Undertale
19 stories
The Retriever Institute  by SomeGayMoth
SomeGayMoth
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Luck and happenstance are two different things, and there's no telling which is worse. Both of these things bring X to a new kind of hell. After being held as a subject of illegal soul experimentation for years, breaking out, and burning the damned place to the ground, X is finally rescued. Though, he never really thought about what would happen after he escaped. As it turns out, his journey to recovery is a long one.
Hopelessly Devoted To You (Crossmare) by An0nym0uS_H3dg3h0G
An0nym0uS_H3dg3h0G
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He had been serving 'the one who takes' for quite some years. Most of the creatures in the batches of new recruits either died or betrayed their king. But Cross would never do that. The god had given him a home, friends, a new purpose, a second chance at life to prove his worth. In exchange Cross served him, stayed by his side, devoted his life to him in such a manner that it almost could be called worshiping. He was a god, afterall. Cross knew he would do anything for Nightmare. He'd kill for him, had killed for him, he'd protect him, even die for him. And if that couldn't be achieved, well, then he'd die with him.
A Game for the Admin by Lunaria_maharlika
Lunaria_maharlika
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Boredom. Boredom was what lead to all of this. Cross, the admin, had decided that he was bored and wanted to play a game with the people in his multiverse. The game of balance. The game of balance between, positivity, negativity, creation and destruction. It doesn't matter what happens, how many people and monsters get killed or the amount of AU's his game will destroy. In the end, he will still be the hero of this-HIS multiverse.
Insomnia: Dreamcatcher! by AppleBloomer1
AppleBloomer1
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(Art is NOT mine) Note: This is a commission from a friend! With that in mind, some themes may drift away from my usual line of work. Specifically to darker themes. Error considered himself a genius. I mean... His plan sure was something! Hit Ink where it would hurt the most! Stealing his girlfriend right out from under him! Though he may face some minor consequences for his actions... Along with some... Unexpected feelings within his soul.
Rising in Ranks (Crossmare) by AppleBloomer1
AppleBloomer1
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So this is just a prequel to Loyal Servant. I doubt this will follow much of a cohesive storyline, and the chapters will all probably be much shorter. It is essentially whatever small little things I write at random. Just some background on Cross and Nightmare which might give more insight on their current relationship. Enjoy.
Sanscest Oneshots! by nicky1000000
nicky1000000
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Requests are CLOSED! Please read first page for all the info! (Not permanently) 🍋Lemon ☁Fluff 💀Angst
~Sanscest Oneshots~ by Shhshsuudy
Shhshsuudy
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Requests open! Fluff: ☁️ Angst: 🖤 Crack: 💥 Sin/Lemon: 🍋 #2 in sanscestoneshots on Friday 16th April 2021 #1 in sanscestoneshots on Tuesday 15th June 2021
Sanscest Oneshots {Ended} by But-No-One-Came
But-No-One-Came
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An old Sanscest oneshot book. Closed, moved accounts to @anomalousmultiverse
Sanscest Oneshots by cheyburger07
cheyburger07
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Multiship Requests are no longer open as I've been completely burnt out and have been questioning if my writing is even good Btw my head cannons have changed heavily since writing some of these chapters None of the art is mine unless said other wise a majority of the art in this is found off of google and I barely ever think to check who made it so all art belongs to their respective owners
Leviathantale oneshots (Requests) by idontknowgenders
idontknowgenders
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A ton of random Leviathantale oneshots cause it's under-rated Angst Fluff no smut Requests open Only request here