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  1. Tags
    Summary

    In the aftermath of Asriel Dreemur and his beloved sibling's death, Royal Scientist Wingdings Gaster finds himself presented with an opportunity to experiment on the only human soul in the Underground. Faced with obstacle after obstacle, Gaster finds he may have to embrace darker methods to achieve his goal of breaking the Barrier - methods that there may be no returning from.

     

    Updates when it updates.
    Fridays, mainly.

    Language:
    English
    Words:
    174,621
    Chapters:
    60/?
    Comments:
    104
    Kudos:
    93
    Bookmarks:
    10
    Hits:
    3469
  2. Tags
    Summary

    What happens when two souls who have lost their want and will to live meet?
    Things don't go like in fairy tales, but in the end when do they?

    Language:
    English
    Words:
    38,816
    Chapters:
    18/?
    Comments:
    26
    Kudos:
    146
    Bookmarks:
    17
    Hits:
    1900
  3. Tags
    Summary

    Fontcest/Sancest/Papcest pairings with different kinks each day. Each day has their own kink(s) from a list!

    I will add tags as I post chapters. Chapters are of varying length. Always mind the tags please.

    Leave a kudos and comment, it really helps encourage me <3

    Language:
    English
    Words:
    23,565
    Chapters:
    20/31
    Comments:
    149
    Kudos:
    179
    Bookmarks:
    17
    Hits:
    4719
  4. Tags
    Summary

    Hi, I'm RTNightmare, and I wanted to try collaborating with others...

    So here, enjoy the wondrous one-shots from me and others, including inside jokes, stupidity, and insanity of various kinds. One shots can take place in Undertale or other AUs based on Undertale, as long as we have permission. We request that you get permission.

    Requests: Those who will take requests!
    RTNightmare: Depends on request!
    Rajani: Yes
    Angela: Not right now.
    CopyrightLink: UNKNOWN

    Series
    Language:
    English
    Words:
    21,505
    Chapters:
    10/?
    Comments:
    87
    Kudos:
    29
    Bookmarks:
    5
    Hits:
    469
  5. Tags
    Summary

    All the skeletons are either sad or dead.
    Blueberry is suddenly struck with an idea.

    Language:
    English
    Words:
    2,930
    Chapters:
    1/1
    Hits:
    10
  6. Tags
    Summary

    S-1 and S-2 are free,, they get through Gotland and find there way to grillby bar.
    Is grillby the friend they didn't have

    Language:
    English
    Words:
    238
    Chapters:
    1/1
    Hits:
    6
  7. Tags
    Summary

    What if all the monsters we got to know still spent their childhood on the surface, before the war happened? What if Sans used to be really fucking edgy as a 15 year old teenager? What if he managed to get chummy with a group of bad-boys that aren't exactly the best influence on him?
    What if I were actually good at writing summaries?

    Updates every Saturday
    Number of smut chapters: 8

    Series
    Language:
    English
    Words:
    360,713
    Chapters:
    113/?
    Comments:
    1619
    Kudos:
    1095
    Bookmarks:
    63
    Hits:
    21351
  8. Tags
    Summary

    Due to complicated and traumatic circumstances you (Miranda Castro) have been living on the streets for two years and a half. Your life could literally be made into a complicated and convoluted soap opera. You even have double personalities. Yup. No kidding. Meet your other half, Rajani.

    Usually you just go about your way not wanting to be bothered but not today. No, today you are going to talk to a celebrity robot about and impending attack on the monster ambassador Frisk which you are more than willing to help stop, all because a skeleton that’s going to be there decided to save you’re a month back.

    Series
    Language:
    English
    Words:
    215,182
    Chapters:
    49/?
    Comments:
    396
    Kudos:
    317
    Bookmarks:
    31
    Hits:
    4329
  9. Tags
    Summary

    Set of ficlets for the Kinktober 2017 promptlist.

    Language:
    English
    Words:
    3,793
    Chapters:
    6/32
    Comments:
    2
    Kudos:
    24
    Hits:
    273
  10. Tags
    Summary

    Your study on the monster origins leads you to seeking out ways of venturing into the underground. Now that they roam the earth side by side with humans, it’s your job to research their history and find out more about them. Your friend, colleague, and the ambassador of the monsters, Frisk, however refuses to help you… so once mistakes have been made, you find yourself having to count on a brand new friend to return to the surface.

    Language:
    English
    Words:
    201,731
    Chapters:
    33/36
    Comments:
    180
    Kudos:
    627
    Bookmarks:
    51
    Hits:
    9943
  11. Tags
    Summary

    203X

    Mt.Ebott

    Legend says that those who go there never return.

