A/N: Yeah, another sick-fic from me (original, I know...) Anyway, enjoy! xoxo

Chapter One - A Chill down your Spine?

Sans opene his eye sockets and was surprisingly greeted by the morning sun gleaming in through his bedroom window. It was really strange, Papyrus usually woke him up before sunrise so as to get an early start on human-hunting patrols.
Not thinking much of it, Sans rolled out of bed, a pile of dirty clothes gently cushioning his fall. He grabbed a clean shirt, a pair of clean shorts and his already-worn blue hoodie and put them on.
Once he was dressed, he glanced over to his digital alarm clock, which was sat next to a couple of empty ketchup bottles and he couldn't believe it, it was 10:30 in the morning!

"That's weird..." he said quietly to himself
Papyrus hadn't woke him up. Not only that, but they had missed work by 2 hours. Sans cringed as he thought of how annoyed Undyne probably was. He made his way out of his room and down the hallway to his younger brother's room.

"Hey, Pap?" he called as he tapped on the door. "Don't freak but we're late for work."

No answer.

"Papyrus?" he called again, slightly startled by the silence

"I'm getting dressed, Sans!" Papyrus called from behind his door.

"Well, c'mon..." Sans sighed "Undyne's already gonna kill us both for being late!"

Papyrus didn't answer, he simply replied with a muffled growl.
Sans thought this was strange for his brother. He was usually a hyper ball of energy but this morning he seemed off. Truth be told, he was starting to get a little worried.

"Hey bro, you okay?" he asked through the wooden door "This isn't like you."

"I'm fine, Sans!" Papyrus replied "You just go get breakfast, i'll be down soon!"

"Okay...I'll be downstairs then..."

Just as Sans turned to go down the stairs, he heard an almighty thud coming from Papyrus' room. Without a second thought, he turned and ran straight back to his brother's door.

"Papyrus?!" he called as he forced the door open "Papy, you okay?!"

Once the door was forced open, Sans found his brother laying on the floor, still in his pyjamas shivvering in a pitiful heap on the floor beside his race car bed. Sans rushed to his side,

"Hey, hey hey, you alright buddy?" he fretted as he helped his younger brother sit up.

"Ow...my head..." groaned Papyrus as he leaned his entire weight into his brother's shoulder.

"C'mon, back to bed." Said Sans as he helped Papyrus back onto his bed.

The younger skeleton felt absolutly awful. He felt cold and hot all at the same time, and the funny, dizzy feeling in his skull had been there since the night before.
Sans reached for the blanket and wrapped it around the taller skeleton who was now shivvering so much his bones could be heard rattling against each other.

"Heh, what's wrong?" smiled Sans "You gettin' a chill down your spine?"

"Haha...that one was pretty good..." Papyrus smiled weakly as he shuffled his way into a laying position, his blanket now wrapped around him like a big burrito.

"Wow." sighed Sans as he placed his hand against Papyrus' forehead "You must be sick if you laughed at one of my jokes."

"I am NOT sick!" Papyrus declared as he attempted to sit up. "THE GREAT PAPYRUS NEVER GETS SICK!"

Suddenly, the room began to spin, and Papyrus felt himself falling back into his pillow.

"Okay..." he groaned painfully "I think I am sick..."

Sans simply smiled and tucked his brother into bed, making sure to cover every inch of him in order to keep him toastie and warm. Suddenly, Papyrus gripped his middle in pain, letting out a small but agonising whimper which made Sans lurch forward to grasp his brother's hand.

"Woah, Pap!" he gasped as he felt Papyrus squeeze his hand "You in pain?"

"My stomache..."

"Pap, we don't have stomaches, we're skeletons." Sans replied in confusion.

"Okay, smarty-bones..." Papyrus groaned "Whatever we have, its really hurting!"

Sans could see the strain in his brother's face. Skeletons or not something was hurting him, internally. Papyrus, still gripping onto his older brother's hand, began to toss and turn in the bed, crying out painfully.

"Sans!" he cried "Oh, god Sans! It's burning!"

Sans was begginning to panic. Something was seriously wrong with his brother, but what could he do? Papyrus sat up in the bed and began to rock back and forth, still crying out in pain as his brother watched helplessly.

"Okay, okay buddy look at me!" Said Sans as he gently cupped Papyrus' face in his hands, forcing him to look straight at him, "I'm here okay? You're gonna be okay, Pap!"

Without warning, Papyrus let out an agonising scream as he fell backwards onto the bed, still gripping where his stomache should be.

"It's-it's moving to my chest!" he cried as he began to claw at his ribcage "Sans, I think I'm dying!"

"Stay here!" ordered Sans. "I'm gonna call Alphys!".

He rushed out of the room and down the stairs, his brother's screams still echoing through the house. Hopefully, Alphys could give him some answers.