1 - 20 of 213 Bookmarked Items in Ecto-Tentacles (Undertale)
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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
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:
- 37
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tbr
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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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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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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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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:
- 1,098
- Bookmarks:
- 136
- Hits:
- 44,375
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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:
- 312
- Hits:
- 52,910
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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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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
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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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:
- 492
- Hits:
- 86,467
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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
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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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:
- 582
- Bookmarks:
- 116
- Hits:
- 16,198
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Summary
In a Multiverse where Ink and Error retire together after falling in love. Dream is now the new leader of the Star Sans and protector of the multiverse.
With Error no longer a threat, Dream focuses his effort in pacifying the other big threat to the multiverse, his brother Nightmare. In an attempt to cure his brother of his curse of negativity, Dream uses a rather volatile serum from a rather lewd AU.
How will this series of events play out? And how will the multiverse fair without Ink and Error?
Relationships/Ships:
Nightmare/Killer (Killermare)
Error/Ink (ErrorInk)
Underlust Papyton & Sansby-
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Bookmark Notes:
Best of the best nightmare x killer senses,
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Summary
It was an accident.
He didn't intend to walk in on you taking off your clothes before going to the bathroom.
... Tonight was going to be an exciting one.
And he won't be the only one enjoying this.
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Horror is starving.
Horror is starving and he won't (can't) eat and all he wants to do is die.
Worried, a bunch of people team up and make a difficult decision in order to help him. There is no telling what this might lead to, but it could have disastrous results-or be what some of them finally needed.Please read the tags!!!
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Bookmark Notes:
Low key ate, hoes mightve had all their problems solved with the concept of a breat pump but its fine /silly
The way horror is written is really cool, boarderline feral, the bare least of saniry being the only thing keeping anyone (sans!classic) safe, completly starved from food even after months of not years outside his own AU, and generally just prett angst in desperation
Also cool tidbits im stealing:
- Horror being able to reconise people based on smell
- someone who isn't used to having ecto summoned being unbalanced when they summon for the first time in a while
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Summary
NOTE: ZR is on hiatus and due for a big edit spree. If you're interested I recommend holding off til that. You'll know it's changed because the new title will be 'Echoes in the Distance.'
Dark Fountains sealed and ancient malice dispersed, the heroes won the day. But the cost to them is clear, their sins crawling on their backs and the loss festering in what remains of their SOULs. As they struggle to recover from their wounds, with the strings of destiny lying limp in the past, they must choose for themselves who they are and who they want to be. Far from Hometown a lone human girl looking for humanity's lost history resolves to explore a mountain, and winds up thrust into the midst of a story long since over. Will her selflessness help to heal, or will her selfishness only cut deeper?
A sequel set years ahead of the original Deltarune with many themes about gender, healthy (or not) relationships, and kink. Oh yeah it also has tons of hot monster [#$@!] with huge [pipis] and a lot of other [HYPERLINK BLOCKED]
This is the 'all chapters in one story' version. If you want to avoid certain kinks or w/e the series page can be found here: https://archiveofourown.org/series/2552605
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Summary
Mermay 2025 NSFW Bingo. Prompts by Sku, Creator of Leviathantale.
⚠️ The Explicit warning is for porn.
⚠️Check out each Chapter summary for warnings ⚠️
*Chapter 1 has bondage and tentacles. Pairing is Error/Ink/Blue
* Chapter 2, Geno/Reaper, prompt Bites and Licks
* Bites that cause blood
* Excessive saliva
* Chapter 3, rated for violence, against human Poachers.
Pairings, the Leviathantale Shiver.Series
- Part 1 of MerMay 2025 Bingo
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Summary
You’re an ordinary human. A decent person, if anything. Kind, and gentle.
He should’ve hated everything about you.
But... he doesn’t. The fact couldn’t be further away from that.
He’s obsessed with you, and he lets you know through the countless nightmares he feeds you every night he visits.
And soon... You’re going to become his.
Series
- Part 2 of Requests
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