1 - 20 of 1332 Works in Alternate Universe - Underswap (Undertale)

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  1. Tags
    Summary

    You're just trying to live your life peacefully with your childhood feline while being no higher than 15 inches tall. Life is actually decent for a good stretch of it! Too bad it'll crash around you. Cool. Great. Yup, just what ya wanted. Double thumbs up.

    Being a bitty is tough work as it is.
    But a mentally insane one? Well, now you're just speaking in tongues!

    Language:
    English
    Words:
    2,683
    Chapters:
    1/1
    Hits:
    0
  2. Tags
    Summary

    Humanity is divided over one thing, the monsters reappearance. Some believe they should stay aboveground and others think they should be sent back where they came from. Then, there are those like you who don't know what to think yet. What will happen once you become acquainted with two skeleton brothers? Will you finally decide your standing on this issue and will you find love along the way?

    Language:
    English
    Words:
    96,289
    Chapters:
    41/?
    Comments:
    43
    Kudos:
    137
    Bookmarks:
    30
    Hits:
    2579
  3. Tags
    Summary

    Grillby was starting to hate Sundays. Luckily, after a bet doesn't go in his favor, he finds that this Sunday might've been worth the trouble.

    Language:
    English
    Words:
    7,418
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    4
    Hits:
    30
  4. Tags
    Summary

    In which Connor is bought by a father in order to take care of his child, Kara dreams of creating a world where androids can be free, and Markus is the android sent by Cyberlife.

    More different from canon than you'd think, yet more similar than you might realize. Now featuring confusion, slow burn, foreshadowing, and enough salt to kill a man.

    Language:
    English
    Words:
    57,958
    Chapters:
    23/?
    Comments:
    384
    Kudos:
    563
    Bookmarks:
    95
    Hits:
    7165
  5. Tags
    Summary

    Roleplay between my friend and I, in a special AU created thanks to Askellie.

    ----------------------------------------------

    A city made by lost Sanses where other monsters who lost their world appear instead of disappearing. There, so many people is the same. You can see two identical Undynes chatting in a bar, you can be friend with four same Papyrus, you can see yourself succeed or fail… but it’s still not you.
    Everyone seem to be you. How can you not feel lost in a place where everything that makes you unique applies to everyone? It’s easier to lose yourself when you don’t know who you are anymore.

    -------------------------------------------------------
    Arc 1:
    Cherry just arrived as a Lost Soul in the big City. Starving, he found the help of a Undyne who gave him the address of someone who can help him.

    Series
    Language:
    English
    Words:
    51,401
    Chapters:
    14/?
    Comments:
    77
    Kudos:
    58
    Bookmarks:
    7
    Hits:
    1019
  6. Tags
    Summary

    Where Reader joins Papy on a stroll through the woods, but the skeleton has a few surprises up his sleeve. Namely a ton of popsicles.

    Series
    Language:
    English
    Words:
    3,535
    Chapters:
    2/2
    Comments:
    17
    Kudos:
    107
    Bookmarks:
    17
    Hits:
    3213
  7. Tags
    Summary

    Where Reader is strung up by Papy in the basement, and sexy fun times ensue.

    Series
    Language:
    English
    Words:
    4,042
    Chapters:
    2/2
    Comments:
    14
    Kudos:
    152
    Bookmarks:
    18
    Hits:
    4097
  8. Tags
    Summary

    You knew you shouldn't have gone singing with these two...

    Language:
    English
    Words:
    258
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    20
    Hits:
    123
  9. Tags
    Language:
    English
    Words:
    637
    Chapters:
    1/?
    Comments:
    6
    Kudos:
    18
    Bookmarks:
    1
    Hits:
    97
  10. Tags
    Summary

    We all know the drill. A human falls, they're coddled in the Ruins, and sent away to decide the fate of all monsters. More often than not, the human will risk their own safety for the chance to befriend their foes. Even if it means facing their own death.

    Oh, if only it was that easy this time, dear Reader.

    You see, you weren't the only one who fell.

    Your little brother came along for the tumble, and you'll be damned if you don't keep him safe.

    Language:
    English
    Words:
    35,426
    Chapters:
    14/?
    Comments:
    178
    Kudos:
    271
    Bookmarks:
    41
    Hits:
    2299
  11. Tags
    Summary

    Annoyed by their brothers' persistent pushing in their romantic lives, Edge and Ash pretend to date to get them off their backs, but what was a simple arrangement, turned into mutual growth, deepening love, and heartbreak.

