Underfell Stories

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1.2K Stories

  • Marked in Red, Claimed in Gold (Mafiafell Sans x Reader) by clubofsnakes
    clubofsnakes
    • WpView
      Reads 1,632
    • WpPart
      Parts 23
    The skeleton shakes his head slightly, a boney hand sliding across his skull. "Ah- well- that wasn't free Doll, 'course you'll have to pay me for that..." He trails off, his cocky smirk ever present on his face as he looks you up and down for a mere second, "...little favor." He pinches his pointer finger and thumb together before rubbing them together. _____________________________________ (Y/N) is a bartender that was kept secret from the after hours patrons at the bar she worked at for two years. Her boss not wanting her to associate with the people that would further pull her into a world that she was scratching the surface of just by working there. But after staying just a few minutes later then she was supposed to she stands face to face with a gold toothed smartass with a devilish smirk- his red eyes trained on her every move. ______________________________________ There is cussing but let's be honest- there's cussing everywhere. Also posted on AO3 as clubofsnakes where additional chapters later on will appear there and not here. I was inspired by- @MissHoll-E-Socks with their story "Can I take you to dinner?" NONE of the art is mine.
  • [°Undertale AU's x Reader°] |•one shots•|slow updates!] by Myste-Rey
    Myste-Rey
    • WpView
      Reads 7,531
    • WpPart
      Parts 41
    The sanses glared at the new entity at their world in fear but overtime their fears have lessened and started to adopt the new entity as their own. Afraid, of the faith might brought on to them they just braced for the best. This fanfic is made around 2022-23 so don't expect good things especially at the first few chapters of this book! (Also my English isn't my first language so bare with me! Thank you!) <[Requests are always open! I suggest you request at introduction page to avoid confusion!]> !!most definitely the cover isn't mine!! !!Non of the arts,video,AU are mine unless I told you it was mine!! !!credits to the au creators, and Toby fox for creating Undertale!! -Myste-Rey/author (Now Rein!) [!! the story will be updating slowly (very slowly) !!]
  • Reflections. Fell! Sans x Y/N by de4dd0ll
    de4dd0ll
    • WpView
      Reads 9
    • WpPart
      Parts 2
    "Even distance itself cannot end reflection." Y/N finds an antique mirror in the middle a junk pile at a local garage sale. Sans finds one in an old antique store. Neither expected to find someone staring back at them.
  • Red Mask by SpiritWolfNura
    SpiritWolfNura
    • WpView
      Reads 273
    • WpPart
      Parts 9
    Underfell is a dark and dangerous place filled with murder in violence, and Sans and Papyrus are the pinochle of it all. So nobody would ever suspect Sans to come back after a lost bet. Maybe you haven't seen all of what's under Red's mask, huh? Request for Icecream_Shipper
  • Guns Bleed Smoke (Mafiatale Papyrus x Reader) by clubofsnakes
    clubofsnakes
    • WpView
      Reads 123
    • WpPart
      Parts 10
    Working at a luxury hotel has its advantages- the pay, discounts, seeing celebrities. It's not all sunshine and rainbows, but you enjoy it! As someone who overanalyzes things and processes things different then most normal people, you find the mind numbness of the job very relaxing. Not too exciting, not too boring, just nice and simple. Unfortunately, you're really good at your job. And that causes you to accidentally overhear some intel- causing you to be kidnapped and sold at auction. What happens when a perfectly composed and professional monster loses his rational thinking in her presence? What happens when they come together to stop forces beyond their control- beyond their power? _________ Art doesn't belong to me.
  • If Only You Knew by FellSans
    FellSans
    • WpView
      Reads 7,402
    • WpPart
      Parts 10
    //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 triggers you in any way. Anyways- You don't have to read this lmao it's boring I know.
  • Control. Slash. Delete.  by Inkygalaxycat
    Inkygalaxycat
    • WpView
      Reads 5,937
    • WpPart
      Parts 10
    A.U.s have suddenly started to disappear, even ones as popular as HorrorTale and UnderSwap. The only ones unaffected are all who live outside of A.U.s in the Anti Void and the Creators and the Destroyers, but even here there is an issue. Nightmare Sans has disappeared too, not only him but Dream! Error knows something but will not say anything. What could be so powerful to make A.U.s just go like that that no one knows about? With each passing day more A.U.s go! What ever this great power is, enemies must unit to stop it. Differences must be set aside. Everyone left must work together to stop this rising problem before it is too late. Can the missing universes be brought back or is it too late?
  • TODO POR TI (Fontcest - Underfell) by amoyaoihard
    amoyaoihard
    • WpView
      Reads 220
    • WpPart
      Parts 4
    Lo siento por no seguir con las otras historia pero les prometo que las continuare. Bueno esta historia grata de mostrar que Papyrus va hacer todo para que su hermano este feliz aunque Sans no sepa.
  • Adopting the Skeleton Brothers by KatrinaTronis
    KatrinaTronis
    • WpView
      Reads 136
    • WpPart
      Parts 3
    Year: 20XX Monsters were finally above ground. They had been trapped in Mt. Ebbot for years. Some of the monsters were just babies. I adopted two of those babies.... Undertale belongs to Toby Fox. Katy belongs to me.
