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Summary
Sans knew in his soul that there was only one way he was now in another universe. Erasure was one thing a reset would fix, but corrupting and breaking it would be the only reason he was here now.
He had expected to overwhelmed in this world of 'kill or be killed' but it was this timeline's version of his brother and himself that had him stepping up. He was a 1 HP monster, physically weak but he did have one thing on his side in a world so filled with LOVE.
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Adaptation: Chapters 1 - 30
Harmonize: Chapters 31 - 42
Supremacy: Chapters 43 - 80
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Part One of the KR Trilogy.
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*This is my personal take on the Underfell AU. I hope you enjoy it as much as I am enjoying writing it! Please feel free to write or draw for this story, you don't need my permission for that.
Series
- Part 1 of KR Trilogy
- Language:
- English
- Words:
- 127,905
- Chapters:
- 81/81
- Comments:
- 4,110
- Kudos:
- 4,537
- Bookmarks:
- 544
- Hits:
- 117,281
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Summary
Sans surprises his girlfriend by, amazingly enough, not being a jerk.
Series
- Part 2 of Requests from Tumblr
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Oneshots and Cumshots by Minagi_Writes_Shit for Sylaiise
Fandoms: Undertale (Video Game)
23 Jun 2019
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Summary
This was meant to be a short oneshot because biscy told me to try my hand at smut. It wasn't supposed to be this long, but whatever. Turned out stupidly self indulgent. Leaving this open in case I end up doing any other oneshots, since I don't want a clusterfuck of tiny works. May take requests if something strikes my fancy.
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You and your family are just enjoying a nice day at the park, when a life changing event happens that ruins everything.
You get taken away to a facility to be tested on...
Life doesn't feel as peaceful as it once did, you hated your new life.
"I wish I could just go into those story books I used to read..."
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Here Comes the Bride by FandomWorld9728
Fandoms: Undertale (Video Game), Underfell - Fandom, Underswap - Fandom, Swapfell red - Fandom, Fellswap Gold - Fandom, Horrortale - Fandom, Underlust - Fandom
24 Oct 2025
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Summary
You were so excited to finally get married to your long time fiancé, only for him to leave you for another girl with nothing but a note. Lucky for you, your two best friends were there to help you through this rough patch of your life.
Series
- Part 12 of Undertales Across the Multiverse
- Part 8 of Papyrus/Reader Fics
- Part 8 of Sans/Reader Fics
- Part 1 of Here Comes the Bride
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Summary
A rewrite of a previous fic, changed structure and story and more Sans' to have sex with.
Years have passed since the barrier had fallen and freed the monsters. You had your found family with them, Sans in particular being your best friend and support. You heard of SOULmates and how monsters have them, you wondered yourself if humans also had SOULmates, and you find out as you begin to travel through different Undertale AU's just how SOULmates and SOULs work through the multiverse.
*I DON'T USE Y/N*
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Summary
The thing about soulmates is, no matter what pries them apart, they always...always find a way back together
Chapters 1-3: Prologue
Chapters 4+: Main Story
*This is a rewrite of I Have The Power of Gaster AND Anime On My Side. Same concept, with a bit of a serious feel.*
**Please be aware that this is not like my usual reader-inserts!! This story is in 3rd person pov, very vague description of a female reader. Unnamed (Pet names only). No use of y/n, y/e/c etc.**
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Bookmark Notes:
16
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Summary
You've lost focus. Ink wants to know why, and he's determined to get it out of you.
Edit: This started as just me wanting to write smut with Ink, and it turned into a damn love triangle between Reader, Ink and Error, complete with (maybe platonic) cameos from other Sansi.
Anyways, here's a whole porno with plot, if that's your thing XD
Series
- Part 2 of The Out-Code Files
- Language:
- English
- Words:
- 103,195
- Chapters:
- 23/?
- Comments:
- 667
- Kudos:
- 1,302
- Bookmarks:
- 230
- Hits:
- 47,032
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- Words:
- 77,064
- Works:
- 7
- Bookmarks:
- 106
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- Words:
- 12,404
- Works:
- 2
- Bookmarks:
- 2
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Summary
You and Sans have spent the last five years toiling in the lab on your magnum opus: a looking glass into alternate timelines. But when you test it one late night in the lab, the impossible happens and you are taken into a world much more violent and crueler than your own. Needing to survive until you're rescued, you will have to use all your wits, charm, and determination to convince three paranoid skeletons you aren't insane or a spy. Good luck, doll.
- Language:
- English
- Words:
- 105,124
- Chapters:
- 20/?
- Comments:
- 363
- Kudos:
- 782
- Bookmarks:
- 192
- Hits:
- 20,765
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Bookmark Notes:
Despite the spelling errors, it's a really brilliant fic. I really like everyone's characterizations and how real everyone feels.
It's good to see that thing's have cleared up in chapter 20- and that the house arrest is finally over... Really wondering what would happen next- especially now that Sans knows it wasn't all a lie.
