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  1. 40

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    Summary

    You are a hopeless romantic.

    So you’re absolutely giddy with delight when you find your soulmate. Your perfect half. Your fated match.

    So you try to convince yourself that he’s not pulling away from you, that he just needs to adjust to your level of loving someone. But after weeks of being ignored and neglected, you can’t help but feel rejected.

    So when you meet your soulmates lookalike who keeps showing you all this attention, you can’t help but feel confused, and a little bit flattered. You feel guilty for spending more time around this lookalike, but it’s not like your soulmate would even notice.

    Would he?

    Language:
    English
    Words:
    16,519
    Chapters:
    11/?
    Comments:
    280
    Kudos:
    237
    Bookmarks:
    40
    Hits:
    2,810
  2. 10

    Tags
    Summary

    One moment you were on the call with your friend, the next you are in a shady dark alley, pressed by... a crocodile with fedora?

    Life is confusing, and you have no damn idea where you even are and what will come next.

    Language:
    English
    Words:
    65,322
    Chapters:
    7/?
    Comments:
    45
    Kudos:
    64
    Bookmarks:
    9
    Hits:
    906
  3. 34

    Tags
    Summary

    You are a Normal Person.

    You wake up.
    Brush your teeth.
    Comb your hair.
    All that jazz.

    One day, you do the same thing.
    On that same day, you don't notice that an Insanely huge skeleton has tumbled out of your closet.

    Amazing.

    Language:
    English
    Words:
    11,894
    Chapters:
    5/?
    Comments:
    11
    Kudos:
    169
    Bookmarks:
    35
    Hits:
    1,993
  4. 38

    Tags
    Summary

    Sans wasn’t a deep sleeper. Grillby had been told this by Papyrus many a time, once the taller brother had realized just how often Sans had started sleeping at Grillby’s bar. The fact was a bit contradictory to the way the skeleton was always out cold even during the loudest, busiest rushes. Papyrus had let the flame know, when Grillby asked on one of his many trips to pick up his sleeping brother, that while he didn’t sleep deeply, he was still lazy, and would just lay as if still sleeping, “PROBABLY IN THE HOPES OF FALLING ASLEEP! THAT’D BE A VERY ‘SANS’ THING TO DO.” Grillby had agreed; Sans did in fact do that, sometimes more obvious than others.

    After a particularly restless nap, Grillby offers Sans to go upstairs and rest. Sans accepts gratefully.

    Language:
    English
    Words:
    3,006
    Chapters:
    1/1
    Comments:
    9
    Kudos:
    270
    Bookmarks:
    38
    Hits:
    1,803
  5. 35

    Tags
    Summary

    Cross is in heat, and like the stoic, chivalrous, idiot he is has decided to lock himself up in the dungeons to "keep you safe". We all know how this is gonna end though.

    Language:
    English
    Words:
    5,824
    Chapters:
    1/1
    Comments:
    13
    Kudos:
    322
    Bookmarks:
    35
    Hits:
    4,564
  6. 18

    Tags
    Summary

    You were finally getting your life back on track. Juggling college courses and a new job, you were slowly but surely rebuilding from the ground up, convinced the worst was behind you. That all changes when a magical summons you can't refuse rips you from your world and drops you into a house filled with powerful, skeletal monsters who despise you before you’ve even said a word.

    To them, you are the arrogant and careless human who shattered the soul of their dearest friend, the gentle mage Lyra. They see you not as a person, but as a living tool—a magical "key" they require to heal the damage you supposedly caused. Trapped in a multiversal nexus with no way home, you must navigate a gauntlet of relentless animosity and suspicion.

    Every word you say is twisted, every action is judged through the lens of lies you don't even know have been told. How can you survive in a home that isn't a home, surrounded by enemies who believe they are the heroes? And how can you prove your innocence when the true manipulator is the very person they've sworn to protect?

