Underswap Stories

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1.2K Stories

  • Fell For You by x-xFangirlx-x
    x-xFangirlx-x
    • WpView
      Reads 19,879
    • WpPart
      Parts 23
    Blue has fell, literally, into the Underfell Universe. When he gets there, he is captured by the Papyrus there and struggles to find a way back home to his friends. Things develop become interesting when both start to realize they have feelings for each other. Read the updated one, it is Fell For You: Rewritten, it is finished and updated.
  • Hugs? ( A CherryBerry Fanfic ) by Dynyamo
    Dynyamo
    • WpView
      Reads 59,653
    • WpPart
      Parts 26
    Summaries... my worst nightmare... Anyways, the characters of this book are not mine, they are from their creators of Undertale, Underswap, Underfell, etc. etc. Ever since the Alternate Universes of Undertale found out about each other, they started to come together in one place that lets all monsters from all Universes in. Only a few do stay there. Cover Art was created by me, DO NOT USE IT FOR ANYTHING ELSE, thank you.
  • I taco 'bout you  - Underswap Sans x Reader by CloverStream
    CloverStream
    • WpView
      Reads 47,845
    • WpPart
      Parts 23
    **OLD WRITING WARNING** You fell down a few weeks ago... Asgore is about to fight you. Your about to die. You call for help... Did somebody come? *I only drew the cover I don't own the characters or other art*
  • Ashes to Ashes and Dust to Dust by funnybone800
    funnybone800
    • WpView
      Reads 2,759
    • WpPart
      Parts 7
    Red finds Sans dying in an undertale world that's been cleaned of all life. Red is not usually kind-hearted. But confused and fearful, his memory unsure of what happened before he ended up here, he saves Sans's life. Let's just hope thing get better from here. INACTIVE
  • I'm Insanely In Love~ Dustberry. NaJ by lolbitbegaming
    lolbitbegaming
    • WpView
      Reads 3,623
    • WpPart
      Parts 6
    Dust is a complete... Nerd? Or better put. Phycopath... So he wears glasses and it keeps him sane. But he doesn't need them when he finds.. A blue scarfed happy skeleton. Now he keeps dust sane. He let's out. Both of them. They live happily.... This has a sad ending so! prepare yourself peeps. "Hi! I'm Blue!" "I-i-im Dust. Nice to meet you." ~ 2 years "hey dusty~" "hey Blue baby~" ~ the life story starts young and watch as opposites attract. ~ "I love you Dusty" "who wouldn't love you to'~?" ~ Fall in love, hate, go insane, Find more love ..........~ making love....... ~ ~ so I I'm.... love you guys and hope you enjoy
  • undertale x reader  by MooseMattie
    MooseMattie
    • WpView
      Reads 20
    • WpPart
      Parts 2
    just a bunch of short UT stories some will be aus some will have romance in them some won't. Some might have more than one part requests are open. Also there will be NSFW stuff (don't o Worry I'll. Mention it before a story it either being a smut or extra bloody ya know?) There are mention of sexual themes probably not in all the stories but here and there.
  • {Sanscest} - One Shots by RancidRetro
    RancidRetro
    • WpView
      Reads 301
    • WpPart
      Parts 3
    This story is NSFW only, and does not contain any fluff. If you are in serch of fluff, I suggest you go look at {Sanscest} - Fluff Shots. Thank you! All writing in this priticular book was written by me, either on my Alt account which is Bleeds_Pastel_Candy, or written directly into this book!
  • Different AU Sanses! x Reader One-shots! by BethanyWillows
    BethanyWillows
    • WpView
      Reads 591
    • WpPart
      Parts 4
    (I'm all new to this stuff....so I'm sorry if my officially first book would suck...) I'm making one-shots! and I can take requests from comments! and if I have wrong spellings and bad grammar...I'm extremely sorry about that... In this book, I won't do any lemons, smuts, etc. Because....It makes me really uncomfortable while doing it and I'm not really good at writing them either....so sorry. That also means...I'm not gonna do stories that involve Underlust and Undertail...Ok? Let's start!
  • Various UnderTale Short Fics by mewmewbomb
    mewmewbomb
    • WpView
      Reads 125
    • WpPart
      Parts 8
    Various UnderTale Short Fics (+ some extra junk), written by yours truly Red- UnderFell Sans Edge- UnderFell Papyrus Axe- HorrorTale Sans Snack- bitty HorrorTale Sans Blueberry- UnderSwap Sans Adrienne- my oc no idea if I'm gonna continue this or write more stuff associated with it, so let me know what you think in the comments Highest rank: #7 in the "snack" tag
  • How to write a lemon (FOR BEGINNERS!) by Kitten1o3
    Kitten1o3
    • WpView
      Reads 2,144
    • WpPart
      Parts 1
    Okay. For people who want to write good lemons, just come here! I'll be more than happy to help you through this book. Make sure to read some of my lemons to get ideas about the lemon you'd like to make! And this is book is to help anyone with ANY lemon they want to make, so don't worry! Need help with writing a lemon? Just Pm me and I'll be your personal editor, or I'll give you my email so I can personally edit it too! Now enjoy the sin factor of dis book! MUAHAHAHAHAHAHAHAHAHA
  • Ask and Dare Undertale, Storyshift and Storyswap! And Of Course Underswap by SassberrySnap
    SassberrySnap
    • WpView
      Reads 2,949
    • WpPart
      Parts 9
    SSwap Chara: ASK AND DARE ALL OF US HUMANS! Shift Azzy: AND BOW BEFORE YOUR MIGHTY DEITY! Sans: we aren't all humans..
