1 - 20 of 255 Works in Undertale Monsters in Heat

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  1. Tags
    Summary

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

    Language:
    English
    Words:
    47,668
    Chapters:
    21/?
    Comments:
    160
    Kudos:
    337
    Bookmarks:
    92
    Hits:
    6,623
  2. Tags
    Summary

    Phoenix was loving, caring, trusting and kind...until the world destroyed her inside and out. Now, she just wants the pain and suffering to end. she wants to be at peace. suddenly, Phoenix and her two cousins were thrown out of their reality and given another chance.

    Sans and the other's knew they fucked up when two human woman were on the ground unconscious and the other woman, as scarred up as she was, stood on shaky legs between them with a nasty dead glare.

    "What the fuck.."

    ---

    Will Phoenix finally be safe?
    Will these skeletons earn her trust?
    Or will they Judge her like all the other humans?

    Language:
    English
    Words:
    13,147
    Chapters:
    5/90
    Comments:
    16
    Kudos:
    28
    Bookmarks:
    19
    Hits:
    727
  3. Tags
    Summary

    Tasked by an LV-addled Asgore to create something that could protect monsterkind from the humans after their return to the surface, Dr. Gaster made over a dozen young skeletons in a lab and taught them to keep watch over the base of Mt. Ebott. That was over 30 years ago, however, and things haven’t exactly gone as planned.

    Series
    Language:
    English
    Words:
    15,661
    Chapters:
    7/?
    Comments:
    12
    Kudos:
    25
    Bookmarks:
    12
    Hits:
    431
  4. Tags
    Summary

    Killer is lost to The Void, presumed dead. Seven years later he returns, not as himself, but rather as Eclipse. Can his partners still love him when he's become someone new?

    Language:
    English
    Words:
    131,009
    Chapters:
    16/?
    Comments:
    256
    Kudos:
    628
    Bookmarks:
    119
    Hits:
    19,352
  5. Tags
    Summary

    ''You didn't realise that skeleton monsters had the most beautiful eyes..''

    As it turns out, a chance meeting in a bar could lead you the most unexpected, happy, desperate times of your life.
    You had decided to move back home to Ebott City after finally breaking up with your asshole ex boyfriend, playing in bars and at parties was a good source of income but while your grandparents old home is being renovated you have nowhere to go.. until you’re pulled into a family of skeletons and their girlfriend. How unexpected..
    ...
    Oh.. You're pretty sure you've fucked one of her housemates.

    ''..If only they stopped glaring at you.''

    Language:
    English
    Words:
    78,933
    Chapters:
    54/?
    Comments:
    679
    Kudos:
    1,457
    Bookmarks:
    254
    Hits:
    37,378
  6. Tags
    Summary

    Red confronts Lust -- or gets confronted by him. It's hard to tell who's got whom at this point, not that Red minds.

    Red has a lot of thoughts about things that fit old familiar patterns (like smiles) and things that don't (like fangs).

    Lust is at the end of his tolerance and he makes what he thinks is another in a long string of bad decisions.

    Series
    Language:
    English
    Words:
    5,072
    Chapters:
    2/2
    Comments:
    28
    Kudos:
    29
    Bookmarks:
    1
    Hits:
    336
  7. 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:
    9,907
    Chapters:
    7/7
    Comments:
    20
    Kudos:
    45
    Bookmarks:
    6
    Hits:
    1,086
  8. Tags
    Summary

    Ever since the karaoke bar he and (y/n) have been inseparable, eventually moving in with each other

    She left to go fix the espresso machine, left sans a note saying she’d be back.
    And sans remembered what happens when monsters find their mates.

    Series
    Language:
    English
    Words:
    4,622
    Chapters:
    1/1
    Comments:
    3
    Kudos:
    62
    Bookmarks:
    8
    Hits:
    1,556
  9. Tags
    Summary

    All you desired was a normal life, though it was hard having that when monsters came to the surface years ago- not like you had a problem with it.

    It all began with a huge favor.

    Damn you for being too nice.

    Language:
    English
    Words:
    2,940
    Chapters:
    3/?
    Comments:
    3
    Kudos:
    77
    Bookmarks:
    21
    Hits:
    1,042
  10. Tags
    Summary

    Posted for Rarepair New Year 2024

    Error finds himself a bit heated after a fight with the Stars and unable to return to his Anti-Void. Luckily for him the Stars are more than willing to lend some help.

