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Undertale Kinktober 2025 hypnosis edition by Chris_ghosty77
Fandoms: Undertale (Video Game)
30 Oct 2025
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Summary
New kinktober! One chapter a day for the entire month!!! With a list I made myself, very excited to show everything I've written.
Just like the other ones every chapter contains some form of hypnosis/mind control/brainwashing. I'll do my best to tag but i can't tag absolutely everything so look at the warnings at each chapter or in the table of contents.Series
- Part 14 of Undertail hypnosis series
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(or: these bitches do be in high school)
Just your regular high school au, nothing more.
Well, unless you count the folklore.
Series
- Part 9 of UT HSAU HELL
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We're back with another year of Inkwhumptobertale!
And this year, we have another twist: another list! That's right: every day, I'll be facing the challenge of eight different unrelated prompts, and I'll have to do my best to cram them all into the story, somehow. Admittedly, there is a low chance of me actually doing that, but I am obligated to use at least three prompts each day, and I'll add more if possible. I'd like to do at least one day fitting all eight prompts into the story at some point in the month, though. So..prepare for chaos!
These characters are not mine!
Series
- Part 4 of Writing Prompts
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Positivity falls and Destruction is left to pick up the ravaged (and melting?) pieces.
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This follows killer mainly, killer is trying to leave nightmare's gang after finding out that he's not the first eventually when he does leave he encounters many problems and a safe place.
This does tie into the diaries and katherine might appear but she will not play a huge role
I'm not the best at writing fix but I'm trying so if you have anything that you want to say and you critiques or anything let me know because it would help me greatly I also have trouble with being consistent so bear with me here
- Language:
- English
- Words:
- 457
- Chapters:
- 1/?
- Kudos:
- 1
- Hits:
- 11
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Summary
࿐ ࿔*:･ﾟ “ ᵈᵒⁿ'ᵗ ʸᵒᵘ ᵏⁿᵒʷ ʰᵒʷ ˢʷᵉᵉᵗ ⁱᵗ ᵗᵃˢᵗᵉˢ, ⁿᵒʷ ᵗʰᵃᵗ ᴵ'ᵐ ʷⁱᵗʰᵒᵘᵗ ʸᵒᵘ?…”
𝗜𝗡 𝗪𝗛𝗜𝗖𝗛. you let out your last breath, your baby brother eerily still in your arms, the only proof that you died trying to protect him.
your actions did not go unnoticed.
︶︶︶︶︶︶︶︶︶︶︶︶︶︶︶
Arc 1: Falling Behind (1 - 5)
Arc 2: Taste of LoVe (6 - ?) -
Unavoidable Outcomes by Crystalight532
Fandoms: Undertale (Video Game), Undertale Yellow (Master Sword Video Game)
28 Oct 2025
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Sans discovers the Multiverse, blames it on a bugged RESET. Humanity is curious on monster's abilities, wanting to see if they can weaponise them.
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A Multiverse Phenomenon drags Nightmare to a place that should be unreachable. Yet it changes the course of this Multiverse irrevocably.
Series
- Part 1 of Reflections in the Multiverse
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error gets squished by nightmare because i love torturing my favs (but then ink saves him) by ghostcatgirl
Fandoms: Undertale (Video Game)
28 Oct 2025
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The only thing Error can feel is pain the second Nightmare catches him. Even before the cold, slimy tentacle constricts around him, the contact and the terror are enough to make him fight for each breath.
The damp corruption seeps through his clothes quickly, feeling unbearably oily and sticky. The negativity is crushing, making it near impossible to feel even a little scrap of hope.
He tries to scream. It's just a painfully high pitched beeping sound, until Nightmare squeezes harder and it cuts off into static and he's forced into near-silence.
Nightmare lifts Error off the ground, bringing him close to his face. Error's eyelights are gone, replaced by warnings begging him to stop.
Nightmare hasn't even really done anything, yet.
[Part of a series, but can be read as an unrelated oneshot. Not canon to the series.]
Series
- Part 4 of awakening of a multiverse
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Undertale AU wordvomit because I have random ideas and would like a place to put them
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and yet i wonder if it was my fault
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Falling.
You were falling.
…Or were you?
You were weightless; both falling and floating; suspended in midair, nothing below your feet, but also no air flying past your face or whipping your hair around to tell of gravity’s play of hand.
And it was dark.
Suddenly, in the middle of the far distance, a white light appeared. With each passing second, it was growing bigger, bigger, and bigger still.
