Underswapsans Stories

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244 Stories

  • A Miscalculation In Space by Readern111
    Readern111
    • WpView
      Reads 18,787
    • WpPart
      Parts 19
    He knows he'll be dooming them if he falls, but he's tired, his body is breaking apart, held together on a higher being's whim only. He wonders if there'll be another to replace him. He wonders if there will be none. It's rather silly, really, since he won't even be around to witness that. The crowd, the rage and bloodthirst palpable in the air will ensure that. If he does not fall on his own, others will force him to. Or, in other words, the typical start of Error being forced to jump into the Void one way or another, in this case into the NaJ universe! The cover art belongs to irodimmatcha on deviantart(will take down if the artist asks me to)! Updates will be highly inconsistent. Edit: Now cross posted on Ao3 under the same username!
  • More Than I Should [A US!Sans x Female Reader] by _OneBeanHalfABrain_
    _OneBeanHalfABrain_
    • WpView
      Reads 93
    • WpPart
      Parts 3
    A human... An infant... Left in a tattered basket... Left crying in a cushion of golden flowers... Left only with a blanket and a locket bearing her name... (Y/n)... Raised by Asgore, spending her life in the ruins... She was bound to made many wonderful new friends... But... What if one... Is no ordinary friend? ... |{A/n: This book (at least the first few chapters) was slightly inspired by EightTheKat's comic 'The Seventh Soul'. Unless specified by me, none of the art contained is mine. Undertale belongs to Toby Fox. Underswap belongs to Popcorn Pr1nce (i think). Also the first couple reads are probably from me rereading this cuz I do that XD Also, updates will be slow, so I apologize in advance.}|
  • Fanart of "A Trio of Misfits" by JulieRagsdale1
    JulieRagsdale1
    • WpView
      Reads 658
    • WpPart
      Parts 2
    This is from a great fanfiction called "A Trio of Misfits" from Sabinarius. It's a really great story and if you haven't read it, I strongly suggest you do. I don't own anything. Not the story. Not the characters. Just the art.
  • Cherryberry / Fellberry oneshots •|• lemon (NSFW) •|• by _GenoSwap_
    _GenoSwap_
    • WpView
      Reads 64
    • WpPart
      Parts 1
    basically what the title says (Swap will be female btw)
  • Medieval Ages Orphanage AU (Error Sans Fanfic) by mottledmagpie
    mottledmagpie
    • WpView
      Reads 8
    • WpPart
      Parts 1
    A Medieval Ages Orphanage AU following Error, a skeleton monster child who was a result of unplanned pregnancy of his mother. A/N: There <are> ships here, and you're free to guess on who will end up with who! BUT canon couples will only be revealed at the end! (〃^▽^〃)o <3 ...I honestly doubt anyone will read this, lol. ✍(T◡T)
  • Swap sans x reader by glitchyartist_
    glitchyartist_
    • WpView
      Reads 41
    • WpPart
      Parts 7
    First story lol, hope you like it
  • Chaotic Times for a Chaotic Duo by Tigercoolyeet
    Tigercoolyeet
    • WpView
      Reads 97
    • WpPart
      Parts 1
    In which Error and Blue have had enough of The Council's bullshit and get payback. In other words, two grown men acting like children and trashing their rivals' big, grand-ass castle for the funsies. The cover image is just something random and it isn't correlated at all with the story adebiudew
  • Undertale AUs go to Space by AliceCircus54
    AliceCircus54
    • WpView
      Reads 166
    • WpPart
      Parts 7
    Classic: Hi guys, Ink and Dream: *Gasps* h- *a portal appears*, Edge: Um, what's that?, Flower: idk, Geno: idk either, Sci: idk, Classic: I get it, we all don't know, Echo: Yea, Outer: Um... irdk, Classic: I GET IT!!!, Outer: Ok, Geno: Ok, Flower: Are we just going to stay here or..., *they get sucked in the portal* Undertale belongs to Toby Fox
  • The Sans Party! [ENDED] by DinoDren
    DinoDren
    • WpView
      Reads 505,448
    • WpPart
      Parts 111
    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 Cover by me :3 ☆Sans | UnderTale ☆Fell | UnderFell | ? ☆Outer | OuterTale | ? ☆Swap | UnderSwap | ? ☆Geno | AfterTale | loverofpiggies ☆Error | ErrorTale | loverofpiggies ☆Fresh | UnderFresh | loverofpiggies ☆G | ?/original: UnderPatch((abandoned AU)) | borurou ☆Science or Sci | ? | ? ☆Death/Reaper | ReaperTale | ren-rink ☆Ink | InkTale | comyet ☆Greaser | ?((supposedly for Lucidia)) | rodsee ☆Dance | DanceTale | dancetale ☆Chess | ChessTale | ? ☆Katana | KatanaTale | ? ☆Dream | DreamTale | jokublog ☆Nightmare | DreamTale | jokublog ☆Sensy/Senkiller | UnderNC | anrez-op-skele ☆Ganz | GZTale | golzy ☆Melancholy | GZTale | golzy ☆Alter | AlterTale | friisan ☆Horror | HorrorTale | sour-apple-studios ☆Little | LittleTale | mudkipful ((spontaneous updates; updates every Saturday/Sunday/ if possible))
  • Ask Blueberry Sans! Pt 2! by Phantom_Vista
    Phantom_Vista
    • WpView
      Reads 5,324
    • WpPart
      Parts 52
    Mwehehehe! Look at that boys (and gal)! We have another A/ D for Blue! And you guys as well XD Us! Papyrus: *casually clapping* Uf! Sans: *watching Blue* Blueberry: *shakes head from side to side* // Now I'll try to answer as quickly as possible so >w<
  • UnderSwap'SansXReader! by SansyReditXP