Hoping for updates. Ch. 20
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Summary
Sans tries to go back in time to before his brother is killed. He ends up in the Underfell universe and bites off a lot more than he can chew. Can Underfell Papyrus help him back home or will he be stuck in this awful world forever?
Notes:
Noncon/dubcon warnings do not apply to any fontcest relationship.
If you wish to skip the rape scene in this fic, you can skip chapter 3. However, the rest of the fic heavily references this chapter as this is a rape recovery longfic.
Please read the warnings in the notes section of each chapter.- Language:
- English
- Words:
- 196,175
- Chapters:
- 36/?
- Collections:
- 2
- Comments:
- 929
- Kudos:
- 1,217
- Bookmarks:
- 178
- Hits:
- 33,884
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Summary
Dust sees Underswap#832 Sans, Blue, and immediately wants him. Kidnapping and fucking ensue.
Bad Brother AU prompt from Sans-gust Event!
Series
- Part 1 of Sansgust-22
- Language:
- English
- Words:
- 1,150
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 8
- Kudos:
- 141
- Bookmarks:
- 15
- Hits:
- 2,963
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The Sacrificial Skeleton and the Labyrinth of Gods by this_is_my_alt
Fandoms: Undertale (Video Game)
28 Sep 2025
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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:
- 239,418
- Chapters:
- 50/60
- Collections:
- 1
- Comments:
- 1,181
- Kudos:
- 2,426
- Bookmarks:
- 491
- Hits:
- 84,774
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Bookmark Notes:
1
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Strangers on the Train{Hiatus} by RazialNightfire, RoseDarkfire
Fandoms: Undertale (Video Game)
06 Jun 2021
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Summary
Sans is stuck taking the train late at night. His heat decides to start and he meets a stranger willing to help him...
Series
- Part 1 of Undertale Dimensions
- Language:
- English
- Words:
- 394,668
- Chapters:
- 63/63
- Collections:
- 1
- Comments:
- 618
- Kudos:
- 456
- Bookmarks:
- 119
- Hits:
- 17,806
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Dance Magick Dance by Diyami for HailSam
Fandoms: Undertale (Video Game), Multi-verse - Fandom
28 Jan 2022
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Summary
Set in an Arabian night's world.
Edge (a.k.a Death) is the head of a nomad group and always kept his baby brother, Cherry very sheltered because of his HP.
Cherry will come of age tomorrow and Edge has prepared a feast so his brother can pick a mate, but things don’t go as planned.
Because of some bad choices, Cherry finds himself kidnapped and sold to a harem in the Sheikh’s palace.Series
- Part 3 of Dance of Ice and Fire
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Bookmark Notes:
Honey cherry harem
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Bookmark Notes:
32 ❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️
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The Soldier and the Carnal Skeletons by Writers_War_Z0ne
Fandoms: Undertale (Video Game)
08 Sep 2021
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Summary
**DISCONTINUED**
(Y/n), a high ranking Platoon Commander in the Military, was on a mission with her squad when her plane was shot down by an enemy ship, leaving her stranded on an unknown island, with none of her comrades in sight.
It would have been all fine an' dandy... if she wasn't surrounded by three Alpha Skeletons and one Omega Skeleton. All of which want to fuck or be fucked by her.
So now here she is, having to assess her dominance as an “Alpha” to get by with her limbs still attached and her clothes still in one piece. Even if one of them looks like he came straight from Satan's asshole.
- Language:
- English
- Words:
- 113,924
- Chapters:
- 40/40
- Collections:
- 1
- Comments:
- 1,758
- Kudos:
- 4,889
- Bookmarks:
- 627
- Hits:
- 140,565
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Triangles Remind Me of Pizzas by Gamer_Mom
Fandoms: Undertale, undertale fandom, Undertale (Video Game), Undertail - Fandom, Underfrick - Fandom, Undershag - Fandom
06 Nov 2023
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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:
- 661
- Kudos:
- 2,056
- Bookmarks:
- 295
- Hits:
- 64,195
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Summary
She (reader) falls into the underground right after Dust has finished his own genocide route. They fall in love.
Just kidding, Dust doesn't have any emotions left.
...Unless?
Series
- Part 1 of Whispers & Handcuffs
- Language:
- English
- Words:
- 48,432
- Chapters:
- 23/23
- Collections:
- 1
- Comments:
- 231
- Kudos:
- 578
- Bookmarks:
- 85
- Hits:
- 11,153
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Bookmark Notes:
....this fic ... unearthed kinks i thought I would never .... eeeveeerrr.... develop.................. goodness
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Bookmark Notes:
太香了…特别好吃的murder乙女饭…有angry sex还有很多人外控狂喜的情节…完全符合xp……香得没边了(o^^o)♪
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Bookmark Notes:
8/10
21. (I haven’t finish this chapter ) He’s talking about that he wants to fuck her while she’s deadly…mhhh… Not my type of shit, I don’t know why)
23. Oh! Shit
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Summary
Blue had ever planned on anything like this.
You were his and his brother's mistress, but now. Thanks to that damned machine, he has to share you with so many others... Can everyone keep it a secret? Though, Mistress doesn't like secrets, but they have many of their own.