1 - 20 of 2716 Works in Alternate Universe - Underfell (Undertale)

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  1. Tags
    Summary

    “-for the last time, just because the machine “already works in one reality”, doesn’t mean it will in ours."

    “but it means its not impossible. infinite possibilities mean that by rights, the machine has already worked- “

    “It also means it already hasn’t, Sans, you’re intentionally being difficult right now- “

    “i bet you wish you were in the alternate reality where you weren’t having this conversation then huh?”

    "I will put you back in the dirt skeleton, don't try me-"

    Sans and Alphys try to access alternative universes. It goes about as well as one might expect.

    Language:
    English
    Words:
    2,015
    Chapters:
    1/?
    Kudos:
    2
    Hits:
    9
  2. Tags
    Summary

    A series of short one-shots for the Spicyhoney boys.

    Language:
    English
    Words:
    44,969
    Chapters:
    34/?
    Comments:
    464
    Kudos:
    385
    Bookmarks:
    27
    Hits:
    3714
  3. 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:
    4,500
    Chapters:
    45/?
    Comments:
    331
    Kudos:
    77
    Bookmarks:
    5
    Hits:
    1274
  4. Tags
    Summary

    Updated Summary-
    Welcome to my take on MsBigBoots's hardcore Underfell! Twenty years ago the portal machine was destroyed, cutting Red, Edge and their newborn sons off from the multiverse.

    Now, Gothic, a cruel and unforgiving product of Fell, is reluctantly leading a hopeful rebellion against the tyrannical Asgore while everything falls apart around him.

    His twin brother Lombok, with his anomalously loving Soul, who wants nothing more than to make his father proud and to turn the Royal Guard into something respectable again, struggles to balance who he is versus the world he lives in.

    Papyrus tries to strengthen them by showing the only kind of love he knows- tough.

    And poor Sans just wants his boys to be happy, is that too much to ask? Sorry Red, it sure is.

    Language:
    English
    Words:
    60,647
    Chapters:
    19/?
    Comments:
    33
    Kudos:
    14
    Bookmarks:
    2
    Hits:
    174
  5. Tags
    Summary

    You were never anything special.. Well you could create perplexing and staggering worlds in your head, writing them onto paper and taking the breath away from those who may read your work. You always went to tell tales to kids at the libraries you occasionally volunteer to read at or entertain the elderly at nursing homes by sharing your adventurous worlds with them. Your.. friend.. Payton offered to let you stay with her and her.. friends? boyfriends? while in college when you were looking for a place to live.. She said you could if you paid a small amount of rent and made her a character in your oncoming book.. (you're just gonna kill her off in chapter 10 or something) And that's how you ended up staying with a bitch and a couple of monster skeletons who were head over heels for her but assholes to you.

    ..that is until later on..

    this book is inspired by the book The Understudy by Fizzleup .. but like nothing like it.. it just made me wanna write also this is saying chapter 1/1 but there will be more chapters.

    Language:
    English
    Words:
    4,285
    Chapters:
    4/?
    Comments:
    48
    Kudos:
    139
    Bookmarks:
    26
    Hits:
    908
  6. Tags
    Summary

    I write tiny fluff for myself when I get stressed out or down on my tumblr... And some people have requested it to be posted on Ao3 too, Haha ^^ (I'll put the links to the original post in the end notes! I'll update whenever I do make em, there's no schedule for this one!)
    I will be mostly still be posting them on tumblr, but this is a way you can find them all at once. Most of them are unrelated except of a tiny series I call "6 Skeletons and the Crasher" that has no chronological order of tiny snippets of reader's life in one house with 6 skeletons.
    Summaries for each of the snippets will be put in the notes!
    I hope you enjoy the fluff!

    Language:
    English
    Words:
    31,380
    Chapters:
    20/20
    Comments:
    39
    Kudos:
    180
    Bookmarks:
    13
    Hits:
    3449
  7. Tags
    Summary

    A woman breaks free from the bonds of a "brothel" and flees into Ebott in search of escape. In reality, though, she winds up trapped in the Underground with escape barred off and teeth bared back.

    Co-written with Bloodpix

    Language:
    English
    Words:
    47,247
    Chapters:
    8/?
    Comments:
    21
    Kudos:
    103
    Bookmarks:
    18
    Hits:
    2856
  8. Tags
    Summary

    Even more drabbles from the BAON universe!

    Series
    Language:
    English
    Words:
    8,830
    Chapters:
    9/?
    Comments:
    226
    Kudos:
    124
    Bookmarks:
    3
    Hits:
    1005
  9. Tags
    Summary

    (Y/N) (L/N) was once an icon; an absolute icon to the masses. But destroyed out of jealousy, she is given a new chance with a brand new power and is thrown right smack dab in the pre-main plot of Undertale, where everything hasn't gone to shit yet from Frisk's meddling.

    And she'll be damned to let these poor souls rot beneath ground, not when she has the power to stop it.

    And dammit all, she WILL persevere and achieve her goal!

    ...

    Now if only she wasn't so damn attached to Flowey.

    Series
    Language:
    English
    Words:
    61,981
    Chapters:
    16/?
    Comments:
    194
    Kudos:
    488
    Bookmarks:
    105
    Hits:
    5116
  10. Tags
    Summary

    You have never felt as unwanted as you do now. You look at them from afar, seeing her beautiful figure on his arm as if she belonged there. Smile, just force your happiness for them, even if it hurts and couldn't be farther from your true feelings. 'Pretend, pretend, and pretend.' Don't show how broken and hurt you are inside. A month passes and you hadn't realized you weren't the only one that had been affected with this new dilemma. You see him there, miserable and defeated, just like you.

