1 - 20 of 370 Works in Sans/Underfell Sans (Undertale)

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  1. Tags
    Summary

    Sure, being a pirate king sounds like the best shit ever, right up until you realize you have to live on a fucking boat.
    Red can’t explain how he ended up in this strange human world with his brother, much less became captain of their stolen ship full of stupid, dangerous humans conned along on their search for a place that doesn’t exist.
    But he has a few theories, and he does know one thing.
    Someone’s gonna fucking pay.

    Language:
    English
    Words:
    87,009
    Chapters:
    15/?
    Comments:
    224
    Kudos:
    116
    Bookmarks:
    23
    Hits:
    2884
  2. Tags
    Summary

    Sans was quite happy with his life : he was living on the surface, he didn't go through genocide routes, had a caring brother, good friends, no resets. Yes, he would have never changed his life for anything in the world. Then how did this happen?
    Kustard in the flowerfell universe!

    Warning : contains violence, violent deaths, violent languages, violent gestures, swearing and some smutty elements !

    Language:
    English
    Words:
    11,603
    Chapters:
    9/28
    Comments:
    4
    Kudos:
    12
    Bookmarks:
    1
    Hits:
    120
  3. Tags
    Summary

    Four AU’s have come to a happy ending on the surface. It is a new beginning for everyone, but Berry is haunted by his past that still clings to him and threatens to pull him back into the darkness, unknown to his now growing skeleton family. The newest skeletons are from the last set that surfaced: Fellswap. They are not going to let Berry be taken. Howl and Daemon, the two newest skeletons, have to dig into a horrible truth and show the world Berry’s past, and with the help of their fellow skeletons, they hope to make a better future for him and all other monsters.

    This is adapted from a role play with GetMcDunkedOn and me (Diyami). I hope you enjoy it.

    Series
    Language:
    English
    Words:
    188,947
    Chapters:
    29/?
    Comments:
    499
    Kudos:
    198
    Bookmarks:
    34
    Hits:
    6136
  4. Tags
    Summary

    I like to throw around concepts. Stories that are free to expand upon by whoever will have an info in the notes.
    If you just want to do a similar concept I don't care to much, as long as you come up with an own twist to it.
    Fair warning, I'm continuing what I feel like in no specific order, but continued stories will get links to the next chapter.

    Language:
    English
    Words:
    992
    Chapters:
    4/?
    Comments:
    1
    Kudos:
    13
    Hits:
    98
  5. Tags
    Summary

    Sans has some issues with his weight and isn't sure Red will still love him because he gained some. Red proves him very wrong ;3

    Language:
    English
    Words:
    4,932
    Chapters:
    3/3
    Comments:
    36
    Kudos:
    82
    Bookmarks:
    13
    Hits:
    545
  6. Tags
    Summary

    Prequel to Omega's Respite

    When the Underswap skeletons make it to the surface, Stretch is not at all impressed with the taller Fell brother. Sparks fly in between them, but can they sort out their differences and learn to appreciate each other?

    In the meantime, Sans is infatuated with his friend, the other Fell brother, Red. But Red is wrapped up in his own bad coping skills, and doesn't want anything more than a fuck buddy. How will Sans get Red to open up more and give real romance a try?

    Series
    Language:
    English
    Words:
    52,302
    Chapters:
    7/?
    Comments:
    80
    Kudos:
    33
    Bookmarks:
    5
    Hits:
    1033
  7. Tags
    Summary

    Dans le jour ,dans la nuit et dans le froid,
    Deux regards se croisent et,
    ne se quittent plus depuis la première fois.
    Une douce boucle chaleureuse,
    se créer,
    sans vraiment être aussi affreuse,
    qu'elle n'y parait.

    Language:
    Français
    Words:
    2,613
    Chapters:
    4/?
    Comments:
    4
    Kudos:
    2
    Bookmarks:
    1
    Hits:
    28
  8. Tags
    Summary

    Stretch was pretty used to waking up alone. But the day after being kidnapped? Not so much.

    Series
    Language:
    English
    Words:
    3,433
    Chapters:
    1/?
    Comments:
    14
    Kudos:
    69
    Bookmarks:
    3
    Hits:
    279
  9. 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:
    47,245
    Chapters:
    13/?
    Comments:
    44
    Kudos:
    110
    Bookmarks:
    22
    Hits:
    2071
  10. Tags
    Summary

    Once upon a time, a prince married a dragon to protect his kingdom…

    Now if only Red would stop talking about Sans’ good clutching hips and bringing him dead deer, happily ever after would be a little easier to figure out. Of course, nothing goes as planned for anyone, especially the well-meaning but confused knight that believes his childhood friend needs rescuing from a dastardly fiend.

    ClassicCherryBerry | That Arranged Marriage Dragon AU | Romantic Comedy

    Language:
    English
    Words:
    4,128
    Chapters:
    1/?
    Comments:
    34
    Kudos:
    189
    Bookmarks:
    51
    Hits:
    933
  11. Tags
    Summary

    If it wasn’t for the money, Sans would have thrown Grillby’s best customer out the window the day they had the misfortune of meeting.

