1 - 20 of 2720 Works in Alternate Universe - Underswap (Undertale)

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  1. Tags
    Summary

    yeaaa, i really do be chugging these out huh...

    Language:
    English
    Words:
    876
    Chapters:
    3/?
    Hits:
    21
  2. Tags
    Summary

    Unlike many other stories loosely inspired by the likes of Skeleton Squatters and the Landlady by Tyrant_Tortoise, the female-presenting reader, which uses second-person perspective, are not from 'this' modern universe at all - not even a variant. To clarify, your home is a sort of mix between conventional fantasy and modern city life, or otherwise considered modern fantasy.

    You aren't going to have a good time.

    erratic updates, since i don't have much actually written down.

    Language:
    English
    Words:
    3,623
    Chapters:
    5/?
    Comments:
    7
    Kudos:
    20
    Bookmarks:
    7
    Hits:
    350
  3. Tags
    Summary

    Just some bits and pieces of Undertale & AU one shots and short scenarios. I'll try my best, but you know, writing is hard sometimes. ¯\_(ツ)_/¯

    This is my first time posting on AO3, so please go easy on me. I'll add more to the tags when I know how.

    Language:
    English
    Words:
    771
    Chapters:
    1/?
    Comments:
    2
    Kudos:
    5
    Hits:
    30
  4. Tags
    Summary

    Redoing this,I’m sorry but this plot was stupid and annoying. Also the reader is gonna be a thief,and their gonna be human.

    I’m gonna atleast try to write 1000 words?

    Language:
    English
    Words:
    1,051
    Chapters:
    4/?
    Comments:
    8
    Kudos:
    13
    Bookmarks:
    3
    Hits:
    233
  5. Tags
    Summary

    A collection of inane nonsense (ranging from Error being reincarnated as Palette to Dust finding a new love for the color pink) circling around the many AUs and Multiverses of the Undertale world. Some stories will be connected; Others will be random one-shots.

    Stop by and see what treasures, or horrors, you can find.

    Series
    Language:
    English
    Words:
    116,999
    Chapters:
    124/?
    Comments:
    1550
    Kudos:
    790
    Bookmarks:
    72
    Hits:
    21649
  6. Tags
    Summary

    Sometimes life throws you a curveball. For you, your curveball was going to bed looking like a human, and waking up looking like a monster.

    A skeleton monster to be precise.

    With the barrier breaking, a large surge of magic descended on the town you live in, and transformed you overnight. Unsure what to do with you, and the others changed, you're ushered into a facility until a monster with similar magic can take you to teach you how to wield the now uncontrollable magic you've been given. After waiting in this place for four years, you'd given up hope that anyone would ever want to take you.

    What a surprise for you when you find out that someone does. A lot of someones.

    Language:
    English
    Words:
    213,974
    Chapters:
    30/?
    Comments:
    1596
    Kudos:
    1840
    Bookmarks:
    400
    Hits:
    51609
  7. Tags
    Summary

    Disoriented and emotionally frayed from decades spent in the void, W.D Gaster suddenly finds himself at the mercy of a cold and arrogant alternate self. His doppelganger promises to return him to the void once his research is complete but before he can make due on his threat, Gaster is introduced to this world’s variant of his son and he is forced to make a quick, spare of the moment decision.

    This sole act sends unforeseen ripples throughout the Multiverse and hurdles Gaster on a perilous journey across it to find his way home.

    or

    Dadster plays hopscotch across the multiverse, unintentionally and intentionally acquires children, tentatively reciprocates Grillby's feelings, engages in actual literal custody battles with copies of himself, somehow steals a Bad Sans™, narrowly avoids death at the hands of Error and somehow flies under Ink’s radar for a shocking amount of time.

    Language:
    English
    Words:
    22,179
    Chapters:
    6/?
    Comments:
    56
    Kudos:
    64
    Bookmarks:
    17
    Hits:
    596
  8. Tags
    Summary

    When a dog is found in the Underground, Sans decided to keep the Mutt as a guard-dog and bait catcher.

    What happens when universes collide and this dog... isn't even a dog?

    Language:
    English
    Words:
    10,364
    Chapters:
    9/?
    Comments:
    21
    Kudos:
    94
    Bookmarks:
    21
    Hits:
    1082
  9. Tags
    Summary

    What... Happened? (Y/N), is a girl that wakes up in a hospital not knowing where she is, she was told to have amnesia over something that happened years ago that made her go into a coma for 5 years. Later, she inherits a little house, when she goes in she finds a note with a necklace that gives her strange abilities saying that she has to recover her memories a certain way because a disastrous event is coming and it’s up to her to save the multiverse. Will she be able to do it? And what surprises await her?

    Language:
    English
    Words:
    36,516
    Chapters:
    15/?
    Comments:
    9
    Kudos:
    36
    Bookmarks:
    13
    Hits:
    1155
  10. Tags
    Summary

    You woke up to a dizzying headache. Your arm and left leg hurt too. Something felt wet around your head. You tried lifting your right arm to touch your head. Your eyes blinked open and you held your hand in front of you. It was red with what you assumed was blood. You slowly cast your eyes around you and were met with gravel laid dirt. You blinked because you knew that couldn't be right. You had been on your trip, there was no way for you to have gotten dirty. Then it hit you, you were on a plane before this.

    Updated sporadically due to Bonely Rose's being my main fic. This is comment driven voter fic.

    Language:
    English
    Words:
    3,899
    Chapters:
    5/?
    Comments:
    70
    Kudos:
    98
    Bookmarks:
    29
    Hits:
    1568
  11. Tags
    Summary

    Plot device is convenient, and the Human always causes mischief. Thanks to said mischief, the skeletons are introduced to entirely new world, one that is both adorable and disturbing all at once.

