1 - 20 of 2,416 Works in Ecto-Genitalia (Undertale)

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  1. Tags
    Summary

    Even after Error seems to have forgotten nearly everything of his past life with Reaper, the soul always seems to retain those longings and desires, and hopes to act on them, especially while asleep. Reaper's soul is quick to reciprocate.

    Series
    Language:
    English
    Words:
    1,490
    Chapters:
    1/1
    Kudos:
    10
    Bookmarks:
    1
    Hits:
    68
  2. Tags
    Summary

    Nightmare will do everything in his power to get what he wants, even if it means crossing the line.

    Language:
    English
    Words:
    20,038
    Chapters:
    3/?
    Comments:
    15
    Kudos:
    186
    Bookmarks:
    28
    Hits:
    2915
  3. Tags
    Summary

    Sans’ machine brings alternate versions of himself and his brother to their universe in a one-in-a-million chance. Unfortunately, you get flung into the madness when your soul is used as a conduit for the machine. Your soul cannot take the strain, and it inevitably snaps. A month later, while Sans is testing the machine, the machine uses the power of all of the monster souls in the house to bring you to this universe. Trapped in a different universe with a broken soul, you attempt to keep your secrets bottled up. Little do you know; your skeletal roommates have many secrets of their own. Pulled away from everything you’ve ever known, unable to use magic, and your soul broken, you find yourself questioning if all of this will just keep getting worse.

    Language:
    English
    Words:
    30,685
    Chapters:
    7/?
    Comments:
    8
    Kudos:
    30
    Bookmarks:
    7
    Hits:
    488
  4. Tags
    Summary

    just me being horny for sans. tw for suicide/self harm mention and me being absolutely down bad for a skeleton. may include plot but we'll see

    Language:
    English
    Words:
    870
    Chapters:
    1/1
    Kudos:
    4
    Hits:
    193
  5. Tags
    Summary

    “Whose idea was this again?” Killer asked, a wide grin on his face as he threw his jacket to the corner of Horror’s room, stretching out his arms to show off his bare humerus.

    “Mine,” Dust huffed out, keeping his hood on as he plopped onto a chair facing the large bed, “Now quit talking and get stripping.”

    ---

    So my friend Buu had this idea and I was like SAY LESS so here's some nice porn

    Language:
    English
    Words:
    1,666
    Chapters:
    1/1
    Comments:
    9
    Kudos:
    42
    Bookmarks:
    6
    Hits:
    212
  6. Tags
    Summary

    You were born in space, in one of the many Space Federation orbital colonies. You even spent most of your life in space, rarely stepping foot on actual planets. But you were determined to make the best of your life. You learned the ins and outs of nearly every ship still in circulation, honed your engineering skills to a fine edge. You were going to be the best you could! And maybe... Just maybe, find a place to really call home? Er, well... As long as you can keep within Federation rules.

    With all these skeletons though, this might be harder than you thought.

    Why is nothing working? Something hit the ship?
    You're gonna have to fix all this aren't you...? Here we go again.

    Language:
    English
    Words:
    46,750
    Chapters:
    13/?
    Comments:
    112
    Kudos:
    362
    Bookmarks:
    87
    Hits:
    6229
  7. Tags
    Summary

    The Underground was a dangerous place with the famine going on.

    Luckily your soulmate found you first.

    ___

    AKA: There's a lack of Horrortale Sans x Reader Underground Soulmate stories and I wanted more of that dark shit so I wrote it myself.

    Language:
    English
    Words:
    13,514
    Chapters:
    5/?
    Comments:
    67
    Kudos:
    248
    Bookmarks:
    56
    Hits:
    2077
  8. Tags
    Summary

    This is a swapfell/fellswap fontcest story.

    Papyrus works for a skeleton named Doctor River. Together, they were building soldiers for their queen. The experiments couldn’t hold their shape or become dust—all but one. However, it was far from perfect if you asked Doctor River. Papyrus would say something different.

    Language:
    English
    Words:
    3,259
    Chapters:
    3/5
    Comments:
    6
    Kudos:
    15
    Bookmarks:
    1
    Hits:
    143
  9. Tags
    Summary

    Where all the NSFW goes.

    Language:
    English
    Words:
    346,632
    Chapters:
    158/?
    Comments:
    294
    Kudos:
    1825
    Bookmarks:
    134
    Hits:
    70135
  10. Tags
    Summary

    Papyrus loves you, he really does.
    He hates how this is going, he didn’t ask for this, why was it like this?
    He just wants to love you and for you to love him. He begs any angel or star out there to hear his pleads, to protect them, to never take them from him.

    So… why after all he had done to keep it sweet, did it turn so sadistic?

