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  1. Tags
    Summary

    Failure. Reset. Failure. Reset. Failure. Reset.

    This time, you fall into the Underground weeks before the 'Eighth' Human child arrives. But you’re not a child. And not many monsters expected to see an adult human in the Underground... not even Sans. You definitely aren’t supposed to be here.... or maybe you are? Maybe you’re the anomaly that can finally stop this endless cycle of resets?

    Or maybe you'll just get stuck in it with the rest of them.

     

    The “reader” is technically a young adult (twenties), female OC whose story is told through the second person. This was done to keep the story's POV similar to the game's POV.

    Language:
    English
    Words:
    18,461
    Chapters:
    10/?
    Collections:
    4
    Comments:
    74
    Kudos:
    255
    Bookmarks:
    47
    Hits:
    1989
  2. Tags
    Summary

    Inspired by Lady Darkina's 'Between Flesh and Bone', and other reader insert/OC insert Undertale fanfictions:
    This story follows Sans the skeleton (a lazy yet respectable skelly monster) and his new-found crush (we'll get to names, later), after Frisk's Pacifist Run when they're on the Surface. Leaving the Underground is a huge deal...especially with all those little details Sans had to deal with at one time (and the legal drama, too). PTSD is real, my bros...and this is how YOU help him deal with it.

    Enjoy!

    Language:
    English
    Words:
    394
    Chapters:
    1/?
    Comments:
    1
    Kudos:
    5
    Hits:
    74
  3. Tags
    Summary

    You and your life long friend Rosie are taking Frisk on a camping trip over the weekend on Mt. Ebott for Frisk's birthday when a large hole is discovered and you all fall in. And what do you mean Rosie isn't what she seems to be?

    ~~~~
    Come join the fun as 3 friends traverse the Underground trying to find their way home.

    Series
    Language:
    English
    Words:
    29,856
    Chapters:
    12/?
    Comments:
    13
    Kudos:
    26
    Bookmarks:
    4
    Hits:
    649
  4. Tags
    Summary

    All the main characters have a big orgy featuring sans the skeleton who makes 13 year olds horny

    Series
    Language:
    English
    Words:
    280
    Chapters:
    1/1
    Comments:
    11
    Kudos:
    28
    Hits:
    1712
  5. Tags
    Summary

    You're a prostitute working under a ruthless pimp who constantly threatens your life if you don't make enough money. That is until one day, Mettaton finds out and gets you out of the ditch you've dug yourself in. You soon meet the monster everyone's talking about: Sans. But will this be the chance to turn your life around or will you be thrown into prostitution again?

    Language:
    English
    Words:
    18,417
    Chapters:
    9/?
    Comments:
    114
    Kudos:
    303
    Bookmarks:
    52
    Hits:
    4306
  6. Tags
    Summary

    *This story takes place as if Frisk played through the pacifist neutral ending. The souls are gone, Asgore is dead, Toriel is queen, and Alphys is researching a way to get above ground. They assume, after three years, that Frisk is dead.
    You, being the first human to enter the Underground since Toriel instated that humans are welcome, are asked to participate in some research, so as to better understand humans. But perhaps there are other reasons?
    *There will be spoilers, and Flowey. Despite my original intentions, there will eventually be NSFW, but it will be skippable, for those of you who don't enjoy that kind of thing.
    *There will be between 40 and 45 chapters.
    *Reader character’s appearance is never outright described, and uses gender-neutral pronouns. Has breasts and uterus, but may or may not bind. Reader character is an adult, and is not Frisk. Tags will be updated as story continues. Please be kind to me, this is my first attempt at fanfiction.

    Series
    Language:
    English
    Words:
    264,269
    Chapters:
    42/42
    Comments:
    866
    Kudos:
    463
    Bookmarks:
    111
    Hits:
    10369
  7. Tags
    Summary

    A typical night shift at the bar ends with bruised knuckles, a bloody face, and a drunk man sent t the doctors with a fractured jaw. The entire world is turned on it's head however when a huge black hole decides to eat me alive and spit me out into a world I can only describe as crazy. I now work at Grillby's bar and know just about everyone in Snowdin and Waterfall, but then my life is once again disturbed when a kid saunters into the bar with dust in their sweater and Sans by their side. I might be just a mixer by trade, but I'm an Italian, and I can and will fight any bastard who crosses me. And if that kid messes with me, then they're messin' with the mafia.

    Language:
    English
    Words:
    8,259
    Chapters:
    7/?
    Comments:
    9
    Kudos:
    58
    Bookmarks:
    9
    Hits:
    522
  8. Tags
    Summary

    Sans seems rather depressed--you're there to help him cheer up a little.

    Language:
    English
    Words:
    1,499
    Chapters:
    1/1
    Kudos:
    81
    Bookmarks:
    2
    Hits:
    851
  9. Tags
    Summary

    To be based on Sans and Frisk in the genocide run except... Frisk killed no one and Sans... well Sans is now driven insane by the power of cannibalism.

    Language:
    English
    Words:
    2,137
    Chapters:
    2/?
    Comments:
    7
    Kudos:
    38
    Bookmarks:
    1
    Hits:
    625
  10. Tags
    Summary

    Slowly, you bring a hand up to your face and notice it’s flowers. And not just any flowers, the wild buttercups that grow all over the mountainside. You had managed to do a face-plant of epic proportions into a bed of buttercups. You huff, sending the flowers swaying around your face before closing your eyes again.