    Bitties may be simliar to other verisons of Bitties but they are not all exactly the same.

    A continuation of Light Drizzles introducing the Bitty Universe, turning out to be so massive it needed it’s own separate story dedicated to it. It is recommended you read Light Drizzles before reading this, but of course you don’t have to. There are some context stuff and events from the first story that are referenced to here.

    Featuring lots of Bitty artwork in most of the chapters!

    Master Name Key at the Bottom!

    Series
    Language:
    English
    Words:
    96,696
    Chapters:
    22/?
    Comments:
    48
    Kudos:
    16
    Bookmarks:
    2
    Hits:
    774
  12. Tags
    Summary

    A collection of one-shots, presented in no particular order, from a half-Swapped version of Undertale.

    Chapter 6: In which Wingdings forewarns about the importance of good time management.
    Chapter 7: In which Papyrus has a  B a d   T i m e. (And so does everyone else, for that matter.)
    Chapter 8: In which Frisk asks Sans for a monster lullaby. So does Papyrus, in his own way.
    Chapter 9: In which four friends gather to enjoy an evening of anime and each other's company.
    Chapter 10: In which three friends meet up, without their usual fourth, to watch an anime of debatable lewdness.

    Series
    Language:
    English
    Words:
    39,182
    Chapters:
    13/?
    Comments:
    20
    Kudos:
    56
    Bookmarks:
    5
    Hits:
    1119
  13. Tags
    Summary

    You just had one year left to finish college and graduate with the course of your choice... Not until your aunt left you the responsibility of being a caretaker in her old Victorian house. With her promise of paying for your college funds the next year in exchange of having her property rented by at least two monsters, you had no choice but to oblige. You never cared about the monsters arriving at the surface nor had any strong opinions about it.

    But that perspective changed when two skeleton siblings showed up at your doorstep, holding a poorly drawn brochure to your face, a bag of G resting in your front porch... And when you realized how it was fun to tease and play little games with the older brother named Sans.

    Language:
    English
    Words:
    28,712
    Chapters:
    5/?
    Comments:
    17
    Kudos:
    37
    Bookmarks:
    9
    Hits:
    706
  14. Tags
    Summary

    Are you up to some sin today? These two totally are!
    NSFW Underswap Papara, grown ups only!

    Language:
    English
    Words:
    28,385
    Chapters:
    15/?
    Comments:
    11
    Kudos:
    14
    Hits:
    314
  15. Tags
    Summary

    Well, you know the saying, no good deed goes unpunished. While searching Mt Ebott for a missing child, you and your friends fall into the UNDERGROUND, a place full of monsters, ruled over by an angry queen who wants human souls. A place that, long ago, you yourself had been trapped in. Your choices now will affect the lives of everyone around you, and you’ll learn that the best lost and found stories are not about things, but about people.

    Language:
    English
    Words:
    5,203
    Chapters:
    4/?
    Comments:
    2
    Bookmarks:
    2
    Hits:
    43
  16. Tags
    Summary

    After who knows how long of being locked away from the world, it was a sudden change of pace when (Name) saw a set of brightly lit eye lights staring straight back at her from the other side of her prison.
    Who was this person?
    What happened after the war?
    Where was everyone?
    ....How long was she gone for?

    Language:
    English
    Words:
    3,935
    Chapters:
    1/?
    Comments:
    3
    Kudos:
    41
    Bookmarks:
    9
    Hits:
    192
  17. Tags
    Summary

    Le lieutenant Boid est encore plus énervé que d’habitude. Ce serait pas à cause des bruits qui courent sur lui et un certain docteur ?

    Language:
    Français
    Words:
    3,421
    Chapters:
    1/1
    Comments:
    4
    Kudos:
    16
    Bookmarks:
    1
    Hits:
    60
  18. Tags
    Summary

    Go on vacation, they said!
    You need to relax a bit more in a nice place, they have said so politely!
    Visit an exotic place, they said!
    Nothing can go wrong in a ship, they said totally convinced!
    You need to meet someone nice and start a relationship, they said worriedly!
    And you have listened to them over and over again… Why did you listen to them?
    WHY?
    Someone, any kind of deity… could somebody tell you just WHY is this happening to you?

    Why are you lost in what seems like an island lost from the hand of man in the middle of nowhere with weird creatures that seems like monsters that are trying to court you in the most ridiculous ways possible… and why must all of them be fucking skeletons!!!

    And why, oh god WHY do you think they’re HOT beauties out of nowhere?
    Are you really that lonely or is this island somehow messing up with your mind?

    Language:
    English
    Words:
    29,475
    Chapters:
    7/?
    Comments:
    211
    Kudos:
    317
    Bookmarks:
    58
    Hits:
    4126
  19. Tags
    Summary

    ~Ava’s Guide to Invading the Multiverse~
    Step One - Go Fishing

    Language:
    English
    Words:
    289,899
    Chapters:
    102/?
    Comments:
    2672
    Kudos:
    1528
    Bookmarks:
    187
    Hits:
    29686
  20. Tags
    Summary

    Getting the craziest one off my chest going to be making a one-shot book similar to the one for 'Poison Apples in the Garden'. This is as close to non-con as you dirty sinners are gonna get so enjoy it! As for this whole thing canonically I'll let you decide that 7u7 the only thing I can say is up to the dinner scene the fact Moon did kill a bunch of party goers is true it is what led to her being taken out of Underswap!

    Anywho enjoy this smut you filthy awesome readers, and lemme hear your thoughts~ Next will be Error.
    (Oh and this is in a freeform POV)

    Series
    Language:
    English
    Words:
    2,085
    Chapters:
    1/1
    Kudos:
    2
    Hits:
    59

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