    Language:
    English
    Words:
    4,181
    Chapters:
    3/?
    Comments:
    17
    Kudos:
    22
    Bookmarks:
    2
    Hits:
    234
  12. Tags
    Summary

    One day, one phobia
    How they started, how they appear, how the characters deal with it, it can vary from chapter to chapter.
    Only one thing is sure: there is no fluffy ending for these

    Language:
    English
    Words:
    11,526
    Chapters:
    16/31
    Comments:
    25
    Kudos:
    65
    Bookmarks:
    5
    Hits:
    1602
  13. Tags
    Summary

    Your life takes a turn when you take up the offer to do therapy with a group of skeletons. Let the games begin.

    Language:
    English
    Words:
    52,327
    Chapters:
    20/?
    Comments:
    118
    Kudos:
    318
    Bookmarks:
    47
    Hits:
    4292
  14. Tags
    Summary

    Papyrus finds you when you have nowhere to go. Now you live with eight skeletons. You don’t mind this arrangement.

    Most of the time.

    Language:
    English
    Words:
    71,839
    Chapters:
    32/?
    Comments:
    611
    Kudos:
    664
    Bookmarks:
    115
    Hits:
    12000
  15. Tags
    Summary

    Stretch is still recovering from being sick and Edge is recovering from dealing with him being sick. They make it work.

    Series
    Language:
    English
    Words:
    4,591
    Chapters:
    2/2
    Comments:
    14
    Kudos:
    41
    Bookmarks:
    5
    Hits:
    178
  16. Tags
    Summary

    I found Hunger Games Simulator and put every pairing I could think of against each other (Crack and All with the exception of Fontcest) against each other, and placed each winner on the list for their own oneshot, even if I liked them or not, and tried to do them all justice.
    Chapter One: Horrortale Sansby
    Chapter Two: Papby
    Chapter Three: Grillriel (Grillby x Toriel)
    Chapter Four: Toriblook (Toriel x Napstablook)
    Chapter Five: Inkriel (Ink x Toriel)
    Chapter Six: Littletale Soriel
    Chapter Seven: Papyton
    Chapter Eight: Asgoffet (Asgore x Muffet)
    Chapter Nine: Underfell Soriel
    Chapter Ten: Underswap Gastriel (Gaster x Toriel)

    Language:
    English
    Words:
    4,196
    Chapters:
    4/10
    Kudos:
    2
    Hits:
    58
  17. Tags
    Summary

    Stretch gets help with his heat

    Language:
    English
    Words:
    2,095
    Chapters:
    2/2
    Comments:
    1
    Kudos:
    35
    Bookmarks:
    3
    Hits:
    404
  18. Tags
    Summary

    getting kicked out was embarrassing, but your close friend Papyrus finding you crying in the corner of the library is even more embarrassing. At least, to you it is.

    You didn't expect to suddenly be swept up into the lives of a bunch of skeletons, nor did you expect to feel for them. Guess the world is full of surprises huh?

    Language:
    English
    Words:
    5,005
    Chapters:
    1/?
    Comments:
    13
    Kudos:
    24
    Bookmarks:
    4
    Hits:
    213
  19. Tags
    Summary

    You've been friends with the skeletons since they moved in a few months ago. You consider them all to be your friends, best friends even. You decided to invite your twin over to meet them after they moved in with you.

    For some reason all the skeletons seem to have fallen for your twin and they ask you for advice. You're fine with it since your twin likes them too!

    But then why does it hurt so much?

    Language:
    English
    Words:
    9,293
    Chapters:
    5/?
    Comments:
    103
    Kudos:
    160
    Bookmarks:
    29
    Hits:
    2022
  20. Tags
    Summary

    Cops are pigs, Detriot is just a slum spray painted gold, and RA9 is suffocating under the weight of the world. What is RA9 you ask, no it's really a question of who is RA9, and who they are is something you'll never find out. Or at least that's how it was supposed to be...

    ~ In which Richard is a hitman, Connor is a negotiator, Hank keeps the two alive, Gavin gets the biggest betrayal of his life, and Markus is just trying to thrive~

    Alt. Title: Be Gay Do Crime

    Language:
    English
    Words:
    13,236
    Chapters:
    6/?
    Comments:
    10
    Kudos:
    48
    Bookmarks:
    10
    Hits:
    605

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