1 - 20 of 1566 Works in Alternate Universe - Underfell

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  1. Tags
    Summary

    I've been working on the Story of Anna - The soul of Justice, and older sister to Frisk - for a while now, and decided to experiment with the Underfell version. (The Undertale version will be released on completion)

    Anna awakes to find Frisk missing, and finds herself in the Underground during her search. Now Anna must defend Frisk and Flowey from the countless bloodthirsty monsters that rule the Underground, all while trying not to hurt anyone - at the bequest of her two companions. Her Justice soul pushes her to keep these dangerous creatures contained, but can they prove to her that they are worth saving?

    (SansxOC involved in later chapters)

    Language:
    English
    Words:
    18,607
    Chapters:
    9/?
    Comments:
    4
    Kudos:
    11
    Bookmarks:
    3
    Hits:
    161
  2. Tags
    Summary

    Side stories set in the same world as The World, Upside Down, highly recommend reading that before this. Tales of Frisk's life before and after coming to this new world, of the lives of monsters before Frisk arrived, and some from the lives of others in another world as well. UPDATES EVERY WEDNESDAY

    Series
    Language:
    English
    Words:
    114,442
    Chapters:
    25/?
    Comments:
    126
    Kudos:
    76
    Bookmarks:
    15
    Hits:
    1609
  3. Tags
    Summary

    Sans wreck the heck outta' Papyrus.

    Language:
    English
    Words:
    1,279
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    5
    Hits:
    180
  4. Tags
    Summary

    An Undertale drabble/short story collection.

    I present you with the UFbros, SF Sans and Alphys, a bit of Afterdeath, our classic Snowdin citizens, our daily dose of Swapfell conquering Underswap, Classicberry fluff, US Sansby, Errotic/Errorlust, some Fell Poth, and Doomfanger, among other things.

    Warnings in every chapter if they're needed
    A few of these are 16+.

    Series
    Language:
    English
    Words:
    87,284
    Chapters:
    56/?
    Comments:
    162
    Kudos:
    186
    Bookmarks:
    24
    Hits:
    4910
  5. Tags
    Summary

    Razz, the heir of the Beobyrian Empire, is on his way home from a diplomatic mission as his ship gets attacked by pirates. Suddenly he finds himself taken as hostage, and it doesn't seem like the pirates are planning to exchange him for a ransom anytime soon.
    How annoying.

    Language:
    English
    Words:
    5,001
    Chapters:
    2/?
    Comments:
    3
    Kudos:
    14
    Bookmarks:
    2
    Hits:
    130
  6. Tags
    Series
    Language:
    English
    Words:
    33
    Chapters:
    1/1
    Hits:
    7
  7. Tags
    Summary

    quizás cambie el titulo, quien sabe, yo no

    Series
    Language:
    Español
    Words:
    29
    Chapters:
    1/1
    Hits:
    2
  8. Tags
    Summary

    Tired of seeing his children suffer in underfell Gaster does something cruel to the swap bros.

    The swap brother's now find themselves thrown into a world of kill or be killed with their dark copies watching their every move. It unsure if they are friends or foe.

    Language:
    English
    Words:
    16,591
    Chapters:
    7/?
    Kudos:
    35
    Bookmarks:
    1
    Hits:
    334
  9. Tags
    Summary

    31 days of Kinktober prompts featuring different AU flavors of Papby and Papysansby!

    Language:
    English
    Words:
    21,145
    Chapters:
    18/31
    Collections:
    1
    Comments:
    84
    Kudos:
    71
    Bookmarks:
    11
    Hits:
    1964
  10. Tags
    Summary

    In which I fill out 31 days of fluffy prompts as found here: https://redkammy.tumblr.com/post/165865639432/october-fluff-list

    This will focus on Sansby and more specifically Underfell Sansby because it lacks in fluff.

    Language:
    English
    Words:
    9,136
    Chapters:
    17/31
    Comments:
    53
    Kudos:
    77
    Bookmarks:
    8
    Hits:
    862
  11. Tags
    Summary

    Life was good on the Isle of Monsters, which leaves a small skeletal judge at a disadvantage when he wakes in the large and dangerous Void. With no knowledge of the Void or other universes at all, he has to rely on the kindness of strangers to survive. But the Void is full of strange kinds indeed. Perhaps they are in need of his help as much as he needs theirs.

    The first being a huge version of a certain familiar blue parka wearing skeleton.

    This is a RP log of Tooth and mine in his Void AU. It became such an epic roleplay that we felt it needed to be shared. I post random aesthetic stuff on https://yarnusthegreat.tumblr.com/ Sometimes spoilers too :33 Asks are open and welcome.

