1 - 20 of 249 Works in Alternate Universe - Fellswap (Undertale)

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  1. Tags
    Summary

    So I literally never see anything with a diabetic main character and especially not a diabetic /Reader fic. Skeletons are sexy so lets play around with ideas while I get a diabetic reader a harem of their own!
    (I have been diabetic over 20 years and I honestly can't tell if I should be annoyed or amused at my own title)

    Series
    Language:
    English
    Words:
    10,724
    Chapters:
    31/?
    Comments:
    5
    Kudos:
    91
    Bookmarks:
    9
    Hits:
    1,632
  2. Tags
    Summary

    When your creations turn into reality, things were never meant to go well. Both you and your brother turn into the characters that both of you created and dread to be in. An alternate universe full of death and war.

    -----

    You were tired from this. Hell, both of you were. You were placed in the front lines while your brother created dangerous explosives. All of this just to survive, to live for another day. All memories are forgotten of who you once were before this painful life.

    Who knew a sudden mishap of a machine could be a savior for the both of you?

    Language:
    English
    Words:
    13,786
    Chapters:
    7/?
    Comments:
    106
    Kudos:
    476
    Bookmarks:
    142
    Hits:
    5,808
  3. Tags
    Summary

    Where you, as the reader, are Sans. And your best friend is.. Papyrus? And now theres Sans? And Papyrus? And Papyrus and Sans and.. This guy says his name is Dust? And that guy looks like he's covered in gunk, and why is this Papyrus calling himself Stretch?

    Blurb;

    “Do we call each other Sans and Papyrus?” He beats you to the question the moment you open your mouth, startling a chuckle out of you. You walk over to him, draping yourself over his shoulders with a long-suffering sigh. “I guess I could just call you bro. Are you the older of us now?” You blink, looking at him through the mirror.

    No update schedule, I can barely remember to write. Ill try though!

    Language:
    English
    Words:
    35,474
    Chapters:
    9/?
    Comments:
    39
    Kudos:
    190
    Bookmarks:
    46
    Hits:
    2,193
  4. Tags
    Summary

    After being cheated on by your now Ex Boyfriend (with your best friend no less), you decided to go back to your roots and visit your grandmother. Much to your surprise, she has adopted a gaggle of skeletons who make her big house livelier. Go figure. You might stick around longer, just to make sure these skeletons aren't bad to the bone.

    Language:
    English
    Words:
    114,043
    Chapters:
    23/?
    Comments:
    868
    Kudos:
    1,061
    Bookmarks:
    260
    Hits:
    22,625
  5. Tags
    Summary

    Stretch (US!Papyrus) and Mutt (FS!Papyrus) remember their friend saying he'd like to try being submissive. He's too stuck in his ways to ever do it, though, so they take matters into their own hands.

    Red (UF!Sans) gets tied up against his will.

    Language:
    English
    Words:
    3,428
    Chapters:
    2/5
    Comments:
    4
    Kudos:
    7
    Hits:
    120
  6. Tags
    Summary

    You just need a place to stay while you make it through the hell America calls "College".

    Working for Asgore at a cozy, little tea and flower shop and depending on your friend, Nay, to stay sane, you try to ignore whatever drama is going on with Audrey and her skeleton army.

    But as trust crumbles and romance fades, what will you do when the skeletons start to come to you for comfort and any semblance of love?

    What happens when the skeletons start to expand their horizons beyond Audrey, and how will you avoid the wrath of the said woman when shit hits the fan?

    Who the fuck knows, certainly not you.

    -------
    This fic was originally discontinued, but I'm rewriting and continuing this shit bbg

    Series
    Language:
    English
    Words:
    5,556
    Chapters:
    3/?
    Comments:
    25
    Kudos:
    345
    Bookmarks:
    68
    Hits:
    4,285
  7. Tags
    Summary

    Your life wasn't anything special in your opinion. Your days mostly just included going to university lectures or bumming around in your apartment. That not so slowly began to change one summer, when you happened to make eye contact with a tall, dark and handsome... skeleton? Wait, that's a lot of skeletons... and are they supposed to be this handsy?!

    Now you find yourself having to handle armfuls of bones and more puns than you could count time and time again but, honestly, you couldn't be happier!

