Underfell Stories

1.2K Stories

Not Just Evil (Underfell Papyrus X Reader) by TheIndianaCrew
#1
Not Just Evil (Underfell Papyrus X...by Indiana
Underfell Papyrus is viewed as one of the most ruthless monsters in the underground but what is really under that tough persona? Thanks to Tamqul on Deviantart for letti...
Completed
(Underfell sans x reader (female)) UNDERCOVER by moon1767
#2
(Underfell sans x reader (female))...by Arie
You're a human that has fallen into Mt. Ebott on the year where all humans dress as monsters...Halloween. So how will the monsters know if you're a human or not?
Completed
My Little Puppy (Fell!Sans x Wolf!Reader) by Time_Shadow
#3
My Little Puppy (Fell!Sans x Wolf...by Time Shadow
(Y/N) is a human. She had lived her whole life as Sans and Papyrus's pet, which was even more appropriate considering that Alphys had done a few experiments on her givin...
Heavy body.  by -_CAPTAIN_SMEXY_-
#4
Heavy body. by -_CAPTAIN_SMEXY_-
Unacceptable love. Within the world of broken homes and shattered souls. There was no love.. - Cover art isn't mine!
Can I take you to Dinner? Mafi-fell!Sans x Reader.  [COMPLETED] by MissHoll-E-Socks
#5
Can I take you to Dinner? Mafi-fel...by MissHoll-E-Socks
"How rude, not even gonna ask for a name??" He teased. "Why are you here?" You glowered, raising the whisk. The skeleton scoffed: "Well, glad yo...
Completed
Furtastic by Lunawolf34
#6
Furtasticby J. E. Collins
A girl who has never seen the world outside of the lab sees it for the first time only to fall down into the underground. What will she find down there?
UnderTale Oneshots (FINISHED) by TheGrinningKitten
#7
UnderTale Oneshots (FINISHED)by TheGrinningKitten
(I DO NOT WRITE ABOUT UNDERTALE ANYMORE SO PLEASE DON'T REQUEST ON MY CHAPTERS) (AND FOR THE LOVE OF GOD STOP COMMENTING ABOUT MY GRAMMAR, I AM SWEDISH AND I HAD A HARD...
Completed
Sans And Papyrus' Pet~  ~Completed~ by GalaxyTheFur
#8
Sans And Papyrus' Pet~ ~Completed~by Edgy_Bean
‼️⚠️WARNING: MATURE THEMES SUCH AS SEXUAL ACTIVITY AND TW'S PLEASE READ AT YOUR OWN RISK⚠️‼️
You and your Bitty Pals by Blueprint15778
#9
You and your Bitty Palsby Blueprint15778
It has been 5 years since monster broke free from the barrier, since then monsters, and humans live together in peace. But for some reason monsters have some how go a mi...
UnderFell: Brothers Don't Always Get Along by Adventurous_Cuphead
#10
UnderFell: Brothers Don't Always G...by Angel
The underfell brothers, sans and papyus, are living together, but will the abuse from UF! Papyrus be too much for sans to handle? What will happen to sans? Read for more...
My Two Masters (UF!Papyrus x Skeleton!Reader) by OreoDaSkeleton
#11
My Two Masters (UF!Papyrus x Skele...by Fluff TwT
Y/N's been traded and sold her entire life. She's learned firsthand that if you don't obey your master, you get hurt. If you force yourself to listen, you live another d...
"I'll Help You" Honeymustard Fanfiction by aufictions
#12
"I'll Help You" Honeymustard Fanfi...by aufictions
• discontinued • One day an abused skeleton appears out of nowhere. He looked like he needed help... He looked like he needed...love...caring.... The tall skeleton notic...
See you soon (lemon) by ItsSwapPapyrus
#13
See you soon (lemon)by Teutonic
NSFW 'side' chapters of 6S&TW - 4/6 completed . The guys' heat cycle is happening + with a little bit of spice !
Underfell Sans X Frisk by Hazefrost
#14
Underfell Sans X Friskby Hazefrost
When Frisk falls into the Underground, she is horrified to discover the world of monsters is every bit as evil and broken as she had been told her entire life. But when...
Reborn as fellswap san and now I'm kinda blind!? by KarmaAkabane425
#15
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...
Hidden for so Long (Sans AU x Reader) {Remake} by RandomWriter-Chan
#16
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...
"just to see you smile" ( AU sans x emotionless reader) by newttheyandere287
#17
"just to see you smile" ( AU sans...by bbgirl.eats.shickennuggets
(y/n) is a maid for a huge mansion living in the servant's courters. Through her past of pain, and trauma has caused her to lose her willingness for emotion only able to...
Wilted [ Sans x Flowerfell! Reader ] by morrow-
#18
Wilted [ Sans x Flowerfell! Reader...by space sloth
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...
Completed
A Knocking at the Door by thatonefangirltho
#19
A Knocking at the Doorby ThatOneFangirlTho
(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 o...
Bitty Bones (My Little Babies) DISCONTINUED (Creating a New Book Soon) by Delta_Nickle
#20
Bitty Bones (My Little Babies) DIS...by Delta Nickle
this is a story about a girl who finds little bitties who were abandoned and takes them in little does she know that its harder than she thought and that the bittys won'...
Completed