Underfell Stories

1.2K Stories

If Only You Knew by FellSans
If Only You Knewby Underfell Sans
//Trigger Warning!// This is about the struggling brotherly relationship the Fell brothers are having. It consists of triggering topics, so please don't read if it trigg...
You have become an Error (Discounted For Rewrite) by MikkiMausu
You have become an Error (Discount...by MikkiMausu
(Discounted for a rewrite) A shy girl dies in her reality saving a kid from a speeding car founds herself trap in the anti void as a being called Error Sans the god of d...
My Itty Bitties by ItsSwapPapyrus
My Itty Bittiesby Teutonic
A box has been left at your doorstep. thinking that someone must've given you the wrong mail, you take it inside and wait for someone to come by and claim it. When a wee...
An Oath of Mercy || UnderFell Sans x Reader by PricklyHedgie
An Oath of Mercy || UnderFell Sans...by SilverSnake
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...
Naturetale : reborn as lavender  by KarmaAkabane425
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...
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...
●~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...
You and Your Bitty Pals by Blueprint15778
You and Your Bitty Palsby Blueprint15778
It has been 10 years since the monster broke free from the barrier, and since then monsters and humans live together in peace. But for some reason, monsters have somehow...
Furtastic by Juniperlives43
Furtasticby Juniperlives43
A girl who has never seen the world outside of the lab sees it for the first time only to fall down into the underground. What will she find down there?
Castle's Pet (Bad Guys X Reader) by EmelinStriker
Castle's Pet (Bad Guys X Reader)by Emelin
[Highest Rank: #1 in "sans"] [Second Highest Rank: #18 in "xreader"] (Girls only!) (Earlier updates are on my Quotev account!) WARNING: Profanity a...
Gaster Gang x Reader OneShots by SansFans666
Gaster Gang x Reader OneShotsby Mason
(Edit September 4 2023: requests closed as of like six years ago sorry guys) Read to discover which events take place in the Void as (Y/n) journeys throughout life with...
The child nextdoor by Honey_Bee669
The child nextdoorby psycho teddy
trigger warnings will be placed at the beginning of each chapter! this story will contain mature content, be warned before reading.
It's a hot miracle {Up for adoption} by thatsmolbagle
It's a hot miracle {Up for adoptio...by Mangoz
Sans was dealing with nightmares and depression he never said a word about he always hid it with a smile, so he started cutting for a long time until, he met another ver...
I'll Give You My All, Until I Can't Give No More/ A Kustard Love Story by RandomP1256
I'll Give You My All, Until I Can'...by Alastor
As long as Classic can remember, he's always had feelings for Fell. He's not sure when these feelings started but he knows he would do anything for Fell. He swore to him...
Reborn as the tree of feelings by KarmaAkabane425
Reborn as the tree of feelingsby Karma Akabane
What if someone died and became the tree of feelings from dreamtale? Well things won't stay the same, that's for sure. (Different everything etc, different personalities...
Not Just Evil (Underfell Papyrus X Reader) by TheIndianaCrew
Not Just Evil (Underfell Papyrus X...by Indie
Underfell Papyrus is viewed as one of the most ruthless monsters in the underground but what is really under that tough persona? Thanks to Tamqul on Deviantart for letti...
The Reincarnated Trio by Dark-Snow_463
The Reincarnated Trioby Dark-Snow
Everybody knows the trio Sanses, the 3 first AUs of the Multiverse ░▒▓█ ℂ𝕝𝕒𝕤𝕤𝕚𝕔, 𝔽𝕒𝕝𝕝, 𝕒𝕟𝕕 𝕊𝕨𝕒𝕡 █▓▒░ and EVERYBODY knows about reincarnated in a San...
'Shy Pet' Underfell Sans X Reader by sentifrost
'Shy Pet' Underfell Sans X Readerby noé
[Disclaimer that this book is very old nd poorly written, please keep that in mind!] You were shy. You were small. You were picked on. You were told you weren't tall eno...
Frans pictures by Ruby_Cat1082006
Frans picturesby Zhira
I found this pictures on deviantart,pinterest,google and Frans Amino