    OR

    Female!reader being pulled into lots of domestic and fluffy situations with as well as growing closer to the many different Sanses and Papyri, with some romance finding its way in there, too.

    Language:
    English
    Words:
    109,914
    Chapters:
    22/?
    Collections:
    1
    Comments:
    210
    Kudos:
    349
    Bookmarks:
    102
    Hits:
    11,367
  8. Tags
    Summary

    Last I checked I had just gotten home from work. Now I'm sitting on the floor in some musty basement and- IS THAT SANS THE SKELETON?

     

    Basically isekai but Undertale +AU friends. Oh yeah also it's reverse harem. Aka a fic that's been done before. A bunch. (Whoops)
    Buuuuut, it has my own spin and my own (obviously hilarious) humor to it :)

    Also yes I have both Swapfell and Fellswap. And yes, they are two separate AUs. Swapfell is more like Underswap, and Fellswap is more like Underfell. (Swap doesn't look like a word anymore.)

    Language:
    English
    Words:
    16,154
    Chapters:
    6/?
    Comments:
    67
    Kudos:
    166
    Bookmarks:
    32
    Hits:
    1,814
  9. Tags
    Summary

    So many universes are based off two extremes; Pacifist and Genocide. Sans knew that far too well. With so much of his world based off of Karma, Murphy's Law, and varying degrees of luck, he should have figured that his own would run out with the worst timing possible. Slingshot across universes mid-way through a Genocide timeline, Sans now has to live with his alternates, get along with said alternates, navigate a new universe, refrain from breaking the new universe, and fix the machine to get home and save Papyrus by forcing the kid to RESET.

    It always feels like the world rests on his shoulders. It's just bad luck.

    Series
    Language:
    English
    Words:
    8,138
    Chapters:
    7/?
    Kudos:
    2
    Bookmarks:
    1
    Hits:
    25
  10. Tags
    Summary

    After the barrier had been broken, it released a powerful magical wave that subconsciously triggered a hidden component in some of the mage’s bloodlines. Supposedly all the extra magic needed to go somewhere and had thus chosen to go back to where it was originally drawn from, meaning a lot of people were finding out who was involved in the monster vs human war.

    And that’s where Crumble’s memories ended.

    or

    Another Human turned Skeleton Story where our protagonist must survive the horrors of friendly smiles and goodwilled monsters.

    Language:
    English
    Words:
    3,223
    Chapters:
    1/?
    Comments:
    2
    Kudos:
    14
    Bookmarks:
    8
    Hits:
    109
  11. Tags
    Summary

    Jessica just got told off by some girl for being a racist after telling two monsters to be quiet in a library. Her coworker is under the impression that she's out to seduce their employers. Her cousin can't stop gushing about these skeletons who she keeps running into.

    The antagonist, the usurper, the rival—Jessica is beginning to play many roles as her life becomes intertwined with these girls and their skeletal beaus. Funny thing is that all Jessica wants to do is make money and go home.

    Language:
    English
    Words:
    9,682
    Chapters:
    3/?
    Comments:
    25
    Kudos:
    123
    Bookmarks:
    30
    Hits:
    1,563
  12. Tags
    Summary

    Moving into your grandparents old farm house was not what you expected. Armed with your dog, your close online friend, and your extremely talkative brother, you’re so not ready to face anything that comes your way. Meeting your online friend by pure accident? He has many jobs that he juggles? He’s a skeleton? The last one caught you off guard, but that’s fine. You just need to make sure Missy doesn’t bite his leg every chance she gets.

    Language:
    English
    Words:
    5,304
    Chapters:
    3/?
    Comments:
    17
    Kudos:
    64
    Bookmarks:
    22
    Hits:
    717
  13. Tags
    Summary

    She has no name, other than what she takes from job to job. When she takes up her new job from a group of concerned skeleton fathers, she could not begin to suspect just how different this job is going to be.

    Language:
    English
    Words:
    3,948
    Chapters:
    3/?
    Comments:
    5
    Kudos:
    18
    Bookmarks:
    6
    Hits:
    206
  14. Tags
    Summary

    You're an engineer who works for Ebott's best research facility in one of the labs; your lifelong dream after finding a journal on Mount Ebott when you were a kid. When you aren't in the lab being smart, you're gathering materials at the abandoned doll factory for the machine you're trying to build.