    Language:
    English
    Words:
    183,544
    Chapters:
    52/?
    Comments:
    90
    Kudos:
    34
    Bookmarks:
    2
    Hits:
    1720
  12. Tags
    Summary

    Horrortober prompts from Tumblr, some days have more than one chapter, some have only one.

    But all are spooky in some way.

    Language:
    English
    Words:
    14,714
    Chapters:
    21/?
    Comments:
    2
    Kudos:
    4
    Hits:
    32
  13. Tags
    Summary

    No tienes idea lo difícil que es ser yo.
    Nunca te has preocupado por mí.
    Nunca nadie me quiso realmente.
    ¿Así que para qué mentir?
    Tengo miedo, sí.
    Pero ¿A quién le importa?

    Language:
    Español
    Words:
    1,002
    Chapters:
    1/1
    Hits:
    7
  14. Tags
    Summary

    Maybe Stretch should have known one day Blue would snap...

    A jovial get-together turns sour when news reaches the skeletons of Razz's dissappearance.

    It's like he just vanished. And Slim won't rest until his brother is found.

    Meanwhile, Blue is getting just what he's always wanted. So what if a few strings have to be pulled to keep it?

    (So I finally fixed the summary.)

    (Warning for absolute garbage in the first chapter.)

    Language:
    English
    Words:
    9,855
    Chapters:
    21/?
    Comments:
    124
    Kudos:
    69
    Bookmarks:
    10
    Hits:
    1680
  15. Tags
    Summary

    So two lovers in the bedroom, one is teasing the other with soft touches.
    The rules are simple, one is bound up and has to be dealt with, but this go around, Red is the one with his hands bound. Break the rules and the game ends.

    Language:
    English
    Words:
    2,199
    Chapters:
    2/2
    Comments:
    2
    Kudos:
    12
    Hits:
    219
  16. Tags
    Summary

    Oh golly gee, are you ready for this? This is Not Your Doll - Underfell AU edition! Here I will be taking my story chapter by chapter and inserting in everyone's favourite edgy monster cast into it.

    One cold winter day, you accidently run face first into the cement ribs of a dangerous skeleton monster. And feeling both annoyed and brave, you accidently threaten to dust him. Feeling marked, you then you run into him again. And again. And, honestly, you're not quite sure why he hasn't just killed you yet. Is he toying with you?

    This will also serve as a request fic! At the bottom of some chapters I will take a poll for some decision to be made about the story's progression. Sometimes it will be hidden, though, for something that has NOT happened in the canon core timeline :) Enjoy!

    Language:
    English
    Words:
    131,637
    Chapters:
    79/?
    Collections:
    2
    Comments:
    3736
    Kudos:
    3256
    Bookmarks:
    335
    Hits:
    61346
  17. Tags
    Summary

    He was broken and had very little hope that he could be anything else.
    He was ready for it all to end, for it all to stop and not restart.
    He was ready to die...
    But something, someone wouldn't let him.
    And he was sure he had fallen for them.

    Language:
    English
    Words:
    6,798
    Chapters:
    5/?
    Comments:
    4
    Kudos:
    43
    Bookmarks:
    10
    Hits:
    479
  18. Tags
    Summary

    “But first,” said Fell, “we need to lay down some rules.”
    Number one: No telling our brothers
    Number two: No sleeping in the same bed
    Number three: Absolutely NO getting attached

    Fell and Swap decide to embark on a casual relationship. No feelings. No attachment. Just sex. As long as they stick to the rules they should be fine… right?

    Language:
    English
    Words:
    5,485
    Chapters:
    1/?
    Comments:
    12
    Kudos:
    23
    Bookmarks:
    5
    Hits:
    164
  19. Tags
    Summary

    Memories are always coming and going, even the most important memories. With a forgotten memory also goes an important promise you made all those years ago while at the mouth of a cave. You were just a child clutching a flower crown with such devotion you couldn't have possibly known what would become of you because of that promise you made.

    And even if you've forgotten about it, there is someone who will make sure you'll be keeping it.

    Language:
    English
    Words:
    7,686
    Chapters:
    3/?
    Comments:
    7
    Kudos:
    55
    Bookmarks:
    9
    Hits:
    345
  20. Tags
    Summary

    The title and tags are pretty self-explanatory.

    Every day of October there will be an update, each chapter will be based on the kink of the day with a different pairing. There are a variety of readers and a variety of monster partners. More info will be provided in the notes for each chapter. Last two days will be Reader's choice that is decided through a month-long raffle.

    Happy Sinning!

    Series
    Language:
    English
    Words:
    23,530
    Chapters:
    18/32
    Comments:
    90
    Kudos:
    256
    Bookmarks:
    35
    Hits:
    15758

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