1 - 20 of 435 Bookmarked Items in Big Brother Sans (Undertale)

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  1. 57

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    Summary

    Abandoned on Mt. Ebott at the tender age of five, young Harry's unsurprisingly died, but Death's always had a weird relationship with his variant... Meanwhile, before Flowey's revival as souless talking flower, Sans makes a discovery under the mound of snow, Papyrus has always wanted to be a big brother anyways.

     

    *Edited Summary (29/09/2025)

    Series
    Language:
    English
    Words:
    86,627
    Chapters:
    24/?
    Comments:
    57
    Kudos:
    127
    Bookmarks:
    58
    Hits:
    3,546
  2. *

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    Summary

    Papyrus hadn't been worried! ...Well. Maybe he had been, just a bit.

    It'd been a while since anyone had heard from the human, so he called to check on them. But when a conversation revealed just how young they were, he realized things had to change. They were all on their own down here. And... They had nowhere to go.

    Well! If there was no one else to take care of the baby bones, Papyrus would just have to do it himself!

    Sans was trying to get through life and ignore the apathy that had settled over him for Papyrus’s sake. It was just so hard to care about anything when he knew none of it mattered. But when Papyrus had him bring the anomaly home like a lost puppy, things stopped adding up.

    How could such a sweet kid be responsible for the relentless time loops?

    Frisk was used to being on their own, and they were pretty good at taking care of themself. But—Well. ...Dying hurt. They just wanted to get back to the surface! With Undyne in the way, they were hopeless.

    So when a phone call from Papyrus somehow ended with an offer for them to crash at his house, Frisk could only be relieved for the break.

    They could afford to rest for a while, right?

    Series
    Language:
    English
    Words:
    169,232
    Chapters:
    33/43
    Comments:
    2,106
    Kudos:
    1,949
    Bookmarks:
    460
    Hits:
    73,111
  3. 8

    Tags
    Summary

    In an experimental run, Flowey was worried Toriel would convince a fallen human to stay with her in the Ruins. Flowey was struggling to find a way to prevent this.

    Luckily, a very “agreeable” skeleton friend of his might be able to convince her, but they’d need to target her kind nature somehow.

    Or

    Papyrus suddenly disappears. He’s in the Ruins with Toriel (due to unfortunate circumstances), but his other friends don’t know that.

    Takes place pre-pacifist route!

    Language:
    English
    Words:
    15,724
    Chapters:
    5/9
    Comments:
    30
    Kudos:
    57
    Bookmarks:
    8
    Hits:
    627
  4. 5

    Tags
    Summary

    THE GREAT PAPYRUS PROBABLY DOESN'T NEED FOOD!

    ...probably being the keyword there.

    But it's an experiment! A very scientific, very important experiment! And it has absolutely nothing to do with how disgusted food makes him feel!

    Sans can't know about it. It's not that he doesn't trust him, no. It's just that Papyrus knows Sans wouldn't like the idea of his brother trying not to eat for a whole month.

    or

    Eating never came easy for Papyrus. The taste, the texture, the strange disgust that followed... none of it made sense. But when he hears skeletons might not need food at all, something inside him clicks.

    Language:
    English
    Words:
    3,812
    Chapters:
    2/?
    Kudos:
    29
    Bookmarks:
    5
    Hits:
    166
  5. *

    Tags
    Summary

    Frisk absorbs Sans' soul after an unintentional genocide run. In her grief, she resets to try to fix it and make everything right. However, things don't go as planned and she ends up in a violent version of the Underground. With Sans stuck in her head, she now has his magic to help them survive and escape. But Frisk is committed to sparing. It will be difficult to spare when everyone here wants to kill her. What will she and Sans do?

    Language:
    English
    Words:
    106,467
    Chapters:
    32/?
    Comments:
    138
    Kudos:
    472
    Bookmarks:
    112
    Hits:
    15,863
  6. 8

    Summary

    My very own Multiverse~

    Words:
    86,627
    Works:
    1
    Bookmarks:
    8
  7. 43

    Tags
    Summary

    Sans was their favorite person, Frisk decided.

    He was mean and jagged and swore like their human teachers always said not to, and Frisk decided that was just perfect.

    Language:
    English
    Words:
    233
    Chapters:
    1/1
    Comments:
    8
    Kudos:
    332
    Bookmarks:
    43
    Hits:
    1,760
  8. 68

    Tags
    Summary

    Papyrus knew something was wrong with his brother—people didn't drop their HP Cap for good reasons, after all. But last he'd checked it was much higher than ONE. With terror in his marrow and his brother staying stubbornly silent about whatever was going on, Papyrus decided it was time to call in the cavalry, because he would be damned if he stood back and watched his brother Fall Down and Dust without doing anything.

    OR

    Papyrus realizes that being on the Surface hasn't helped his brother's crippling depression, because his HP is still 1. So he decides to bring the others in on his brother's stats to try to help.

    Language:
    English
    Words:
    9,225
    Chapters:
    1/1
    Comments:
    20
    Kudos:
    281
    Bookmarks:
    68
    Hits:
    1,655
  9. 17

    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.

    {{EDITING AND REWRITING}}

    Language:
    English
    Words:
    9,610
    Chapters:
    4/?
    Comments:
    41
    Kudos:
    138
    Bookmarks:
    17
    Hits:
    1,821
  10. 25

    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:
    57
    Kudos:
    267
    Bookmarks:
    25
    Hits:
    1,594
  11. 47

    Tags
    Summary

    Neither of the bone brothers had planned on raising a child.
    They were good brothers, to each other and in general.
    But not dads.

    But sometimes children fall into your life, and you have to be not only a brother but also a bit more.

