Underswap Stories

1.2K Stories

Sans AU X M!Reader by KeyraThalita12
#1
Sans AU X M!Readerby Keyra Thalita
(m / n) (L / n) is a 19 year old boy and he is frisk's cousin, (m / n) always looks after frisk like his own sibling because since childhood frisk has always been treate...
What a Classical turn of events! by DahRadSkeleDude
#2
What a Classical turn of events!by JJ_loves_Ruru
edit(Now that I think about it a bunch of random crap is gonna happen) Error (the FGOD) is wounded badly in a fight between him and ink. and randomly portals to the or...
Bone of Contention (Underswap Papyrus X Reader) by TheIndianaCrew
#3
Bone of Contention (Underswap Papy...by Indie
Humanity is divided over one thing---the Monsters' reappearance. Some believe that they should stay aboveground, and others think that they should be sent back to where...
𝙻𝚘𝚟𝚎 𝚊𝚛𝚘𝚞𝚗𝚍 𝚝𝚑𝚎 𝚌𝚘𝚛𝚗𝚎𝚛 𝚜𝚝𝚘𝚛𝚎 by MerryJane8
#4
𝙻𝚘𝚟𝚎 𝚊𝚛𝚘𝚞𝚗𝚍 𝚝𝚑𝚎 𝚌𝚘�...by Bitxhy
(ᴠᴀʀɪᴏᴜs sᴀɴs ᴀɴᴅ ᴘᴀᴘʏʀᴜs ᴀᴜs x ʀᴇᴀᴅᴇʀ) ||ᴀɴᴅ ᴛʜᴇɴ ɪ ɢᴏ ᴀɴᴅ sᴘᴏɪʟ ɪᴛ ᴀʟʟ ʙʏ sᴀʏɪɴɢ sᴏᴍᴇᴛʜɪɴɢ sᴛᴜᴘɪᴅ ʟɪᴋᴇ "ɪ ʟᴏᴠᴇ ʏᴏᴜ."|| Life was merciful enough to grace you...
Hidden for so Long (Sans AU x Reader) {Remake} by RandomWriter-Chan
#5
Hidden for so Long (Sans AU x Read...by Just Here & Thinking
Long ago, two races ruled the Earth: HUMANS and MONSTERS. One day, war broke out between the two races. After a long battle, the humans... wait no, the monsters were vic...
Reborn as fellswap san and now I'm kinda blind!? by KarmaAkabane425
#6
Reborn as fellswap san and now I'm...by Karma Akabane
What if..someone from our world was reborn as fellswap sans? But an accident when he was young leads to becoming blind for a long time and papyrus feels guilty about not...
[You're Not Alone] Underverse Cross Sans X Reader by Kim__chan
#8
[You're Not Alone] Underverse Cros...by Kim
You were a kind human who has a brother named Frisk. You and Frisk always get along until both of you climbed up a mountain. very curious if the legend was true or not...
|| Catching Feelings || AU Sanses x Reader! || by sydneysayshello
#9
|| Catching Feelings || AU Sanses...by im going to cough on you
You kind of zoned out for a bit, trying to piece together what they said, when the door opened suddenly. You let out a small shriek as your head slipped and you hit the...
The One Thing That They Care About (Sans AU x Reader x Papyrus AU) by voltimer
#10
The One Thing That They Care About...by 𝐜𝐡𝐫𝐨𝐧𝐨𝐬, 𝐭. 𝐯.
Y/n L/n. A special human with a special SOUL. Yes, her Soul Trait is something new. But other than her SOUL trait she has another secret. One day, while she was at the...
Completed
Karmatic Trio (Bad time trio x BNHA)  by DontAskImN0body
#11
Karmatic Trio (Bad time trio x BNH...by ImN0body
This story takes place after the player vanishes from their fight with the bad time trio aka Sans, Shift, Stretch. The three got stuck there for a very long time until a...
The Story of a Reaper [COMPLETE ✔] by tRaSh_4U
#12
The Story of a Reaper [COMPLETE ✔]by Undertale_tRaSh_4U
When made by his father, the god of death, he didn't know his purpose. All he could do was kill things on accident...he didn't mean to kill them, he just wanted a friend...
Naturetale : reborn as lavender  by KarmaAkabane425
#13
Naturetale : reborn as lavender by Karma Akabane
(As far as I know, no one has made a story about naturetale like this so..and the only reason why I writing one like this is because of fatal error part 5? Or part 4, go...
Truyện tranh Undertale (Vietsub) by -Ruby-Chan-
#14
Truyện tranh Undertale (Vietsub)by ♡ 26 ❤ 12 ♡
Tiếp tục bên nick @nhi26122004 nhé <3
Criminal Conflict (An Undertale sanscest story) by __Purple_Fluffball__
#15
Criminal Conflict (An Undertale sa...by Crossmare
This is an Undertale book Criminals have always littered the streets causing a mess and breaking the law. But what happens when criminals Fall in Love? This includes all...
Completed
Feelings Are Overrated ~Killer X Nightmare~ by OreoCookie1129
#16
Feelings Are Overrated ~Killer X N...by OreoCookie
In order to be seen as not soft Nightmare buries his feelings down deeper than his soul. What will happen when those feelings start to rise to the surface. Will there be...
Completed
Six Skeletons, One Maid by RaccoonSinQueen
#17
Six Skeletons, One Maidby RaccoonSinQueen
Moved from AO3 because of reasons! "You are the only maid (or worker in general) that serves for the Skeletal Household. It's a skele-ton of work, but you manage by...
Hero Time Trio (Bad Time Trio X BNHA) (On Hold until I could think of an ending) by ShadowChaser936
#18
Hero Time Trio (Bad Time Trio X BN...by Shadowchaser of Unitrex
Bad Time Trio meets BNHA Disclaimer: I do not own BNHA, Or Undertale, or any of the AU or any of the pictures showed
A Skeleton's Hope (Undertale AU's x Reader) DISCONTINUED/BEING REWRITTEN by Just_Vibing_Man
#19
A Skeleton's Hope (Undertale AU's...by Dead
Sans and Papyrus were your best friends until randomly they just cut off all contact with you. This went for everyone else in your life so it didn't really hurt that muc...
The Trio of Remnant Chapter 1: Hatred (Male Sans Reader X Blake Belladonna) by Icetome
#20
The Trio of Remnant Chapter 1: Hat...by Icetome
This is my first story and it will be about RWBY and the bad time trio, I do hope you enjoy this story and criticism is welcome ( I do not own Undertale, or RWBY, all ri...