1 - 20 of 213 Bookmarked Items in Ecto-Tentacles (Undertale)
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It’s a very… delicate time of year. Or so you’ve been told; you can’t say for certain that you’ve ever been around a monster during their Season. Your stay at Nightmare’s castle has certainly prepared you for all manner of strange and unusual occurrences, but this?
This is a whole different beast.
Series
- Part 2 of PROPAGANDA
- Language:
- English
- Words:
- 35,529
- Chapters:
- 5/?
- Collections:
- 2
- Comments:
- 173
- Kudos:
- 583
- Bookmarks:
- 119
- Hits:
- 16,347
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rose petals in bird cages by Anonymous
Fandoms: Undertale (Video Game), Death Note (Anime & Manga)
31 Oct 2018
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Summary
31 days of sin.
- Language:
- English
- Words:
- 26,760
- Chapters:
- 31/31
- Collections:
- 2
- Comments:
- 35
- Kudos:
- 385
- Bookmarks:
- 30
- Hits:
- 21,099
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Summary
A bunch of different versions of Sans' and Papyrus' across the multiverse for NSFW headcannons
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Reader inserts by CosmicBrowniez (Shatterflowerdemon), Shatterflowerdemon
Fandom: Among Us (Video Game), Five Nights at Freddy's, IT (Movies - Muschietti), IT - Stephen King, Undertale (Video Game), Your Boyfriend (Visual Novel), どうぶつの森 | Animal Crossing Series, 僕のヒーローアカデミア | Boku no Hero Academia | My Hero Academia (Anime & Manga)
13 Nov 2024
- Words:
- 263,331
- Works:
- 73
- Bookmarks:
- 28
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What Happens in Space Vegas (Never) Stays in Space Vegas by Acoustic_Meatus
Fandoms: Undertale (Video Game)
28 Sep 2025
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Summary
Sans and Red's semi-annual weekend bender in Space Vegas takes an unexpected turn.
Or, the boys wake up in the aftermath of a hasty Space Vegas Wedding and consistently fail to make any wise decisions.
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Bookmark Notes:
f
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Summary
Nightmare is more than just a bad guy. He and his poly protect others, too. Maybe they can help Blue out of a bad situation.
Series
- Part 9 of Underswap #832
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Summary
Dream and Nightmare are forced to take care of their alternates, lest they cause chaos (Dream) or get themselves killed (Nightmare).
- Words:
- 28,615
- Works:
- 9
- Bookmarks:
- 39
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Summary
After securing a work placement at the CORE, you begin to fall ill to some mysterious disease. Unfortunately for you, your boss is W.D Gaster, and he has taken interest.
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Ch.22
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Summary
A broken reset sends Sans back to the very beginning. With only Sans and Flowey containing memories of previous timelines, they struggle to survive in a new, even harsher Underground. While Sans fights to stay alive, he looks for a way to get back to his brother. But living in a timeline where Papyrus doesn't even know Sans exists makes things much more difficult.
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5
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The Sacrificial Skeleton and the Labyrinth of Gods by this_is_my_alt
Fandoms: Undertale (Video Game)
19 Nov 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:
- 247,635
- Chapters:
- 51/60
- Collections:
- 1
- Comments:
- 1,185
- Kudos:
- 2,451
- Bookmarks:
- 493
- Hits:
- 86,702
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Bookmark Notes:
Last read: Chapter 51
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Bookmark Notes:
up to ch. 51
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Bookmark Notes:
Ch.23
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Summary
Nightmare has always been distant from his gang for multiple reasons. But deep down, he does love them. How does he show his affection towards them while having plausible deniability? Sex.
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Summary
Two short oneshots of Fresh and fetish-y fun stuff
Warnings that I couldn't find tags for will be in notes
Also, this is mainly going to be for fem readers, apologies, but that's my only perspective "^^
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Summary
You honestly can't remember when you had officially moved into the lodge to be with your datemate. It started as leaving things in his room under the (flimsy) excuse of having stuff for the next time you have an impromptu sleepover—but it was a not-so-subtle takeover.
The others didn't mind it either and were gracious enough to provide you with your own room for when everyone's shenanigans prove to be too much for you, but little did they know that they practically invited the devil herself into their home, because you're the queen of starting some bullshit or doing things for the bit.
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Bookmark Notes:
2- I like the nicknames for the guys.
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Bookmark Notes:
My lovely friend Liliths work <3
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Kinktober 2022-The Dumpster Fire Edition by RubyDracoGirl
Fandoms: Undertale (Video Game), Deltarune (Video Game)
21 Sep 2023
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Summary
Hey ya'll. It's ya girl, Ruby, coming back for a round three of Kinktober. Am I here to fuck some skeletons (and maybe other Undertale monsters) for a month straight? Hell yeah, I am! And just like the previous times, I am completely unorganized and mildly unhinged =)
- Language:
- English
- Words:
- 85,968
- Chapters:
- 22/31
- Comments:
- 185
- Kudos:
- 1,099
- Bookmarks:
- 136
- Hits:
- 44,459
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Bookmark Notes:
15
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Summary
Sans gives in to the temptation to paddle the pink canoe one night in an inappropriate venue and then pretty much just keeps making bad decisions. Papyrus is surprisingly onboard.
Series
- Part 1 of Euphemisms
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Bookmark Notes:
I WAS ON THE EDGE OF MT SEAT THIS IS SO GIOD
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Summary
Mermaids are the social butterflies of the sea, living in sunny, shallow water together with the rest of their school. On the other end of the spectrum, meroctopuses are violent, antisocial fucks who like the cold and the dark, and who basically kill any competing predator they see.
But they aren’t stupid.
Red is proof of that, using his traps to hunt for food and saving his energy to ward off predators. So, how does he react when he finds the laziest creature in the ocean stealing his catch?
Bribe him with more food in exchange for peaceful company, of course! The ocean is fucking lonely for giant predatory mer!
Red unwittingly gets saved by those peaceful conversations. Apparently even a cold-hearted predator can fall in love. And from there, their family keeps growing as more lost souls are saved by the siren’s call that sings of peace, love, and family, no matter how terrible of a monster you were in the past.
- Language:
- English
- Words:
- 225,104
- Chapters:
- 77/?
- Collections:
- 1
- Comments:
- 2,076
- Kudos:
- 1,836
- Bookmarks:
- 311
- Hits:
- 52,942
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Summary
Error and Nightmare both have a fascination with the same human... you.
You're aware that your world is nothing more than code, and it irks you, deep inside.
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- Words:
- 25,528
- Works:
- 2
- Bookmarks:
- 7
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All of my smut pieces in one convenient place. May Dog have mercy on my SOUL.
- Words:
- 47,779
- Works:
- 3
- Bookmarks:
- 17
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Summary
When I reset the world, he's the only one that remembers...
I'm a masochist, he's a sadist...
I don't believe in destiny, but if there was ever a mate meant for me, it would be him.
Fuck, would it be him.-
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