    It takes a while, but even slower then before, you roll yourself to your back. Just that much winds you and you end up panting from the effort. As you try to catch your breath you open your eyes and squint, blinking up at the perfect circle of light above you.

    Then it hits you.

    Dear God. Had you really fallen that far?

    ___________________________________________________________________________________________________________________________________________________________________________________

    A spiritual revamp of my old story And Again. Will update at least once a week.

    Language:
    English
    Words:
    6,819
    Chapters:
    4/?
    Comments:
    3
    Kudos:
    46
    Bookmarks:
    12
    Hits:
    618
  11. Tags
    Summary

    A prequel to the story "Above Ground", depicting the readers journey through the underground.

    Mercy run, reader is not Frisk. Reader has no gender, please let me know if I mess that up anywhere in the fanfic! No nsfw, except for violence during battles.

    To read Above Ground: http://archiveofourown.org/works/5216162/chapters/12026318

    Language:
    English
    Words:
    8,464
    Chapters:
    3/?
    Comments:
    7
    Kudos:
    24
    Bookmarks:
    2
    Hits:
    181
  12. Tags
    Summary

    Faith fell down into the toxic wasteland of the underground, to be saved by Flowey on there journey through the underground they loose hope to be save by Sans. Do they continue on there way of do they give up.

    Language:
    English
    Words:
    4,420
    Chapters:
    3/?
    Comments:
    2
    Kudos:
    5
    Hits:
    94
  13. Tags
    Summary

    It's been six years since I left, but I can't stay up here any longer. I am not going to let her grow up here with how horrible the people are. I don't care if I can't come back to the surface. I want to go home.

    Language:
    English
    Words:
    33,286
    Chapters:
    60/?
    Comments:
    143
    Kudos:
    420
    Bookmarks:
    36
    Hits:
    7392
  14. Tags
    Summary

    Have you ever wondered what would've happened, if a character from a game jumped universes on accident? What if said character turned into a little being that could be compared to be the size of a human hand at most?
    Find out how Sans survives through the hardships of being only 7" high and at mercy of a human girl. Will he trust her enough to let her help him? What exactly happened to him in the first place? What about the universe that he left behind?

    Language:
    English
    Words:
    10,390
    Chapters:
    3/?
    Comments:
    23
    Kudos:
    130
    Bookmarks:
    17
    Hits:
    1680
  15. Tags
    Summary

    This story is also on my wattpad and quotev. (I'm not sure about deviantart and/or Tumblr, I forgot
    ^-^')

    He looked at you, hands in pockets. "resetting again, i assume? actually, why do i assume? of course you do." You roll your eyes, "What does it matter to you?"

    Sans narrowed his eyes. "you're lying to everyone. you're killing all your friends---no, M Y friends." "Wow, you're so sappy. I don't care who or what your friends are. They're only an obstacle in my way."

    "...You're not what you seem to be."

    -

    Story belongs to me.
    Undertale belongs to Toby Fox.
    Sans owns you ( ͡° ͜ʖ ͡°)
    Lol, just kidding, you own yourself. :)

    Language:
    English
    Words:
    331
    Chapters:
    1/1
    Comments:
    3
    Kudos:
    30
    Hits:
    670
  16. Tags
    Summary

    Sans done fucked up.

    Language:
    English
    Words:
    1,648
    Chapters:
    1/1
    Collections:
    1
    Comments:
    21
    Kudos:
    134
    Bookmarks:
    12
    Hits:
    1591
  17. Tags
    Summary

    Every timeline is linked together to form a chain. Sans tries to comprehends his life during these different timelines and understand how different situations has influenced him.

    (Prepare yourself for a journey through different Undertale AUs.)

    Language:
    English
    Words:
    5,775
    Chapters:
    17/17
    Comments:
    50
    Kudos:
    98
    Bookmarks:
    9
    Hits:
    3947
  18. Tags
    Summary

    An unusual Frisk falls into the Underground. Sans can't run from his sins. Together, they fuck shit up. *megalovania intensifies*

    Language:
    English
    Words:
    106,612
    Chapters:
    30/?
    Comments:
    222
    Kudos:
    597
    Bookmarks:
    67
    Hits:
    13258
  19. Tags
    Summary

    In a world where neither Humans nor Monsters won the war, LOVE and EXP became a means of quantifying a person’s threat level - their homicidal tendency.

    To ensure peace between the two races, anyone found with a high enough LOVE and EXP were immediately imprisoned and/or sentenced to death.

    The Humans and Monsters who enforced this new law were known as the Executors.

    Some time later, blueprints of the DT-Extractor Machine - the one created by the late Royal Scientist, W. D. Gaster - were found to had been stolen. A new black market business appeared: Liquid Determination (LD) and Liquid Mana (LM) Extraction - they became a new currency of the black market.

    Amidst all of this, Resets were still occurring and the only ones who remember anything about the past timelines at all were Frisk and Sans. Reset after Reset, hardly anything ever changed in every timeline until-

    -one day, Sans met a human who had an unreadable LOVE and EXP.

    // Status: Discontinued //

    Language:
    English
    Words:
    42,722
    Chapters:
    12/?
    Comments:
    61
    Kudos:
    202
    Bookmarks:
    20
    Hits:
    2748
  20. Tags
    Summary

    You've made a name for yourself, singing nights in a run-down club that's popular with monster mob grunts. The bar is usually considered too risky to attract the higher-ups. Tonight is different.

    Language:
    English
    Words:
    3,773
    Chapters:
    1/1
    Comments:
    28
    Kudos:
    411
    Bookmarks:
    67
    Hits:
    5338

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