1 - 20 of 3079 Works in Alternate Universe - Underfell (Undertale)

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  1. Tags
    Summary

    There is only so much pressure one can take before they crack. Sans hit his limit long before Frisk came crashing into his life like a brick, and everything started falling to pieces. He just didn’t know it yet.

    HwC Pre-Sequel | 100 Word Drabbles | Sans’ Backstory

    Series
    Language:
    English
    Words:
    21,900
    Chapters:
    219/?
    Comments:
    1262
    Kudos:
    197
    Bookmarks:
    12
    Hits:
    7510
  2. Tags
    Summary

    You find yourself out of a job, on the verge of getting kicked out of your apartment because you can't pay the rent and no where to go. Until your newest skeleton friend suggests you move in with them and their cousins until you get back on your feet again. You didn't expect to like living with this many people at once so much though...

    Language:
    English
    Words:
    189,752
    Chapters:
    45/?
    Comments:
    1017
    Kudos:
    2209
    Bookmarks:
    385
    Hits:
    41213
  3. Tags
    Summary

    The first time you met monsters you manage to run into four of them and literally run into one of those four. Now they are apparently moving in next door with their siblings and you can't seem to imagine a life without monsters. On the plus side they tell horrible jokes and have endless amounts of energy. So what could possibly go wrong.

    Language:
    English
    Words:
    225,721
    Chapters:
    54/?
    Comments:
    1573
    Kudos:
    3171
    Bookmarks:
    477
    Hits:
    68372
  4. Tags
    Summary

    Tragedy suddenly struck the famous Diamond Rose Theater when their lead actor is found dead below the platform during a performance. It appears they had fallen from the platform and died on impact. Yet despite how it appears to be an accident, something doesn’t seem right. Sheriff Dust cashes in a favor from his old friend Detective Horror to help him crack the case. As Horror begins to uncover more secrets, he finds that there is more to the Diamond Rose Theater then it seems.

    Language:
    English
    Words:
    14,392
    Chapters:
    12/?
    Comments:
    30
    Kudos:
    10
    Bookmarks:
    2
    Hits:
    253
  5. Tags
    Summary

    A tale of the past, a tale of the present, both intertwined to tell the tale of two brothers.

    A dadby babybones fic set in Underfell, of all places.

    Language:
    English
    Words:
    11,124
    Chapters:
    12/?
    Comments:
    114
    Kudos:
    349
    Bookmarks:
    57
    Hits:
    3581
  6. Tags
    Summary

    Have some Error Oneshots to either warm your heart and make you smile or clench your SOUL and make you cry!
    Sub!Error x Anyone

    Latest Update: For Your Own Good (Fallacy x Error x Encre) [Part 3]
    Error fell into Vampireverse when Ink accidentally opened a portal under him to the Void in the midst of their battle. Error seems to have caught the attention of Encre; later, Fallacy.

    (AUs or characters doesn't belong to me unless I said so. Undertale belongs to the one and only Toby Fox, and it's AUs belongs to their wonderful creators out there. I only own the story and the plot. The characters' characteristics will change and be altered for the sake of each and every story.)

    Language:
    English
    Words:
    60,988
    Chapters:
    31/?
    Comments:
    150
    Kudos:
    493
    Bookmarks:
    51
    Hits:
    13403
  7. Tags
    Summary

    The city of Ebott was not one many humans resided in. It belonged solely to the Monsters, and was known as the Underground. The Dreemurr family had overseen the running of their cartel for decades, building themselves up as a fearsome group. There weren't many human families that even came close to the power and wealth they held, nor the formidable soldiers. Namely their two best hit-men; The Judge and The Executioner, known affectionately to most as the 'Bone Brothers'.

    Of course, many had tried and subsequently failed to stake claim to the long held throne. Things like that were usually swept under the rug fairly easily, but something about these latest challengers..

    Series
    Language:
    English
    Words:
    59,189
    Chapters:
    14/?
    Comments:
    75
    Kudos:
    348
    Bookmarks:
    81
    Hits:
    4290
  8. Tags
    Summary

    This is a self-insert of the Undertale AU. Due to creator's wishes, no nsfw will be written but future fluff will emerge.

    All ships are written as 18+

    The reader is a companion to Frisk, protecting them throughout the journey that is Undertale. The story follows their quest as they try not to kill or be killed.

    Language:
    English
    Words:
    22,279
    Chapters:
    9/?
    Comments:
    65
    Kudos:
    539
    Bookmarks:
    59
    Hits:
    11504
  9. Tags
    Summary

    Black and Mutt have a new pet human. But she has powerful family and heaven help those who mess with the De la Cours.

    Language:
    English
    Words:
    662
    Chapters:
    1/?
    Comments:
    1
    Kudos:
    3
    Bookmarks:
    1
    Hits:
    15
  10. Tags
    Summary

    I sometimes cannot focus on big projects. So here's small Undertale stuff that's self contained and short."Ficlets" as the cool kids call them. Ones that are NSFW will be tagged in the Chapter titles, as for the general theme. I will add more tags as I add more. :)

    Language:
    English
    Words:
    596
    Chapters:
    3/?
    Comments:
    2
    Kudos:
    1
    Hits:
    34
  11. Tags
    Summary

    You the reader are about to go on an adventure to the underground. You don’t necessarily have a good home life but even so you weren’t expecting what happens to actually change it so drastically! When you come out the other side you weren’t expecting to wake up after your harrowing escape, in the Gaster Brothers home.

