1 - 20 of 181 Works in Big Brother Sans (Undertale)

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  1. 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:
    47,993
    Chapters:
    82/100
    Comments:
    1331
    Kudos:
    928
    Bookmarks:
    118
    Hits:
    10097
  2. 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:
    47,399
    Chapters:
    14/?
    Comments:
    147
    Kudos:
    246
    Bookmarks:
    34
    Hits:
    3561
  3. Tags
    Summary

    When Frisk finished her story, barrier broken and monsters freed, she knew there was still a loose end, but she never expected everything to come unraveled before her eyes. Determined to save the only family she’s ever known, Frisk must stitch their lives back together after they are ripped apart at the seams and then attempt the impossible to stop it from ever happening again.

    [A story like this has been told before, in many different ways by many different people. Even so, I hope you enjoy it. Please know all major canon timelines and the music of Undertale before reading for the best experience.]

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

    Series
    Language:
    English
    Words:
    730,840
    Chapters:
    84/84
    Comments:
    2
    Kudos:
    17
    Bookmarks:
    2
    Hits:
    282
  4. 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:
    1,734
    Chapters:
    1/2
    Comments:
    2
    Kudos:
    9
    Hits:
    81
  5. 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-???

    Series
    Language:
    English
    Words:
    153,007
    Chapters:
    28/?
    Collections:
    1
    Comments:
    461
    Kudos:
    748
    Bookmarks:
    152
    Hits:
    13807
  6. Tags
    Summary

    It's the six month anniversary of the breaking of the barrier. Papyrus is up getting a midnight snack when he hears Frisk having a terrible nightmare. After he wakes her up, he gently encourages her to talk about it and Frisk reveals a truth that has been haunting her for six months.

    Mention of Neutral Route, no genocide.

    Series
    Language:
    English
    Words:
    4,472
    Chapters:
    2/2
    Comments:
    8
    Kudos:
    60
    Bookmarks:
    8
    Hits:
    733
  7. 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:
    13,917
    Chapters:
    13/?
    Comments:
    3
    Kudos:
    28
    Bookmarks:
    7
    Hits:
    531
  8. Tags
    Summary

    After 500 years of being underground, monsters have resurfaced and began to be introduced to humanity again. PTAs bring along two bitches that want monsters to go back to where they came from. Lets see how the monsters go in this new world.

    Language:
    English
    Words:
    10,693
    Chapters:
    7/?
    Comments:
    74
    Kudos:
    135
    Bookmarks:
    14
    Hits:
    3388
  9. Tags
    Summary

    After his timeline was destroyed along with almost everyone in it, the Sans who would come to be known as ‘Blue’ had an epiphany.

    Everything sucked. Like, all the time.

    It was not, perhaps, a new discovery, but it was the first time he had admitted it to himself. He had always tried to keep a positive attitude in life, even if his recent circumstances had put a sizable dent in his motivation.

    But still, he wouldn’t give up! As long as there were still monsters out there who could use his help, Blue would never give up.

    And so, stuck traveling the multiverse with a child and stuffed toy that were doing their best to kill him at every turn, Blue attempted to help prevent other universes from meeting the same fate as his - and perhaps make some new friends along the way!

    After all, just because life is hell doesn’t mean that he shouldn’t be cheerful about it!

    (in which Underswap Sans survives a no-mercy timeline unlike any other, and ends up losing both his home and his ability to Be Chill™.)

    Language:
    English
    Words:
    65,418
    Chapters:
    60/60
    Comments:
    406
    Kudos:
    503
    Bookmarks:
    70
    Hits:
    5342
  10. Tags
    Summary

    Frisk didn't expect anyone to help. They didn't expect to grow attached to two friendly brothers, and they certainly didn't expect finding a deeply-coveted secret.

    But, since when were they right about anything?

    Language:
    English
    Words:
    16,502
    Chapters:
    5/?
    Comments:
    32
    Kudos:
    57
    Bookmarks:
    8
    Hits:
    524
  11. 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:
    87,029
    Chapters:
    14/?
    Collections:
    1
    Comments:
    237
    Kudos:
    242
    Bookmarks:
    49
    Hits:
    4595
  12. Tags
    Summary

    Everyone is free.
    Everyone can be happy.
    Right?
    ....
    Heh.