    Language:
    English
    Words:
    53,738
    Chapters:
    19/50
    Comments:
    59
    Kudos:
    96
    Bookmarks:
    19
    Hits:
    1,168
  7. *

    Tags
    Summary

    What had Ink tried calling him again?
    Someone named Killer?
    As fitting as that name would have been for the previous owner of his body, he clearly remembered that he had been referred to as 'Sans' in the blurred bits of memories.
    Maybe he was being mistaken for someone else.
    He hopes he never meets this actual 'Killer', but even if they were some sort of shady person- skeleton- thing, that doesn't excuse kidnapping a stranger and chaining them to the floor of your home after nearly killing them!
    With the most unimpressed expression he could muster, Quill forced the aching phalanges of his right hand into a wrist-up fist, and extended his middle finger.

    i.e. A self-indulgent crack-treated-seriously fic featuring isekai!Killer vs. the Multiverse. Enjoy!

    Series
    Language:
    English
    Words:
    33,397
    Chapters:
    21/?
    Comments:
    582
    Kudos:
    1,009
    Bookmarks:
    236
    Hits:
    18,610
  8. *

    Tags
    Summary

    A great source of despair draws Nightmare to an abandoned AU. There he finds an unfinished Sans with no name, no companions, no purpose, no world, and a soul. Nightmare gives him the option to get out of his abandoned, empty world. He accepts the offer but refuses to destroy anything or hurt people. Instead he finds another purpose. In return the Bad Sanses give him a home, companions, a life, and a name. They call him Ink.

    Or: Before he can destroy his soul and enter the Doodle Sphere, Ink is recruited by Nightmare. He accepts his role as best he can, even if he sometimes feels like he is meant for something more.

    Language:
    English
    Words:
    491,755
    Chapters:
    50/50
    Collections:
    12
    Comments:
    12,325
    Kudos:
    8,229
    Bookmarks:
    1,186
    Hits:
    308,234
  9. 12

    Tags
    Summary

    Imagine if the person who fell to the UNDERGROUND wasn't Frisk? What if it were someone completely different, someone in control of not only their choices, but their powers as well? Meet Grace, a young adult who just happened to be walking through the woods the same day Frisk decided to fall. Grace managed to SAVE Frisk from their usual fate, but only in exchange for hers; Grace falls down into the UNDERGROUND. As she makes friends and walks through the UNDERGROUND, read to see how a different character might have made her decisions on the same path an innocent child took - and how she might ruin it.

    Language:
    English
    Words:
    107,130
    Chapters:
    29/42
    Comments:
    28
    Kudos:
    79
    Bookmarks:
    12
    Hits:
    2,069
  10. 11

    Tags
    Summary

    A long time ago... humans and monsters lived in harmony. Until war broke between the two races.

    The humans were victorious and sealed monsterkind deep underground with a powerful spell, that could only be broken with the power of seven human souls.

    This was the tale of Mt. Ebott, and the tale trascended into legend. Those who climbed the mountain, weren't seen again.

    And so, begins the tale of the fifth human soul to fall into the land of legend, to fall... into the Underground.

    This is the tale of the Purple Soul... Sunny Suzuki.

    Language:
    English
    Words:
    68,660
    Chapters:
    21/?
    Comments:
    59
    Kudos:
    64
    Bookmarks:
    11
    Hits:
    2,788
  11. 67

    Tags
    Summary

    Papyrus is mourning, though he knows his lover is not dead. Only missing.

    He’s only missing them to the point of wanting to rip his soul out.

    ——

    You are not a person.

    But perhaps a certain skeleton can make you one.

    —————————

    Or, reader is a shapeshifter that feeds off of love who hoodwinks Papyrus into thinking they’re his child. Does it count as found family if you stalk them first?

    Series
    Language:
    English
    Words:
    29,115
    Chapters:
    11/?
    Collections:
    1
    Comments:
    242
    Kudos:
    258
    Bookmarks:
    67
    Hits:
    3,849
  12. *

    Tags
    Summary

    You always had a knife, for every reset, every journey through the Underground. Just because you didn’t kill anybody with it, doesn’t mean you didn’t use it.

     

    (Being rewritten. Posted under same title under my works!)

