1 - 20 of 745 Works in Ecto-Penis (Undertale)

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  1. Tags
    Summary

    You’re a college student studying to become an astronomer but you procrastinate too much but that doesn’t seem to affect your grades at all. You love to listen to music all the time, watch tv, have sex and sometimes Dj at a few parties. Your also a lazy son of a….anyway…your professor doesn’t seem to enjoy your behavior very much or it seems he’s been in a pissy mood since he’s gotten hired. You don’t care, you have other things to worry about in life.

    Series
    Language:
    English
    Words:
    86,578
    Chapters:
    33/?
    Comments:
    704
    Kudos:
    398
    Bookmarks:
    50
    Hits:
    11161
  2. Tags
    Summary

    You are Sentinel, a human involved with the monster mob for the last year of your life. It's taken that time to gain the trust of Boss, Undyne, Grillby, and the rest of the monsters, the only human included in their inner circle. But this only makes you a bigger target to the rival clans and mobs. Someone is working to force the monsters back to the Underground, the prison of their once and former King, and will stop at nothing to do it.

    You'd give your very Soul to keep it from happening.

    Updated daily.

    Series
    Language:
    English
    Words:
    3,516
    Chapters:
    4/?
    Comments:
    28
    Kudos:
    47
    Bookmarks:
    4
    Hits:
    440
  3. Tags
    Summary

    Basically a sinful roleplaying book for all your Fontcest, Sanscest, and Papcest needs.

    Language:
    English
    Words:
    2,031
    Chapters:
    20/?
    Kudos:
    5
    Hits:
    274
  4. Tags
    Summary

    Once long ago, humans and monsters lived alongside one another. During this time it was an age of unparalleled magic and strength in the two sides.

    However, the great war happened, and with the absence of monsters mages slowly died out. After all, humans are not inherently magical. With no more magic to keep the blood lines going, magic is all but a fantasy in the humans of today. That is, until an eccentric billionaire decides the mages need a come back.
    Looks like you and a few others are just the right subjects to get the ball rolling.

     Oh right! There is some swearing in here.

    *WARNING* Some people are very sensitive to kidnapping/abduction themes. While I assure you, I probably won't go too dark, it is a bit... muddy in here. Tread lightly.

     

    Updates: Alright, we're shooting for twice a month, SUNDAY UPDATES

    Language:
    English
    Words:
    61,665
    Chapters:
    22/?
    Comments:
    403
    Kudos:
    663
    Bookmarks:
    127
    Hits:
    9831
  5. Tags
    Summary

    Blue's been dealing with a lot while training for the royal guard. He was doing well up until an incident with his brother and two best friends...

    Now, he's abused, forced to do things he didn't even fully understand. All he knew was that it hurt. Bad. Sometimes, different monsters would be with his brother. He was too scared to complain or speak, to tell papyrus that it hurt. he just learned to take it.

    Three years without contact from Blue drove the Fell brothers to find out what happened to the precious ball of smiles and energy. But they weren't prepared for what they saw when they did find him.

    Language:
    English
    Words:
    11,716
    Chapters:
    7/?
    Comments:
    1525
    Kudos:
    121
    Bookmarks:
    19
    Hits:
    2196
  6. Tags
    Summary

    Mettaton recognizes an old friend in his audience one evening and seeks to reacquaint himself. Little does he know, perhaps that strange little skeleton he met as a young ghost was truly destined to be the hero he'd been looking out for... but only time, and the events that follow, will tell.

    Language:
    English
    Words:
    12,158
    Chapters:
    7/?
    Comments:
    48
    Kudos:
    37
    Bookmarks:
    10
    Hits:
    413
  7. Tags
    Summary

    A bet is made. The bet goes horribly wrong. Red ends up in lamia!Edge’s territory uninvited. Edge is one big snake. Red’s gonna need a bigger plane…

    Language:
    English
    Words:
    7,708
    Chapters:
    2/3
    Comments:
    24
    Kudos:
    124
    Bookmarks:
    20
    Hits:
    1203
  8. Tags
    Summary

    Things have begun to change in a way that makes pretending futile and uncertainty abundant. Our heroes now have to face each other, as they have been facing themselves. There is no where to hide anymore.

    Series
    Language:
    English
    Words:
    54,487
    Chapters:
    13/19
    Comments:
    28
    Kudos:
    50
    Bookmarks:
    4
    Hits:
    1043
  9. Tags
    Summary

    Heat counts as aphrodisiac, right?

    Red's in a desperate sub heat and triggers Comic's dom heat with is smell. I think we all know where this is headed. To the bedroom.

    Series
    Language:
    English
    Words:
    2,276
    Chapters:
    3/?
    Comments:
    12
    Kudos:
    66
    Bookmarks:
    3
    Hits:
    1448
  10. Tags
    Summary

    Red is forced to take a mission on behalf of the king. However, while he is away Artemis and Nikki decide it is time to tease him

    Language:
    English
    Words:
    1,382
    Chapters:
    1/1
    Kudos:
    2
    Hits:
    44
  11. Tags
    Summary

    Reader x Sans

    You find a bitty Edgy abandoned in the middle of the street during a rain storm and decide to take him in.

    Hilarity and fluff ensues.

     ___

    !!Warning!!

    This story somehow turned incredibly smutty.

    How did we get here?