    Language:
    English
    Words:
    28,535
    Chapters:
    7/7
    Comments:
    26
    Kudos:
    79
    Bookmarks:
    20
    Hits:
    1800
  12. Tags
    Summary

    A housing/roommate arrangement was made. A human stays with them until repairs in their apartment are done, and they get half a year's rent waived for taking the human in. Now if only Papyrus had told him prior, and not the day of the human moving in with them.

    Language:
    English
    Words:
    2,460
    Chapters:
    2/?
    Comments:
    4
    Kudos:
    5
    Hits:
    48
  13. Tags
    Summary

    You (a recently separated parent), find yourself being trained under MTT Resorts as one of the first Human Monster food chefs. Your best friend is a singing angler fish, and your talent judges are skeletons. Some of which dont trust you, and some want to be more than friends.

    Language:
    English
    Words:
    5,800
    Chapters:
    2/?
    Comments:
    28
    Kudos:
    39
    Bookmarks:
    10
    Hits:
    358
  14. Tags
    Summary

    A collection drabbles requested from Tumblr and Ao3 comments. NSFW requests will have an addition to the title and a note at the beginning of the chapter for those who would prefer to avoid them. Content will be tagged by chapter.
    My Tumblr: vex-bittys

    Language:
    English
    Words:
    7,818
    Chapters:
    9/?
    Comments:
    69
    Kudos:
    110
    Bookmarks:
    14
    Hits:
    2095
  15. Tags
    Summary

    After Sans had the genius idea to mess with a machine he had created, he didn't expect that it would have brought versions of himself and his two brothers (Papyrus and Wingdings Gaster) to their universe. Nor did he expect that an old friend of his would introduce him to none other than his soulmate, or that his very soulmate was also his brother's and alternate versions' also.

    Language:
    English
    Words:
    35,551
    Chapters:
    12/?
    Comments:
    92
    Kudos:
    108
    Bookmarks:
    31
    Hits:
    1593
  16. Tags
    Summary

    Red moves back home with his tiny tot of a son, owning a book shop and expecting just the normal ins and outs of every day life. An out of towner comes in, and Red only expected a little flirting, maybe some teasing but not a sudden and swift change to everything he's ever known in his life!

    (Based on all Hallmark movies everywhere)

    Series
    Language:
    English
    Words:
    29,536
    Chapters:
    16/?
    Comments:
    218
    Kudos:
    108
    Bookmarks:
    22
    Hits:
    1736
  17. Tags
    Summary

    The Underground is a dangerous place. You don't belong here - soft and sweet as you are - but it's not like you can go back. At least you're relatively safe, thanks to a certain skeleton you happened to meet once you escaped the Ruins. It seems like he and his brother have plans for you...

    Low on plot, high on fluff and humor. Rated T due to language and suggestive themes. NO SMUT.

    Language:
    English
    Words:
    5,185
    Chapters:
    2/26
    Comments:
    6
    Kudos:
    27
    Bookmarks:
    5
    Hits:
    188
  18. Tags
    Summary

    A mostly Sans-centric, NSFW collection of drabbles from over on my tumblr. Multiple pairings, lots of AUs, kinks abound!

    Language:
    English
    Words:
    38,183
    Chapters:
    44/?
    Comments:
    151
    Kudos:
    663
    Bookmarks:
    71
    Hits:
    17162
  19. Tags
    Summary

    A hundred years after the X Event, and The Omega Timeline is now the heart of the multiverse. The main goal of the place? To ensure that Error never steps foot inside the timeline, or harms anyone living there.

    However, when Error is discovered in the timeline, he is promptly captured, muzzled like a wild animal, and taken to be euthanized. Things start to spiral out of control, and Ink, the once benevolent protector, grows more and more distant. Soon no one is safe, and Error’s life hangs in the balance between those who wish him a tormented existence, and those whose motives are unknown.

    (Feat. Gradient, making extremely poor decisions.)

     

     

    (((Illustrations by Shimokomoriya on DeviantArt. Check them out!!)))
    (((Edited by ShandyCandy278 who is Super Cool™)))

    Language:
    English
    Words:
    109,780
    Chapters:
    21/?
    Comments:
    1581
    Kudos:
    1101
    Bookmarks:
    120
    Hits:
    16492
  20. Tags
    Summary

    You are a lost black cat trying to go home.

    The cold streets are horrible place for a home Kitty cat like you withno 'survival tacttics' it all.

    Hope, thats the thing that weird cat help you keep after appearing from darknees itself.

    "Safety" he promised in change of helping his kittens.

    Language:
    English
    Words:
    16,625
    Chapters:
    6/?
    Comments:
    18
    Kudos:
    35
    Bookmarks:
    6
    Hits:
    752

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