    Language:
    English
    Words:
    4,428
    Chapters:
    1/1
    Collections:
    1
    Comments:
    10
    Kudos:
    89
    Bookmarks:
    15
    Hits:
    1,155
  11. Tags
    Summary

    You're a lawyer and a hustler.

    He's a gambler and a comedian.

    The more time you spend solving a case together, the more obvious the joke gets.

    Language:
    English
    Words:
    3,808
    Chapters:
    3/3
    Comments:
    8
    Kudos:
    55
    Bookmarks:
    12
    Hits:
    1,401
  12. Tags
    Summary

    This is a shorts series I started writing for one of my AUs, Skyfall(SKF!AU).

    Havoc(Error) and Savith(Ink) are survivors of the tyranny sweeping across galaxies, a powerful warlord imprisoning people in what was supposedly a perfect reality, some kind of mental prison. Their planet was decimated and all of their kind taken prisoner or killed. They barely made it off their planet alive after the initial attack. After all that, they now have to face the challenge of being alone together, with all the history they have together. On top of that, having entirely new trauma stemming from the destruction of their home. What are the odds that out of everyone on the planet, you find yourself stuck with someone you share so much beautiful, and painful history with? Low.

    Odds don't really matter when the universe is infinite, though.

    Series
    Language:
    English
    Words:
    4,248
    Chapters:
    9/?
    Comments:
    20
    Kudos:
    7
    Bookmarks:
    2
    Hits:
    141
  13. Tags
    Summary

    (A self-insert fic of me ((as a mage)) x the nightmare gang. Can be an x reader if you're good at mental editing. But this mainly for me hehe)

    A strange human woman appears at the doorstep of Nightmare's castle, wanting to pledge her life to him.

    Language:
    English
    Words:
    2,719
    Chapters:
    4/?
    Comments:
    3
    Kudos:
    12
    Bookmarks:
    4
    Hits:
    213
  14. 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:
    31,016
    Chapters:
    8/?
    Comments:
    28
    Kudos:
    111
    Bookmarks:
    27
    Hits:
    3,167
  15. Tags
    Summary

    Nightmare found 2 new skeletons to add to his *cough* Harem *Cough* and what a surprise, they’re girls! The bad Sanses quickly learn to accept these two into their crew and after awhile courtship starts.

     

    This Is My First Work On AO3 And I Might Not Finish This But Oh Well. Have Fun Guys!

    Language:
    English
    Words:
    5,902
    Chapters:
    3/?
    Comments:
    5
    Kudos:
    11
    Bookmarks:
    3
    Hits:
    282
  16. Tags
    Summary

    (Y/n) lost her job, which sucks. If only she hadn't lost her second job, and apartment, as well! Now all she's got is a camper full of her crap on the back of her truck, and nowhere to go. At least she found this campground, even if it is in the middle of nowhere, and looks like no one has been around it for a while, and a skeleton with a head wound tries to make her into a meal... Rough start to making new friends, but his brother is sweet enough!
    And then there's the other skeletons who inhabit the other cabins, who all look vaguely similar... Their explanation of "cousins" only goes so far, but there are more concerning things to worry about, like how almost every skeleton is trying to get into her pants, their heats, and where her clothes, particularly her socks, keep disappearing to?!

    Language:
    English
    Words:
    185,798
    Chapters:
    65/?
    Comments:
    2,597
    Kudos:
    3,723
    Bookmarks:
    704
    Hits:
    173,301
  17. Tags
    Summary

    You're no one special. Just another human living with a single parent. Your life is pretty boring, or so you think, but then one day you wake up and it's not in your bed...

    Series
    Language:
    English
    Words:
    43,339
    Chapters:
    41/?
    Comments:
    16
    Kudos:
    79
    Bookmarks:
    18
    Hits:
    2,048
  18. 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:
    36,347
    Chapters:
    26/?
    Comments:
    75
    Kudos:
    586
    Bookmarks:
    58
    Hits:
    29,274
  19. 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:
    108,386
    Chapters:
    74/74
    Comments:
    612
    Kudos:
    479
    Bookmarks:
    80
    Hits:
    17,288
  20. Tags
    Summary

    After a failed suicide attempt you found yourself in the Underground. Your thoughts are still dark and the wish of sweet death embrace is still within your heart. But maybe a new life here in The Underground is what you really need, maybe the affections of the Skeleton Brothers are what you need to heal your dying soul. But what's this you find yourself falling for them; BOTH!

    Language:
    English
    Words:
    117,378
    Chapters:
    47/?
    Comments:
    659
    Kudos:
    2,025
    Bookmarks:
    284
    Hits:
    60,941

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