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  1. *

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    Sometimes, you liked to imagine that Frisk was this kind and sweet because of you.
    That, maybe, you had lived up to your promise of being the best sister you could be when they were first born.
    That you taking the brunt force of your abusive father’s hits and drunk mother’s curses was worth it.

    You had protected them from the reality of your family and… you knew that you had to protect them now.

    You were Determined… To stay Kind.

    Language:
    English
    Words:
    241,088
    Chapters:
    48/?
    Comments:
    461
    Kudos:
    1,821
    Bookmarks:
    350
    Hits:
    43,674
  2. 31

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    Based on Handplates by Zarla on Devientart. Also posted on FF.net

    What would happen if Frisk where also a creation of Gaster?

    They where just things. They were not supposed to be sentient. They weren't supposed to be kind, or care for eachother. Especially not the human. But they where. They loved eachother, cared for eachother, and so badly wanted the pain to stop. And he wanted to stop hurting them, sometimes. But he would continue to do what was necessary.

    Even though 1-S made him proud so many times

    Even though 2-P never stoped believing in him

    Even though 3-F somehow wormed her way into his heart, despite being human.

    Language:
    English
    Words:
    23,222
    Chapters:
    7/?
    Comments:
    35
    Kudos:
    284
    Bookmarks:
    31
    Hits:
    4,633
  3. 16

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    "Into the darkness they go, the wise and the lovely," ~Edna St. Vincent Millay

    When Sans finally had the rare pleasure of personally meeting Dr. Wing Ding Gaster, he could have sworn that he had met him before.

    (Or, in which Gaster doesn't take 'no' for an answer, and often takes matters into his own hands).

    Series
    Language:
    English
    Words:
    3,183
    Chapters:
    1/1
    Comments:
    8
    Kudos:
    99
    Bookmarks:
    16
    Hits:
    1,307
  4. 37

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    (Y\N) is a young female spy and soldier fighting in the War of Humans and Monsters. She is fighting on the humans' side of the war until a turn of events when she becomes apprehended by the enemy. What will happen when a young monster scientist tries to change her views?

    Language:
    English
    Words:
    81,254
    Chapters:
    25/?
    Comments:
    88
    Kudos:
    240
    Bookmarks:
    37
    Hits:
    5,959
  5. *

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    You were a normal human. You went to college, you had a life, friends, family, etc. Apparently, the void didn’t care much for happy endings, and you find yourself strapped to a table in an underground lab.

    It’s fine, you have plot armor.

    ———————————

    Or, you get sucked into the void and your soul is placed in the body of eight-year-old Sans.

    Arc 1: Heritage (1-7)
    Arc 2: Hell (8-10)
    Arc 3: Home (11-45)
    Arc 4: Heart (46-59)
    Arc 5: Hostage (60-?)

    Series
    Language:
    English
    Words:
    213,674
    Chapters:
    71/?
    Collections:
    5
    Comments:
    1,984
    Kudos:
    1,603
    Bookmarks:
    316
    Hits:
    50,801
  6. *

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    When you were born fate said 'fuck it' and decided to have some fun at your expense.

    It's hard enough trying to pass yourself off as a beta to live a somewhat normal life and keep your 'talents' secret at the same time.

    Now monsters are free, you have a hoard of skeletons that won't leave you alone AND soulmates are a thing!? Have fun with that, you're going to need all the luck you can get.

    Language:
    English
    Words:
    20,536
    Chapters:
    11/?
    Comments:
    134
    Kudos:
    763
    Bookmarks:
    228
    Hits:
    11,753
  7. 4

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    After falling into the Underground, you find that you don't have what it takes to break the barrier. You and everyone else are thoroughly disappointed. Things are rough at first, but you slowly adjust and accept that your new life will be among Monster-folk. You work through your trials and tribulations in the Underground, make new friends, even land yourself a job, and... fall in love with a certain skeleton? How charming.

    ____

    Sorry for the really vague description, this is my first fanfic 3
    So.. I hope it's bearable and that maybe someone will enjoy it !

    Language:
    English
    Words:
    16,405
    Chapters:
    4/?
    Kudos:
    7
    Bookmarks:
    4
    Hits:
    120
  8. 13

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    The barrier has been broken, monsters are free, and life is good for a human boy and his adopted mother. So why is Frisk poring through every book he can find about monster history? And why does he keep returning to Mount Ebott time and time again?

