1 - 20 of 222 Works in Undertale Monsters in Heat

Pages Navigation

Listing Works

  1. Tags
    Summary

    Gaster did say he wanted Sans to be mean to him, just a little bit.

    Series
    Language:
    English
    Words:
    13,214
    Chapters:
    1/1
    Comments:
    9
    Kudos:
    15
    Bookmarks:
    2
    Hits:
    201
  2. Tags
    Summary

    Swap Alphys has only ever been in love with two people, her Undyne and her Blue. When Undyne dies after Alphys takes the throne, Alphys seeks out Blue. Eventual Swap Salphyne.

    Series
    Language:
    English
    Words:
    21,153
    Chapters:
    14/?
    Comments:
    24
    Kudos:
    94
    Bookmarks:
    17
    Hits:
    2317
  3. Tags
    Summary

    Finally getting his lover and his brother back to the surface, Edge begins the healing process. The hallmarks of progress are different for everyone when coming back from the brink of starvation, but for Edge, it looks like he's finally reached that moment where he feels like he's safe.

    Because he's in heat, and it's Papyrus who will have to care for him through it.

    Series
    Language:
    English
    Words:
    5,543
    Chapters:
    3/?
    Comments:
    37
    Kudos:
    76
    Bookmarks:
    4
    Hits:
    693
  4. Tags
    Summary

    Error gotta do the fuck fuck cuz stupid skeleton head canon! And ink is just wrong place wrong time

    Language:
    English
    Words:
    1,724
    Chapters:
    1/1
    Comments:
    18
    Kudos:
    39
    Bookmarks:
    6
    Hits:
    416
  5. Tags
    Summary

    Sans dedicates every waking moment of his life to keep his little brother safe, happy, and blissfully ignorant of their father's depravity. He lives for the moments he can steal away with Papyrus and pretend their life is normal, happy. But as Gaster's stranglehold on Sans' life begins to loosen, he finds more to live for. He finds himself fighting back with disastrous consequences. And for the first time he's willing to risk everything for a chance at not just surviving, but actually living.

    Grillby has loved Sans from a distance, not wanting to complicate the young mans' life further. While he doesn't know the depth of Gaster's hold on Sans' psyche, he knows Sans doesn't feel safe at home and he knows the bruises he carries are deliberate. When Sans starts to butt heads with his father over the budding relationship with the gentle barkeeper, Grillby does his best to comfort and care for him; supporting him through the trials of recovery as their lives become inextricably bound together.

     

    *A prequel to the events in Lucky Strike and Us In Motion which are set in the Underfell AU.

    *This is a stand-alone plot.

    Series
    Language:
    English
    Words:
    351,415
    Chapters:
    25/?
    Comments:
    99
    Kudos:
    72
    Bookmarks:
    7
    Hits:
    1612
  6. Tags
    Summary

    Unlike many other stories loosely inspired by the likes of Skeleton Squatters and the Landlady by Tyrant_Tortoise, the female-presenting reader, which uses second-person perspective, are not from 'this' modern universe at all - not even a variant. To clarify, your home is a sort of mix between conventional fantasy and modern city life, or otherwise considered modern fantasy.

    You aren't going to have a good time.

    erratic updates, since i don't have much actually written down.

    Language:
    English
    Words:
    5,131
    Chapters:
    7/?
    Comments:
    10
    Kudos:
    42
    Bookmarks:
    9
    Hits:
    880
  7. 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:
    140,247
    Chapters:
    50/?
    Comments:
    2139
    Kudos:
    2322
    Bookmarks:
    472
    Hits:
    86923
  8. Tags
    Summary

    Papyrus is injured while performing his duties as an unofficial royal guard. Ambassador Frisk volunteers to help him apply a healing oil to his damaged bones, but it seems the oil has some unexpected side effects. Will Papyrus be able to resist the ambassador while under the influence of his heat? ..... well, not for very long.

    However, as the two grow closer it becomes apparent that the life of this polyamorous ambassador is very complicated and though she bends over backwards (not always in the fun way) to protect the monsters she has come to care for, secrets from her past have come back to haunt her and threaten to undo all the good she has tried to create. It is good then, that she has the help of such a cool guy on her side... a few cool guys actually.

    Language:
    English
    Words:
    108,411
    Chapters:
    43/?
    Comments:
    391
    Kudos:
    575
    Bookmarks:
    71
    Hits:
    15296
  9. Tags
    Summary

    Red goes into his first ever heat and is thrust into a horrible situation. Dogamy and Dogaressa are there to help.

    Kinktober 2021 Day 31

    Series
    Language:
    English
    Words:
    1,233
    Chapters:
    1/1
    Kudos:
    27
    Bookmarks:
    2
    Hits:
    249
  10. Tags
    Summary

    A collection of works spreading all across the many AUs, including many of my own invention, Frans centric~

    Language:
    English
    Words:
    80,423
    Chapters:
    31/31
    Comments:
    187
    Kudos:
    226
    Bookmarks:
    26
    Hits:
    6869
  11. Tags
    Summary

    Monsters from the multiverse have finally been freed from their respective undergrounds and are attempting to survive among human society and culture,clashed together in political turmoil and social uneasiness. The release of the monsters from the underground has instilled magical properties into the genetic coding of particularly capable humans, making the population of the world clamor to understand magic, monsters, and how they will all coexist peacefully. After being kicked out of your apartment complex from a bigoted monster racist landlord, you find help and solace with your new friend Undyne, who presses into an old friend of hers to find a way to help you out. A particular skeleton who has already become well off in the surface world offers you a place to stay, not realizing that you come with a twist of magic all your own. Although you have found the new world you have been thrust into exciting, not all is well, and you soon discover that monsters and humans alike have their own ideas about how the world should be run... making you both an ally and target.

