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Undertale Kinktober 2025 hypnosis edition by Chris_ghosty77
Fandoms: Undertale (Video Game)
09 Oct 2025
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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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Red Bones (Uf!Sans) won a scholarship at the St. Wendell Ebott University, a secluded University in Maine, and goes abroad to study at the Tōkyō Rika Daigaku (Tokyo University of Science) to become a Bachelor of Science. With his late father’s last savings, he flies to Tokyo and takes residence there.
Sans Serif (Ut!Sans) is offered a position as a teacher at the prestigious Tokyo University of Science. Having won a Nobel Prize in Physics 20XX for his findings in quantum physics, studies of multiple alternate universes and The Void. He is ready to impart his wisdom to the masses as a part time professor.
What happens when these two collide?
Drama unfolds!
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Sans was disgusting.
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The Castles newest additions are trying to adjust to the change in their lives. Living amongst an Outcode and his subordinates. One in particular the castle residents seek to keep hold of. Past and current wounds have made that rather difficult for them to convince this individual. Will they choose to show a side of them that most don't see?
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- Part 4 of Kaleidoscope
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Edge is visiting the castle while Red is spending time with Dust. Killer is bored and suggests they spend time getting their rocks off together.
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- Part 1 of Kinktober 2025
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Day two with Edge and Blue, hopefully not what you would expect
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- Part 5 of Kinktober 2025
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The king has fallen.
In the devastation left in the human's wake, a new king is needed. Papyrus steps up to the challenge, assisted by his brother.
Sans is sworn to obey the crown, bound by the Delta Rune. Regardless of who wears it.
But when dark alternates show up and threaten war, Papyrus has to make the hardest decision of his life, and Sans finds out the chains that bind him might not be as secure as he'd like.
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(rewrite)
He flinched hard as a skeletal hand bigger than his torso came to lay on his skull, gentle in all the ways it shouldn’t have been. It simply laid there, claws careful not to nick him, before warm breath came next to his head.
“Good boy. I will take care of it.”
Sans blinked, tears dotting his sockets as it finally backed away, staring down in him with an unknowable expression.
“You… you will?” Sans asked, voice trembling, quiet and meek. It stared for a moment before nodding once.
“Yes. But it will not be pretty. Go to your bedroom, shut and lock the door. Do not come back out until I tell you it is okay.”
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Okay, so admittedly none of this has gone entirely according to plan.
Actually, most of it did the opposite of that.
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OR:
Sans runs afoul of some pirates once or twice, and it turns out there are a lot of things he doesn't know about the universe at large - things he really wasn't ever supposed to learn.
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Mutt has been fighting a heat all day, fantasizing about what his lord would do to him once he saw how disgustingly horny his pet is. Once Razz comes home, he takes pity... only to back out the moment Mutt became too much trouble.
A horny Mutt has to do what they need to do in order to get that itch scratched.
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Starting kinktober with our OGs, Sans and Papyrus
Hope you like itSeries
- Part 1 of Kinktober 2025
- Language:
- English
- Words:
- 1,036
- Chapters:
- 1/1
- Kudos:
- 14
- Hits:
- 166
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Kustard Week 2025 - a PIE RAT's party-life for me by Anjel_X
Fandoms: Undertale (Video Game)
30 Sep 2025
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Sans and Red are at the yearly all Skeleton Multiversal costume party and as usual, they put as little effort into their costumes as they can.
This is my fic for this year's Kustard Week using all the prompts in one shot.
This fic is set in the same 'world' as the ones i did for Kustard Week 2023, Fontcest May event 2024 and chapter 9 of Skelemonth 2024 and happens in the nebulous future (so there will be references to those fics)
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This takes place in a post Underfell King Papyrus ending.
Struck by under population, King Papyrus makes it law that all monsters left alive by the murderous little human have to procreate. This leaves Fell!Sans and The King himself in a tight spot. There are no female skeletons left in the whole Underground and both skeletons are sure they are the last of their species. Fell!Sans proposes something. With the help of the first Royal Scientist's machine to travel to other universes, he will find mates for breeding purposes.
Tale!Sans is having his first sub heat as a female. This happens when there are only males left and the strongest one undergoes a gender swap. He knows this means Papyrus will have to be his mate.
That won't do. They are brothers, for the Angel's sake! So he does what he does best, HE RUNS.
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“I just... I’m not sure if it’s a good idea, Paps. We’re barely allowed outside our living quarters, let alone outside of the lab…”
“COME ON, Sans! I’m almost 11 now! I should be able to go outside! You’re 16 and you’re telling me you haven’t ever wanted to see beyond this cramped place? I just want to enjoy my birthday OUTSIDE of the lab! I don’t think it’s the crime you’re making it out to be.”
“It doesn’t really matter, though, does it?”
“Maybe not to you, but it means a lot to me!”
"I think I have an idea."- Language:
- English
- Words:
- 3,186
- Chapters:
- 1/?
- Kudos:
- 10
- Hits:
- 105
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Progressive || ErrorInk || High School AU by Flynn (FlynnWritesToo), FlynnWritesToo
Fandoms: Undertale (Video Game)
22 Sep 2025
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Ink notices that someone has started watching him again lately, so in order to stay safe, he and his friends make a plan for him to pretend to date someone.
That someone is Error, who is not at all excited to go through with this, especially with the huge crush he's had on Blue since he was a kid.
However, the more these two pretend, the more fun they have. What will happen between the two? Will Ink's stalker leave him alone, or will it take a turn for the worse?Series
- Part 2 of Progressive Archive || Sans AUs
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It has been five years since the monsters emerged from the underground and with it humans that have turned into monsters. There is currently three skeleton invertos being held. A mother and her two children
Another inverto fic but with my little twist on it.
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On his twenty-third birthday, Prince Edge is given a gift: a courtier to begin his royal harem, hand-selected by his father.
Trouble is, Edge never really wanted a harem.
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- Part 2 of One More Love
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The Puzzle Honey Bandits are at it again!
Their reign of terror must end!
We all know they are monsters who only burgle other monsters.
What fiends they must be?
Who would dare?
They need to be brought down, by any means!
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Habiendo aceptado su nuevo cargo como rey del subsuelo, Papyrus aún tiene que asimilar el hecho de que ya no tiene toda la atención de su hermano.
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- Part 1 of Aporte para #IncestemberWeek
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The Fell monsters have never gone into heat before, have never heard of it. Now that they've reached the surface, though, it's only a matter of time before biology reasserts itself.
Few of them are taking the news all that well.