    After all, the underground is empty now. Isn't it?

    Series
    Language:
    English
    Words:
    85,131
    Chapters:
    27/27
    Collections:
    1
    Comments:
    104
    Kudos:
    185
    Bookmarks:
    13
    Hits:
    7,571
  9. 1

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    Entry Number 10:
    I should’ve expected this would happen. Much like the specimen that received the irregular solution, I feel strange. My body temperature is slowly rising, and I ache all over. Typing this entry is already difficult from the tremors in my hands. I believe that despite the increase in magic, it doesn’t affect the magic relating to bullets and damage. I’m not entirely sure what the solution is targeting, but the heat is getting unbearable. I need a cigarette…
    - - - - - -
    Before the brothers, Gaster had a different approach to breaking the barrier.

    What happens when you don’t perform your experiments carefully and test them carelessly on yourself

    Language:
    English
    Words:
    6,179
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    7
    Bookmarks:
    1
    Hits:
    85
  10. *

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    A night out with your roommates' sorority sounded like a good way to wind down from exams season, but your good intentions to keep from ruining someone's nice carpet have you end up in the middle of the forest. In the middle of the night. Very, very drunk.

    Good thing you found a random house to sidle up to and ask to use their phone. Less of a good thing that the skeleton monster that lives in it is only placated by your sloppy jokes.

    -

    Eventually going to culminate in a "Six Skeletons" sort of set-up, but you don't get off as easy by knowing Classic Sans first.

    Language:
    English
    Words:
    173,962
    Chapters:
    37/?
    Comments:
    2,450
    Kudos:
    6,957
    Bookmarks:
    1,589
    Hits:
    196,980
  11. *

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    When Frisk finished her story, barrier broken and monsters freed, she knew there was still a loose end, but she never expected everything to come unraveled before her eyes. Determined to save the only family she’s ever known, Frisk must stitch their lives back together after they are ripped apart at the seams and then attempt the impossible to stop it from ever happening again.

    [A story like this has been told before, in many different ways by many different people. Even so, I hope you enjoy it. Please know all major canon timelines and the music of Undertale before reading for the best experience.]

    [An AU of what happens after a specific time kid's True Pacifist ending.]

    Series
    Language:
    English
    Words:
    733,921
    Chapters:
    85/85
    Collections:
    1
    Comments:
    490
    Kudos:
    853
    Bookmarks:
    115
    Hits:
    48,663
  12. 34

    Summary

    The lockets they wear may be delicate, but the bonds of loyalty and love they represent between a monster prince and his human sister are unbreakable.

    Words:
    143,253
    Works:
    9
    Bookmarks:
    34
  13. 6

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    Sans mistakes an orange glow in the forest for a human soul...
    Shenanigans ensue; pun are learned... so many puns...

     

    This is just a collection of Grillby and Sans being friends as kids and staying friends as they grow.
    Grillby and Gaster do mostly talk in sign language, but I don't know sign language myself so I may include words that do not exist in sign language, but I am trying my best. Stuff said in sign language will be in italics because I find it a bit easier myself.
    More tags may or may not be added.

    Language:
    English
    Words:
    1,424
    Chapters:
    1/?
    Comments:
    3
    Kudos:
    32
    Bookmarks:
    6
    Hits:
    213
  14. *

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    Alphys creates a machine that can display a monsters memories and invites Sans, Papyrus, Undyne, Toriel, and Frisk to help test it out. Sans is suspicious but agrees to help. His suspicions turn out to be well founded when something goes wrong and they have no way to stop the test. To make matters worse the one person who didn't want his memories shown is having them played like a movie. Now the group is forced watching Sans' most important memories to the end but maybe it could be fate. Sans has been secretive far too long or are somethings better left forgotten.

    (No update schedule set)

    Language:
    English
    Words:
    81,660
    Chapters:
    44/50
    Comments:
    440
    Kudos:
    1,921
    Bookmarks:
    289
    Hits:
    48,605
  15. 12

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    Summary

    Turning my childhood trauma into oneshots as a twisted, unhealthy coping mechanism. Mind the tags and chapter summaries.
    Note: I do not condone, support, or encourage any of what will be featured is this fic. I'm literally making this as a way to cope with shit that happened to me in my past.

