It was Saturday. Normally, Ron Weasley would be happy. No classes - no work. It should be a brilliant day. But, of course, it wasn't. This particular Saturday was the Saturday that he had to comply to Kalilina's wishes. 'I knew I should've taken my time!' Ron grumbled. He blamed the fact that he had eaten almost two plates prior to the start of the challenge.

"Wakey, wakey, Ronnie-poo," cooed a voice in his ear. Ron opened his eyes and screamed when a pair of crystal blue eyes were in his face.

"Bloody hell, Kali!" Ron wheezed. "How did you even get in here anyway?"

"Well, seeing as boys don't have a charm on their stairs like us, I walked up like a normal person," she explained. "Now get up, today's a very special day."

Ron paled. It was Saturday, wasn't it? It was the day he had to flash his underwear to the whole population of Hogwarts.

"Kali, can't you call this off?" Ron pleaded. "I'll do anything else, please!"

"Nope, now get up," Kalilina said, pulling her red-headed best friend up out of his bed. She dragged Ron all the way through the common room, through the corridors and to the Great Hall. A lot people were there, for a Saturday. 'Perfect' Kalilina grinned evilly. She put Ron in the centre of the Great Hall. She said a spell and Ron's pajamas disappeared. The Hall erupted with laughter as Ron turned as red as his hair.

He'd chosen the wrong day to wear his boxer briefs.

"Come on, Ronald, we don't have all day," Kalilina giggled, though her eyes were shining with mischief.

"How do you know I won't go back to my dorm?" Ron asked her.

"One, the Fat Lady won't let you in. Two, I've locked all broom closests and abandoned classrooms, so don't even try it. And Three, I'm making Harry join you, so you won't be alone."

Harry, who was previously laughing, choked on his egg and spluttered out, "I did not agree to this! Kali!"

Kalilina pulled Harry from his seat and made his clothes disappear too. Harry was as red as Ron now. The Hall was literally dying with laughter.

"Now, stop fannying around and go!" Kalilina demanded. Harry and Ron started jogging their way through the school, catching the attention of everyone around them. It was about dinner time when Harry and Ron came back to the Great Hall. The teachers all gawked at the two boys.

"Mr. Weasley! Mr. Potter! Why are you running around with only your undergarment?" Professor McGonagall screeched.

"It was all Kalilina's fault, Professor! Not ours!" said Ron, pointing to the girl in question. Kalilina looked surprised.

"Miss Black?" Professor McGonagall said.

"I have no idea what they're talking about, Professor," said Kalilina, in a convincing surprised voice.

"She's lying!" shouted Harry.

"Why would I do something so vile and crude?" Kalilina shrilled, starting to break into tears. "I - I c-can't b-believe y-you w-would a-accuse m-me of s-something l-like that."

With that, she started wailing and flung herself onto the closest person at the time - George. He held her and shot Harry and Ron a disapproving look.

"That is very childish of you two," Professor McGonagall turned attention back on the boys in front of her. "Blaming Miss Black for something she had no participation in whatsoever!"

"But - Professor -"

"She's lying -"

"Detention! And 20 points from Gryffindor. Next time, you'll think twice before pulling another foolish act," Professor McGonagall re-appeared Harry and Ron's clothes and strode back to her place at the Head table.

Harry and Ron sat next to a smirking Kalilina.

"You're evil!" hissed Ron.

"You're the devil's twin!" added Harry.

Kalilina winked.

"Tell me something I don't know."

I forgot to put this for Kalilina's first year, so wah-la! This is technically only going to be a two-shot, seeing as I missed this and Kalilina's twelfth birthday. So, yeah!