61 - 80 of 282 Bookmarked Items in Alternate Universe - Undertail (Undertale)

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  1. 18

    My Star by

    Fandoms: Undertale (Video Game)  

    12 Oct 2015

    Tags
    Summary

    having fun backstage~

    Language:
    English
    Words:
    855
    Chapters:
    1/1
    Comments:
    14
    Kudos:
    473
    Bookmarks:
    18
    Hits:
    11,944

  2. 12

    Not a Trace by

    Fandoms: Undertale (Video Game)  

    20 Nov 2021

    Tags
    Summary

    Sans is just trying to make an honest living by extracting scrap from the junkyard and selling it to the Royal Labs from a shady cavern in Waterfall. Now if he could just figure out why he constantly feels like he's being watched...

    Mind the tags, particularly noncon/rape and torture! This one gets pretty dark.

    Language:
    English
    Words:
    5,030
    Chapters:
    1/1
    Comments:
    16
    Kudos:
    105
    Bookmarks:
    12
    Hits:
    2,722

  3. 17

    Let the Rain Fall by

    Fandoms: Undertale (Video Game)  

    04 Aug 2016

    Tags
    Summary

    They both knew it would come to this. The lives they lived meant that one of them would live and the other would die. But how can not only you kill the one you love?

    Language:
    English
    Words:
    2,877
    Chapters:
    1/1
    Comments:
    12
    Kudos:
    162
    Bookmarks:
    17
    Hits:
    2,930

  4. 40

    Little One. by

    Fandoms: Undertale (Video Game)  

    18 Dec 2020

    Tags
    Summary

    He loved you.

    He was obsessed.

    He wanted you.

     

    What was keeping him from you?

    Language:
    English
    Words:
    6,320
    Chapters:
    4/4
    Comments:
    17
    Kudos:
    351
    Bookmarks:
    40
    Hits:
    11,258

  5. 7

    Forbidden by

    Fandom: Undertale (Video Game)

    17 Mar 2017

    Words:
    15,396
    Works:
    2
    Bookmarks:
    7

  6. *

    "I've found something in your pocket" by for NotYourMemily

    Fandoms: Undertale (Video Game)  

    07 Dec 2016

    Tags
    Summary

    Sans was out at Grillbys, and you found something in his jacket...

    In which Sans and Reader experience long-distance boning.

    Language:
    English
    Words:
    5,503
    Chapters:
    2/2
    Comments:
    88
    Kudos:
    1,336
    Bookmarks:
    181
    Hits:
    17,756

  7. 23

    Mirrors by

    Fandoms: Undertale (Video Game)  

    20 Aug 2016

    Tags
    Summary

    It was somewhat narcissistic, no? Falling in love with ‘yourself’? Silly. Of course you knew he was a different person, and that your attraction had nothing to do with appearances. It was about caring and protecting – your fucking old and annoying brother complex hitting again, throwing on your face how fucked up you were, but now with a different subject. You were able to keep your hands off Papyrus because you would never be able to touch something as pure with your dirty hands. But Red was diferent. He was already tainted, broken – more than yourself, no less. You’d take him to your lap every time he had a nightmare, just like you did to Papyrus when he was a small skeleton, but you knew that if you did this to Red, consequences would be different.
    And you knew he thought the same.

    UT! Sans x UF! Sans

    Series
    Language:
    English
    Words:
    6,485
    Chapters:
    2/2
    Comments:
    41
    Kudos:
    325
    Bookmarks:
    23
    Hits:
    6,419

  8. 10

    Killer's mouth being put to good use...for once. by

    Fandoms: Undertale (Video Game)  

    10 Mar 2025

    Tags
    Summary

    Dust never thought he'd say this, but Killer is REALLY fucking good with his mouth....when he's not running it and annoying the shit out of him, that is.