You realized, belatedly, that the light was drawing you in, tugging at your very being, and something about it was… awakening something within you.
The light grew closer, and your hope stirred.
You hadn’t wanted to die. You didn’t want to die.
You looked up into the light, and you reached out with everything you had.
With one final tug, the light pulled you into its embrace.
And just as tightly, you held on.
Series
- Part 1 of Falling Forward With You
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✨
He skidded to an unsteady halt as he finally got a close look at the two passed out Skeletons.“What the fuck?”
Blue didn’t swear often, but this? This definitely merited it.
✨Error and Ink are caught in a …little… accident and now everyone else is left to deal with the aftermath.
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Multiple universes are starting to collapse for no clear reason. Entire timelines are being erased, rewritten, or merging together in ways that shouldn’t be possible. The balance that once kept every AU stable is breaking down, and no one knows who or what is behind it.
As the chaos spreads, familiar faces are forced to confront the truth — something unseen is moving between realities, consuming them one by one. The protectors of creation must uncover the source before everything they’ve ever known disappears into nothing...
- Language:
- English
- Words:
- 1,918
- Chapters:
- 1/?
- Kudos:
- 2
- Hits:
- 9
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Summary
Having a picnic
Series
- Part 13 of I love love love Errorink!!
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i have hands for building altars， lips to pray to reckless gods， i was made to be a devotee by necropathy
Fandoms: Undertale (Video Game)
27 Oct 2025
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The Guardian of Negativity writhes in his threads as Error works, each twist of his body only tightening the noose around him. He’s nearly finished now. Nightmare should’ve known better than to step into this place—“business” or not. This isn’t an AU, not exactly—but it is his territory. And here, the rules bend for him.
The creators like him in this place.
Even now, their voices echo around him, clamoring with delight like a distant war drum, hungry and laughing.
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Disclaimers:
Several details in this fic are heavily inspired by 'Blue joins the bad sanses' comic, so go check that out
Canon innacuracies: Passive and Corrupted Nightmare are the same person, Ink is the creator and not the protector, Ink, Error, Nightmare, and Dream, are all gods, Blue, Killer, Horror, and Dust's specific au timelines were all destroyed, and i took liberties with how the void works. Also, no Cross sans will be mentioned, i don't know enough about underverse, and there will be some OC non-sans God/entity/things later on. The fic will be split into parts, each lasting nine chapters.
Schedule: Once a week, on Saturday, Sunday, or Monday, and i will post art or a reference sheet with every chapter. Trigger warnings will be specified in chapter notes. I've never written for undertale before, so please let me know what you guys think :3With that said, the actual plot: After an injured Error crashes into Nightmare and Co's home, a close bond starts to form between the two gods, both forced villains. In light of Ink's attempt to kill Error, Dream finally starts to lose it, and Blue gets dragged along.
Average chapter length is 500-2000
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Nobody asks to be a god footnotes/extras by Ev3lyn (Candle_The_Cat)
Fandoms: Undertale (Video Game)
27 Oct 2025
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now on ao3 as well as my tumbrl
this is bonuses for another fic. dont read it otherwise, it wont make any sense
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You are a shapeshifter with the rare ability to turn into an orange fox—a secret you’ve kept hidden, knowing humanity once hunted your kind. Living near Ebott, you slip into the night to run free, though the fear of discovery always lingers. Meanwhile, Sans and Papyrus have unknowingly welcomed a manipulative woman named Kora into their lives.
Behind her sweet facade, Kora is a gold digger using the brothers for wealth, status, and comfort, willing to lie, fake affection, or even blackmail them if needed.Eventually Kora stumbles across your apartments terrible condition, deciding to become “friends” with you and inviting you to stay in the mansion with her and her apparent mates. It started off fine, until she began to spread lies— rumors.. Even blaming you for mistakes, stealing. And god who knows what else.
Maybe you can help these skeletons see past whatever game she’s playing at? (Anti-Harem, That’ll switch into a actual harem..)
As well as machine chaos.
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Error has a single, thankless job: tear apart every last abomination Ink dares to call an AU. It's routine. Easy. And mind-numbingly boring as hell now. And no matter how many universes he erases, the voices never shut up.
And when Nightmare offers him a place to crash—complete with chocolate and silence—Error sure as hell didn't accept it.
But he doesn’t throw the offer away.
Something’s building in him, and for once, it’s not just rage. It’s something worse.
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Or, how Error slowly gets closer to Nightmare's gang (as much as he begrudges it).