I do not own Gravity Falls.

Prompt: Naughty

Those Little Naughty Moments

Dipper and Mabel had grown up knowing the tale of Santa Claus, and his Naughty and Nice lists were not exempted. They never caused much trouble when they were younger, save for Dipper's scientific exploits gone wrong and Mabel's enthusiasm for various activities. But they were human, and occasionally they were reminded that if they did not listen, if they did not behave, Santa would put them on his Naughty list, and that meant no presents.

They were teens now, and the threat of the Naughty list transformed into the threat of their presents being returned. They were good kids, but they were fourteen and they were twins, so fighting, bickering and antics inevitably and understandably occurred. With only a couple of days left until Christmas, there were only a couple of naughty moments Stan and Ford had to curb.

...

Dipper had unknowingly eaten Mabel's last couple of brownies, which she had been saving for her friends and when she confronted him he turned defensive. "I didn't know," he snapped at her. "You didn't leave a note or anything. The kitchen is like a bakery right now. How am I supposed to know what I can and can't eat?"

"I told you," insisted Mabel. "I told you to leave the brownies alone!"

Dipper shrugged. "I don't remember that. Just make some more."

Cheeks flushing red, Mabel responded by grabbing hold of a pillow from her bed and slamming it against Dipper's side. The two fell into a fierce pillow fight, and it only ceased when Dipper accidentally knocked a lamp off of the dresser. It shattered against the floor, glass scattering across the hardwood.

Alerted by the commotion, Stan arrived in the attic seconds later. He took in the scene and demanded, "What the heck are you two doing?"

"He ate my brownies!" exclaimed Mabel, pointing accusingly at her brother. "I told him I was saving them!"

"She didn't!" insisted Dipper.

Stan held up his hands to prevent further protests and they fell silent. "Look, she made the brownies, and the least you could do is make sure she's not savin' them for other people," he directed towards Dipper, who grew sheepish. "Yellin' at your brother isn't gonna make the brownies come back," he then spoke to Mabel. "You're old enough to work out your problems without wreckin' the place. Keep fightin' and I'm takin' your presents back."

Dipper glanced at his sister, suddenly guilty that he hadn't apologized immediately like he should have. "Sorry," he said sincerely. "I can help you make more brownies, if you want."

Mabel smiled at him. "Thanks. I'd like that."

"But first you runts are gonna put on some shoes, clean up this mess and give me money for a new lamp."

…

To anyone who referenced the stereotype that girls took forever in the shower, Mabel wanted to introduce them to her brother. He could spend up to a good forty minutes under the hot spray, methodically lathering and rinsing his brunette strands. She often managed to beat Dipper to the shower in the mornings when she was in a rush, but this was not one of those days.

"Dipper!" she called, rapping soundly on the wooden door. "Dipper, I need to get ready! I'm supposed to be meeting Candy and Grenda in a half hour!"

There was no answer. Whether he could not hear her over the water or was purposefully ignoring her, she did not know. Huffing out a frustrated breath, she turned on her heel and strode down to the main floor. The second-floor bathroom was the only one with a bath and shower, and an idea was brewing on how to coax her brother out.

She shrugged on a jacket and her boots before venturing outside. She made her way to the fuse box attached to the side of the Shack. She squinted at the worn out labels stuck beside each switch before locating the one she wanted and flicking it.

The electricity to the bathroom upstairs shut off, and Mabel could see through the window that it was now in complete darkness. She could hear Dipper shout out and she snickered. "Ha. That'll get him out of the shower."

A hand landed on her shoulder and she jumped, snapping her head around in surprise. Ford stared down at her, lips curled in a disapproving frown. "That was unnecessary, wouldn't you say?"

Mabel flushed, smiling nervously. "I'm saving you some money on your water bill."

"Dipper may take quite a bit of time in the shower, but so do you most days. I don't recall him using any tactics to force you out of the bathroom."

"But I have plans!" she protested. "I have to get ready!"

"Is there a reason why you can't have your shower tonight?"

Mabel hesitated, and then admitted, "No."

Ford reached over and flicked the switch back into place, lighting the second-floor bathroom once more. "I know you're frustrated, but you don't take it out on your brother. It doesn't end well. I should know."

"I'm sorry," whispered Mabel.

Ford ran his fingers through her hair, expression softening. "I know. It's natural for siblings to fight, but you shouldn't resort to underhanded tricks. It is Christmas, you know. Presents can mysteriously disappear."

Mabel tilted her head to the side, smiling innocently. "Christmas isn't about the presents. It's about family."

Hiding his amusement, he replied, "Smart-aleck. Go get ready before you're late."

…

Their threats were empty and they knew it, for they could never bring themselves to deny Dipper and Mabel presents on Christmas morning. Everyone was naughty to some degree. It was human nature. Dipper and Mabel were fantastic kids, and if there was ever anyone stupid enough to say otherwise…

Well, in that case, it would be Stan and Ford who ended up on the Naughty list.