    Mob Kustard | Slowburn | Pre-Relationship

    Series
    Language:
    English
    Words:
    6,250
    Chapters:
    3/4
    Comments:
    43
    Kudos:
    159
    Bookmarks:
    11
    Hits:
    1571
  12. Tags
    Summary

    Sanscest Oneshots (No errorink, cream, or killermare)

    Language:
    English
    Words:
    11,104
    Chapters:
    13/13
    Comments:
    2
    Kudos:
    27
    Bookmarks:
    3
    Hits:
    644
  13. Tags
    Summary

    In the aftermath of the kidnapping, Red has a few thoughts. There's a reason he's always called 'em liabilities.

    Series
    Language:
    English
    Words:
    1,752
    Chapters:
    1/1
    Comments:
    10
    Kudos:
    64
    Bookmarks:
    2
    Hits:
    415
  14. Tags
    Summary

    Papyrus hated his new life on the surface. There was so many rules and skeletons he wasn't use to and no one that he knew besides his brother. His brother that he wishes he can make amends with in this new safe haven of theirs, but isn't sure how. And why is this pitiful human he somehow made friends with through his glaring, so open to help him when his brother isn't? He just wanted to go home where everything was just a little bit simpler.

    Undertale belongs to Toby Fox and all the Undertale aus belong to their respected owners.

    Series
    Language:
    English
    Words:
    73,345
    Chapters:
    58/75
    Comments:
    275
    Kudos:
    123
    Bookmarks:
    27
    Hits:
    3028
  15. Tags
    Summary

    Sans vive en la Superficie, libre y feliz por primera vez desde que tiene memoria. Y entonces comienza a ver a otro monstruo extrañamente parecido a él en los espejos y en sus sueños. Cuando termina en una versión oscura del Subterráneo, Sans debe encontrar la manera de volver a casa, todo mientras intenta mantener las cosas complicadas y confusas -como las emociones- fuera de la ecuación.

    Escrito originalmente en el estilo de Catsitta de Drabbles Diarios de 100 palabras, con no más de 250 palabras por capítulo (en esta traducción pueden ser más). Es mejor si se lee en el modo Entire Work (Todo el Trabajo).

    Language:
    Español
    Words:
    5,680
    Chapters:
    42/?
    Kudos:
    4
    Hits:
    70
  16. Tags
    Summary

    Sans lives on the Surface, free and happy for the first time since he can remember. And then he starts seeing another monster who looks strangely like him, in mirrors and in dreams. When he ends up in a darker version of the Underground, Sans must find a way back home – all while trying to keep messy things like feelings out of the equation.

    Written in the style of Catsitta’s 100 Daily Drabbles, with no more than 250 words in a chapter. Best read in Entire Work mode.

    Language:
    English
    Words:
    5,278
    Chapters:
    42/?
    Comments:
    403
    Kudos:
    173
    Bookmarks:
    16
    Hits:
    2826
  17. Tags
    Summary

    Sans accepts to have a blind date with his brother's coworker's friend, except the monster in question is a total jerk and everything goes wrong. No way Sans will go on a second date with him.

    ...and yet.

    Series
    Language:
    English
    Words:
    12,847
    Chapters:
    3/3
    Comments:
    61
    Kudos:
    88
    Bookmarks:
    20
    Hits:
    577
  18. Tags
    Summary

    Some days feel just about perfect. And then there are days like the one Red is having.

    This is an AU crossover between two of Catsitta's stories, with all due blame and credit. It takes place at the end of Chapter 21 for Smoke in the Mirror and around the time of the first story in the Just Business series. If you haven't read them already, it would be best to start there.

    Language:
    English
    Words:
    12,797
    Chapters:
    3/3
    Comments:
    30
    Kudos:
    42
    Bookmarks:
    10
    Hits:
    464
  19. Tags
    Summary

    Red is no stranger to doing whatever it takes to stay alive. First Underground and now in this kill-or-be-killed city. He's done it all, from smuggling illegal goods to killing Don Dreemur's enemies on command, to carve out out a reputation for himself.

    So how in the Angel's name did this no LV piece of FreeExp come to be so close to Lady Dreemur and her kid?

    Mob!Kustard | Slowburn | Rating has risen

    Language:
    English
    Words:
    76,490
    Chapters:
    23/?
    Comments:
    363
    Kudos:
    820
    Bookmarks:
    135
    Hits:
    12668
  20. Tags
    Summary

    Mermaids are the social butterflies of the sea, living in sunny, shallow water together with the rest of their school. On the other end of the spectrum, meroctopuses are violent, antisocial fucks who like the cold and the dark, and who basically kill any competing predator they see.

    But they aren’t stupid.

    Red is proof of that, using his traps to hunt for food and saving his energy to ward off predators. So, how does he react when he finds the laziest creature in the ocean stealing his catch?

    Bribe him with more food in exchange for peaceful company, of course! The ocean is fucking lonely for giant predatory mer!

    Red unwittingly gets saved by those peaceful conversations. Apparently even a cold-hearted predator can fall in love. And from there, their family keeps growing as more lost souls are saved by the siren’s call that sings of peace, love, and family, no matter how terrible of a monster you were in the past.

    Language:
    English
    Words:
    143,851
    Chapters:
    47/?
    Collections:
    1
    Comments:
    1481
    Kudos:
    1227
    Bookmarks:
    213
    Hits:
    25149

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