    Series
    Language:
    English
    Words:
    2,122
    Chapters:
    3/?
    Comments:
    4
    Kudos:
    3
    Hits:
    37
  12. Tags
    Summary

    THE MAGNIFICENT BLUE: Error there is no need to mess with him! Be kind!

    error: messing with who now

    xcellent: are you senile

    error: probably

    xcellent: xoddamnit

    -----

    Ink makes a chat with a bunch of Sanses. It doesn't end well.

    Language:
    English
    Words:
    14,153
    Chapters:
    7/?
    Comments:
    34
    Kudos:
    51
    Bookmarks:
    9
    Hits:
    441
  13. Tags
    Summary

    What is sanity to the mad? What is madness to the sane?

    Language:
    English
    Words:
    223,841
    Chapters:
    66/?
    Comments:
    548
    Kudos:
    638
    Bookmarks:
    59
    Hits:
    21320
  14. Tags
    Summary

    You're human enough you suppose, for a person with magic. You don't really bother about it under normal circumstances, so most people don't really wonder about it. Sometimes, it's so much a part of you you even forget it's there and just live your life normally.

    So when you end up using it on a complete stranger, and get pulled into more unusual circumstances than you're comfortable with, you figure perhaps that fate is tired of you ignoring it.

    Language:
    English
    Words:
    24,667
    Chapters:
    12/?
    Comments:
    132
    Kudos:
    203
    Bookmarks:
    35
    Hits:
    2012
  15. Tags
    Summary

    If he was being honest it did upset him. To have a version of himself hate him this much kinda hurt the self esteem a bit. But what could he do, it wasn't like he could make Red like him.

    Could he?

    Language:
    English
    Words:
    964
    Chapters:
    1/?
    Comments:
    4
    Kudos:
    23
    Bookmarks:
    4
    Hits:
    71
  16. Tags
    Summary

    you jumped into the underground, made your way through the ruins, and then you met sans. he likes what he sees and decides he's gonna keep you around for his own amusement. He's a nasty lil skeleton who never fails to remind you that he owns your ass and you kinda like it, but you also really don't. Consent as well as whether you like him or not is kinda a blurred, greyish area. Nevertheless, shenanigans and angsty love feels ensue

     

    Basically this will be shamelessly smutty and kinda twisted with nihilistic ideologies, dark humor and a fucked up lack of morals because I like that shit.

    Language:
    English
    Words:
    57,934
    Chapters:
    22/?
    Comments:
    137
    Kudos:
    210
    Bookmarks:
    34
    Hits:
    4285
  17. Tags
    Summary

    An Undertale drabble/short story collection.

    I present you with the UFbros, SF Sans and Alphys, a bit of Afterdeath, our classic Snowdin citizens, our daily dose of Swapfell conquering Underswap, Classicberry fluff, US Sansby, Errotic/Errorlust, some Fell Poth, and Doomfanger, among other things.

    Warnings in every chapter if they're needed
    A few of these are 16+.

    Series
    Language:
    English
    Words:
    91,418
    Chapters:
    57/?
    Comments:
    163
    Kudos:
    190
    Bookmarks:
    24
    Hits:
    5054
  18. Tags
    Summary

    A girl walks into a bookstore, but she doesn't have any money.

    Is this what hell looks like?

    .........

    A skeleton walks into a bookstore and spots a girl with a book.

    And she makes his SOUL sing.

    Language:
    English
    Words:
    9,133
    Chapters:
    5/?
    Comments:
    159
    Kudos:
    252
    Bookmarks:
    31
    Hits:
    1535
  19. Tags
    Summary

    Continuation of Cookie.

    Sometimes you don't realise you've fucked up until someone actually tells you. This is most definitely the case for Sans.

    Series
    Language:
    English
    Words:
    2,796
    Chapters:
    1/1
    Comments:
    7
    Kudos:
    31
    Bookmarks:
    1
    Hits:
    173
  20. Tags
    Summary

    (I do not own Error Sans, Undertale, any world in this, or any AU in this unless stated. They belong to their respectful owners. I only own this story and my OC's. This is a bunch of AU's of my story 'Healing What Has Been Broken.', where things went down a bit differently as Error made some different choices in the chapter 'Breaking Things At Breakfast.') The moment he saw that there was another Ink, Error panicked and screamed. He should have known better that he would be safe in any AU, all were the same to him. They all wanted to break him, make him wish for the mercy of death that he can never have. But the second time is the charm, right? All the Monsters watched in horror as the broken Monster made a portal to the VOID, but before he could fall in, the children jumped into his arms, falling with him into the dark abyss. Destiny interfered once more. Error now has his reason to live, but that is not the same as healing. How can he really let go when surrounded by the memories? So Destiny put Error and his children in a new Multiverse, one where it is different more then just personality for the others. Where the rules for SOULS and magic are different. Error immediately knows this is not his Multiverse...So what now?

    Series
    Language:
    English
    Words:
    93,407
    Chapters:
    7/?
    Comments:
    155
    Kudos:
    189
    Bookmarks:
    17
    Hits:
    2171

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