Undertale and AU's
12 stories
The game won't end until the KING falls [Killermare] by puddle_of_creativity
puddle_of_creativity
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    Parts 12
Nightmare lost everything. Everyone left him the moment he showed weakness, even though that was when he needed them the most. Killer stayed. Killer wouldn't leave him. Killer would always be by his side. He had sworn to do it. So Nightmares figures were gone except for the king and queen, had either defected to the opposing side or simply left. Dream clearly had the upper hand in this game. But nobody expected outside interference. The only question was which side they swear their loyalty to. Will it be the warm, intense sun or the cool, gentle moon? [Besides my Ocs, I don't own any of the characters]
The SS mental hospital (Sanscest) by Chipper_Ship
Chipper_Ship
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    Parts 46
Cross is taken in by a new Mental Hospital. A better one. But is it really a mental hospital? Or is it a sanctuary where he is destined to find love. What happens when the enemy finds this place? (I'm not good at describing stories sorry) Ships: Drink Errormare Crerror Crossmare Outerkiller Kustard Bloodlust Dustberry Afterdeath Food Scientist (Sci X Farm) Epic 80s (Epic X Fresh) Crerrormare And a bit of Bette X Chara All characters belong to their rightful owners Started: May 10, 2021 Ended: August 30, 2021 Ranks: #1 Crossmare: January 26, 2022 #1 Afterdeath: February 25, 2022 #2 Crerror: July 27, 2022 #1 Errormare: August 2, 2022 #1 OuterKiller: September 6, 2022 #1 Crerror: September 22, 2022 #1 Sanscest: April 8, 2024
{🍋LEMONS! 🍋} by DorkiestMacaroni
DorkiestMacaroni
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    Parts 2
"DS" stands for "DreamSwap" if you didn't know. Here's the swapping that I know of: Cross - Ink {& Vice-Versa} Blue - Error {& Vice-Versa} Dream - Nightmare {& Vice-Versa} There may be others, I just can't remember them. Anyways, enjoy!
Sanscest one-shots {requests closed} by idkTbh1273
idkTbh1273
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    Parts 45
Uhhhhhhh- Hellloooo ! You know what this is boys ( ͡° ͜ʖ ͡°)
~Afterdeath~ NSFW 30 Day Challenge by XLotusGardenX
XLotusGardenX
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    Parts 8
The Title Says It All ;) Geno belongs to Loverofpiggies/Crayon Queen Reaper belongs to Renrink Sans belongs to Toby Fox Undertale belongs to Toby Fox and Temmie Chang (Title is from 6agentgg9)
Dysfunction to Refunction by BlindBones
BlindBones
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    Parts 39
Balance was tipping in the Star Sanses' favor and Nightmare can't keep up. He needs to make his own group to balance out the multiverse. Is recruiting the Bad Sanses really about balance, though? Or because of something else...? Cover by me No beta, we die like men #1 in balance
Reaching For the Final Exit (Suicidal Nightmare) FINISHED by snek_snek
snek_snek
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    Parts 18
Nightmare had been suffering with deep depression for his entire life. And when I say ENTIRE, I mean entire life. Though, it'd been getting worse with each passing day till suddenly the overwhelming, hurting, uncontrollable feeling of wanting to disappear just stopped bothering him. The feeling became numb. Then empty. Till suddenly it was the only thing that'd make him happiest. The feeling of death, The pain The emptiness It all made him want it. To know what it felt like. Nightmare wanted to die. So much
A Coincidence (Sans X UF Sans) Sanscest by beepalexander
beepalexander
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    Parts 9
Sans finds himself in the UnderFell universe when something goes wrong with his teleportation magic. Finding himself next to the door where he speaks to the mysterious lady who makes him laugh, he thinks nothing of it. However, noticing something different, he becomes unsure. That is until he meets a mysterious look-alike blocking his path... NO SMUT / LEMON Maybe fluff ;)
Showtime (A Sanscest Story) by carelesscreativity
carelesscreativity
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    Parts 77
Cross has had it. There is only one place left for him to go and he just HAS to find it. Escaping an abusive father, he seeks the Circus. A spectacle of performers and animals. But once he's there, things aren't as they seem. Ships: Crossmare Errink Kreme Horrorlust Afterdeath Dustberry WARNING: SAD