    SansyReditXP
    • WpView
      Reads 16,899
    • WpPart
      Parts 22
    Hello People! This is my first Fanfiction and Please Do not Judge me :> be good alright? "All of your Save Files Have been Wrecked,now you start to a New world.. Will you Continue to go back? Or Stay the one you Love? The Art Was by Me :> The character doesn't belong to me The original character belong to 'TobyFox
  • the unamused captive by Fandomfrenzy625
    Fandomfrenzy625
    • WpView
      Reads 26,655
    • WpPart
      Parts 16
    being pulled away from your home while your simply enjoying some alone time can be annoying and to make it worse you have no say in the matter as 2 teams keep throwing you too and thro through different dimensions (I do not own any characters mentioned in this book or the franchise they originally belong to, nor do I own any art)
  • Crossy! by bullymacdonald
    bullymacdonald
    • WpView
      Reads 114
    • WpPart
      Parts 4
    Watch an adorable fluffi boi and his adventures in this book filled with nothing but fluff. the ships featured in this book are made of reinforced steel, provided by Rekitralf Incorporated. First entry in the SLO (Skittle Literary Omniverse) Written by Me Produced by Me Directed by Me Created by Me Me created by Mom and Dad Mom created by Grandma and Grandpa Dad created by other Grandma and other Grandpa Cover Art by Clichely Characters by *inhales*
  • Changes (An Undertale Fanfiction) by looloo900
    looloo900
    • WpView
      Reads 2,784
    • WpPart
      Parts 10
    When Frisk wakes up and says 'hi' to the skeleton brothers, not focusing who is who but notices slight differences as they become more awake. Cover credit to: ttboa.deviantart.com Undertale credit: Toby Fox
  • A Forgotten Past (Long Hiatus) by Exoten
    Exoten
    • WpView
      Reads 3,196
    • WpPart
      Parts 6
    Everybody sees the bright and magnificent Sans as a happy soul. He's constantly smiling and boasting about himself, and is inclined to deal mercy to anyone, even his enemies. Little do outsiders know, Sans had a dark past with his father and, as his father's memory is restored, will have a dark future. I don't think I'll finish this series because I've grown to dislike it and I have no motivation to write. I really hate how little care I put into this story when I first made it. I basically wrote down whatever came to mind without giving it much thought. And then I hit a roadblock when it came to progressing the stories and making the characters accurate, realistic, and likable. I've seen many works of writing, shows, and visual novels since this book went on hiatus that have very well-made stories and inspire me. I wish to create content much greater than this story once I have motivation. I apologize to all of you who genuinely liked and followed this series closely. I know how upsetting it is when something you like might never be completed, and now I'm bringing this feeling down on others. Thanks to all who went out of their way to read this message. Also thanks to all who enjoyed A Forgotten Past. Hopefully I'll be able to write great stories in the future, but for now, I'll be signing off. See you again someday!
  • when crushing gets involve. [ xreader ] by amaichu
    amaichu
    • WpView
      Reads 1,837
    • WpPart
      Parts 5
    Silver Oak Academy, a school for peculiar students. Will you survive? Read to find out! [probably slow updates]
  •   ᴛɪʀᴇᴅ | ᴀ sʜᴀᴛᴛᴇʀᴇᴅ ᴅʀᴇᴀᴍ  ғᴀɴғɪᴄ by -nothingspecialhere-
    -nothingspecialhere-
    • WpView
      Reads 17,609
    • WpPart
      Parts 7
    Ever since dream ate the black Apple and got corrupted things started to get harded on him then before The remaining members of the star sanses just won't leave him alone and nightmare still seems to despise him he's starting to regret eating the black apple he's..tired can't things go back to how they were? Even if things still weren't that good even then at least he had someone to go to for comfort. But now thing's are different things can't go back to normal He's just very tired.. [Cover of art doesn't belong to me] < slow updates < all characters belong to there rightful owners [_credits__] Dream and nightmare- Jokublog Shattered dream- Drawingerror Sans- toby fox Swap sans- POpcornPr1nce (original owner) / au community Dust/murder sans- Calvateyla Ink sans - Comyet/Myebi Error sans - lover of piggies/crayon queen Horror sans- sour-apples-studios Killer sans- Rahafwabas [More might be added)
  • The Star That Got Away by SwapSans_Addict
    SwapSans_Addict
    • WpView
      Reads 438
    • WpPart
      Parts 1
    To be honest, I don't really know what to call this. It's not exactly a oneshot, atleast I think, nor is it a specific tale. I guess you could just call this worldbuilding, or a weird, stale, salty spaghetti idea? Idk, it's really just a weird idea I came up with and thought: "Hey, why don't I write this, with no guide or thought out plan" Bad Guys x Blue (Art not mine, obviously.)
  • The start to a long tail by RedBlueSoul
    RedBlueSoul
    • WpView
      Reads 615
    • WpPart
      Parts 9
    This story is an undertale fanfic I fave made, the story will explain itself as time unfolds Undertale is created by Toby fox and I do not plan on taking it or the community!