    Language:
    English
    Words:
    73,915
    Chapters:
    28/?
    Comments:
    1,378
    Kudos:
    3,370
    Bookmarks:
    415
    Hits:
    74,123
  13. 3

    Tags
    Summary

    Sunny ran out of his home due to a certain accident
    He didn't intend for things to come to this
    He ran to the lake, but because it was pitch black outside, he got lost in the woods only to end up on the cliff inside a mountain.
    He was still thinking it was a nightmare so he jumped so he could wake up in the arms of Mari calming him down like any bad realistic dream
    He always had
    Unfortunately, it was the beginning of his worst nightmares

    Btw English is not my first language
    I should clear that out again after ehs

    https://discord.gg/eKR9u7NvM
    comic uploads semi weekly maybe more maybe less and art since its pain in the ass to post here
    The comic will have a different route than this one

    Language:
    English
    Words:
    20,976
    Chapters:
    12/?
    Comments:
    35
    Kudos:
    36
    Bookmarks:
    3
    Hits:
    1,016
  14. 17

    Tags
    Summary

    Deep within the belly of the Omega Timeline rests the Underground.

    Not to be mistaken with the Underground— the forced sanctuary settled beneath mountain top: The setting for a story told many a time. No. Deep within the churning, hollow soul of the Omega Timeline rests the True Underground.

    And, nestled deep within the pit of this chasm, rests a fight club.

    Palette knows it as his second home.

    Or: Hidden deep within the Omega Timeline, there exists a fight club and black market. Years ago, a sick doctor created life from little more than abandoned magic. Gradient escapes. Palette waits. Dream is faced with echoes of his past. Ink claws for his identity. And, Nightmare steps into the light once more.

    Series
    Language:
    English
    Words:
    89,990
    Chapters:
    6/16
    Comments:
    63
    Kudos:
    62
    Bookmarks:
    17
    Hits:
    1,741
  15. 14

    Tags
    Summary

    After returning from a solo mission, Cross has a minor teleportation mishap, so now he's stuck in Nightmare's closet and he's forced to watch Nightmare dish out a special punishment to Killer.

    Language:
    English
    Words:
    3,260
    Chapters:
    1/1
    Comments:
    3
    Kudos:
    86
    Bookmarks:
    14
    Hits:
    1,405
  16. 83

    Tags
    Summary

    You should’ve never agree to go cave exploring with your group of friends. Yet you did, and look at where you are now! Way underground, trapped in a place with hungry bloodthirsty monsters. Thankfully your three best friends have your back.

    However, there’s not much they can do when you somehow catch the eye socket of two very dangerous and very deranged skeletons.

    Language:
    English
    Words:
    14,582
    Chapters:
    7/?
    Comments:
    118
    Kudos:
    415
    Bookmarks:
    83
    Hits:
    6,756
  17. *

    Tags
    Summary

    Everything seemed fine. Sans was fine. He told himself that every day. And he was almost convinced...almost.

    Language:
    English
    Words:
    90,197
    Chapters:
    22/22
    Comments:
    1,139
    Kudos:
    3,197
    Bookmarks:
    332
    Hits:
    83,441
  18. *

    Tags
    Summary

    Last I checked I had just gotten home from work. Now I'm sitting on the floor in some musty basement and- IS THAT SANS THE SKELETON?

     

    Basically isekai but Undertale +AU friends. Oh yeah also it's reverse harem. Aka a fic that's been done before. A bunch. (Whoops)
    Buuuuut, it has my own spin and my own (obviously hilarious) humor to it :)

    Also yes I have both Swapfell and Fellswap. And yes, they are two separate AUs. Swapfell is more like Underswap, and Fellswap is more like Underfell. (Swap doesn't look like a word anymore.)

    !!ERRATIC UPDATES!!

    Language:
    English
    Words:
    35,370
    Chapters:
    12/?
    Comments:
    287
    Kudos:
    566
    Bookmarks:
    130
    Hits:
    10,297
  19. 66

    Tags
    Summary

    After Killer and Nightmare have a small disagreement, Killer is determined to win the bet he placed.

    To do that, he must swap places with the original Sans for a day.

    or

    Killer struggles to realize hes not an original Sans anymore while Sans struggles to keep up with Nightmares gang.

    Language:
    English
    Words:
    3,667
    Chapters:
    1/1
    Collections:
    1
    Comments:
    21
    Kudos:
    294
    Bookmarks:
    66
    Hits:
    1,844
  20. 2

    Tags
    Summary

    Your (asshole) of a friend Malissa is getting tired of you being "boring". Things change when sweet little y/n meets some skeletons that might just change her life for the better.

    Language:
    English
    Words:
    1,279
    Chapters:
    1/1
    Kudos:
    5
    Bookmarks:
    2
    Hits:
    29

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