    Language:
    English
    Words:
    53,894
    Chapters:
    33/?
    Comments:
    815
    Kudos:
    1440
    Bookmarks:
    174
    Hits:
    29097
  12. Tags
    Summary

    Mettaton and Papyrus are new lovers and explore each other's bodies in a bed of flowers. Mettaton finds very quickly that, despite his lack of sexual experience, he is very skilled at learning to adapt. A purely smut piece.

    Language:
    English
    Words:
    1,961
    Chapters:
    1/1
    Comments:
    4
    Kudos:
    17
    Bookmarks:
    3
    Hits:
    142
  13. Tags
    Summary

    The skeleton's find themselves in trouble. Danger threatens the entire world and all the alternate universes, the skeletons realized that they desperately need help as soon as possible. And who better to get than you, the reader?!

    Join the Undertale's skeleton duo and their alternate selves on this journey of saving the world, falling in love and the road to recovery. Every single universe is relying on you... can you handle that extra weight on your shoulders?

    (Reader has a few issues and they go through a lot in this story! If your okay with being dragged through hell and back, then proceed! You shall be rewarded fun times and skeletons lovers for putting up with angst and cliff hangers! Enjoy!)

    Language:
    English
    Words:
    63,973
    Chapters:
    41/?
    Comments:
    1218
    Kudos:
    533
    Bookmarks:
    74
    Hits:
    9039
  14. Tags
    Summary

    Sans know you since forever, but while you are growing up, he starts to see you with different eyes(sockets).

    Language:
    English
    Words:
    6,147
    Chapters:
    4/4
    Comments:
    24
    Kudos:
    153
    Bookmarks:
    18
    Hits:
    2917
  15. Tags
    Summary

    After dozens of resets, Sans finds himself getting so used to the endless cycle that he's become numb to it. He knows his soul is as stale as Papyrus's leftover spaghetti in the fridge, so why does he get this feeling that something new is going to happen?
    Y/N is a girl in her early 20s who wants to take a closer look at the entrance to Mt. Ebott. When she loses her footing at the edge of the entrance to the Underground, she takes a fall and leaves her old life behind forever.
    When Sans comes across Y/N in the forest instead of Frisk, what will he do? Is this the final reset? Will the two be swept together as unlikely friends on their quest to free the Underground, or will they be something more?
    More importantly, when a human with ill-intentions falls in after Y/N, what fate will befall her?

    Language:
    English
    Words:
    40,726
    Chapters:
    33/?
    Comments:
    71
    Kudos:
    390
    Bookmarks:
    51
    Hits:
    6323
  16. Tags
    Summary

    You Fall Down into the Underswap Underground after the Barrier is broken, but why? Who are these strange skeletons, and why is everybody so nice?

    Language:
    English
    Words:
    110,731
    Chapters:
    46/?
    Comments:
    414
    Kudos:
    230
    Bookmarks:
    73
    Hits:
    3645
  17. Tags
    Summary

    Lila takes her bitties to go visit her friend Rachel...will all of this visit be good?

    --DO NOT READ THIS IF YOU DO NOT WANT SPOILERS FOR MY OTHER FANFIC "I Sooo Don't Know The Original Yous..."--

    Series
    Language:
    English
    Words:
    3,455
    Chapters:
    2/?
    Kudos:
    2
    Bookmarks:
    1
    Hits:
    133
  18. Tags
    Summary

    Monsters have been freed from the underground, and honestly, you don't really think they should have. You wouldn't consider yourself 'racist', you just fear for your own safety when murderers wander the streets and move in next door.
    So spilling coffee all over a very large and intimidating skeleton monster was probably not your best move ever. But instead of gutting you, he offers to buy you another coffee. And, despite his... 'crude' language, he seems to be a nice guy. Maybe monsters aren't so bad after all?
    But why do the monsters who used to pay you no mind now cast you pitying looks and avoid you all together?

    Language:
    English
    Words:
    227,940
    Chapters:
    55/?
    Collections:
    1
    Comments:
    1642
    Kudos:
    2091
    Bookmarks:
    277
    Hits:
    32909
  19. Tags
    Summary

    Red Bones (Uf!Sans) won a scholarship in St. Wendell Ebott University, a secluded University in Maine, and goes abroad to study in Tōkyō Rika Daigaku (Tokyo University of Science) to become a Bachelor of Science. With his late father’s last savings he flies to Tokyo and takes residence there.

    Sans Serif (Ut!Sans) is offered a position as a teacher in the prestigious Tokyo University of Science, having won a Nobel Prize in Physics 20XX for his findings in quantum physics and studies of multiple dimensions and The Void. He is ready to impart his wisdom to the masses as a part time professor.

    What happens when these two collide?

    Drama unfolds!

    Language:
    English
    Words:
    11,437
    Chapters:
    7/?
    Comments:
    95
    Kudos:
    102
    Bookmarks:
    9
    Hits:
    1282
  20. Tags
    Summary

    you jumped into the underground, made your way through the ruins, and then you met sans. he likes what he sees and decides he's gonna keep you around for his own amusement. He's a nasty lil skeleton who never fails to remind you that he owns your ass and you kinda like it, but you also really don't. Consent as well as whether you like him or not is kinda a blurred, greyish area. Nevertheless, shenanigans and angsty love feels ensue

     

    this will be shamelessly smutty and kinda twisted with nihilistic ideologies, dark humor and a fucked up lack of morals because I like that shit.

    Language:
    English
    Words:
    82,789
    Chapters:
    32/?
    Comments:
    225
    Kudos:
    381
    Bookmarks:
    52
    Hits:
    8309

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