1 - 20 of 198 Works in Big Brother Sans (Undertale)

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  1. Tags
    Summary

    DIRECT SEQUEL/EPILOGUE TO “PATCHWORK SOUL” — 3 months later. A family of monsters and their little human kid try to start life anew beyond the confines of a giant mountain. Maybe they find something. Maybe they lose something. Time flows ever onwards, but sometimes it goes sideways, and it's heavier than they thought.

    [Please read PATCHWORK SOUL, know all major canon timelines, and the music of Undertale before reading for the best experience.]

    [An extended AU of what happens after a specific time kid's True Pacifist ending.]

    Series
    Language:
    English
    Words:
    267,564
    Chapters:
    27/?
    Comments:
    49
    Kudos:
    74
    Bookmarks:
    3
    Hits:
    699
  2. Tags
    Summary

    Alphys creates a machine that can display a monsters memories and invites Sans, Papyrus, Undyne, Toriel, and Frisk to help test it out. Sans is suspisious but agrees to help. His suspisions turn out to be well founded when something goes wrong and they have no way to stop the test. To make matters worse the one person who didn't want his memories shown is having them played like a movie. Now the group is forced watching Sans' most important memories to the end but maybe it could be fate. Sans has been secretive far too long or are somethings better left forgotten.

     

    *every other Saturday updates (or Sunday if I'm behind)*

    Language:
    English
    Words:
    34,527
    Chapters:
    21/?
    Comments:
    59
    Kudos:
    181
    Bookmarks:
    20
    Hits:
    2034
  3. Tags
    Summary

    Frisk grew up in a home with neglectful, drug using parents. With a little sister to take care of, Frisk goes to Mt. Ebott to collect a flower specimen for a professor in town who was willing to pay three hundred dollars for it. When she falls into the Underground, she finds danger, but also family and friendship. With the help of a mysterious ghost girl named Chara who only she can see and who she shares a connection with, as well as some new friends, especially a certain pair of skeleton brothers, Frisk tries to get back home to her sister, but what will be the cost? And how far will Frisk go to protect both her sister and her new friends?

    Language:
    English
    Words:
    99,803
    Chapters:
    16/?
    Collections:
    1
    Comments:
    275
    Kudos:
    302
    Bookmarks:
    58
    Hits:
    5742
  4. Tags
    Summary

    You went to the bookstore one day to buy some manga.

    You got a whole lot more than you bargained for.

    You end up somehow saving the Royal Scientist's life, and her fiancée can't thank you enough for it.

    So that's how you find yourself surrounded by people who love you for who you are and don't want you to change.

    But what's up with these strange dreams you're having? And, why does a certain punny skeleton get so spooked at the number 17? And...who is that tall skeleton with cracks in his face that you keep seeing in your dreams? Did the ambassador of monsters just join your swim team? Can this summary get more cliché?

    ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

    This is my first fanfiction on AO3, so constructive criticism is appreciated!

    Sporadic updates because life. ;u; I'm sorry. Longer chapters to make up for inactiveness: 5k words minimum.

    "UNDERTALE" by Toby Fox

    ARC 1 - The Elucidation : 1-13 *Complete!*
    ARC 2 - *not named yet* : 14-???

    ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

    Dedicated to ASH, my Latin teacher. 1981-2020. Docendo discimus.

    Series
    Language:
    English
    Words:
    165,640
    Chapters:
    30/?
    Collections:
    1
    Comments:
    491
    Kudos:
    820
    Bookmarks:
    160
    Hits:
    15533
  5. Tags
    Summary

    Frisk is a young woman, trying to survive the seedy and dangerous streets of a 1920's city. One day she plans to abandon the mafia ridden town behind her and settle into an idyllic country lifestyle. But for now, she has to face the horrors the city has to offer. She's done things to survive her past... but how much farther can she go to survive her present? This city doesn't plan on letting her go without a fight. Will a certain skeletal monster help or hinder her journey? Frisk has to be careful deciding. The wrong choice could land her right back where she started.

    Language:
    English
    Words:
    5,437
    Chapters:
    1/?
    Comments:
    8
    Kudos:
    26
    Bookmarks:
    5
    Hits:
    124
  6. Tags
    Summary

    Far away and long ago, two races ruled over Earth, Humans, and Monsters. However, why is it that when all was at peace the races began to stir conflict out of nowhere?

    (F/n) has always been bad luck and to be frank, was never more than a pawn into someone else's game. When you think you've finally bested your inner demons they conquer your mind once more, caging you to the decision to either fight against your own race or fight against the family that never stopped believing in you.

    Language:
    English
    Words:
    20,083
    Chapters:
    21/?
    Comments:
    3
    Kudos:
    38
    Bookmarks:
    9
    Hits:
    856
  7. Tags
    Summary

    Secret Santa gift fic

    Gaster (dadster), Papyrus, and Sans spend some time together bonding over camping, fun, and the stars. Pure fluff.

    Series
    Language:
    English
    Words:
    2,234
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    11
    Bookmarks:
    1
    Hits:
    110
  8. Tags
    Summary

    Flowey doesn't deal with loss very well. He hated losing Chara, he hated losing his soul, he hated losing control of the timeline, he hated losing to Frisk over and over. So when he finds something that makes life worth living once again, he will be damned if anything tries to take that away from him.

    Language:
    English
    Words:
    56,006
    Chapters:
    16/?
    Comments:
    168
    Kudos:
    286
    Bookmarks:
    39
    Hits:
    4353
  9. Tags
    Summary

    Sans had always loved space.

    Ever since his father had placed a book on astronomy into his eager seven year old hands, he had been enraptured.  He dreamed about making it to the surface to see the stars with his own eyes and show his brother the constellations.

    But losing his father and constant resets by a psychopathic, soulless flower stole his dreams away.