    Language:
    English
    Words:
    1,065
    Chapters:
    1/1
    Comments:
    6
    Kudos:
    108
    Bookmarks:
    10
    Hits:
    1,221

  9. 7

    Alphys VS Undyne by

    Fandoms: Undertale (Video Game)  

    08 Aug 2016

    Tags
    Summary

    In what is undoubtedly one of the funniest Undertale fanfics of all time, Alphys and Undyne settle their ever-growing romantic rivalry in a hilariously wacky series of contests ranging from crack-shipping playdates, tickle torture and singing to verbal wrestling, one-on-one multiplayer ownage, Mario Kart copyright infringement, cartoon intro parodies and even some hot Undyne-on-Alphys giantess action!

    For Alphyne fans looking for some funny, sexy and satirical romantic-comedy stuff to both laugh and occasionally jerk it to, you've officially reached heaven! Enjoy your stay here, pals!

    Language:
    English
    Words:
    11,239
    Chapters:
    7/7
    Collections:
    3
    Comments:
    19
    Kudos:
    37
    Bookmarks:
    7
    Hits:
    5,685

  10. 10

    Managing a Whore... by

    Fandoms: Undertale, Undertale (Video Game)  

    18 Nov 2015

    Tags
    Summary

    You are the manager, producer, and babysitter of Mettaton... He has tried all the tricks on you, and granted you haven't quiet shown it. But you have fallen for him. This has a genderless reader and has a good bit of oral sex and masturbation. Have fun darlings~ <3

    Language:
    English
    Words:
    1,772
    Chapters:
    1/1
    Comments:
    4
    Kudos:
    171
    Bookmarks:
    10
    Hits:
    7,977

  11. *

    Double-D's Get Degrees by

    Fandoms: Undertale (Video Game)  

    02 Dec 2018

    Tags
    Summary

    Sex.
    In human culture, it is both vilified as well as romanticized. Young people are both discouraged and encouraged to have it, and especially in a college party atmosphere, the mixed signals can be stressful.
    Then the monsters came to the surface, and from the other universes. It was never fully explained why or how, but it happened, and they were quick to stick together. Within months, Undertail University was founded by Dr. W. D. Gaster, and it gained a reputation as a thriving college atmosphere that boasted high graduation and success rates. It also boasted a very different view of sex, one that monsters had been entertaining for centuries.
    Somehow, against all odds and despite what people said, you’d applied.
    Somehow, you’d been accepted.
    And somehow, for some unknown reason...you’d enrolled.
    (Based on the headcanons of Skelltales and the #discordcrew on Tumblr, as well as some of my own. Written with permission.)

    Language:
    English
    Words:
    20,022
    Chapters:
    8/?
    Comments:
    334
    Kudos:
    959
    Bookmarks:
    205
    Hits:
    16,854

  12. 7

    Ohh Yes! by

    Fandoms: Undertale (Video Game)  

    15 Nov 2015

    Tags
    Summary

    A monster's life is short, why not put on a show?
    Heavy nsfw, male reader x mettaton smut,
    Chapters 2/?

    Language:
    English
    Words:
    2,181
    Chapters:
    4/?
    Comments:
    13
    Kudos:
    369
    Bookmarks:
    7
    Hits:
    13,111

  13. 18

    Chili Fries Go Straight To Your Thighs by

    Fandoms: Undertale (Video Game)  

    22 Mar 2017

    Tags
    Summary

    WARNING: 18+, Contains Undertale feederistic content (I.e- getting fat. I.e- liking it), also called ‘Undertum’. If this is not your thing, please keep scrolling. Thank you.

    Summary: When a food challenge goes awry, it's up to Grillby to salvage things especially when his questionable heroic behavior baffles even himself.

    LAST WARNING (this one is a bit out there so if you'd please), THIS IS SUPER BELLY FETISH TERRITORY!!! IF YOU REALLY DISLIKE, ESCAPE NOW!! Thank you again.

