1 - 20 of 167 Works in Ecto-Tentacles (Undertale)

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  1. Tags
    Summary

    As a necromancer, you’re used to suspicious stares and whispers of heresy from the townsfolk. It only gets worse after you’re killed and walk Ebott Empire as an undead skeleton. When you hear rumors of a strange settlement that worships the undead, it’s too tempting to resist. The locals treat you better than you’ve ever been treated. That is, right until the moment where you’re dressed up and tied to an altar as a sacrificial bride for their skeleton gods.

    Despite their advanced technology and magical prowess, you’re doubtful of their divinity. What kind of gods blush whenever they see a bit of bone?

    Language:
    English
    Words:
    218,832
    Chapters:
    47/?
    Comments:
    1,150
    Kudos:
    2,350
    Bookmarks:
    476
    Hits:
    79,416
  2. 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:
    225,104
    Chapters:
    77/?
    Collections:
    1
    Comments:
    2,072
    Kudos:
    1,809
    Bookmarks:
    309
    Hits:
    51,653
  3. Tags
    Summary

    Mermay 2025 NSFW Bingo. Prompts by Sku, Creator of Leviathantale.

    ⚠️ The Explicit warning is for porn.
    ⚠️

     

    Check out each Chapter summary for warnings ⚠️
    *Chapter 1 has bondage and tentacles. Pairing is Error/Ink/Blue
    * Chapter 2, Geno/Reaper, prompt Bites and Licks
    * Bites that cause blood
    * Excessive saliva
    * Chapter 3, rated for violence, against human Poachers.
    Pairings, the Leviathantale Shiver.

    Series
    Language:
    English
    Words:
    6,654
    Chapters:
    3/?
    Comments:
    7
    Kudos:
    56
    Bookmarks:
    6
    Hits:
    1,036
  4. Tags
    Summary

    A series of SFW + NSFW drabbles/oneshots relating to the Bad Sans Gang being gay and in love with each other.

    THIS CONTAINS MATURE ADULT CONTENT

    Language:
    English
    Words:
    38,670
    Chapters:
    52/?
    Comments:
    319
    Kudos:
    1,178
    Bookmarks:
    96
    Hits:
    33,181
  5. Tags
    Summary

    "I could smell ya from a block away. This is going to happen and it’s going to happen tonight. Ya can fight me, kick, scream, and tell me “no” all ya want if it will ease ya conscious.
    Ya can rest easy knowin’ that ya didn’t technically cheat on your husband because I wouldn’t take no for an answer. Call it a gift for your wounded pride.
    But I’m still gonna fuck ya. And you’re gonna cum for me."

    Language:
    English
    Words:
    23,299
    Chapters:
    10/?
    Comments:
    33
    Kudos:
    116
    Bookmarks:
    26
    Hits:
    3,967
  6. Tags
    Summary

    Sans and Red's semi-annual weekend bender in Space Vegas takes an unexpected turn.

    Or, the boys wake up in the aftermath of a hasty Space Vegas Wedding and consistently fail to make any wise decisions.

    Language:
    English
    Words:
    67,508
    Chapters:
    11/11
    Comments:
    259
    Kudos:
    147
    Bookmarks:
    49
    Hits:
    3,464
  7. Tags
    Summary

    Vera was an avid believer in the fantastical and magical till an experience in high school causes her to lose faith in magic for years till the appearance of monsters on the surface. Unaware of her abilities she summoned an apple from the tree of negativity and during a night of curiosity becomes corrupted by its power.

    After reawakening to look like a monster Veras life turns upside down till a friendly skeleton monster who often buys her flowers reaches out to become her closest friend. In befriending him she's thrust into a new world of monsters, racism, and the multiverse itself as she comes to find out her soul is trying to tie itself to the god of hopes and dreams.

    Language:
    English
    Words:
    22,160
    Chapters:
    7/?
    Comments:
    30
    Kudos:
    114
    Bookmarks:
    26
    Hits:
    2,795
  8. Tags
    Summary

    Не такое уж и далёкое, как может показаться, будущее. Люди азартно заменяют свои тела на бионические, вся жизнь проходит в виртуальном пространстве, а секс в реальности считается чем-то пошлым и отсталым, поэтому повсеместно то тут, то там начали появляться виртуальные секс-клубы, дающие тебе полную свободу в фантазии и самовыражении.
    Таким образом Ван Ибо и Сяо Чжань знакомятся, но Сяо Чжань не знал, что Ибо - приверженец "старой школы")

    Ксюше, которая завела однажды интересный разговор и тем самым вдохнула в слабенькую задумку жизнь.
    А также каналу "Бионическая Россия", откуда я черпала теорию и много всего интересного.

    Language:
    Русский
    Words:
    19,095
    Chapters:
    1/1
    Comments:
    18
    Kudos:
    103
    Bookmarks:
    6
    Hits:
    782
  9. Tags
    Summary

    I'm sorry if I'm taking so long, I want to make sure this sweet baby is well cooked and fucking delicious!<3 >:3c

    Series
    Language:
    English
    Words:
    2,783
    Chapters:
    2/3
    Comments:
    2
    Kudos:
    16
    Hits:
    865
  10. Tags
    Summary

    Cross gets a little carried away while Nightmare and Dream feed from him and the twins are determined to make their little puppy feel good. Killer is a little minx and comes running towards Cross' aroused scent, leading to Nightmare and Dream taking care of both of their wolves~.

