1 - 20 of 6534 Works in Sans (Undertale)/Reader

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  1. Tags
    Summary

    I've always been like this. Stuck in the dark only ever seeing inches of the light. Until I'm snatched away from it time and time again.

    After all I was born like this. Needing the blood and magic of other to stay alive. I do my very best to only take what I need.

    That being said I don't know what came over me when I saw the bright blue skeleton. He... He just smelled so good to the point it made my brain fuzzy.

    I swear I didn't mean to claim him.

    Language:
    English
    Words:
    8,487
    Chapters:
    7/?
    Comments:
    25
    Kudos:
    116
    Bookmarks:
    19
    Hits:
    1097
  2. Tags
    Summary

    When Sans' machine goes off in the middle of the night, you discover some surprises.

    Language:
    English
    Words:
    7,198
    Chapters:
    4/?
    Comments:
    37
    Kudos:
    182
    Bookmarks:
    31
    Hits:
    1980
  3. Tags
    Summary

    Same universe, New monster reader Protag!

    Black (FellSwap) meets his SOULmate.
    Fun, song-filled shenanigans ensue with the meddling of a dramatic Robot with a SOUL.

    Ideas initially inspired by “Skeleton Squatters and the Landlady” by Tyrant_Tortoise, “In Your Bones, Under Your Skin” by RTH, and "Winter in your Bones" by Cryptid_jack

    Series
    Language:
    English
    Words:
    29,609
    Chapters:
    8/8
    Comments:
    19
    Kudos:
    30
    Bookmarks:
    10
    Hits:
    376
  4. Tags
    Summary

    Before waking up in a bed of Golden flowers, you remember falling asleep in your bed. The scenery you see now is all to familiar, until suddenly it clicks.
    You know where you are and who these beings are… but, how did you get here?

    This world that is all to familiar to you, is now your home. It’s up to you to help the monsters and people there, but the strange machine in Sans’s garage doesn’t seem to be helping. New - or are they the same? Monsters keep appearing underground, a little too similar to the skeleton brothers that appeared recently.

    Timelines get more confusing, universes seem to collide, and magic and machines go haywire causing people to end up in worlds that are not their own. Is there a way to give everyone that happy ending they desire?

    One things for sure, falling in love was not part of the plan. But neither was traveling Universes, so what’s new?
     

    ————————————————

    I couldn’t fit all the tags a wanted, but Underfell, Underswap, SwapFell, FellSwap, Horrortale, and probably other AU Sans and Papyrus’ will show up. Some of those AU worlds will be used to. Deltarune will also make appearances and relevance to plot in much later chapters.

    Language:
    English
    Words:
    71,892
    Chapters:
    22/100
    Comments:
    157
    Kudos:
    137
    Bookmarks:
    35
    Hits:
    2639
  5. Tags
    Summary

    Somethin' somethin', toxic roommate abuses skeletons, kind reader swoops in and steals them. Except, what if the roommate wasn't toxic? What if she was an absolute sweetheart?

    Y/N wasn't sure why it happened. One day she's surviving in her broken universe alone, and the next she's living with a human girl named Emma and her boyfriends. The sweet and lovely Emma gives her the attic to stay in, and tries her best to get Y/N settled. From the hostile Black and Edge to the cheerful duo that's Creampuff and Blue. From the indifference of Stretch and Mutt to the mixed signals of Vanilla and Red. She's not sure where she fits in this house, being the only hybrid and the most recent roommate. However, things start to unravel in this already established house when the hybrid starts her heat.

    Reader does not end up in a poly situation, Horror bros maybe join the house later.

    Language:
    English
    Words:
    43,249
    Chapters:
    20/?
    Comments:
    156
    Kudos:
    214
    Bookmarks:
    35
    Hits:
    3026
  6. Tags
    Summary

    When Papyrus dies, Sans finally loses his last strain of sanity. Completely broken, and not all there in the head, Sans goes on a killing spree. Nicknamed The Butcher, the serial killer goes into peoples homes and chops off their heads and limbs.
    ‘friends for papyrus’ The deranged skeleton says. But the skeleton soon finds himself caught up in a delusion where you and him are in a relationship. A loving one at that.
    Pleased he’s finally not alone anymore, Sans does his best to provide for you and keep you in his home, all while still finding more friends for Papyrus.

