1 - 20 of 1,648 Works in Ecto-Penis (Undertale)

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  1. Tags
    Summary

    Kinktober 2021-2022-2023 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:
    25,519
    Chapters:
    21/?
    Comments:
    46
    Kudos:
    343
    Bookmarks:
    36
    Hits:
    15896
  2. Tags
    Summary

    waking up on an island, all alone, nobody to help you.

    unbeknownst to you that an island full of skeletons would want to make you theirs, lived on the island that you thought had no lifeforms.

    you will have to decide if you want to stay with your skeleton boys, or find a way to help them to escape.

    Language:
    English
    Words:
    1,328
    Chapters:
    2/?
    Comments:
    4
    Kudos:
    15
    Bookmarks:
    3
    Hits:
    186
  3. Tags
    Summary

    In a world where females are scarce and the Monsters are so used to death a young woman is forced to help save them. Although she is not the only one that had been summoned, the weight of her duty is still heavy. Hopefully with a bit of time she will succeed in her given tasks but until then she needs to watch out for those around her. As Monster's of all sorts come to ask to be her mate some don't take rejections so well. Thank goodness though that she has a few helping hands. Well they would be considered helpful if they left her alone for five gosh darn minutes.

    Language:
    English
    Words:
    58,281
    Chapters:
    8/?
    Comments:
    101
    Kudos:
    415
    Bookmarks:
    99
    Hits:
    9026
  4. Tags
    Summary

    A found family, a cold case, and a child's custody.

    A shotgun wedding, a detention center, and the skeleton you married becoming your lawyer.

    You've checkmarked all six as things you would've never expected to be involved with, and with how it goes, you're certain you'll have a seventh one to add to your list.

    It's perplexing to remember it all began with you missing your stop after falling asleep during your train ride home.

    And as more days pass, you can't decide whether that's a good thing or not.

    Language:
    English
    Words:
    5,888
    Chapters:
    3/55
    Comments:
    4
    Kudos:
    60
    Bookmarks:
    10
    Hits:
    486
  5. Tags
    Summary

    Born a royal descendant of a fallen god whose prophecy was forgotten yet revived, you are to be sacrificed too fulfill it due to your monster-like appearance. Below the depths of the mountain pit you meet new creatures who welcome you in strange ways.

    Language:
    English
    Words:
    23,718
    Chapters:
    9/?
    Comments:
    2
    Kudos:
    49
    Bookmarks:
    13
    Hits:
    815
  6. Tags
    Summary

    50 Years has passed since Monsterkind was freed from Mt. Ebott by the young child, Frisk Dreemurr. Time has come and gone, Monsters were able to finally get full citizenship after 20 years of pushing for it. Frisk is no more, due to dying in an accident. Yet with it, came the arrival of a strange set of skeletal tiny monsters.

    Bittybones.

    Evangeline O'Neal, or Ava, is a well known writer of a trilogy series simply known as An Undertale, under a different name. Is soon convinced by their oldest sibling to go and adopt a Bittybone, after learning a adoption center is opening up near where Ava lives.

    What she didn't know, is how Ava ends up meeting an interesting Corny Lamia that suppose to be as lazy and punny as any other one. Only to find out, that the skeletal snake, has a bigger secret she didn't even realize. Especially, when said Bitty, turns out to be her Soulmate.

    Language:
    English
    Words:
    83,617
    Chapters:
    14/30
    Comments:
    16
    Kudos:
    45
    Bookmarks:
    10
    Hits:
    579
  7. Tags
    Summary

    With his new life hitting harder each day, Sans begins to take less care of himself, and those around him start to notice – Frisk, the first of them all.

    Although, not wanting to go easy on him with how overwhelmingly lax and loafy he'd been with the whole 'protecting them through the Underground' promise, they wrangle him into a series of strange scenarios he would've never imagined himself partaking in, these sufficiently complex to both occupy his mind and push him into trying new things.

    The first one involves Frisk setting him up with their mother in a way he really should've seen coming, but unfortunately didn't – much to his ever-growing dismay.

    One date leads to another, and next thing he knows, he's kissing her in the janitor's closet at the basketball court he works for.

    Yeah, life's funny like that.

    Language:
    English
    Words:
    9,611
    Chapters:
    5/30
    Comments:
    11
    Kudos:
    68
    Bookmarks:
    11
    Hits:
    632
  8. Tags
    Summary

    Error's suffering through a bad heat in his anti-void. Lust knows just how to take care of him.

    Language:
    English
    Words:
    2,803
    Chapters:
    1/1
    Comments:
    4
    Kudos:
    45
    Bookmarks:
    2
    Hits:
    406
  9. Tags
    Summary

    Sans, Papyrus and their Pet had settled into a nice life underground, despite the Queens harassment and the bleak outlook all monsters had on life. They were in a world they knew how to navigate, one they held rank and power in. Not safe but safe enough. It wasn't the worst life to live while they waited for the last soul to get out of this hellhole.

    The universe has a funny way of granting wishes, doesn't it?

    -----

    Bare with me while I find my footing and be sure to leave feedback if something bothers you!

    Language:
    English
    Words:
    26,057
    Chapters:
    7/?
    Comments:
    52
    Kudos:
    169
    Bookmarks:
    55
    Hits:
    3347
  10. Tags
    Summary

    Years after the monsters are released from Mount Ebott, humans are still struggling with this change and accepting them into society. With tensions growing on either side, Y/N a young man who's a sloppy drunk is thrown head first into the fray when a certain skeleton helps him after a nightly blackout. Will he find love and family in the chaotic household he's introduced to or will his tumultuous past and addictions stop him from finding happiness?