    But one night, you meet a skeleton at the factory. Naturally, you lie about why you're there and say you're there to hunt ghosts. You befriend him and try to find a way to gather the materials while keeping up with that lie. But those lies catch up to you when you start to meet all the other skeletons.

    Edit: I've been going back to fix inconsistencies and add/remove details, I've gone up to ch 8 so far :)

    Language:
    English
    Words:
    63,270
    Chapters:
    24/?
    Comments:
    305
    Kudos:
    819
    Bookmarks:
    197
    Hits:
    15,754
  15. Tags
    Summary

    After getting laid off due to the Pandemic, Alicia spent the last two years looking for another job and purpose. Everything had been a hit or miss recently till she hears that New Ebott has much more opportunity. With nothing to lose, she goes to the city to try her luck, making many choices with no obvious outcomes, including many peculiar roommates. My first Undertale story, tags will be added as it progresses.

    Language:
    English
    Words:
    32,715
    Chapters:
    8/?
    Comments:
    10
    Kudos:
    13
    Bookmarks:
    2
    Hits:
    222
  16. Tags
    Summary

    To escape a timeline ruined by a cruel queen, Sans uses a machine to find somewhere safer for his brother. Unfortunately, the machine can only take one, leaving a very confused Papyrus in a strange new place with far more skeletons than normal for a single timeline. Worse, these variants are not in an original timeline variant - they're all in a FellVerse. Though, maybe that's not such a bad thing...

    Note: This is currently a work-in-progress.

    Language:
    English
    Words:
    1,606
    Chapters:
    1/1
    Comments:
    4
    Kudos:
    2
    Bookmarks:
    1
    Hits:
    26
  17. Tags
    Summary

    ''You didn't realise that skeleton monsters had the most beautiful eyes..''

    As it turns out, a chance meeting in a bar could lead you the most unexpected, happy, desperate times of your life.
    You had decided to move back home to Ebott City after finally breaking up with your asshole ex boyfriend, playing in bars and at parties was a good source of income but while your grandparents old home is being renovated you have nowhere to go.. until you’re pulled into a family of skeletons and their girlfriend. How unexpected..
    ...
    Oh.. You're pretty sure you've fucked one of her housemates.

    ''..If only they stopped glaring at you.''

    Language:
    English
    Words:
    78,933
    Chapters:
    54/?
    Comments:
    679
    Kudos:
    1,457
    Bookmarks:
    254
    Hits:
    37,372
  18. Tags
    Summary

    Life becomes more and more difficult either way.

    You begin to become a bit hopeless. As your band had failed, your over fancy mom wouldn’t leave you alone and you were basically broke. Imagine Your roommate and her friend being the only source of comfort! While you lived off of gas station money and Music that never made the cut, something bigger was happening...

    Who likes being pulled into another universe and meeting fictional video game characters?

    You do! obviously.

    Language:
    English
    Words:
    14,167
    Chapters:
    12/?
    Comments:
    21
    Kudos:
    49
    Bookmarks:
    11
    Hits:
    912
  19. Tags
    Summary

    The barrier has been broken for a few years now, monsters tensely coexisting with the humans. With the new influx of magic there's been a few cases of dormant mages waking up. Good or bad, humans were almost as tense with them as they were the monsters. This causes even more tensions and a new subgroup of humans.

    Prostitute and part-time barista turned mage, Adelaide has got to adjust to the influx of magic around and her new found powers. When a group of monsters stumble into her life it only complicates things. Shes got to face personal demons and trauma but this time shes not alone. What's in store for her?

    (This is a rewrite of my other fic, Devoid of Color. Please feel free to change Adelaide's name to your own while reading if that suits your fancy. Reader is named and is also described. Also posted on my Wattpad.)

    Language:
    English
    Words:
    6,199
    Chapters:
    2/?
    Kudos:
    4
    Bookmarks:
    2
    Hits:
    148
  20. Tags
    Summary

    This is basically a series of stories I may not even continue, just to prevent me from creating a new fic every time.

    Language:
    English
    Words:
    3,555
    Chapters:
    3/3
    Comments:
    7
    Kudos:
    9
    Bookmarks:
    2
    Hits:
    157

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