    Language:
    English
    Words:
    134,136
    Chapters:
    30/?
    Comments:
    71
    Kudos:
    423
    Bookmarks:
    95
    Hits:
    10939
  12. Tags
    Summary

    It’s been 10 years since the monsters were free, but the day of their freedom the one who set them free disappeared.... On the day of the tenth anniversary Sans finally is successful in finding their savior.... But things aren’t what he thought. Frisk doesn’t seem to want anything to do with any of them and Sans’ own words come back to haunt him as the human they had all thought was their best friend is terrified of them.... Can Sans and the others repair the damage they have unknowingly done to a soul who not only showed them compassion, but did so at the cost of herself along with having the inability to even properly see them... Will things ever be the same or will the rift between the monsters and their Angel be broken forever?

    Series
    Language:
    English
    Words:
    46,812
    Chapters:
    20/?
    Comments:
    22
    Kudos:
    28
    Bookmarks:
    3
    Hits:
    755
  13. Tags
    Summary

    Kinktober 2021 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.

    Language:
    English
    Words:
    5,653
    Chapters:
    4/32
    Comments:
    5
    Kudos:
    69
    Bookmarks:
    12
    Hits:
    2013
  14. Tags
    Summary

    The aftermath of Queen Alphys' decision continue to hurt Sans more and more.

    Series
    Language:
    English
    Words:
    639
    Chapters:
    1/1
    Comments:
    1
    Kudos:
    16
    Hits:
    378
  15. Tags
    Summary

    Everything is so hot. Why is everything so hot?

    Language:
    English
    Words:
    1,546
    Chapters:
    1/1
    Comments:
    8
    Kudos:
    103
    Bookmarks:
    11
    Hits:
    1159
  16. Tags
    Summary

    Frans drabbles, from comments here and on Tumblr. NSFW edition!

    Language:
    English
    Words:
    57,713
    Chapters:
    37/?
    Comments:
    305
    Kudos:
    820
    Bookmarks:
    90
    Hits:
    33760
  17. Tags
    Summary

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

    Language:
    English
    Words:
    11,539
    Chapters:
    8/?
    Comments:
    2
    Kudos:
    48
    Bookmarks:
    11
    Hits:
    1130
  18. Tags
    Summary

    A science experiment created by humans (Y/n) Knows little of her own kind, and little of the world from hiding with her human family. When the barrier breaks and monsters integrate with society (Y/n) sees this as her chance to have a normal life. When she finally sees another skeleton who's to say what may happen?

    Language:
    English
    Words:
    53,140
    Chapters:
    25/?
    Comments:
    192
    Kudos:
    661
    Bookmarks:
    134
    Hits:
    17928
  19. Tags
    Summary

    A continuation of ~In Underland~
    The Sans Route

    You're trying your best to focus on your tasks at hand but a certain skeleton keeps distracting you.
    He totally isn't trying to bone you, he just want to be friends... even if he has made multiple jokes about it. It's all just harmless jokes right?
    Right?
    Sans is the puns guy, the comic relief. A funny friend.....
    Just a funny fuckable friend.

    Series
    Language:
    English
    Words:
    2,280
    Chapters:
    1/13
    Comments:
    11
    Kudos:
    38
    Bookmarks:
    11
    Hits:
    700
  20. Tags
    Summary

    Some one-shots from the "Don't You Remember?" series. Honestly just done for smutty and fluffy fun ;)

     

    If you wanna jump in here, be my guest. :D It's going to be much less dark than the rest of the series. This will mostly be scenes with an established threesome of female reader, UF!Grillby and UF!Sans. But there might be some random encounters later, I dunno. Just updating this whenever I get a new idea. Kind of like an OVA?

    *This WILL have BDSM! And probably past-traumas mentioned but not explicitly described. There'll be warnings in the chapter headings if they are.

    *FIC title name from "After Dark" by Mr. Kitty, because i'm terrible at titles.

    Series
    Language:
    English
    Words:
    14,160
    Chapters:
    2/?
    Comments:
    4
    Kudos:
    15
    Bookmarks:
    2
    Hits:
    731

Filters

Filter results:
Submit

Include

?
Include Ratings
Include Warnings
Include Categories
Include Fandoms
Include Characters
Include Relationships
Include Additional Tags

Exclude

?
Exclude Ratings
Exclude Warnings
Exclude Categories
Exclude Fandoms
Exclude Characters
Exclude Relationships
Exclude Additional Tags

More Options

Crossovers
Completion Status
Word Count
Date Updated
Submit

Pages Navigation