Undertaleaus Stories

1.2K Stories

Our Pen by R3myR3ad3r
#1
Our Penby R3myR3ad3r
You're the Ink of your multiverse, and you don't even know it. Well, until you meet the Ink of another, along with Error. -NOTES- I made the cover! This obviously isn't...
A Killer Life by FewCafe
#2
A Killer Lifeby nok_nok
adopted story. original by @Mijunaa :3 - The afterlife of a dead human that reincarnated into a Killer!Sans variant. The facade of the new owner of the body, could he k...
A light in the darkness |Nightmare x reader| by NekkoetOnTheIntrnet
#3
A light in the darkness |Nightmare...by NekkoetOnTheIntrnet
Everyone craves the light. It's what keeps them going. people will do anything they can to keep their light shining, but what will they do if the light extinguish and wh...
Reborn as my Sans OC from Undermonster by MiscodeSans
#4
Reborn as my Sans OC from Undermon...by MiscodeSans
Miscode and his friends adventures.
Adopted by Monsters by CreateBella
#5
Adopted by Monstersby Create Bella
Hello, this is an au where the bad sanses adopt a kid which would be you ^^ only brotherly and fatherly love ^^ please enjoy this! This book was inspired by a book I rea...
Stuck in Fgod (Error404!sans) by GlowingEye4
#6
Stuck in Fgod (Error404!sans)by GlowingEye4
Error404 is having a wonderful day in his multiverse! Error is actually keeping his criteria, Alphatale is going along well, Bill!sans is nowhere to be seen, and that DA...
AU Sans X Reader One-shots by Little_Blue805
#7
AU Sans X Reader One-shotsby Blue
Completely female readers unless a request asks different. That's...really about it, enjoy!
Becoming dream from dreamtale  by KarmaAkabane425
#8
Becoming dream from dreamtale by Karma Akabane
What if someone from our world became dream on the first day they were made and were determined to not lose their brother to corruption like the original dream did in th...
Becoming Error, The Forced God Of Destruction by PinkieKidoCup
#9
Becoming Error, The Forced God Of...by PinkieKido Cup
What if someone is reborn as Error? What if they aren't so bad? What if they're suffering in silence and keeping their job a secret for fear of hate? How will Ink react...
Ⓓ Ⓤ Ⓓ Ⓔ {Yandere! Undertale! Various x Underfell! Reader} by jackradical
#10
Ⓓ Ⓤ Ⓓ Ⓔ {Yandere! Undertale! Vario...by one radical man
{Yan! Ut! Various x Fell! Reader} [reader is Gender Neutral] [College! AU] [tw: yandere themes, obsessive and posessive mindsets. read at your own risk. i do not condone...
As Gaster and pregnant? by KarmaAkabane425
#11
As Gaster and pregnant?by Karma Akabane
Small warning if you don't like the ship Gaster x grillby don't read Also no sex scenes or anything sooo yeah Also might be one of those ones that I work on when I can'...
An Error's Doll by EroseWisp
#12
An Error's Dollby EroseWisp
You didn't have a bucket list or anything, but you wished you could've at least read a few more fanfics or done literally anything fun before dying. Oh well, at least yo...
+21 more
Reborn as Classic Sans but different (rewrite) by SarahWingDing
#13
Reborn as Classic Sans but differe...by Sarah WingDing
A 31 year old female died and reincarnated as Classic Sans. The multiverse is fighting.Will she join the fight does she know the truth?
Bad Sans Poly Yaoi/lemons by Glitch3d711
#14
Bad Sans Poly Yaoi/lemonsby YaBoi
💜Includes💜 ------------------- -BDSM -Threesomes/Orgys -Tentacles -Knife play -Pain kinks -Degrading/Prase -Cross's existence -Error's existence
My Two Masters (UF!Papyrus x Skeleton!Reader) by OreoDaSkeleton
#15
My Two Masters (UF!Papyrus x Skele...by ~Oreo~
Y/N's been traded and sold her entire life. She's learned firsthand that if you don't obey your master, you get hurt. If you force yourself to listen, you live another d...
Reincarnated as a Voice by IHamTiredAndBored
#16
Reincarnated as a Voiceby TiredAndBored
TW: Swearing and slight gore Y/N reincarnates in the anti-void as a Voice... Will he befriend error or will they make them hate their guts? And will they meet other peop...
Sanscest Pics~ by OnlyAiko
#17
Sanscest Pics~by Aiko but Stupid
Okay I'm only doing my Favourite ships so I won't be any taking requests. I stand my ground and would like it To stay that Way for as long as I stay on this App. ⚠️ALSO...
Becoming a creator from undertale aus by KarmaAkabane425
#18
Becoming a creator from undertale...by Karma Akabane
What if..someone from our world died and became a creator that was everywhere and nowhere at the same time? What if that someone..became dust sans friend before he joine...
A Burst of SuperNova by Nanachi8
#19
A Burst of SuperNovaby Nanachi
A change can lead to a new outcome, some worse than others or better than expected. When one's curiosity leads to a new life, do you accept the change or destroy it fro...
Transported as lust sans...kinda? by KarmaAkabane425
#20
Transported as lust sans...kinda?by Karma Akabane
What if..someone was transported as lust sans.. and also weren't them at the same time? (Different happening..different beginnings...etc