    Language:
    English
    Words:
    10,108
    Chapters:
    1/1
    Comments:
    8
    Kudos:
    160
    Bookmarks:
    18
    Hits:
    6,311

  14. 29

    Perks of Getting Caught by

    Fandoms: Undertale (Video Game)  

    03 May 2017

    Tags
    Summary

    Sans catches Papyrus watching porn. What does this mean in consideration of their supposedly light hearted dating training?

    Language:
    English
    Words:
    5,324
    Chapters:
    1/1
    Comments:
    21
    Kudos:
    220
    Bookmarks:
    29
    Hits:
    3,976

  15. 52

    Three of a kind by

    Fandoms: Undertale (Video Game)  

    17 Jul 2016

    Tags
    Summary

    UT Sans, UF Sans and US Papyrus have the house to them selves and decide to have a Poker night, and well that's fun and all, Stretch(US Papyrus) thinks he has a way to make this night even more enjoyable.

    Language:
    English
    Words:
    6,304
    Chapters:
    4/4
    Comments:
    49
    Kudos:
    615
    Bookmarks:
    52
    Hits:
    9,724

  16. *

    Fontcest Kinktober 2016 Challenge by

    Fandoms: Undertale (Video Game)  

    31 Oct 2016

    Tags
    Summary

    This was the Kinktober Challenge for 2016! All of the pairings here are variations of Fontcest. Kinks include Spanking, Dirty Talk, Bukkake, Humiliation, Size Difference, Creampie, Edgeplay, Master/Slave, Sadism/Masochism, Medical Play, Sensory Deprivation, Sounding, Wax Play, Daddy Kink, Gore/Blood, Prostitution, Pet Play, Double Penetration, Public Sex, Asphyxiation, Shibari, Exhibitionism/Voyeurism, Boot Worship, Shotgunning, Branding, Xenophilia, Watersports, Toys and more to celebrate Halloween in a kinky way!

    Please enjoy!

    Language:
    English
    Words:
    34,878
    Chapters:
    31/31
    Comments:
    589
    Kudos:
    1,244
    Bookmarks:
    118
    Hits:
    45,807

  17. 42

    A Comic's Christmas by for Tereox_X

    Fandoms: Undertale (Video Game), Undertail - Fandom, Underfell - Fandom  

    29 Jan 2018

    Tags
    Summary

    Tale Sans is on the Surface, one of the few survivors of a genocide route. He attempted to use the child's Determination against them, forever costing him his brother. However, sometimes all it takes is a gentle hand in the right direction to have someone believe in the power of love, life and joy.

    Language:
    English
    Words:
    5,237
    Chapters:
    1/1
    Comments:
    6
    Kudos:
    256
    Bookmarks:
    42
    Hits:
    2,003

  18. 13

    Sleepy Brother by

    Fandoms: Undertale  

    11 Nov 2016

    Tags
    Summary

    Sans falls asleep sometimes during certain moments but Papyrus is going to keep playing with him

    Language:
    English
    Words:
    664
    Chapters:
    1/1
    Comments:
    3
    Kudos:
    214
    Bookmarks:
    13
    Hits:
    4,600

  19. 18

    Chasing Away Shadows by for Pantherra

    Fandoms: Undertale (Video Game)  

    17 Dec 2015

    Tags
    Summary

    Papyrus has a nightmare and needs to know everything's OK.

    Language:
    English
    Words:
    919
    Chapters:
    1/1
    Comments:
    11
    Kudos:
    499
    Bookmarks:
    18
    Hits:
    9,861

  20. 3

    “Good Time” by for fudgelling_away

    Fandoms: Undertale (Video Game)  

    25 Jul 2024

    Tags
    Summary

    Sans and reader are having gooooddddd tiiimmeee!

    Language:
    English
    Words:
    1,737
    Chapters:
    2/2
    Kudos:
    19
    Bookmarks:
    3
    Hits:
    1,527

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