    Or

    Where a deranged serial killer kidnaps you and locks you up in his house, claiming that you’re his girlfriend. Rather than being chopped into bits, you much prefer playing along to his strange fantasy.

    Language:
    English
    Words:
    7,308
    Chapters:
    6/?
    Comments:
    69
    Kudos:
    165
    Bookmarks:
    37
    Hits:
    1742
  7. Tags
    Summary

    You've always been fascinated with Error, the destroyer of AUs who began stalking you with the assumption that you're working with Ink. But his gluttony for chocolates had given you sweeter ideas on how to deal with him.

    Language:
    English
    Words:
    19,684
    Chapters:
    2/?
    Comments:
    21
    Kudos:
    95
    Bookmarks:
    28
    Hits:
    951
  8. Tags
    Summary

    [Y/N] [L/N] is a powerful mage with a bloodline well-known throughout the ages and her family have always been celebrated. They, however, despise how their bloodline trapped monsters beneath the ground. But, that is for another day. In not being able to afford basic accommodation for university, they had to rely on an old (and terrible) friend named Bethany. For some reason, most of Bethany's skeleton mates despise [Y/N] but why is that? Apart from the fact she is a mage?
    Just because she has a kindness soul, it doesn't mean she will stand for their bullshit.

    Language:
    English
    Words:
    30,846
    Chapters:
    15/?
    Comments:
    47
    Kudos:
    259
    Bookmarks:
    69
    Hits:
    6473
  9. Tags
    Summary

    A world is torn in half, blood spilt and dust spread. Y/n escapes her toxic background and travels through harsh terrains and blistering cold temperatures in hopes of finding the Monsters to help fight for their independence. Finally, it seems all her work has paid off! Unfortunately for her, she doesn't quite get the warm welcoming she was hoping for. Will the monsters accept her as one of them? Will the world ever know peace again? Is it possible for something as beautiful as love to blossom in something as destructive as war, and will Sans ever pick up his dirty sock? Y/n is uncertain but knows if she stays BRAVE in the face of danger, she can do anything.

    Language:
    English
    Words:
    68,577
    Chapters:
    17/?
    Comments:
    47
    Kudos:
    210
    Bookmarks:
    42
    Hits:
    4540
  10. Tags
    Summary

    Hello there Reader! Your name is Dee! And you have just moved back to your hometown of Ebott! Though after 17 years it sure looks different! As you return to your beloved hometown, now a capable 24 year old human being, you can't seem to shake the chill of your past and the effects it's having on your mental state. Oh! But maybe those nice skeleton monsters can help chase away those pesky memories of yours.

    *Reader is an AFAB She/Them. Not your cup of tea then move on. :)

    **Updates are ever Friday at 12PM EST!

    Language:
    English
    Words:
    19,151
    Chapters:
    5/?
    Comments:
    4
    Kudos:
    22
    Bookmarks:
    6
    Hits:
    393
  11. Tags
    Summary

    Monsters have been living on the surface now for three years and it's time for your elementary school to integrate. Though you don't begrudge the little weirdos their education, things aren't easy.

    First of all, hate groups are targeting the school left and right.

    Secondly, the new skeleton janitor is keeping a judgmental eye on you constantly.

    Third - one of the new students seems to be a human called Frisk, and you're not quite sure how they got adopted by this monster family...

    -----------
    Updates each Friday!

    Series
    Language:
    English
    Words:
    43,373
    Chapters:
    19/?
    Comments:
    114
    Kudos:
    367
    Bookmarks:
    71
    Hits:
    5968
  12. Tags
    Summary

    Life just has this way of kicking you while your down, but this time you've got enough skeletons in your closet to help you back onto your feet, so when your boyfriend cheats on you, you really don't think it can get any worse.

    ...right?

    Series
    Language:
    English
    Words:
    94,194
    Chapters:
    42/?
    Comments:
    670
    Kudos:
    1477
    Bookmarks:
    320
    Hits:
    32443
  13. Tags
    Summary

    Whenever we make a decision the universe and your destiny are divided. In another universe you have done what you have not dared to do in this one, you have said what in this one you have kept silent.
    However you have a second chance, to do everything you do not dare to do, but at what cost?

