Undertale books
13 stories
An Undertale story by Serynos
Serynos
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The Barrier was broken. The monsters were free. But what happens when Humans aren't all that friendly and start a slaughter? How will Monsters save themselves this time, without the power of Reset? The cover image does not belong to me. Also all the art here is not mine. Undertale characters belong to Toby Fox. This is my first fanfiction and also the first time I write anything in English. There could be a lot of grammatical errors. Please, don't be too harsh in your judgments.
Sans' House Guests (CreepyPasta x Undertale) by BubblyShip
BubblyShip
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    Parts 27
The surface was not what Sans thought it would be. Lack of communication skills, communication in general, and social interaction had driven him into a depressed and anxious state of loneliness so deep that it'd take a gang of serial killers to help drag him out and fix his problems. Literally, it took a gang of murderers called CreepyPasta just to set things right. The world acts in funny ways. (REWRITE IN PROGRESS - Be warned, this story is old and is not properly written to handle certain topics regarding mental health.)
Hiding in Sight (Sans and Papyrus GB Story) by SpiritWolfNura
SpiritWolfNura
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    Parts 14
Dr. Gaster made 1-S and 2-P to break the barrier and start a war. When he disappeared, they were scared, confused, alone. They broke out of their prison and Grillby raised them. Many years later, they are on the surface and he comes back. They don't want to go back though.
Surprise Attack! by GhostlyAshamed
GhostlyAshamed
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    Parts 4
Sans was always in a genocide route, forced to fight over and over. He was slowly growing more and more Insane each RESET. Ink who accidentally summoned a portal to undertale with a few Sanses. They meet Sans and start to fall for him. But will they confess before the human shows up?
New Baby (Sansgoriel Oneshot by BubblyShip
BubblyShip
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    Parts 1
Sans has a one night stand with a stranger and gets pregnant. He is not very prepared. Fortunately, Asgore and Toriel are willing to help! (First Sansgoriel fic on Wattpad, I believe! (I do have a second in my drafts, do not fret, for it is a long, story driven thing with a whole plot and everything). Also, cover is mine.)
A Knocking at the Door by thatonefangirltho
thatonefangirltho
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    Parts 27
(Underfell AU) Sans, badly beaten by his brother, goes to his friend from the ruins for help. But with his injuries and his dissaperaence from Snowdin, what is to come on both sides of the door?
Magic and Bones by Extremicatia
Extremicatia
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A genocide run ends with Frisk smashing Sans legs into pieces, killing him, the kid resets and his magic is left to figure out a way around this problem. (UNDERTALE) Hope you all enjoy! p.s. the cover is my art I draw traditional (on paper)
Vamp dream (discontinued)  by arsonellapastaburned
arsonellapastaburned
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    Parts 26
One night dream was taking a walk in the woods until a vampire bite him
Gaster Blaster Sans by MiaSmith344
MiaSmith344
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    Parts 13
My first story that doesn't contain ocs. Yay. Sans was visiting Alphys and is doused with some chemicals from one of her experiments. What they don't know is that these chemicals are going to change Sans in ways no monster even considered possible.
Trust   •〖Baby Blaster AU〗*NOT MINE* by UnderDiscontinued
UnderDiscontinued
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There have been strange reports in Snowdin. Reports of small skeleton children. Reports of strange small skeletal creatures. All Grillby knows is that someone...or something...has been raiding his trashcans after night. He intends to find out who or what they are, and perhaps if they allow it, to help them... **WARNING: Depictions of Self-Harm, (Child) Experimentation, and Past/Referenced Child Abuse. Themes of PTSD and Trauma are present. [COMPLETED] SEQUEL: https://archiveofourown.org/works/17140850 ------------ © ALL CREDIT GOES TO @SPACEGATE ON TUMBLR AND/OR @KEETAHSPACECAT ON AO3! THIS IS JUST TO LET MORE ATTENTION TO THEIR WORK IF YOU HAVE NOT SEEN IT BEFORE! © @SpaceGate on Tumblr @KeetahSpaceCat on AO3 (They're the same person)