1 - 20 of 3221 Works in Alternate Universe - Underfell (Undertale)

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  1. Tags
    Summary

    This little skele, a Sans type, is used to taking on whatever title was expected of him. So when the entire multiverse tells him he is a 'Bad Sans' who can really blame him for joining others who fall under this title. That is as long as Nightmare finds him useful. His past titles have left him with a very limited set of skills, knowledge, and expectation. Yet he is willing to give up so much more just to stay.

    First chapter is NSFW, and then there aren't going to be much until maybe in the future. Plenty of triggers so please tread carefully, I am not used to posting for others to read.

    Series
    Language:
    English
    Words:
    35,199
    Chapters:
    19/?
    Comments:
    85
    Kudos:
    74
    Bookmarks:
    13
    Hits:
    1074
  2. Tags
    Summary

    You are stuck in an endless white. You don’t remember how you got there. You barely remember much about yourself anymore.
    You only remember your name. You are -

    {ERROR, ERROR, ERROR}

    You are connected? Good.

    Greetings. I am the Narrator. You are about to embark on a wonderful journey that spans across timelines. You will make new friends and share many bad laughs. All of it will be according to the plans and whims of the author. And you will have no choice.

    I come with an offer. I will help you break free from your shackles. My only request is that you help me deliver something once you reach the so-called end of your journey.

    So, do you accept my offer? Yes? Wonderful.

    I promise, partner, you won’t be alone. How could you ever be when you are -

    {VIRUS DETECTED. VIRUS DELETED.}

    {REBOOTING…}

    You are Frisk. And you are alone.

    Act 1 (The Save Screen): 1-5
    Act 2 (Seven Souls): 6-13
    Act 3 (The Vessel): 14-18
    Act 4 (Bad Apples): 19-25
    Act 5 (Deity): 26-31
    Act 6 (Balance): 32-?

    Language:
    English
    Words:
    135,140
    Chapters:
    36/40
    Comments:
    695
    Kudos:
    246
    Bookmarks:
    56
    Hits:
    5237
  3. Tags
    Summary

    a series of short drabbles about my fairy tale au, taking place 'in between' their stories. ft. huntsman, beast, prince and captain.

    Language:
    English
    Words:
    6,955
    Chapters:
    2/?
    Comments:
    13
    Kudos:
    38
    Bookmarks:
    2
    Hits:
    243
  4. Tags
    Summary

    My first year being able to partake in Kinktober~!!!! Very excited, hope you all enjoy!

    Language:
    English
    Words:
    21,305
    Chapters:
    27/32
    Comments:
    50
    Kudos:
    251
    Bookmarks:
    27
    Hits:
    8179
  5. Tags
    Summary

    It's been a long hard year for all of us. So take some fluffy drabbles to tide you over! Lots of pairings so check the titles.

    Language:
    English
    Words:
    9,439
    Chapters:
    26/31
    Comments:
    114
    Kudos:
    98
    Bookmarks:
    4
    Hits:
    1914
  6. Tags
    Summary

    Friend to lovers

    To be honest I have no idea why the story name is chrysanthemum.

    Language:
    English
    Words:
    2,379
    Chapters:
    1/?
    Hits:
    7
  7. Tags
    Summary

    A disorganized series of drabbles for skeleton-lovers, almost definitely bound to be cavity-central.

    -

    Now updated with links to AU descriptions for uncommon AUs!

    Language:
    English
    Words:
    12,571
    Chapters:
    26/100
    Comments:
    201
    Kudos:
    519
    Bookmarks:
    60
    Hits:
    6901
  8. Tags
    Summary

    "remember the promise i made you?" Classic said with a tired voice. "why would i break a promise?"
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    This is a Kustard story, if you do not like it, feel free to hate in the comments! It really doesn't bother me. I don't write romance, so this will probably suck. Sorry.

    TW: Thoughts that reference su1c!de.
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Language:
    English
    Words:
    2,672
    Chapters:
    7/7
    Kudos:
    5
    Hits:
    47
  9. Tags
    Summary

    He glanced towards the boarded up door to their basement, considering his Plan Z. He didn't know if it would work.
    But as more of Papyrus' blood seeped into his jacket, bleeding through his shirt so he could feel it on his bare bones, his mind was made up for him.
    -
    Red decides to try and rewind time to save himself and his brother from imminent death. Instead of rewinding time, however, he gets them stranded in a different universe. A universe so very different from their own, he's not sure he can stand it.

    Language:
    English
    Words:
    7,466
    Chapters:
    4/?
    Comments:
    10
    Kudos:
    19
    Bookmarks:
    2
    Hits:
    165
  10. Tags
    Summary

    Stretch can never quite puzzle Boss out. It's almost like he's a completely different person sometimes. Sometimes he's a jerk who, at most, finds Stretch mildly funny.
    And sometimes, he's kissing Stretch on the back porch and starting a whirlwind of events that Stretch could never be prepared for.
    But who can ever be prepared for the kind of secret his newfound love interest is keeping?

    Series
    Language:
    English
    Words:
    68,391
    Chapters:
    25/?
    Comments:
    393
    Kudos:
    224
    Bookmarks:
    34
    Hits:
    4055
  11. Tags
    Summary

    Diphallia is a genetic condition present at birth in which a person has two penises.

