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...
Completed
An Error's Doll by EroseWisp
#2
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...
A Killer Life by FewCafe
#3
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...
Prisoner...? (Bad Sanses x Human!Reader) by ShadowOfFandoms10
#4
Prisoner...? (Bad Sanses x Human!R...by ShadowOfFandoms
Y/N was a human from a brand new AU...which was practically nothing. They were eventually rescued by the Star Sanses...only to be taken prisoner by the Bad Sanses. What...
Stuck in Fgod (Error404!sans) by GlowingEye4
#5
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...
Our Dear Wolfy (Sanses AU X Werewolf!Female!Reader) by AqilahDaWinterWolf
#6
Our Dear Wolfy (Sanses AU X Werewo...by Creator of Sans Creations
I'm sorry for boys who really want to read this... But hey! You can imagine yourself in this story as a boy. ༶•┈┈⛧┈♛✧༺♥༻✧♛┈⛧┈┈•༶ You are a werewolf and end up in a weird...
A light in the darkness |Nightmare x reader| by NekkoetOnTheIntrnet
#7
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...
Ask and dare the multiverse by TheDragonOfBalance
#8
Ask and dare the multiverseby TheDragonOfBalance
Just as the title says. Ask and dare our kidnapped- I mean honored guests as they arrive in a white empty void. Each chapter will have someone new to join in the asks an...
As Gaster and pregnant? by KarmaAkabane425
#9
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'...
Reincarnated as a Voice by IHamTiredAndBored
#10
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...
Adopted by Monsters by CreateBella
#11
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...
My Two Masters (UF!Papyrus x Skeleton!Reader) by OreoDaSkeleton
#12
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...
A Burst of SuperNova by Nanachi8
#13
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...
As ready as I can be since I'm dust...wait hold the phone! Pregnant!?  by KarmaAkabane425
#14
As ready as I can be since I'm dus...by Karma Akabane
(You know how it goes, someone from our world Ends up dead and becomes dust sans..but somehow pregangt, different things, different personalities etc
Becoming dream from dreamtale  by KarmaAkabane425
#15
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...
Reborn as Classic Sans but different (rewrite) by SarahWingDing
#16
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?
Ⓓ Ⓤ Ⓓ Ⓔ {Yandere! Undertale! Various x Underfell! Reader} by jackradical
#17
Ⓓ Ⓤ Ⓓ Ⓔ {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...
Transported as lust sans...kinda? by KarmaAkabane425
#18
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
Naturetale : reborn as lavender  by KarmaAkabane425
#19
Naturetale : reborn as lavender by Karma Akabane
(As far as I know, no one has made a story about naturetale like this so..and the only reason why I writing one like this is because of fatal error part 5? Or part 4, go...
Bad Sans Poly Yaoi/lemons by Glitch3d711
#20
Bad Sans Poly Yaoi/lemonsby YaBoi
💜Includes💜 ------------------- -BDSM -Threesomes/Orgys -Tentacles -Knife play -Pain kinks -Degrading/Prase -Cross's existence -Error's existence