    Language:
    English
    Words:
    4,819
    Chapters:
    7/?
    Comments:
    12
    Kudos:
    88
    Bookmarks:
    5
    Hits:
    1574
  13. 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:
    4,670
    Chapters:
    2/?
    Comments:
    2
    Kudos:
    28
    Bookmarks:
    7
    Hits:
    270
  14. Tags
    Summary

    Papyrus found a new holiday, something the humans call Father's Day and he knows just who to celebrate it with.

    Language:
    English
    Words:
    1,261
    Chapters:
    1/1
    Comments:
    16
    Kudos:
    59
    Bookmarks:
    3
    Hits:
    218
  15. Tags
    Summary

    Long ago, there was a war between humans and magical beings. These creatures were called monsters. Peace between them never existed. It was never accomplished.

    How were humans supposed to live with beings capable of turning into flames? Summoning spears? Controlling electricity? Becoming skeletons?

    Like hell they were going to let them any where near them! They will never be considered humans, nor will they ever have peace with them.

    However, the monsters adapted and made a civilization of there own. No humans would enter their world. Any human that does will die! Those vermin couldn't love and had taken their freedom away from them. Peace will never be considered ever again.

    Leave it to Frisk to change all of that. They were determined!

    Although, no one knew if this was for the best or the worst.
    .

    .

    .
    Even the author doesn't know because she is very tired and inconsistent.

    Language:
    English
    Words:
    2,301
    Chapters:
    1/?
    Comments:
    7
    Kudos:
    5
    Hits:
    50
  16. Tags
    Summary

    A series of snapshots of the Skele-Fish family detailing bits and pieces of their lives from before in the "Degrees of Heat" series.

    Scene 1: Royal Guard Business (Paps camps outside Undyne’s so he can join the Royal Guard) ((Plot twist: He doesn’t.))
    Scene 2: The Sixth Soul [Justice] (Something happens to Undyne’s phone, there’s a human, Paps thinks Undyne just lost her phone, Sans thinks Undyne’s been killed by the human (who does have an lv) and decides to take matters into his own hands)
    Scene 3: Judge, Jury and Executioner (The newly appointed Judge meets the Executioner. It’s much more awkward than it should be)
    Scene 4: A Choice (The Skele-Fish family individually think about the Human and how to go about this new addition to the Underground)

    Series
    Language:
    English
    Words:
    2,852
    Chapters:
    1/1
    Comments:
    5
    Kudos:
    18
    Hits:
    244
  17. Tags
    Summary

    The first time Gaster hits Sans is directly after Sans awakes for the very first time. He blinks awake to the cold, sterile lights above him and is promptly backhanded across the face.

    "You are SN-5," comes a cold voice from somewhere off to his right. "You are my experiment, and you will do as I say. Get up."

     

    Sans doesn’t grow up in a very happy environment. Neither does Papyrus. Fortunately they have each other.

    Language:
    English
    Words:
    2,377
    Chapters:
    1/?
    Comments:
    5
    Kudos:
    18
    Bookmarks:
    2
    Hits:
    205
  18. Tags
    Summary

    Coffee. Wine. Bed. SLEEP

    I only see a few Fellswap-gold fanfic here sooooooo.......
    Fellswap-gold rightfully belongs to Blackggggum

    Series
    Language:
    English
    Words:
    1,060
    Chapters:
    1/1
    Comments:
    7
    Kudos:
    22
    Bookmarks:
    2
    Hits:
    147
  19. Tags
    Summary

    After a long foreseen civil conflict finally comes crashing through monster society, an eight-year-old Sans and four-year-old Papyrus are left to fend for themselves. After nearly a year, stress is building up, and Sans is realizing they're not going to be able to survive the Underground on their own for forever. But what can he do, when he can't trust anyone but himself and his only family?

    Keep Paprus safe on the shoreline and throw himself into the icy, unknown waters first.

    Language:
    English
    Words:
    7,716
    Chapters:
    2/?
    Comments:
    6
    Kudos:
    41
    Bookmarks:
    8
    Hits:
    429
  20. Tags
    Summary

    Plot Twist: The reason why Sans is so salty is because Undyne stopped taking out time for the skelebros after she became Captain, but bothered to take out time for both Alphys and Frisk.

    (Sequel to Burning In Hell and Warmth of the Soul)
    (Part of the Degrees of Heat series)
    ((READ THE TAGS!!))

    Series
    Language:
    English
    Words:
    2,009
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    39
    Bookmarks:
    1
    Hits:
    555

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