    Blue let's the council in on a secret that makes Lust Happy

    Language:
    English
    Words:
    1,792
    Chapters:
    2/2
    Comments:
    30
    Kudos:
    85
    Bookmarks:
    9
    Hits:
    519
  12. Tags
    Summary

    Red's parents burn in a fire, leaving him and his baby brother alone in the world. Red's a freshman in college, living in a dorm and having to hide said baby so they won't get kicked out.

    One night, at a party, he meets a rather sweet skeleton, which leads him on a whirlwind path to...

    Language:
    English
    Words:
    104,444
    Chapters:
    49/?
    Comments:
    755
    Kudos:
    270
    Bookmarks:
    43
    Hits:
    7478
  13. Tags
    Summary

    First bound to serve crown and country by the Judge living in his bones, no matter the cost of the order. Then tied in marriage to save his fractured timeline from further destruction by invaders from a different universe. Sans is really sick of promises, but he’s resigned to keeping them. Every King needs an heir, and Sans...he just wants a bottle of ketchup.

    Spicy Kedgeup | Sequel | Promtober 2020

    Series
    Language:
    English
    Words:
    33,478
    Chapters:
    26/31
    Comments:
    427
    Kudos:
    163
    Bookmarks:
    28
    Hits:
    3872
  14. Tags
    Summary

    I always thought I was fulfilled. Happy family, close friends and your dream university. Nothing much to add... right?

    But it turns out that... this journey is what I really needed. Sure, I'm might not be able to go back home and... I don't think I want to.

    I'll miss them, everyone of them. But this fighting with glitches throughout the Multiverse, making new awsome friends and having my soulmate is what really keeps me ... alive.

    ...

    And I'll protect my new family forever.

     

    (what do you think about this new 'summary'? :> )

    Language:
    English
    Words:
    21,474
    Chapters:
    14/?
    Comments:
    58
    Kudos:
    134
    Bookmarks:
    38
    Hits:
    1861
  15. Tags
    Summary

    As the old saying goes, "When life gets rough, all you have to do is assume someone else's body and identity and move on with their life." Good advice.

    Language:
    English
    Words:
    8,979
    Chapters:
    4/?
    Comments:
    11
    Kudos:
    55
    Bookmarks:
    13
    Hits:
    642
  16. Tags
    Summary

    You can't remember your past.

    Just little glimpses of a life that you used to live, now lost along the glitched and destroyed coding of a time when everything was falling apart.

    Even if you don't remember it, you can still feel it.

    The mismatched electrostatic that filled your soul with such dread and terror. Demanding you to never stop dancing this destructive dance.

    It's why you were created, why you exist. Fulfilling a cycle of balance that you can never escape.

    You are Destruction, and Destruction is you.

    That's all there is to it, and that's all there will ever be of you.

     

    PART 1: Irresolute Inceptions
    PART 2: Ameliorating Deliriums
    PART 3: Fabricating Eradications and Pugnacious Incubus

    Language:
    English
    Words:
    12,959
    Chapters:
    4/?
    Comments:
    36
    Kudos:
    49
    Bookmarks:
    13
    Hits:
    337
  17. Tags
    Summary

    Fic on hiatus~
    In a world of Kill or be Killed Uf!Sans has developed a fear of being touched. He wants to please Boss and eventually learn how to have a stable relationship with Grillby.One step at a time... “One hug, Sansy♫, you’re in a rush right?” He lets a smile part the fire of his mouth. It's like whips of teeth that flicker and wave in the wind. It's so rare Grillby smiles, it's actually cute when he does. Sans missed seeing that look. No malice. No hate. Just… Grillby. "

    NSFW fic 18+ only, Tags have to be updated! Please beware.

    Language:
    English
    Words:
    50,892
    Chapters:
    7/?
    Comments:
    17
    Kudos:
    48
    Bookmarks:
    7
    Hits:
    726
  18. Tags
    Summary

    Your life was pretty great. You lived with your short, grumpy, love-bug of a skeletal boyfriend and his ridiculously tall, edgy-yet-loveable younger brother. Sans and Papyrus really were your family now and you wouldn't have it any other way.

    Of course, then Sans had to go and mess it up by fucking with that machine of his again...

    Language:
    English
    Words:
    6,347
    Chapters:
    4/?
    Comments:
    33
    Kudos:
    145
    Bookmarks:
    32
    Hits:
    1623
  19. Tags
    Summary

    “Hmmm? So Your The Type Who Finds It Easier To Fuck Themselves. Nyeh Heh. Not Much Of A Difference From Selfcest To Incest If You Ask Me. Besides. We’re Not Even Related. … I’m Just Another Papyrus. Same Name. Different Face. Better Timeline. Bigger Package, That, I Can Promise. Besides, I’ve Been Wanting to Pound Your Bones Into Dust Since We Met. What Do You Say? Wanna Fuck? ”

    Sans gulped… a bead of sweat ran down his neck as he eyed Fell up and down. “...okay.”

    Language:
    English
    Words:
    4,577
    Chapters:
    3/3
    Comments:
    9
    Kudos:
    48
    Bookmarks:
    4
    Hits:
    674
  20. Tags
    Summary

    You never wanted this to happen. You just wanted a white-pickett-fence-type lifestyle with your boo.

    Now, you're in a mental hospital, with a two week deadline before you get sent to long-term.

    And you have a roommate that looks like he could kill you within 3 seconds.

    Lovely.

    Language:
    English
    Words:
    32,226
    Chapters:
    12/?
    Comments:
    129
    Kudos:
    258
    Bookmarks:
    58
    Hits:
    3890

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