  • Undertale:The multiverse error (On Hold) by Single__Shadow
    Single__Shadow
    • WpView
      Reads 622
    • WpPart
      Parts 21
    I have decided to us undertale,flowerfell,underswap, dusttale, errortale, Inktale, outertale, storyshift, cattale, Echotale and SST for my story, so please in joy💙💜❤💚💛 I will be adding more au to my book
  • Undertale AU Headcannons! by HybridMageStories
    HybridMageStories
    • WpView
      Reads 395
    • WpPart
      Parts 5
    Just some headcannons I thought up in my spare time! Prepare for heavy shipping, analyzing, looking really deeply into lore and some of Game Theory's videos because... yeah... They're good okay? I do almost all AU's excluding certain ones... *glances at UnderLust* Yeah... Rating: Fairly calm, minimal bleeped out cussing. Disclaimer: Not my picture! Undertale belongs to Toby Fox and all AU's belong to respective owners!
  • Undertale AU ship Roleplay  by -the_stranger-
    -the_stranger-
    • WpView
      Reads 18
    • WpPart
      Parts 1
    If anyone wants to Rp undertale AU sans's or something then here :/
  • MY HUMAN! (( Yandere!Blueberry x Reader )) by LaPUNisher
    LaPUNisher
    • WpView
      Reads 349
    • WpPart
      Parts 1
    "What's wrong human? Don't you like it?" "I D I D I T J U S T F O R Y O U ." (( I DO NOT OWN THE YANDERE!BLUEBERRY AU. NOR DO I OWN YANDERETALE. OR UNDERSWAP. OR UNDERTALE, OR ANY OF THE ART. ALL CREDIT TO THE ORIGINAL OWNERS ))
  • Undertale one shots by CallieTheTroll
    CallieTheTroll
    • WpView
      Reads 36,802
    • WpPart
      Parts 21
    This book has: -Normal -Underfell -Underswap -Swaptale And any other versions you can think of Requests are closed.
  • UniverSwap [Undertale AU Fr] {Terminé} by plus_personne
    plus_personne
    • WpView
      Reads 8,257
    • WpPart
      Parts 56
    Son univers change. Elle change et ils changeront. Pour le mieux ou pour le pire, personne ne serais vous le dire. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Ceci est la suite de From Underswap to Undertale. Vous n'avez pas trop à vous inquiéter, si vous ne l'avez pas lu bah, commencez par la suite si ça vous chante. À savoir que la suite est totalement différente du commencement et que c'est un peu juste pour mettre en place l'univers d'Universwap et faire en sorte que notre personnage principale ait quelques connaissances. Ce n'est pas cela qui vous empêchera de comprendre l'histoire. Undertale appartient à Toby Fox. Les personnages des différents AU's appartiennent à leurs créateurs respectifs. J'ai quelques personnages qui m'appartiennent. UniverSwap, SicklyTale et LackyTale viennent de moi. BONE lecture! *You are filled with Determination* À plus, -Haut_Fée_Lit
  • Undertale AU Preferences by lemonscentedsocks
    lemonscentedsocks
    • WpView
      Reads 125
    • WpPart
      Parts 2
    just some headcanons/ideas of how I think the different AU sanses and papyruses would act in a romantic situation :>
  • This is a problem. by Moonsongdream
    Moonsongdream
    • WpView
      Reads 219
    • WpPart
      Parts 2
    I got the idea from the comment section of the oneshot "Problem" in @FallenAsleepYetAgain 's Nightmare x Blue Oneshots book. Picture's by A lone artist and writer on Tumblr Nightmare is all powerful. An absolute beacon of fear and despair throughout the multiverse. His name is spoken only in terrified whispers, or sometimes not even spoken at all. Those who become his prisoners rarely leave the castle in one piece, if ever. So it's as much a surprise to him as to anyone else when he begins to wonder what it would be like to be subservient to one particular prisoner of his... !!This book contains NM being an absolute SIMP!!
  • A Crystallized Amethyst by KTamao20
    KTamao20
    • WpView
      Reads 316
    • WpPart
      Parts 7
    Crystallize [kris-tl-ahyz] refers to the process where a liquid or gas transforms into a rigid, structured crystal lattice. Or... I look at my other two Avallon and thought 'Yeah I could do more angst with these bois.'