Undertale
40 stories
The SS mental hospital (Sanscest) by Pear_Milk
Pear_Milk
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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
Forbidden Experiments by TheKittenWhisperer
TheKittenWhisperer
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From what anyone could tell, the Multiverse was at its most peaceful time from what they could remember. There was only one threat to worry about, and it was not as destructive as a past one. The known Multiverse was almost perfect. Hidden in darkness though, lurks greater evil... Danger... And mystery. When aus begin to disappear after multiple months of peace and no worries, the creator and destroyer are dragged into the mess. This time though, it's a new unknown threat attacking the multiverse, yet it appears familiar at the same time. Too familiar.... ••••••••• This is an Undertale AU, Sanscest ship story! And a sequel! If you haven't read the first book, - Forbidden Friendships - Spoilers lie ahead! Also, this story contains the following: sanscest shipping, fluff, suggestive themes/scenes, murder, and mad scientists If you are uncomfortable with such themes, you've been warned. •••••••• All characters belong to their rightful owners. •••••••• Updates are temporarily paused
Wilted [ Sans x Flowerfell! Reader ] by morrow-
morrow-
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You were afraid. For the first time in your life, you were truly afraid. You weren't afraid of the never-ending darkness that had now consumed you. You weren't afraid of the monsters underneath your bed. You were afraid of the flowers.
Forbidden Friendships by TheKittenWhisperer
TheKittenWhisperer
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When protector of the Multiverse, Ink, and destroyer of the Multiverse, Error, get tricked into taking part in a social experiment, things slowly get out of hand. When an unexpected scientist realizes who another scientist is experimenting on and gets curious, the creator and destroyer face an adventure they've never imagined. The worst part for them? They're stuck facing it together in order for them both to get out alive. When two of the Multiverse's biggest enemies are forced to rely and trust each other, will they manage? Will their own beliefs lead to their demise? Or will an unlikely, morally forbidden bond grow and blossom? Read "Forbidden Friendships" to find out. ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• For those who don't know, this is an Undertale AU story that does contain sancest shipping and fluff. Also, all characters in this story belong to their rightful owners, and the original game of Undertale all characters are based on belongs to Toby Fox. .-Story Status: Completed-. Finished this story already and want more? Read the sequel "Forbidden Experiments"!
Creative Love (Ink Sans x Reader) by Sillychick120
Sillychick120
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You have know Ink since well, since forever! You were dropped off with Ink when you were young. He became your only friend. You had found out that you were supposed to help Ink protect the AU's and so you did, little did you know that you soon fell in love with him. Will you tell him? Or keep it to yourself? Read this story to find out!
Souls {Multiship Sanscest Story} by Apathetic_Blossom
Apathetic_Blossom
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Ink has a lot of problems, unfortunately it takes a falling out with his best friend, and a very strange roommate to make him realize that. Or, Ink's a bitch who gets a well-needed wake up call, with everyone else's problems in between. Disclaimers: -Lots of cursing -Unfunny humor -A bit of violence -Character death Any warnings will be added to chapters they pertain to, enjoy <3
Target Settled|Outer!Sans x Killer!Sans by LaliaShy
LaliaShy
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|UNDER EDITING| Killer was loyal to stay within Nightmare's team, little to no emotion with no worries, until he stumbled across a beautiful alternate Universe. Upon meeting the sans of this universe, will Killer treat him the same fate as he once did in genocide or will he spare his life? -WARNING This Story Includes- -Swearing/Inappropriate Language -Dark Themes -Suicidal/Touching Themes ----------------------------------------------------------------------------------------------------------------------------------- Ah a Sanscest Fan-fiction about Outer and Killer, I wanted to do a fan-fiction of these two as I don't often find any stories of these two that isn't from the NAJ AU, so i just wanted to. To be honest I don't know much about either sanses but i'll try my best to at least get somewhere decent of their personalities. Undertale Belongs to Toby Fox Outer!Sans Belongs to 2mi127 Killer Sans belongs to Rahafwabas And Other Au's Belong to their Respected Owners Cover Belongs to Me Started- 31st July 2018 Finished- 12th December 2018 ~30 Chapters~
Forced Resets (Sans x Reader) by Determined_Reader
Determined_Reader
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Your name is (Y/N), or seven as you call yourself, and you have tried all you can to stop these resets. Its not you nether is it Frisk. You don't know who it is. It is almost at the 100,000 mark and you can't help but notice some changes going on. And your not the one causing them... You may need some backup.
Chainsmoker [ Gaster!Sans x Reader ] by morrow-
morrow-
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Routine. The entirety of every living thing is dominated by it, human or monster. Everything HAS to be the same. It was in this that you were the exception. For you everything was new, every time line a detailed altered in order to satisfy your sadistic desire for a new ending, whether it be only a few details of dialogue altered or something else entirely. Monsters you once considered family you now butcher and slaughter without a second thought, after all, that's what the Reset is there for, right? And all at once it stops. Your small hold over the Underground is ripped away from you and you are thrown into a dying timeline, monsterkind's final attempt at self-preservation. You're alone, completely and utterly alone. Except one. And he has a bone to pick with you.
When the Multiverse Falls {On Hiatus} by stillmirus
stillmirus
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    Parts 10
The Universes have crashed together, and all that is left is a barren wasteland of mismatched code. The creator has gone missing, the balance no longer exists, and many have died. However, there are a few who have made it through the Fall. These are the survivors. What will happen to them after Multiverse Falls?