Upside-down

Undertale (Video Game)
F/F
F/M
M/M
G
Upside-down
Summary
Frisk is a monster that lives on the surface, however she always heard about the humans trapped underground after they stole their ability to use magic in the Great War...however Frisk is curious. As she was climbing up Mt. Ebbot trying to pick some stuff as usual, she finds herself falling deeper and deeper in the deapths of a new beautiful world.Will Frisk leave the humans down there or will she sacrafice her monster soul to help them?
All Chapters

Chapter 36

"w-what the...?" Sans muttered as he opened his eyes. Suddenly, the forgot everything as he noticed the view of the city. 

"You know? You're not as light as you may think!" Frisk said through her teeth as she flapped her wings. Sans' eyes widened. 

"FRISK! SHIT- CAN YOU USE YOUR WINGS?!" He said, worriedly, remembering her wound. She chuckled. 

"If we're flying? I think the answer is obviously yes." She said, grunting a bit after as they glided in the air. 

"b-but how...??" She giggled. 

"Strong emotions...remember?" Sans face-palmed. 

"god damn it, i'm an idiot." She shrugged. 

"Wanna see something cool??" She asked, smirking. He raised a brow. 

"what?" She pointed her finger at the claw. 

"Boom~" The whole thing exploded, sending the men who kidnapped her flying around like dominos. Sans' eyes widened as he whistled lowly. 

"i'm never angering you in my life..." She giggled. However, on the ground, Sans' and Frisk's family and friends were panicking thanks to the explosion. 

"SANS! NO!" Papyrus yelled, trying to go through the wall of police officers. 

"No! You cannot go after them!" Papyrus looked at the police men with a lost look. Chara and Asriel stepped forward. 

"We need to go see if Frisk and Sans are alright! Let us through you bastards!!" Chara yelled. Toriel covered her mouth and sobbed. 

"My child..." She said. Asgore put a hand around his wife. Undyne snarled. 

"WHAT THE HELL?! DON'T KEEP US AWAY FROM OUR OWN FRIENDS! WHAT TYPE OF OFFICERS ARE YOU?!" The police officers didn't even budge. 

"We are concerned for your safety. A team has been sent to check the rubble already. 

"Oh, please let us help! W-We have magic!" Asriel said, pleadingly. The officers shook their heads. Alphys stepped forward. 

"M-maybe I-i can d-do something! I-I'm a scientist and--" 

"Nobody is allowed on the crime-scene." Everyone looked at each other in disbelief. 

"D-Darlings...let's not get ahead of ourselves. I am sure these two are fine...right...?" Part of the claw broke right before their eyes, falling with a loud rumble. Papyrus fell on his knees. 

"I'M NEVER GOING TO SEE MY BROTHER..." Gaster, who had been silent, let his head hang down. 

"I failed...both of them..." Frisk and Sans landed a bit further behind the police officers and looked at each other. 

"i think you may have only failed her..." Sans said, pointing at Frisk. She shook her wings and a few feathers fell as she stretched. Everyone looked up in surprise. 

"BROTHER!" Papyrus said, pushing through the officers and picking Sans up, twirling him around. Frisk smiled as she backed away to let the humans hug each other. She shoved her hands in her pockets and watched, smiling. The two monster police officers looked at Frisk and came to offer her some help with her wounds but she refused. Gaster then got away from the small cheering and laughing group. 

"Frisk...??" He asked, softly. She looked up and smiled. 

"Hey 'Doctor'" She said, chuckling. Gaster looked at her with a soft smile. 

"Let's get you patched up, Frisk..." For a second she saw herself back at the orphanage, taking her friend's hand. 

"Lead the way..." She said, nostalgically. Gaster sat her down on some barrel and started using his magic. Frisk's tail was slowly wagging as she watched him work. 

"You've done an excellent job, Frisk..." Frisk smiled. 

"I know....HE told me..." Gaster's eyes widened then he snorted. 

"I am sure he's proud of you, Frisk...We all are..." She stiffened as she heard those words...We...a home....a family...people who cared for her...Friends and family...

"Yeah...I know..." She said, smiling. They both looked as they heard a loud honking and saw Cherry, Ralph and Ralph's boyfriend who drove the car, Gregory. 

