✔ Undertale, Christmas Party x OC

Chapter 1

" 'Sup, Geno!"  Mikaela greeted the Aftertale Skeleman.  He smiled...or at least, it widened.

"Hey, Mikaela.  Welcome to the party.  Nice sweater."  He greeted and complimented.

"Thanks, Geno!  I like yours too!"  She gave him a closed-eye smile.  He returned it with great joy.  She and the original Sans and Papyrus were the first ones to the party.  Geno was one of the few who knew which AU she'd come from.  He wondered how the others would react to such a sweet thing like her, coming from a weird-ass AU like that.
"Geno, you still with me?"  She waved her hand in front of his face.  He snapped out of his thoughts and grinned lazily.

"Yeah, I was just thinking about how the others would react to your AU when they find out."  He chuckled at the thought.

"Well, this is the first time some of them are realizing they're from different AUs and Timelines.  I think they'll be confused at first.  So I'll wait for my Sans and Papyrus to join us."  She grinned.

"Oh?  They're coming?"  He questioned a little worriedly.  He's met them and knows what they can be like.

"Not until later.  They said they would only come because I'm going and they want to make sure I'm okay.  Y'know, the usual overprotective stuff."  She shrugged in reply.  "Anyway, I'm gonna go say hi to the Originals too!"  She became giddy.  Geno smiled at the human's excited spirit.  But he's seen how she can really be as well.

"Tell them I said 'hi'."  He nodded.

"Will do!"  She reassured him before racing to the kitchen where the two would definitely be hanging out.

"SANS NO!  THE KETCHUP ONLY GOES ON THE SPAGHETTI AFTER IT HAS BEEN COOKED."  Papyrus screeched quite loudly.  She turned the corner to look into the kitchen and saw two skelemans, tall and short, in festive sweaters.  The shorter one (she assumed was Sans) held a bottle of ketchup, and the taller one (she assumed was Papyrus) was stirring a pot of spaghetti.

"Are you sure it doesn't go into the pot as it cooks, bro?"  He lazily grinned.

"YES I AM SURE!"  Papyrus "ree'ed" back.

"Okay, if you're sure."  Sans chuckled.  Both suddenly noticed the raven-haired girl watching them with an amused look from the doorway.  They waved uncertainly, so she approached.

"Hi!  I'm Mikaela!  Geno invited me and my AU Sans and Papyrus over!  But they had things to do, so they won't be here for a while!"  She greeted, with an outstretched hand.  Sans shook it and there was a farting sound.  She giggled at this prank.

"Hahah!  The old whoope-cushion in a hand trick.  Always works."  He laughed, taking it off.  Papyrus, however, flipped a damn table.

"SANS!  THAT IS NO PROPER WAY TO GREET SOMEONE YOU JUST MET!  ESPECIALLY A NICE HUMAN GIRL!"  Papyrus reprimanded the shorter, but older, skeleman.  He just chuckled.

"Sorry, bro; it was tuna good an opportunity to miss."  He winked.  Mikaela giggled.  Papyrus was triggered beyond even the void Gaster was thrown into.

"BROTHER, NO!  NO PUNS IN THE KITCHEN!"  Papyrus scree'ed.  Sans and Mikaela just burst into laughter at his reaction though.

"Sorry bro, I had to."  Sans laughed.

"NO YOU DID NOT!"

"What did I just enter into?"  Another Sans stood beside Mikaela.

"Hello!  I was just watching these two skele-brothers getting along in the kitchen!  I'm Mikaela by the way!"  She greeted.  Slightly awkwardly because her world doesn't allow for the best of communication between monsters, humans and other monsters.