    Language:
    English
    Words:
    1,118
    Chapters:
    1/?
    Comments:
    1
    Kudos:
    3
    Bookmarks:
    1
    Hits:
    50
  14. Tags
    Summary

    Legends say never climb Mt. Ebott. Those who brave the trail are never heard from again. Well, you were never one to put much stock in a children's story, anyway. Besides, who could resist the beautiful scenery? The leaves have just turned and it's the perfect weather for camping. Frisk will probably enjoy it too.

    As luck would have it, those stories weren't just fantasy, and what should have been a tragic accident turns into a grand adventure of fallen humans, a family, and Determination.

    Welcome to the Underground.

    Entry One: Fallen Down: Learning: 1 - 18

    Entry Two: Don't Give Up: Adapting: 1 - ???

    Entry Three: Persevering: ??? - ???

    (Summery updated: November 7)

    Series
    Language:
    English
    Words:
    83,789
    Chapters:
    19/19
    Comments:
    142
    Kudos:
    293
    Bookmarks:
    57
    Hits:
    5313
  15. Tags
    Summary

    She wanted nothing more to be at peace, to be "safe" finally but she never could because her heart was too big for her own good. Gave everything to everyone until she was beyond repair...then one day, "they" found her broken.

    Language:
    English
    Words:
    9,389
    Chapters:
    6/?
    Comments:
    8
    Kudos:
    14
    Bookmarks:
    3
    Hits:
    119
  16. Tags
    Summary

    Just when you though you were finally settling into your life in the Underground, life throws you for a loop. Now there is a dead scientist who never existed inside your head, you're seeing strange Monsters that you have never seen before, and a soulless flower child is hellbent on killing you and taking your Soul.

    Sounds like a normal Monday morning. At least you have Frisk and your Monster family to support you.

    Entry One: Fallen Down: Learning: 1 - 18

    Entry Two: Don't Give Up: Adapting: 1 - ???

    Entry Three: Persevering: ??? - ???

    Series
    Language:
    English
    Words:
    2,983
    Chapters:
    1/?
    Kudos:
    2
    Bookmarks:
    2
    Hits:
    20
  17. Tags
    Summary

    Just a simple collection of Sans/Reader one-shots. Each story will differ from the other and they aren’t linked in any way.

    Language:
    English
    Words:
    8,351
    Chapters:
    10/?
    Comments:
    3
    Kudos:
    96
    Bookmarks:
    9
    Hits:
    2128
  18. Tags
    Summary

    It's been 5 year since you and your brother fell into the Underground. You had lived with Sans and Papyrus during this time. Just before you two had arrived, a human had fallen, killed the king and left with the monsters' one means of escaping, further trapping them. At first, there wasn't much except a new queen being announced. She had made it law that any human that were to fall down were to be killed on sight . Good thing you and your brother weren't human.

    Years passed and slowly everyone was running out of food and options, it was during this time that another human fell down and died in the woods of Snowdin, it was also during this time that your species was revealed, but they were okay with the face that you had to eat the flesh of humans, not like they were any better. Then it marked your 5th year in the Underground when suddenly, everything went black while check the traps with Papyrus.

    Language:
    English
    Words:
    4,651
    Chapters:
    3/?
    Comments:
    10
    Kudos:
    117
    Bookmarks:
    29
    Hits:
    933
  19. Tags
    Summary

    I've always been like this. Stuck in the dark only ever seeing inches of the light. Until I'm snatched away from it time and time again.

    After all I was born like this. Needing the blood and magic of others to stay alive. I do my very best to only take what I need.

    That being said I don't know what came over me when I saw that small bright blue skeleton. He...he just smelled so good to the point it made my brain fuzzy.

    I swear I didn't mean to claim him.

    Language:
    English
    Words:
    8,482
    Chapters:
    7/?
    Comments:
    54
    Kudos:
    227
    Bookmarks:
    39
    Hits:
    2075
  20. Tags
    Summary

    (Y/n) was a troubled 23 year old with a criminal record who'd never had a chance to have a normal life that is until she's captured by the Great and Terrible Papyrus of the Ebott Police Department. Going straight though isn't easy, but Papyrus has promised his protection and Sans's even if his brother at first isn't so thrilled with their newest guest. Things only get more complicated when the brothers start to realize they have feelings for her.

    Language:
    English
    Words:
    17,172
    Chapters:
    7/?
    Comments:
    22
    Kudos:
    121
    Bookmarks:
    26
    Hits:
    2220

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