    Language:
    English
    Words:
    34,320
    Chapters:
    8/?
    Comments:
    151
    Kudos:
    627
    Bookmarks:
    120
    Hits:
    4917
  11. Tags
    Summary

    Machine broken, Rus finds himself stuck in Underfell while he works on getting it fixed. Until then, he has to deal with Edge, Red's (maybe not so) insufferable brother.

    Language:
    English
    Words:
    4,740
    Chapters:
    2/?
    Comments:
    14
    Kudos:
    38
    Bookmarks:
    3
    Hits:
    157
  12. Tags
    Summary

    you're a vampire scientist who works with two skeletons, but the third one worrys to much for your taste. but how could you say no to that cinnamon bone?

    Language:
    English
    Words:
    1,469
    Chapters:
    2/?
    Comments:
    13
    Kudos:
    33
    Bookmarks:
    10
    Hits:
    321
  13. Tags
    Summary

    Red appears in a strange world unlike his. Everyone says hi to him, everyone worries about him...and he can see the sun!! What was going on?

    It didn't matter. What mattered to him was keeping far away from Gaster...and keeping his baby safe.

    (A story that just wouldn't leave me alone, so I'm back, again, here, right now. Will include very much explicit sex scenes at later dates, and I'll put warnings up)

    Series
    Language:
    English
    Words:
    115,031
    Chapters:
    62/?
    Comments:
    681
    Kudos:
    297
    Bookmarks:
    36
    Hits:
    4989
  14. Tags
    Summary

    The RESET saved the world, but not everything was saved. With Dat gone from her life and raising Cherry alone, Zerrus continues to face her sins with a constant reminder.

    Cherry knows something is wrong, and she's determined to find out what.

    Series
    Language:
    English
    Words:
    23,714
    Chapters:
    6/?
    Hits:
    8
  15. Tags
    Summary

    Your name is Y/N and you had a wonderful life! NOT. your boyfriend was an abusive, racist prick that you couldn’t seem to get away from. He hated the Monster kind and anything to do with them, so that's why you were now at the famous Monster owned business called Grillby’s just to spite the asshole. You set there drinking away all your self loathing for staying with him just for feeling bad for him. He would always cry and apologize when you wanted to leave and you would always stay.You wanted out. You had enough and missed that single life, the question is, how do you escape?

    You got your answer when a large, edgy, and hot skeleton monster walks in and sets beside you. As soon as your eyes meet his red eye-lights, you feel a shock go straight to your very Soul. you knew what this meant with how often it came up now that Monsters came up from the underground.

    You had found your Soulmate.

    Language:
    English
    Words:
    14,569
    Chapters:
    6/?
    Comments:
    71
    Kudos:
    264
    Bookmarks:
    60
    Hits:
    2768
  16. Tags
    Summary

    Born from a thorned "Atropa belladonna"—or a nightshade (berry) bush and the blood of a Mage, you were considered an abomination upon your brethren of the Fae Folk for many centuries. You roamed the world as an outcast; studying humanity as it rose and fell, only to repeat the process time and again, and gaining knowledge outside of the Faerie Realm. Until one day, your sins were forgiven as you put yourself on the line to save the Faerie Realm from unjust damnation at the cost of half of your power. That was 150 years ago, and now—in the year 20XX—with the release of your races’ long lost brethren, the Monsters; the world of Humans and Fae are shaken once more…However…Something is strange…

    Language:
    English
    Words:
    25,237
    Chapters:
    7/?
    Collections:
    1
    Comments:
    158
    Kudos:
    250
    Bookmarks:
    57
    Hits:
    1885
  17. Tags
    Summary

    Papyrus and his Detective partner (you) have to solve a missing persons case. It turns into a huge undercover operation where you still have to rescue the missing person: Sans!
    Along the way there's shenanigans, swearing, sex, misunderstandings, bad puns, and you fall in love with your spiky partner's brother.

    Language:
    English
    Words:
    57,032
    Chapters:
    17/?
    Comments:
    139
    Kudos:
    338
    Bookmarks:
    64
    Hits:
    3560
  18. Tags
    Summary

    A picture perfect family hides the fact that your life is filled with manipulation and abuse. When you move away after high school, you encounter more than one skeleton monster that often tests your anxieties.

    Hey...why are they acting like that?
    *updated description

    Series
    Language:
    English
    Words:
    150,779
    Chapters:
    35/?
    Comments:
    427
    Kudos:
    833
    Bookmarks:
    167
    Hits:
    15005
  19. Tags
    Summary

    Dreams are a mixture of memories and imagination come to life in the recesses of your mind. They let you escape from reality, and explore your fantasies that you could never experience in real life. But what do you do if the dream starts to seem a little bit too real? Do you just try to embrace the dream (while thoroughly denying that any of it is real at all), or try to use DETERMINATION to survive and escape back to the real waking world? The struggle becomes real when you have to choose between flirting (sexual harassing) with skeletons, or waking up to face reality. Which would you choose?
    *Summary edited: 6/10/18*

    Language:
    English
    Words:
    15,353
    Chapters:
    7/?
    Comments:
    19
    Kudos:
    41
    Bookmarks:
    7
    Hits:
    379
  20. Tags
    Summary

    You're sitting in the back of a van with two other versions of yourself and somehow this is not the strangest thing that's happened to you today. The strangest thing that's happened to you today is going to bed in your home and waking up on the streets of an unfamiliar city in the pouring rain.

    Language:
    English
    Words:
    9,697
    Chapters:
    2/2
    Comments:
    19
    Kudos:
    129
    Bookmarks:
    16
    Hits:
    807

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