    Language:
    English
    Words:
    2,299
    Chapters:
    4/?
    Kudos:
    17
    Bookmarks:
    6
    Hits:
    224
  11. Tags
    Summary

    A collection of drabbles requested from Tumblr and Ao3 comments. NSFW requests will have an addition to the title and a note at the beginning of the chapter for those who would prefer to avoid them. Content will be tagged by chapter.
    My Tumblr: vex-bittys

    Language:
    English
    Words:
    19,169
    Chapters:
    22/?
    Comments:
    142
    Kudos:
    291
    Bookmarks:
    24
    Hits:
    6690
  12. Tags
    Summary

    She wanted nothing more to be at peace, to be "safe" finally but she never could because her heart was too big for her own good. Gave everything to everyone until she was beyond repair...then one day, "they" found her broken.

    Language:
    English
    Words:
    82,087
    Chapters:
    54/?
    Comments:
    379
    Kudos:
    248
    Bookmarks:
    46
    Hits:
    7532
  13. Tags
    Summary

    Years ago, there existed a game/fandom known as "Undertale." People adored this game and they even made alternate universes based on it.
    Unfortunately, one day everyone just...forgot about it; like the game never was programmed in the first place. Even the creator of the game itself -Toby Fox- didn't remember it.

    Flash forward a few months, and you found a notebook while cleaning out your basement. The notebook contained a fantastical world and little doodles of characters that seem...oddly familiar to you. It took you a few weeks for you to recall everything, but you eventually did.

    A couple of weeks later, Nightmare and his group attacked your world and started a massacre. Country by country, they went around killing everyone. Once they got to your country, you managed to strike a deal with Nightmare.
    In exchange for your safety, you would give him information about all the Sanses you knew. Oh, and you have to provide...services to him and his gang of misfits.

    But hey, maybe this can work out in your favour?

    (a bad sans x fem!reader fic)

    Language:
    English
    Words:
    11,467
    Chapters:
    2/?
    Comments:
    18
    Kudos:
    88
    Bookmarks:
    24
    Hits:
    865
  14. Tags
    Summary

    Each chapter will have a list of kinks as well as the pairing for that chapter. Tags for the collection will change as new chapters are added. Enjoy!

    Language:
    English
    Words:
    13,470
    Chapters:
    12/35
    Comments:
    72
    Kudos:
    368
    Bookmarks:
    34
    Hits:
    14414
  15. Tags
    Summary

    TW: do not read if you are triggered by dark tropics

    Luka dad had enough of their shit and sent them to a private room school

    will come up with shit later

    Language:
    English
    Words:
    145
    Chapters:
    1/?
    Hits:
    8
  16. Tags
    Series
    Language:
    English
    Words:
    35
    Chapters:
    2/?
    Comments:
    4
    Kudos:
    12
    Bookmarks:
    1
    Hits:
    273
  17. Tags
    Summary

    Kinktober 2021 is here, and so are some horny skeleons!
    --
    the reader can be male, female or unspecified (based on the chapter you are reading of course) :D
    -
    There is absolutely no rape or dub-con, there may be con-noncon.
    --
    All the characters are based on my versions, such as the 'home for lost souls' boys or the 'a tyrant and an addict'. even the AU's that aren't in the canon story line of either of them, because this is a spin off series and not at all canon to my previous works.
    not only kinktober but also any short sexy time works i make as well.

    Language:
    English
    Words:
    19,477
    Chapters:
    17/?
    Comments:
    39
    Kudos:
    270
    Bookmarks:
    33
    Hits:
    12419
  18. Tags
    Summary

    when helping error get over his haphephobia, things get a little out of hand

    Language:
    English
    Words:
    5,106
    Chapters:
    1/1
    Comments:
    2
    Kudos:
    37
    Bookmarks:
    1
    Hits:
    184
  19. Tags
    Summary

    When y/n takes on a risky dare the last thing they expect was to have sex with one of their hot skeleton neighbors, even less so to make a deal; they stay and bang the skeletons during their heat, and the skelebros provide a home, food, etc now they are living with 8? skeletons fighting for their soul

    FEEL FREE TO REQUEST ANY SCENES YOU WANT TO SEE

    Language:
    English
    Words:
    2,342
    Chapters:
    1/?
    Comments:
    3
    Kudos:
    3
    Hits:
    94
  20. Tags
    Summary

    This one-shot thing is just me being super horny and bored. I have ideas but you can leave requests or suggestions in the comments for scenarios and kinks you want me to add!

    Language:
    English
    Words:
    963
    Chapters:
    2/?
    Comments:
    5
    Kudos:
    31
    Bookmarks:
    4
    Hits:
    3046

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