Author's note: Read at your own risk.
It was the middle of the night in Gravity Falls. The Pine twins were sound asleep, well almost. Mabel kept hearing stuff coming from the closet. Every sound she heard, she jumped. So she did a smart thing and went and nudged Dipper's shoulder until he woke up.
"Dipper?" She whispered, quietly at her brother. Dipper finally woke up. "Mabel? Ugh, What time is it?" He asked. "Dipper can... can I sleep with you tonight," Mabel asked. "There's something moving in the closet and it's freaking me out."
Dipper scooted over and made room for his sister. Mabel hopped in with her brother. But little did Dipper know, Mabel sleep eats when she's sleeping.
Mabel turned and turned and turned, which annoyed Dipper. But he didn't want to wake Mabel up. Just then Mabel's teeth started chomping on a pillow. She started trying to eat that pillow like a piece of meat. Then she turned to Dipper. "Diiiiiiipppeerrrr." She moaned. Mabel was sleeptalking. "Diiiiiiiiipppppeeerrr." She moaned again.
Dipper turned to his sibling. "What?" He said. Just then Mabel's braced teeth bit her brother's finger off. The blood started rushing from his amputated finger. "WAHHHHHHH!" He yelled. Mabel then awoken. "Huh, what's going on?" Mabel asked, with droopy, innocent eyes. She then saw Dipper's finger on her pajamas. "AHHHHHHHHHHH!" She yelled. Dipper explained to her that she was sleep eating. "WHAT!?" She yelled.
Mabel starting worrying and worrying. Dipper calmed her down and checked in his number 3 book for sleep eating. "Hmm," He said. "It says here that sleep eating is caused by the not eating in the past 12 hours. Mabel did you eat anything in the last 12 hours?"
Mabel thought for a while. "I ate some glitter, and some candy. She my stomach is officially bedazzled." She said. Dipper face palmed. Then he went downstairs and got Mabel an early breakfast, cereal and milk. Mabel digested the food then the twins went back to bed. Mabel still turned and turned. Then she grabbed Dipper's crotch, by accident. Dipper felt a sensation down in his shorts. "Mmm, Wendy." He moaned. Mabel then bit his brother's crotch off. Dipper started bleeding and he barely even noticed. Mabel then bit off Dipper's tiny legs, Dipper then noticed that.
"YEEEOWWW!" He yelled. "Oh no, she's sleep eating again." Dipper started nudging Mabel's arm. But she didn't budge. Mabel started sucking of Dipper's bones, then crunched them off with her braced teeth. She showed no mercy. She then started licking Dipper's torso, then bit off his stomach. "Diiiiiiiipppppeeeerrr." She moaned. "Yoouu, taste aammmaaaziing."
She kept licking off the blood from the biten areas. Dipper tried waking Mabel up some more but he failed each time. She then ripped Dipper's heart out with her braced, now bloody, teeth. She digested the organ whole. She then bit off some of Dipper's facials off. The she pushed the body under the bed.
"Now I have the bed all to myself." She smiled, still sleeping.