    Edit: More consensual/self-indulgent works will now be posted in my Oneshots: Wholesome(ish) Edition work

    Series
    Language:
    English
    Words:
    7,633
    Chapters:
    4/?
    Comments:
    26
    Kudos:
    188
    Bookmarks:
    12
    Hits:
    11,073
  16. 4

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    Just when he's lost everything, Spamton G. Spamton is approached by a stranger in a dark suit. They offer him a deal: spy on the Knight, and he'll want for nothing. The answer is obvious. However, once that can of worms has been opened, there's nothing Spamton can do to stop the chaos that follows.

    This is a Spamtenna novel that follows the series of events occuring before the main gameplay in Deltarune, focusing on who W.D Gaster is and Dess's motivations as the Knight. Tenna and Spamton are both bound by contracts to serve as their proxies, but what happens when their relationship causes them to violate their deals?

    (Description subject to change)

    Language:
    English
    Words:
    11,517
    Chapters:
    6/?
    Comments:
    15
    Kudos:
    14
    Bookmarks:
    4
    Hits:
    298
  17. *

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    Summary

    DARK

    DARKER

    YET DARKER

    THE DARKNESS KEEPS GROWING

    ...

    You never believed in the supernatural, even after monsters escaped the Underground and magic was revealed to the world. But strange, inexplicable occurrences keep happening at your apartment, your dreams filled with visions of a peculiar grey door.

    Not to mention your weird neighbors and their shenanigans; A pair of skeleton brothers, a talking houseplant, and the quiet kid living with them.

    Perhaps that terrifying, short skeleton knows more than he lets on...

     

    Series
    Language:
    English
    Words:
    146,429
    Chapters:
    31/31
    Collections:
    2
    Comments:
    828
    Kudos:
    1,047
    Bookmarks:
    206
    Hits:
    28,965
  18. *

    Summary

    Undertale Multiverse where the Sanses know each other, but with wings. Wings are an extension of a monster’s soul and are typically used as a form of expression or fighting.

    Some of the AUs will not have wings, though, since they are technically alternate universes and can be made without them.

    Series will consist of (probably) one-shots surrounding the characters, and I’ll probably take suggestions after the first two stories are done. Just because I make a character or relationship one way doesn’t necessarily mean I won’t write something else entirely if I like it, it just won’t be “canon” to the series.
    (〜 ̄▽ ̄)〜

    Words:
    129,084
    Works:
    10
    Bookmarks:
    295
  19. 16

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    Lyra, a devoted Undertale fan, decides to play god by rewriting the game's code to grant Asriel Dreemurr the happy ending he deserves. But when her actions pull her into the Underground itself, she finds herself trapped in the very world she tried to control.

    !!!!This story contains graphic descriptions of violence, body horror, and themes of grief, trauma, suicide, and manipulation aaaand a lot more. While it may seem fluffy at first, darker themes emerge as the story progresses. There are still plenty of warm, comforting moments, but I don’t want to mislead anyone expecting a purely lighthearted tale!!!!

    Also, this is very slowburn — Chara’s and the MC’s relationship progresses slower than you might expect. If you find yourself feeling frustrated with how I write Chara early on, please know it’s intentional and part of the slow build. Thanks for giving it a chance! <3

    !!Currently editing. The story itself won’t change, just fixing details!!

    Language:
    English
    Words:
    98,678
    Chapters:
    35/35
    Collections:
    1
    Comments:
    188
    Kudos:
    139
    Bookmarks:
    16
    Hits:
    3,924
  20. 45

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    Written for the "Cheer Up The Skeleton" week on tumblr, Day 6 - prompt "the machine is fixed".

    Sometimes, there really is a happier ending. All you need is a little bit more help. Sans figures out how to ask for it, his friends figure out how to provide, and together, the achieve the impossible. There's always room on the surface for a few more lost souls.

    Series
    Language:
    English
    Words:
    3,013
    Chapters:
    1/1
    Comments:
    4
    Kudos:
    299
    Bookmarks:
    45
    Hits:
    2,746

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