[°Undertale AU's x Reader°] |•one shots•|slow updates!]

ff sans x sibling!monster!reader

IM FINALLY HALF FAMOUS (jk I'm not😭)
I was looking at YouTube cause I was bored like rlly bored and I was like "let's check the one I posted" I did and I didn't notice about the 1.1k view and left but I noticed it a bit and went back to see if I'm not dreaming or imagining AND THERE IT GOES :DD
(Anyways yes this note is useless I just want to share it lol)
Edit:
IT BLEW MORE 😭😭

Flower fell sans x sibling! monster! Reader

Anyways continue to the story xD
(F/n) > (freind name)
(Gore warning?) =^

Ok ok I had a idea while making milk for myself so yeah now read 🌚🌝
(Pronounce will be her/she)...(pun intended)

(Y/n is a human at the moment)

Y/n pov:
I have alot of determination to releasing the monsters underground to the surface but of course sans tried to stop me and decided to take me as a sibling but of course as dumb ad the other y/n's are there I continued to save the monsters one by one, sans was worried but neither way let me save them and that means everyone even the "queen" undyne.

I save Everytime I see a save point, and Everytime I die I will have a flower in my body it can be anywhere In the end it was worth it I saved the monsters and they left the underground thanking me like I was a god or sum
Sans was proud of me even though I'm half blind

(This is what you look like)

(Now now I tried my best again (no it took me 3 minutes) totally...🧍‍♀️Also ew look at the hand)
You can change the skin color and hair color of course
If your wandering for the bottom part it's brown shorts and (favorite color) shoe)

Also your at the brothers home staying ok 👍

Now to the story AGAIN.

The monsters were kind to me now and I tamed papyrus and undyne I'm proud of my work and wouldn't reset anymore it not like I have done a genocide anyway and if your wondering about the humans of course humans are Mean to me for having a monster family and saving them from underground,the save point stopped at the brothers new house near my room, and I saved cause you may never know

"Heya sis" the voice made me kinda jump but I know who belonged to

"Heyo sans! What's up?" I delivered back
"Ceiling hehe"
"Wow so funny" yeah it was funny not for the author tho she thinks it was cringe while texting that but still funny to her perspective 
"I know anyways wanna come with me to the market, we are running out of food" sans asked I then agreed and got ready sans said he will be waiting outside and I yelled an ok
After that we walked to the market it was kinda far but either was fun

We reached the market and there's no monster there..weird??
And near the market there's a dark alley
"Sans I will be waiting here can I?" I asked
"Sure sis be careful tho you know humans tend to be very hungry for sugars" sans said and hugged me he then left to get groceries and I leaned in the alley then suddenly someone took me and draged me to the dark alley and the void started to take over me and I fainted

(!!Gore warning is here if you feel uncomfortable with the gore please skip the gore!!)

Sans pov:
(WOW SO UNEXPECTED :000)

After a few minutes I left the Market and saw... No one WHERE'S Y/N? I rushed in the alley way and saw dark alley like a void but I can see someone dragging something i followed the figure and just saw a monster killed the monster then died and dust Flew
My 'eyes' turned black when I saw something more disturbing then that
At the end of the alley I saw y/n's dead body, stabbed,bloody,and heart scraped away like it was nothing a bad way to say it is there's a hole in her chest bloody,soul shattered in the floor, and the floor being so damn red because of y/n's blood, her hair is cut off ,and well.. she was stabbed from head to toe, I Shaked with the sight and cried...she's gone...WAIT THE SAVE POINT SHE MIGHT BE BACK AT HOME..

(!!gore warning is gone!!)

I rushed my way home with my groceries and kicked the door open to see papyrus...only papyrus he seen me and suddenly asked me

"SANS. WHERE IS Y/N. WHERE. IS. MY. SISTER."
I again Shaked and cried with the thought of y/n getting killed brutally
"S-SANS? WHY ARE YOU CRYING AND SHAKING SO BADLY?"
.
.
.
.
.
"SANS?"
.
.
.
.
.
.
.
"s-sans please tell me why are you crying??"
.
.
*Silence filled me with fear*
.
"She's dead"

"WHO'S DEAD?!"

"y/n"

...

"Heyyyyyy so like I'm dead but I'm a ghost so I'm technically half dead-"
I jumped
"Y/N!" I jumped to hug Her but failed
"Oops uh I wish I could help you up but I'm a ghost"
"It's ok. Who killed you tho!?"
"Uh...."

*Flash back*
"Y/n are you sure about this?" (F/n) Said
"Yeah I'm positive sure! Also this will make me immortal!" I smiled
"DONT TELL THEM THEN I WILL DEFINITELY DIE IF YOU DID!"
"yeah yeah~" I playfully said
"Your lucky I'm part of my father's mafia group I wouldn't be disturbed as much"
"Don't worry I'm still friends with you even tho I'm a ghost"
"Thanks y/n- WAIT WHY ARE WE DOING THIS ANYWAY?"
"uhh I just want to Protect sans, papyrus and the other monsters better!"
"Hmm yeah sure, I'm still going to be a bit disturbed since your my friend"
"Yup I'm ready!"
*Flashback end*

Y/n's pov:
"Well uh no one really"

"What do you mean? You were killed brutally!"

"Ehem. Explain. Now." Papyrus interrupts
I sweat dropped

"Listen...ijustwanttoprotectyouguysbettercauseimreallyweakandbecauseofmyhumansoulicantprotectyouguys"

(I just want to protect you guys better cause I'm really weak and because of my human soul I can't protect you guys)

Papyrus understands me quickly but sans seems to be confused and lost

"SISTER WE DONT NEED PROTECTION ALSO YOUR NOT WEAK YOU JUST SHOW YOUR STRENGTH WITH NO VIOLENCE BUT MERCY!"

"I gotta agree your strong by showing mercy also your soul doesn't mean anything,and you release us from the underground which is impressive actually"

"Heh thx" I scratched the back of my neck

"Well I'm going to sleep cya tomorrow bro,y/n" sans said heading upstairs to his room

"Well I guess we deserve sleep it's almost nighttime anyways.. good night sis!" papyrus said also Heading upstairs 

"Good night brothers!"I slightly yelled And headed to my room

I still have my (s/t) and my head is hurting I just ignored the pain and slept
(Soul trait)

*Next morning*
I feel weird wtf...I don't feel like a free perso- ghost

I sit up and looked at myself in the mirror and...

"WHA? WHAT THE HECK?!" I whisper yelled

"I TURNED INTO A HALF HUMAN HALF (f/a) (favorite animal)" I again whisper yelled

"I mean it's not half bad but man-" my door flew open
"HUMAN SISTER ITS TIME FOR BREAKfaaast- What the f-ck happened to you?" Papyrus said

"I don't know but it seems cool"
"AH YES YOUR VERY V-"
"-berry cool hehe" sans suddenly appeared next to papyrus
"SANS NOT WITH THE PUNS IN THE F-CKING MORNING!!" he yelled and stomped downstairs to prepare foods
"Oops that made him 'berry' mad 'butter' get goin" he winked and ran down too

This is a good life even tho I'm half monster now

Chérry/author: can't find the perfect thing to do for the blue x child reader so please be patient :')

(Last updated 02/02/2022)