    Language:
    English
    Words:
    5,840
    Chapters:
    1/1
    Comments:
    35
    Kudos:
    217
    Bookmarks:
    41
    Hits:
    1,934
  11. Tags
    Summary

    Y/n was a normal girl, born in to a wealthy family. She didn't have to worry about going hungry before bed, going to sleep with dirty clothes or worrying about the troubles of a commoner, as they call it, you'd think her life was perfect, but then why did it feel like it was missing something? She knew where she would end up one day, with a man who only viewed her as a trophy, forced to marry for the benefits it would bring her family, she didn't want that, she didn't want that at all! She wanted to be free, to experience what it's like to go hungry to bed, what it's like to live the life of struggle, as they say, grass is always greener on the other side, this path only led her to a group of certain dangerous skeleton monsters.

    Language:
    English
    Words:
    8,478
    Chapters:
    6/?
    Kudos:
    32
    Bookmarks:
    3
    Hits:
    833
  12. Tags
    Summary

    It’s a very… delicate time of year. Or so you’ve been told; you can’t say for certain that you’ve ever been around a monster during their Season. Your stay at Nightmare’s castle has certainly prepared you for all manner of strange and unusual occurrences, but this?

    This is a whole different beast.

    Series
    Language:
    English
    Words:
    24,927
    Chapters:
    4/?
    Collections:
    1
    Comments:
    143
    Kudos:
    495
    Bookmarks:
    106
    Hits:
    13,186
  13. Tags
    Summary

    After a rough break up with your cheating boyfriend, you meet a tall skeleton who helps you get back on your feet.

    Story is being recycled! New version is available!

    Language:
    English
    Words:
    11,673
    Chapters:
    10/10
    Comments:
    17
    Kudos:
    106
    Bookmarks:
    21
    Hits:
    3,285
  14. Tags
    Summary

    A story of a much different, darker timeline from:   Let It Burn

    This is going to be just as dark as Let It Burn was considering it's dealing with the same subject matter only with a different outcome at a pivotal point. That subject being; held hostage, rape (though never with explicit details, it'll be *vaguely* described when it happens), and the mental health recovery from that kind of trauma.

     

    This is an Underfell based fic.

    Series
    Language:
    English
    Words:
    79,182
    Chapters:
    11/?
    Comments:
    20
    Kudos:
    22
    Bookmarks:
    2
    Hits:
    1,169
  15. Tags
    Summary

    Red is a breeder for the Impostors, an alien race whose main goal is to create chaos and destroy other races while rebuilding their own. He happens upon a set of ships, sending his once-normal life into a spiral of uncertainty and...l...l...love?

    I mean, after he gets them all to fuck him, of course.

    Language:
    English
    Words:
    9,122
    Chapters:
    4/?
    Comments:
    43
    Kudos:
    199
    Bookmarks:
    30
    Hits:
    3,467
  16. Tags
    Summary

    //Life was amazing and nothing could change that for the now vice captain of the royal guards.//

    A continuation of 'enemies, but at what cost'

    Series
    Language:
    English
    Words:
    2,641
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    69
    Bookmarks:
    5
    Hits:
    1,381
  17. Tags
    Summary

    Fresh out of cryo, the human government has given you an important task. Join the Enterprise and befriend the Monsters on board, proving that humanity has changed from their bloody pasts. Or don't, it's up to you.

    Prove yourself better than the stereotypes or sink deeper into them, causing chaos or order. Save or destroy, love or fight.

    Language:
    English
    Words:
    2,055
    Chapters:
    2/?
    Comments:
    8
    Kudos:
    14
    Bookmarks:
    1
    Hits:
    272
  18. Tags
    Summary

    Swap, Fell, and Tale all have a relationship together. Everyone had sex with everyone....well at least everyone, Red never done the do with any of the lovers. Blue brought this to the attention of everyone, all filled with lust and rage they draw straws to see who will take Reds virginity.

    Language:
    English
    Words:
    3,135
    Chapters:
    12/12
    Comments:
    83
    Kudos:
    179
    Bookmarks:
    7
    Hits:
    7,471
  19. Tags
    Summary

    Two short oneshots of Fresh and fetish-y fun stuff

    Warnings that I couldn't find tags for will be in notes

    Also, this is mainly going to be for fem readers, apologies, but that's my only perspective "^^

    Language:
    English
    Words:
    681
    Chapters:
    1/2
    Kudos:
    90
    Bookmarks:
    8
    Hits:
    2,006
  20. Tags
    Summary

    Sans gives in to the temptation to paddle the pink canoe one night in an inappripriate venue and then pretty much just keeps making bad decisions. Papyrus is surprisingly onboard.

    Series
    Language:
    English
    Words:
    8,235
    Chapters:
    3/3
    Comments:
    75
    Kudos:
    198
    Bookmarks:
    22
    Hits:
    2,517

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