"FRISK! WE CAME AS SOON AS WE HEARD FROM THE TEACHERS!" Cherry yelled as all of them made their way towards Frisk. Sans looked at the group and smirked, teleporting next to them. 

"how's your wounds, sweetheart?" He asked, popping up next to his father. Frisk looked up and smiled, letting her wings stretch and giving him a bright smile. Sans blushed a bit and smiled as well. 

"glad to see..." And then everyone gathered around Frisk, praising her and fussing over her getting hurt. She, however, has never felt better. 


The men who didn't end up in the hospital had been taken into custody and then, after a trial, they had been sentenced to prison and all of their 'subjects' freed. However...they let Frisk have a bit of fun after the trial when they were taking the man that raped her away. They were walking away when it happened. 

"You little bitch...you ruined everything." She stopped dead in her tracks, Sans stopping by her side. 

"Oh honey...YOU ruined yourself" She said. The man snarled at her. 

"NO ONE WILL EVER LOVE YOU, YOU FILTHY RAT--" She didn't even wait as she twirled around and used her foot to shut him up for good. 

"Do us all a favor? And shut up." She said, her eyes flaming red. Sans flushed as he watched her and the police officer handling the guy laughed. 

"Good one, ma'am. Have a great day." The officer said as he shoved the man in the car, his mouth bleeding. 

"wow..." Sans said, with wide eyes. Frisk giggled. 

"You've seen nothing yet~" She said as she walked away. Chara whistled. 

"Now THAT is some good flirting." Chara said. Asriel watched her go and blinked in surprise. Chara saw him stare and smacked him. 

"Don't stare you idiot!" 


Life had been going great for another week until the police officers announced Frisk of a finding in those people's lab. A container with a determination soul that was actually...

"Louis..." She breathed out as she saw the soul. She stared with wide eyes as the soul twirled. They never killed her brother. They somehow managed to get rid of his physical form, which meant...if they experimented on him...setting him free would give him a body again. She raised the container and shattered it. Everyone stared with wide eyes. 

"FRISK, ARE YOU MAD?! YOU JUST FREED A SOUL--" Gaster said, but the soul started forming a body around it. The hair, the wings, the tail, the horns...Louis. It was a grown up version of Louis. Frisk watched, her eyes filling with tears. 

"Louis..." The guy looked at her with wide eyes then at himself. It didn't matter he was naked...He was alive. 

"Frisky...Oh, baby sis..." She ran and hugged him as tightly as she could and started crying. 

"Shhh....I'm right here, Frisk...Nothing is going to hurt me now..." Everyone stared smiling at the sweet scene. But then Chara looked down. 

"Holy shit- shotgun-" Asriel covered her mouth. 

"Nope. You're not talking about his shlong when they're having a reunion you pervert." 

"Oops..." 


And life goes on. Louis got a job as Gaster's apprentice as well and everything is back to normal. Frisk and Sans are still together even if Frisk loves to make fun of Sans 'romantic' death moment. And so the group of humans and one monster graduate. Each one of them getting jobs, Frisk becoming ambassador and they live happily. Frisk and Sans live with two kids now. Louis was more than happy to be an uncle. 

"Can you STOP hissing at your brother, Elys??" Frisk asked, frowning. The little girl rolled her eyes and scratched her fluffy ear. 

"Nahh...i like scaring him~" The little boy frowned with his eyes squinted like his mother's. 

"You're mean!" 

"arno, don't insult your sister." Sans said, chuckling, from the door-way. The two kids jumped up. 

"DAD!" They both teleported downstairs from the top of the stairs where they were. Frisk rolled her eyes and jumped over the railing, gliding down. 

"Hi, sweetie." Frisk said, chuckling. Sans smiled and hugged her, giving her a kiss. 

"Ew." Elys said. Arno made goo-goo eyes. 

"It's cute~" 

"Yeahhhh no. Dad! Tell us the story of mom and the Underground again!" Frisk and Sans both raised their brows. 

"Again?" Frisk asked. Sans chuckled. 

"alright, just get ready for bed before it." The kids jumped up and started racing up the stairs. 

"They sure love that story..." Sans laughed. 

"you're just THAT awesome." Frisk snorted and elbowed him. 

"Shut up." 

Yeah...they lived happily...

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