This Was Inspired By The Video. This Is Genocide Route Of Course. This Is After Frisk Has Fallen Into The Underground And Is Currently Meeting Mettaton For The First Time.

{Sans' pov}

i knocked on the door

"knock knock" i said

"Who's There" the old lady said but she seemed sad with a touch of fear.

"why" i said

"Why Who" she said

"why you so sad" i asked

"Sans Two...people Fell Into The Underground" she said

"two humans.....huh" i said

"No Their Not Human. They're Two Girls Who Call Themselves Gems A Red And Blue One. The Red One Calls Herself Ruby The Blue One Sapphire" she said

"like the rocks?" i asked

"Yes" she said "But Every Time Ruby And Sapphire Are Attacked Ruby Kills The Monster"

my pupils grew larger

"Listen Sans" she said "The Promise You Made For The Human Child I Don't Ask You To Keep It With These Two Just Protect Frisk With Your Life."

"yeah of course" i said "i really like the kid they tickle my funny 'bone"

"Hah Hah..... Sans I May Not Live Through This If I Try To Stop Them" she said

"yeah i know" i said

--------------time skip brought to you by sans' puns----------------

i teleported behind the two and followed them then teleported away when they looked back. when they got to my bro's gate they stopped. i teleported behind them and listened

"Alright sapphire your future vision got us this far" the red one ruby? said

"All i really see is nothing bad happening when we walk through" the blue one sapphire i guess said

i walked right behind them

"hey.....don't you know how to greet a new friend... turn around and shake me by the hand" i said holding out my hand they seemed scared but the sapphire turned around and held out her hand.

i shook it and noticed an actual sapphire in it

"hey i'm sans. sans the skeleton" i said

"Hello i'm sapphire and this is ruby" she said

ruby looked ready to fight

"hey... what's future vision. because i know your not human and that makes me curious"

"I can see into the future all possible paths that can be taken." Sapphire said "But you were not in them.... how"

"i don't know" i said "but hey listen i can help you out a skele-ton"

------------time skip brought to you by Mtt brand tv remotes------------

i failed.... as much as i tried those two killed everyone and somehow fused together i wont last long. but maybe if i can survive long enough i can kill them. 

"Sans Wait" The Kid Shouted

"kiddo listen i have to fight i'm the only one left" i said turning around

"But Sans You'll Die" they said

"kid if i die i give you permission to reset." i said "and besides that future vision wont work on me." 

"Why" they asked

"i don't know for sure but i guess it has something to do with the resets" i said shrugging

"Sans Please Don't Do This" they said starting to cry

i hugged the kid and they hugged me back

"she killed papyrus...." i said

"Yeah I Just Don't Want To Lose Everyone" they said

"kid go to asgore tell him what happened" i said

they nodded and ran down the hall. i noticed the new fusion garnet? i think walking down the hall. when she stopped in front of me she looked down

"Hello sans" she said

"heya" i said "you've been busy huh"

"What do you me-" she started to ask before i cut her off

"so i've got a question for ya" i said remembering i said this exact speech to chara "do you think even the worst person can change...? that everyone can be good if they just tried"

she looked down 

"heh heh heh heh..." i laughed "all right. well here's a better question."

she looked at me

"do you wanna have a bad time" i said my pupils disappearing "cause if you take another  step forward... you are really not going to like what happens next."

she got into a fighting stance

"welp sorry kid. this is why i never make promises" i said 

she stopped seeing i wasn't doing anything and i looked at her

"it's a beautiful day outside.... birds are singing...... flowers are blooming....... on days like these creatures like you..............." i said and my eyes went dark "should be burning in hell"

my left eye turned blue and i made her soul blue then threw her against the wall. she jumped forward barley avoiding the bones then i sent out a large wave of bones. she jumped into the bone wave twisting her body to cope with it. she landed in front of me and i summoned my gaster blasters. she was hit by two of the lasers and dodged the last two. 

"heh i always wondered why people never used their strongest attack first" i said and garnet attacked i dodged until she stopped attacking

"SANS WAIT!!" asgore shouted

i stopped and looked at him garnet stopped two. asgore suddenly pulled out his trident and threw it at garnet. she ducked but it knocked off her sunglasses

"asgore she can see into the future!" i shouted

he looked at garnet and i turned around she stood up and i realized she had three eyes

"SANS GRAB HER TWO SOULS" the kid shouted

"why" i asked

"SHE'S A FUSION REMEMBER" they shouted

i realized what they meant and turned grabbing their souls separately and pulled them apart. with a flash of light both girls fell to the floor 

"so now that you can't fight as well why...." i asked 

"What do you mean" Ruby Asked

"why would you kill us all." i asked

ruby didn't answer but punched me in the face my skull cracked and my 1 hp became 0..

"SANS NO" the kid shouted

"k-kid r-reset for me okay bring them back. or if you can't reset give flowey the 6 souls to beat her." i said falling to the ground. the last thing i saw was ruby attacking the kid and the kid pressing the reset button.

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"sAnS...." a voice spoke "sAnS WaKe uP......"

i opened my eyes and looked around i was in a black room

"SaNs yOuR AwAkE!" a figure said looking over me

"w-who are you" i said my eyes adjusting to the darkness

i looked at the figure and he was a skeleton like me and paps. i looked at his face and there were two cracks in his skull one above his right eye and one bellow his left. i realized who he was and hugged him

"dad!!!" i said

"hElLo sAnS" he said sort of hugging me back 

"d-dad i thought you died" i said crying

"n-nO I WaS JuSt lOsT HeRe iN ThE VoId. I CoUlDn't cOmE BaCk i'm tRaPpEd hErE" he said

"i'll find some way to get you back dad" i said

"tHaNk yOu sAnS..... lOoKs lIkE OuR TiMe iS Up i wIsH We cOuLd tAlK LoNgEr bUt sHoRtLy tHe rEsEt wIlL FiNiSh" he said and the world was fading to white "gOoDbYe sAnS"

the world formed in around me and i looked  around i was in snowdin forest.

"SANS" the kid shouted running up to me 

"kid!" i said "what happened when you reset because of chara i was in my house" 

"I Just Loaded A Save From Before Those Two Fell Into The Underground" they said

"how did they even fall in anyway" i asked

"I Don't Know" the kid said

"come on kid you have to meet mettaton" i said

"Yeah I Know" they said and i teleported us to hotland  

A/N: And That's That. Yeah I Know It Was Dumb But It Was Supposed To Be Random This Is Called Random Stories After All. Also It Seems Sans Was Caught Between A Rock And  A Hard Place.