Undertale and AUs
9 stories
An Oath of Mercy || UnderFell Sans x Reader by StrawberryMilkSnake
StrawberryMilkSnake
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One clumsy moment and a broken leg are all it takes to leave you at the mercy of the very edgy and very hostile monsters of the underground. Thanks to your knowledge as a doctor (and oath to do no harm), you're able to convince the Great and Terrible Papyrus to keep you alive. But how are you going to find your way back to the surface with a bum leg and a short skeleton that doesn't seem to like you? | - UnderFell Sans x Human Reader - Enemies to lovers but Fell is the only one hating - Your leg privileges are revoked, and Fell needs to wash his mouth with soap - Flowey is an equippable companion and decides to help you cuz he actually gets something out of it - My own interpretation of UnderFell (tho from what I've seen it doesn't really have a narrative anyway)
Forced Resets (Sans x Reader) by Determined_Reader
Determined_Reader
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    Parts 60
Your name is (Y/N), or seven as you call yourself, and you have tried all you can to stop these resets. Its not you nether is it Frisk. You don't know who it is. It is almost at the 100,000 mark and you can't help but notice some changes going on. And your not the one causing them... You may need some backup.
Your Odd Neighbor (Horror Sans x Reader) by OreoDaSkeleton
OreoDaSkeleton
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Y/N's best friend Blueberry (also known as Underswap Sans) invited them to move into the shared/connected apartment next door. They could hang out all the time! It's an awesome opportunity and the chances of it happening again are slim. Being closer to friends means a lot, especially in this tough life on the surface. Blue has introduced Y/N to other Sanses before, and they've never had any issues with them. Even so, what happens when they find out that Blueberry now has a very creepy one as a roommate? His cracked-open skull and unclear motives for being here are a major concern. Still, it's not as freaky as the stranger's ghostly appearances and obnoxious actions. Blue says "he's just misunderstood." Should Y/N follow their conscience, warn Blue and run? Or listen to Blueberry's optimistic advice, and befriend their new neighbor? Hello! owo ... Undertale aus and art presented in this book are not mine. However, the story is 100% my work! I hope you enjoy it!
Ursa Major (Sans X Reader) by Im_SANSational
Im_SANSational
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    Parts 24
It had been a couple months since your little sister went missing. Guess how surprised you were to see her on the news with the headline "Young Girl Helps Monsters Escape". When you meet the friends she made in the underground you can help but to love all of them, especially a skeleton with a love for puns and stars. Sorry I'm not that good at summaries X3 This is my first story so please tell me if I misspelled anything. I view frisk as a female so I apologize if you view them as male or both.
A Drop Of Paint; Ink x Reader  by lilwolf161
lilwolf161
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    Parts 52
Y/N is a girl who is running from her past. Her parents are gone, disappeared after an accident. No one helps her and she has no siblings. Her life has been a living nightmare. She gets bullied so much, she runs up to the top of Mt Ebott to cry her worries away. But she trips and falls down into the abyss of the underground... The monsters are still underground but they are nice to all humans who fall. Since Frisk is living down there with all of them. I don't own any of these pictures, unless I tell you. But I'm not that good as other people are, so you might not see my drawings.
My Little Mutt (FS!Papyrus x Female!Reader) by OreoDaSkeleton
OreoDaSkeleton
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    Parts 44
Hi guys! First of all I should mention that the story pic isn't mine and of course Fellswap belongs to its original creator. A young hiker, Y/N gets lost and accidentally falls into a pit while stumbling in the dark. She wakes up to find herself in a whole new world that was never spoken of before except in children's stories. That's when she stumbles upon Barb (aka Mutt) and makes her first friend in the underground! But other monsters that live here aren't so welcoming.
Finding Fresh Air - Swap! Papyrus x Reader (Rewrite in progress) by B_string_e
B_string_e
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!! Long Chapters !! 1000-4000 words each! **This book will be continued by another person so check the A/n at the end of the book to go to their continuation of this!** ---------------------- Y/n is a wonderful person, she's kind, calm, a bit lazy, and loves comfy clothes! Although she's a wonderful person, she gets caught up in the wrong crowd. This was starting to break her, until her favorite little girl, Chara introduced her to the skeleton brothers, Papyrus and sans. Sans always had a way to bring a smile to y/n's face, and Papyrus was always there for her, had the best advice, and his stupid puns that he called 'humerus'. After some unfortunate events with your 'most trusted' people you knew, Papyrus knew just how to help, but what happens if feelings get caught up in the middle of all of this?
Tall Tales - An Ink Sans x Reader Story by PotatoTheChip
PotatoTheChip
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    Parts 26
Orphaned. Left alone, the definition of it. Like a fantasy, or a dream, saved by a being willing enough to take you under their wing and keep you safe. With secrets to be shared, stories to be told, the months pass by as you trade your lives. Given warmth, Given care, Given love. But so insignificant is your life compared to what lies beyond, what is going outside of the safety and comfort of what you thought to be a normal life. What tall tales lie underneath the happiness you found. ((I wrote this when I was twelve, please stop readInG IT-))
(Sans x Reader) When Two Souls Meet by ZanaBSparrows
ZanaBSparrows
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Sans has lived through countless timelines. He's seen the kid make friends with everyone, only to give up in the final moments. He's seen the kid killed, over and over and over again. Sometimes, he'd even done the killing himself. And no one ever remembers. Not even the kid herself. It's an exhausting cycle, one that never seems to end. But there's something different about this run. Another human's fallen down... the kid's sister. Please note the the story is primarily on Quotev, so updates to Wattpad may be late, or lag behind that of Quotev. The story also has the potential to become mature. (I haven't decided yet.)