    Language:
    English
    Words:
    47,561
    Chapters:
    11/?
    Comments:
    132
    Kudos:
    252
    Bookmarks:
    41
    Hits:
    3998
  11. Tags
    Summary

    Pain. Helplessness. Despair. Loneliness. Rage.

    These emotions were all you ever knew while growing up in the pit of hell you were cursed to call your 'home'. Deprived of one's basic needs, never knowing the warmth of the sun on your skin or the scent of fresh air. What it means to be loved.

    Twenty long years of being locked away like a caged bird, used and abused yet always waiting for the moment that would finally allow you to spread your wings. However, no matter how much you struggled or fought back, hopelessness continued its cruel assault; making it impossible to find the key to your freedom.

    Until one day.. an opportunity arises when a certain someone makes the difficult decision to aid you in your escape, taking a risk that unfortunately came with a hefty price.

    Language:
    English
    Words:
    16,740
    Chapters:
    3/?
    Comments:
    6
    Kudos:
    63
    Bookmarks:
    13
    Hits:
    736
  12. Tags
    Summary

    Sans is exhausted. He is lonely, hurting, and only two steps away from Falling Down.

    Underfell's first ever Gyftmas is approaching and Red is scrambling. He wants to get his brother the best present ever to celebrate, something that goes across resets with them.

    A visit to Undertale provides him with an idea. It's morally wrong, completely unethical, and likely illegal.

    Luckily for Red, he never really had a moral code.

    MIND THE TAGS.
    This story will get DARK. If anything, literally ANYTHING, looks triggering to you, please don't read this.

    On a brighter note, this is my first time writing smut! Please feel free to give me tips or tell me how I did!

    I also accept ideas for things to happen in the story.

    Language:
    English
    Words:
    8,031
    Chapters:
    3/?
    Comments:
    3
    Kudos:
    11
    Bookmarks:
    6
    Hits:
    188
  13. Tags
    Summary

    Sans tries to help Red kick his nailbiting habit.

    Things get out of hand.

    Language:
    English
    Words:
    3,931
    Chapters:
    1/1
    Comments:
    5
    Kudos:
    28
    Bookmarks:
    7
    Hits:
    278
  14. Tags
    Summary

    Between two part-time jobs, university, and a concerning lack of savings, finding a more serious relationship is the last thing on your mind. Too bad a certain Mutt doesn't seem to know how to take a hint.

    After a scene goes wrong at your favourite BDSM club, you find yourself growing closer to Grillby. Yet Mutt and M'lord seem unwilling to let you go so easily...

    -

    A shameless reader-MC fic, where a misunderstanding at the fetish club where you work as a bartender leads to sexy shenanigans with everyone's favourite SwapFell brothers, SwapFell Grillby (and a few more monsters on the way).

    -

    This PWP developed a lot of plot.

    Updated every Wednesday.

    Series
    Language:
    English
    Words:
    119,474
    Chapters:
    45/?
    Comments:
    587
    Kudos:
    1139
    Bookmarks:
    240
    Hits:
    28580
  15. Tags
    Summary

    Gaster runs some "tests" at his son's expense.

    Language:
    English
    Words:
    8,140
    Chapters:
    1/1
    Comments:
    21
    Kudos:
    39
    Bookmarks:
    4
    Hits:
    625
  16. Tags
    Summary

    You were a big fan of Undertale and a huge Sans simp, not the "I wIlL kIlL yOu" ones but the much calmer ones. One day you were invited into the Sans Au Group chat, how could you possibly pass that up?!

    Series
    Language:
    English
    Words:
    9,965
    Chapters:
    4/?
    Comments:
    31
    Kudos:
    134
    Bookmarks:
    24
    Hits:
    1502
  17. Tags
    Summary

    You die on the same day the world changes, interesting things start to happen.

    Language:
    English
    Words:
    16,177
    Chapters:
    9/?
    Comments:
    4
    Kudos:
    47
    Bookmarks:
    21
    Hits:
    432
  18. Tags
    Summary

    A collection of short drabbles I'd written for friends, to share on discord, or other places that I just feel like tossing on here now too. Some will get continuations as I feel like it, and some won't. Short descriptions and additional warnings if needed will appear at the top of each chapter.

    Come get your spicy, finger-licking treats y'all!

    Language:
    English
    Words:
    2,783
    Chapters:
    2/?
    Comments:
    5
    Kudos:
    48
    Bookmarks:
    1
    Hits:
    455
  19. Tags
    Summary

    After falling into the dreaded hole of Mt. Ebott, Chara and Frisk are taken in by Asgore and Toriel and raised alongside Asriel. Winning favor, and a little fear, with many of the king's subjects proved to be helpful in keeping the girls alive. Impressed with their abilities to fight, adapt, and survive, he decides to make them a subject of research and study in exchange for protection, shelter, and a family. Ten years have passed since and the girls are not only all grown up, but extremely fortunate to have survived for so long under the dangerous circumstances. With the Underground being full of rough, rowdy, hateful, but not necessarily evil monsters, how do they stay out of trouble? Their skeleton body guards of course. But things take an unexpected turn when love and lust are thrown in the mix.

    *Disclaimer: Undertale and all related characters belong solely to Toby Fox.

    Language:
    English
    Words:
    164,257
    Chapters:
    21/?
    Comments:
    39
    Kudos:
    93
    Bookmarks:
    14
    Hits:
    3575
  20. Tags
    Summary

    Context: Sans didn’t pay his tab on time and Grillby is sorta pissed so he takes revenge the best way he knows how, by teasing the hell outta sans >:D

    Language:
    English
    Words:
    1,725
    Chapters:
    1/1
    Comments:
    3
    Kudos:
    10
    Hits:
    223

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