  • ACEPTACIÓN (FONCEST) by Blacknekomi
    Blacknekomi
    • WpView
      Reads 259
    • WpPart
      Parts 3
    Al final lo abandonaría, no?. Si su hermano encontraba a alguien con quien compartir sus estúpidas bromas, esa bebida amarga y su ilimitada disposición a no hacer nada...se iría de su lado. Pero el nunca llego a creer que su hermano encontraría una pareja con la cual duraría tanto...hasta ese día que los vio. Debería aceptar su relación? ***La portada no me pertenece Undertale pertenece a TobyFox
  • Undertale: Part Two by DalerBoiYT
    DalerBoiYT
    • WpView
      Reads 421
    • WpPart
      Parts 15
    Gaster is back. And he's out for revenge. Can the gang find out what his intentions are and stop him? Or will they be uncertain about what Gaster will do next? Read this book to find out! This story is related to Undertale and WILL NOT be an actual sequel. There will be deaths and drama in this so be warned. I am not sure but there may be a Part Three or Four but I can definitely say that there will be a sequel, prequel, or a spin-off to this so stay tuned!
  • Sans AUs x Reader || Lemon by just_here_forfun
    just_here_forfun
    • WpView
      Reads 151
    • WpPart
      Parts 3
    The cover art is not mine, I just found it on google and was unable to find the source. If you know who it is please tell me so I can credit them, thanks! This is lemon so it is NSFW!!
  • ★彡 𝐔𝐍𝐃𝐄𝐑𝐓𝐀𝐋𝐄 𝐀𝐔'𝐒 𝐎𝐧𝐞 𝐒𝐡𝐨𝐭𝐬 彡★ by Mllinn3100
    Mllinn3100
    • WpView
      Reads 6
    • WpPart
      Parts 1
    ᴛʜɪꜱ ɪꜱ ᴀɴ x ʀᴇᴀᴅᴇʀ ʙᴏᴏᴋ, ʜᴇʀᴇ ɪ ᴡɪʟʟ ᴡʀɪᴛᴇ ꜱᴍᴀʟʟ ꜱᴛᴏʀɪᴇꜱ ᴡɪᴛʜ ᴅɪꜰꜰᴇʀᴇɴᴛ ᴜɴᴅᴇʀᴛᴀʟᴇ ᴀᴜ ᴄʜᴀʀᴀᴄᴛᴇʀꜱ, ᴀɴᴅ ɴᴏᴛ ᴏɴʟʏ ꜱᴀɴꜱᴇꜱ. (ʜᴏɴᴇꜱᴛʟʏ ꜱᴘᴇᴀᴋɪɴɢ, ᴍᴏꜱᴛ ʟɪᴋᴇʟʏ ᴛʜᴇ ᴄʜᴀᴘᴛᴇʀꜱ ᴡɪʟʟ ᴄᴏᴍᴇ ᴏᴜᴛ ᴠᴇʀʏ ʀᴀʀᴇʟʏ, ʙᴇᴄᴀᴜꜱᴇ ɪ'ᴍ ɢᴏɪɴɢ ᴛᴏ ᴡʀɪᴛᴇ ᴀꜱ ɪ ᴡɪꜱʜ)
  • Games [Fell!Sans x Reader] by AyePapy
    AyePapy
    • WpView
      Reads 3,267
    • WpPart
      Parts 9
    Your fist clenched, unsure if you should punch the living daylight out of him, "Who said I was playing your game." "you don't have to say anything, you're automatically playing," He took a step back and walked past you with a lazy wink. "but at the end of every game, i always win. and you better believe it, sweetheart, i'll be leaving a permanent scar on your heart." [Title used to be "Commitment"] [Credits to: Undertale by Toby Fox Underfell adopted by the community Artists, editors and singers/band]
  • Miracles - fell poth by Edgefellpalette
    Edgefellpalette
    • WpView
      Reads 2,683
    • WpPart
      Parts 7
    You can guess who came up with the title Angel: ME!!
  • 【Undertale x Reader】 by attackonteetans
    attackonteetans
    • WpView
      Reads 21,891
    • WpPart
      Parts 7
    Requests are open~
  • Underfell! Sans x Reader [Short Oneshot] by percy_cameron19
    percy_cameron19
    • WpView
      Reads 10
    • WpPart
      Parts 1
    Trigger warning ahead. English isn't my first language so I'm sorry if there are some errors. [cover art isn't mine, i got it from reddit, r/Undertale, idk who the user is tho.]
  • fluffy and angsty undertale au oneshots for all you sad people by ghostcavernrae
    ghostcavernrae
    • WpView
      Reads 712
    • WpPart
      Parts 15
    side project working on glitchverse is making me think of lil stories bc im sad and im sure some people reading this are as well welcome i have officially adopted you, im your father now. wish for oneshots and you shall receive. read the things i wont write though :)
  • Bitting Bones (HoneyMustard) by Zombeeydoodels
    Zombeeydoodels
    • WpView
      Reads 28,872
    • WpPart
      Parts 19
    Non of the characters belong to me nor does the cover. Underfell was created by Kaitogirl Underswap was created by Popcorn Pr1nce So this is obviously a under swap papyrus x Underfell sans if you don't like fontcest then why are you here? Sans yet again got a beating from his brother. This time leaving another crack, physically and mentally. Sans was tired of it. If he wasn't needed he'll just go and let someone else be his brother's toy. On that night he left for better or worse and ended up in underswap going through a portal left behind by either error or ink sans in search of a new universe. Warning* Swearing, blood.
  • Undertale/AU X Reader one-shots by Undertale_Trash101
    Undertale_Trash101
    • WpView
      Reads 29,616
    • WpPart
      Parts 5
    Well. The title say it all. I will be taking requests!