    Where a tiny human falls into the Underground, and two skeletons get an addition to their small family.

    Language:
    English
    Words:
    14,911
    Chapters:
    6/?
    Comments:
    66
    Kudos:
    290
    Bookmarks:
    47
    Hits:
    4,288
  12. 49

    Tags
    Summary

    Dust's life hasn't exactly been the greatest.

    It gets worse when a portal opens under a battleground and sucks him in, along with everyone else.

    The problems compound when his memories, out of everyone else there, are chosen to be played in movie form.

    So who brought the popcorn?

    Dust Sans story.

    Series
    Language:
    English
    Words:
    29,656
    Chapters:
    21/?
    Comments:
    51
    Kudos:
    313
    Bookmarks:
    49
    Hits:
    7,003
    • 03 Nov 2025

      Public Bookmark

      Bookmark Notes:

      Memoirs of a Murderer
      Clichely
      Summary:

      Dust's life hasn't exactly been the greatest.

      It gets worse when a portal opens under a battleground and sucks him in, along with everyone else.

      The problems compound when his memories, out of everyone else there, are chosen to be played in movie form.

      So who brought the popcorn?

      Dust Sans story.

      https://archiveofourown.org/works/34316251

    • 03 Aug 2025

      Public Bookmark

    • 23 Jul 2025

      Public Bookmark

    • 23 May 2025

      Public Bookmark

    • 15 May 2025

      Public Bookmark

  13. 39

    Tags
    Summary

    A memory from a past timeline compels Sans to try and stop Papyrus and Mettaton becoming a serious couple, with hilarious results!

    Language:
    English
    Words:
    17,809
    Chapters:
    9/9
    Comments:
    86
    Kudos:
    612
    Bookmarks:
    39
    Hits:
    11,414
  14. 26

    Summary

    Just some cute lil one shots with random aus and a kid reader :) any requests in the comments!

    Words:
    28,283
    Works:
    17
    Bookmarks:
    26
  15. 3

    Tags
    Summary

    Do you really think it's all a game? That there aren't consequences to your actions?

    Or

    Sans' thoughts after all those runs.

    Language:
    English
    Words:
    453
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    33
    Bookmarks:
    3
    Hits:
    375
  16. *

    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:
    2,002
    Kudos:
    2,516
    Bookmarks:
    481
    Hits:
    30,030
  17. *

    Tags
    Summary

    Frisk could feel Chara narrowing their eyes at them. "Seriously, can you please take that stupid bandanna off your head?" Chara sneered. "It makes you look ridicul-"

    "Mandanna," Frisk interrupted.

    “…excuse me?”

    "Mandanna. Not bandana."

    ”Are we seriously gendering the bandanna just because it has abs on it?”

    "Yup!"

    ”…I really wish that others were able to hear your sass.”

    "I don’t know, I kinda like the idea that you’re the only one getting to see this side of me." Frisk looked in the window of a house they were passing by, winking at their reflection in it. "Makes you special, doesn’t it?"

    ”I- Stop flirting with me. I’m a dead person’s voice in your head!”

    "No."
    ---
    A child falls into the Underground and discovers a world beyond their imagination. Between the monsters, the magic, and the power to undo their mistakes and make everything right, they find happiness in places they would have never imagined. But when things start to get difficult, will they have the strength they need to keep fighting? How much pain are they willing to suffer to make things right? How much are they willing to give up to reach their happy ending?

    Series
    Language:
    English
    Words:
    225,318
    Chapters:
    13/?
    Comments:
    317
    Kudos:
    410
    Bookmarks:
    106
    Hits:
    17,658
  18. 3

    Summary

    An original AU where every monster receives a special gemstone at the age of ten, a condensed crystallization of their own magic called Crysalith.

    In this universe, monster magic is far more potent than in most other AUs. The Underground overflows with excess magic, forming various types of magical gemstones (often referred as Mana Stones). This abundance of power is one reason their AU remains one of the few where the ancient Sages, now calling themselves the Wizarding World, have survived, while others have faded into extinction.

    Though Crysalith are not directly tied to a monster’s SOUL, they are bound to their magic. These gemstones act as magical catalysts, providing extra support. They aren't strictly necessary, but they're incredibly useful, serving as a kind of pressure valve to siphon off surplus magic so the monster doesn't overload.

    This practice is a deeply rooted part of monster culture, existing long before the Great War.

     

    For more lore visit my Tumblr:
    https://www.tumblr.com/kisatamao/791746988810059776/arcalithtale-master-post?source=share

    Words:
    86,627
    Works:
    1
    Bookmarks:
    3
  19. 49

    Summary

    My main Undertale fic, Hopes, Dreams, And DETERMINATION, and its side stories.

    Hopes, Dreams, and DETERMINATION is a mild AU of Undertale where Frisk has a little sister and Chara and Asriel were friends with Sans and Undyne before they died. This causes changes in this Undertale Universe as a whole, and Frisk does not have to go through her journey alone.

    This series also has a Gacha Club Ask Blog on Deviantart! https://www.deviantart.com/dragonsrule91/gallery/79070889/ask-hopes-dreams-and-determination Feel free to check it out and ask some questions of your own! There's a lot of extra content on there.

    Words:
    296,049
    Works:
    30
    Bookmarks:
    49
  20. *

    Tags
    Summary

    Two lost, sick skeleton children walk into a bar.

    Grillby wishes there was a punchline.

    Language:
    English
    Words:
    96,110
    Chapters:
    24/?
    Collections:
    1
    Comments:
    379
    Kudos:
    1,242
    Bookmarks:
    211
    Hits:
    21,703

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