    Until he met a girl with stars in her eyes.

    Language:
    English
    Words:
    1,801
    Chapters:
    1/1
    Collections:
    1
    Comments:
    4
    Kudos:
    42
    Bookmarks:
    4
    Hits:
    308
  10. Tags
    Summary

    Papyrus has never realized how afraid he is of knives... especially when someone in particular is holding one.

    Series
    Language:
    English
    Words:
    63,238
    Chapters:
    16/24
    Comments:
    142
    Kudos:
    497
    Bookmarks:
    65
    Hits:
    7520
  11. Tags
    Summary

    you aren’t Real, but for him... for your little brother, you can pretend.

    (in which Sans is Papyrus’s imaginary friend, and magic is both a wonderful and terrifying thing.)

    Language:
    English
    Words:
    57,490
    Chapters:
    100/100
    Comments:
    1748
    Kudos:
    1228
    Bookmarks:
    155
    Hits:
    13309
  12. Tags
    Summary

    In volunteering to help Alphys with SCIENCE, things go wrong.

    Now Sans' friends and family are getting dragged through his memories with a front row seat to his trauma.

    ~~~

    "No! No" Sans screamed as he started to panic, "nononononononono! NO!"

     

    "S-s-sans! Pu-p-please d-don't p-pani—"

     

    Then everything went white.

    (This is mainly for fun and kinda goes crazy in places)

    Language:
    English
    Words:
    2,166
    Chapters:
    2/?
    Comments:
    25
    Kudos:
    39
    Bookmarks:
    8
    Hits:
    356
  13. Tags
    Summary

    Gaster's not even really interested in CS-1 or project PERSEVERANCE, he's just working on it because the current Royal Scientist told him to, and the king told the Royal Scientist to look into the option in the first place, so, hey, there's really not many ways he can argue his way out of this one. He'll just wait for the experiment to fall flat on its face so he can get back to the projects he actually wants to work on.

    (CS-1 wasn't supposed to have a mind, and Gaster was not supposed to care about him.)

    ((Will be updated with ending summary and askblog pics for archival))

    Language:
    English
    Words:
    59,171
    Chapters:
    18/?
    Comments:
    381
    Kudos:
    1060
    Bookmarks:
    230
    Hits:
    18758
  14. Tags
    Summary

    Monsters came to the surface the same day you moved to Ebott. A year later, you go explore the underground with your best friend and find a strange machine. It seems like fate is leading you into the arms (and SOULs) of lonely and troubled monsters.

    Series
    Language:
    English
    Words:
    1,850
    Chapters:
    2/?
    Comments:
    9
    Kudos:
    53
    Bookmarks:
    16
    Hits:
    607
  15. Tags
    Summary

    The story where Papyrus makes a friend that at first Sans believes to be an imaginary friend, until he learns that the friend is anything but.

    Language:
    English
    Words:
    2,109
    Chapters:
    1/?
    Comments:
    4
    Kudos:
    13
    Hits:
    99
  16. Tags
    Summary

    Papyrus promised he wouldn't foolishly risk his life ever again...

    What does he end up doing?

    If you don't like spanking, then read something else.

    Language:
    English
    Words:
    1,597
    Chapters:
    1/1
    Kudos:
    11
    Bookmarks:
    2
    Hits:
    234
  17. Tags
    Summary

    Sans' eyelights roamed over the form under him. She turned to face him; her vulnerability clawed his insides with amusement. The reality for the human was more than apparent to him, more than anyone would ever know.

    don’t let this dampen your sparkle, sunshine, Sans thought, staring down at her with empathy, this is just the beginning.

    Language:
    English
    Words:
    1,843
    Chapters:
    1/?
    Comments:
    1
    Kudos:
    21
    Bookmarks:
    3
    Hits:
    157
  18. Tags
    Summary

    The Kingdom of Monsters sealed beneath Mt. Ebbott is a kingdom divided.

    After the deaths of the Royal Children and Asgore’s declaration of war, the order was given that any humans who fall would be killed and their souls used to break the barrier and for a time, the citizens of the kingdom were content to wait for all seven souls that were needed.

    It wasn’t until many years later after the next human’s fall and subsequent death that many monsters spoke out against the King’s decree and insisted that the human soul should be absorbed and used to free the kingdom. It wasn’t long before civil war broke out amongst the people of the Underground.

    The group that wanted to use the soul eventually lost the battle and were forced to the lands far from the Capital, the whole of these places serving as a prison for the defeated monsters. Waterfall and Snowdin have long since been forsaken, their residents a mix of dissenters and criminals sent away by the Capital.

    When Sans and his brother receive information regarding strange incidents occurring in town over the last few weeks, their investigation leads them to discover something that will shake the whole kingdom to it’s core.

    Language:
    English
    Words:
    8,163
    Chapters:
    7/?
    Comments:
    19
    Kudos:
    18
    Bookmarks:
    5
    Hits:
    168
  19. Tags
    Summary

    the people around you are a bit more concerned about your wellbeing than you like.

     

    “i haven’t been avoiding you,” you say.

    you’ve only had more important things to do at the most inopportune times, unfortunately.

    “CUT THE CRAP,” gaster says. “LET US WORRY OVER YOU IN PEACE.”

    Language:
    English
    Words:
    5,311
    Chapters:
    4/?
    Comments:
    12
    Kudos:
    79
    Bookmarks:
    8
    Hits:
    912
  20. Tags
    Summary

    A human falls from Mount Ebott and no one cares or will miss him.

    Reason? One thing leads to another and they weren't human, well, at least not totally...

    They were half monster.

    Language:
    English
    Words:
    5,625
    Chapters:
    3/?
    Comments:
    2
    Kudos:
    40
    Bookmarks:
    9
    Hits:
    473

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