Underfellsans Stories

245 Stories

●~My Prisoner~● [UF!Papyrus x Fem!Reader] by xxAstrixZxx
●~My Prisoner~● [UF!Papyrus x Fem...by xxAstrixZxx
[Completed] [[Lemon and Swear Warning]] [2019 Jan Note: This book dates back to 2017, where my grammar and spelling checks weren't efficient due to me being lazy. So I a...
Six Skeletons, One Maid by RaccoonSinQueen
Six Skeletons, One Maidby RaccoonSinQueen
Moved from AO3 because of reasons! "You are the only maid (or worker in general) that serves for the Skeletal Household. It's a skele-ton of work, but you manage by...
A Bad Fuckin Temper (Underfell Sans X Female Reader) by halloweenmurders
A Bad Fuckin Temper (Underfell San...by Halloweenmurderers
You're 17,Your name is Y/N,You got a bad temper.You we're walking home,after a shitty day of school,you then heard a group of kids laughing. "The fuck is it now wit...
'Shy Pet' Underfell Sans X Reader by VeteranTucker
'Shy Pet' Underfell Sans X Readerby ° Burden °
You were shy. You were small. You were picked on. You were told you weren't tall enough. You were hurt. Physically and mentally. He wanted a pet. He wanted someone who w...
Sinners- Underfell! Human!Sans x reader [COMPLETED] by deadsoulsm
Sinners- Underfell! Human!Sans x r...by 🖤𝕯𝖆𝖇𝖎 🖤
Your foster brother, Frisk ran away to the underground, leaving you alone until they came back with some new friends. Another race of human called "monsters" w...
Can I take you to Dinner? Mafi-fell!Sans x Reader.  [COMPLETED] by MissHoll-E-Socks
Can I take you to Dinner? Mafi-fel...by MissHoll-E-Socks
"How rude, not even gonna ask for a name??" He teased. "Why are you here?" You glowered, raising the whisk. The skeleton scoffed: "Well, glad yo...
Flower you today, sweetheart? (Flowerfell Sans X Reader) by TheAbandonedQuiche
Flower you today, sweetheart? (Flo...by TheAbandonedQuiche
All the world, just hated kind people... they threated them as nothing and put them aside. That even happened in the underworld... They saw them as a sickness, what they...
Undertale One-Shots by Infernapefan2020
Undertale One-Shotsby Jessie
Also available on Quotev, (https://www.quotev.com/story/7318911/Undertale-One-Shots) on All of them (if not, most) are Reader X (Undertale Character/AU Character)
Underfell Sans X Frisk by Hazefrost
Underfell Sans X Friskby Hazefrost
When Frisk falls into the Underground, she is horrified to discover the world of monsters is every bit as evil and broken as she had been told her entire life. But when...
Trust Issues (Kustard) by hunrhimoogle
Trust Issues (Kustard)by Your_Average_Huney
One deal. One friendship. One choice. Follow Fell and Sans in a high school romance, where together they grow up, change, and fall in love. All Undertale aus, and Unde...
Life in a forest ( Au sanses x reader x au papyruses ) by Tr33Hollows
Life in a forest ( Au sanses x rea...by G-racie
An au sanses x MONSTER reader x au papyruses? Papyri? A fanfiction, it is not self-indulgent. So if your just lookin for some fanfiction to put yourself in, here it is...
I love you a skeleTON ( sans x chubby reader) (discontinued! Sorry!) by SierraColor
I love you a skeleTON ( sans x chu...by Sierra Color
Mainly what the title says. Lots of Sans, ton of SANS, Undertale sans, undefell sans, ALL THE SANS. BUT WITH A CHUBBY READER. WHHHAAAAT I KNOOOOW. READ FOR THE FLUFF...
The Sans Party! [ENDED] by DinoDren
The Sans Party! [ENDED]by Shindou
HIGHEST RANK: #41 in Random juѕt чσur dαílч hαppєníngѕ wíth ѕαnѕ αnd híѕ díffєrєnt "hím(ѕ)"! (this book is full of Sanscest, trust me) EVENT: [n/a] Book C...
Lost In Limbo - A Sanscest Story by michadraws
Lost In Limbo - A Sanscest Storyby micha.draws
Everything comes from somewhere, nothing changes overnight, just like nothing is for free, the answers don't just come to you, every voice belongs to someone, and maybe...
Underfell Sans X Reader: A New Beginning by Bearab00
Underfell Sans X Reader: A New Beg...by Bearab00
(Y/n) was a cheerful young girl once. Her life couldn't have been better, that is until that fateful day. With the loss of her mother and becoming a victim of sex traff...
Christmas Party Au Comics (traduccion) by AnonimaVienKhul
Christmas Party Au Comics (traducc...by AnonimaVienKhul
Haré la traducción de esta serie de cómics que me gustaron bastante de los mundos alternos de sans y papyrus(y Gaster) en una fiesta de navidad xD Disfruten! (?)
You Only Pick One! (AU Sans and Papyrus x Reader) by Something-in-nothing
You Only Pick One! (AU Sans and Pa...by Something-in-nothing
College sucks and so does work, but hey! At least your neighbors are pretty interesting. Skeleton monsters with crazy personalities who are all in love with you? Sounds...
Underfell Papyrus x reader- All hail the king (Completed)  by Kath1908
Underfell Papyrus x reader- All ha...by Kath Wortman
A young human runs out of the ruins desperate to get to safety. She runs into the Skeleton brothers Sans and Papyrus. Before she can know what's happening her world is c...
True Reflections by OliveMint
True Reflectionsby OliveMint
Cover isn't mine. This is my AU, and my story. If you don't like it, feel free to ignore/leave. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ It was a normal day in Underfell. Mo...