arm while they are sleeping. (Even though it is)
Harry glanced down at his best friend, Ron Weasley. Ron really was asking for it, sleeping with his sleeves up near Harry. Smiling in a slightly maniacal way, he began to draw...
Harry was nearly done when his other best friend, Hermione, noticed he was drawing on Ron's arm during one of the lazy History of Magic classes the fifth year Gryffindors and Slytherins were taking together. "Harry! Stop that!" She said shrilly, and Ron twitched in his sleep.
"Silencio," Harry cast surely. "Now hush, I'm nearly done." This spectacle caught the attention of most of the fifth years.
"Harry?" Asked Neville, not stuttering one bit. Harry was proud. "What are you doing?"
"I," he announced importantly, "am making art." Hermione made a choking noise as Harry finished.
"Okay," Harry released Hermione from the spell.
"Harry, that's the Dark Mark! It's inappropriate!" This attracted the attention of all the students. Binns droned on about Goblin Wars.
Harry quickly pointed his wand at himself, turning himself transparent, before tying his hands together. "Okay, nobody's allowed to talk to Ron. Now, someone wake him up." Hermione kicked Ron's ankle and he snorted awake.
He looked to the side and saw that Harry was missing.
"Hermione! Where's Harry?" She ignored him.
"Neville? Dean? Seamus? Where's Harry?" Nobody answered. "Harry! What are you doing sat by Malfoy?"
Everyone turned to look. There Harry was, sat by Draco Malfoy. "Don't pretend you care, Ron," Harry sighed, something which had been perfected during his Emo Phase. "Like you don't know!"
"No, seriously, mate."
"Like you don't remember you sold me out to Voldemort!" The whole class choked as one. "And as punishment...he gave me to Malfoy as his sex slave, who then killed me, binding me to him forever." There were muffled snorts and giggles around the room.
"But I wouldn't sell you out, look!" Ron pulled up his sleeve and screamed in a high-pitched manner, not unlike a little girl. However, the words that next came from his mouth were not appropriate for little girls to be using or hearing.
And that was when Ron fainted.
"Quick," Harry said with giggles, undoing the ropes and making himself naturally coloured once more. "Now, when he wakes up, pretend nothing happened." He put Ron back in his chair, and wiped the Mark off his arm.
"Harry? Are you okay? Not Malfoy's sex slave? Or dead?"
Harry gave Ron a look that said 'are-you-insane-or-otherwise-mentally-disturbed'. "No, Ron."
"And I don't have the Dark Mark?"
"I certainly hope you don't."
"Good. Hey, Harry?"
"Yes, Ron?"
"Why is there rope over by Malfoy's chair?"
"No reason."
"Okay."