One Last Time - (Sans X Reader)

CHAPTER_17

"Y O U R   F A U L T"

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[Your P.O.V]

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Its been awhile since you have been back with sans and the others. After like four days or so, in these four days you lived with alphys. You both watch anime together, do experiments together, or even study about science. And in these four days sans would always visit you, just to make sure you were fine. You didn't really mind though, but you sure was slightly annoyed with his presence, especially when he's with frisk. 

You slowly flutter your eyes open. And another day unfolds. You sleep on the couch in the living room cause alphys only had one room. You take a bath and cooked breakfast, which was bacon and some eggs. As soon as you were finished alphys come down and heads towards the kitchen where you were at. "G-gee you sure c-cook good Y/N!!" Alphys says while rubbing her sleepy eyes. You smile genuinely as you say "thanks Alph, you always say that, if you want I can teach you?" She then squeaks happily as she hugs you tightly "I would l-love that!" You both then sits down and started eating your meal. You admit it was kinda delicious. It was quiet as you eat, not until alphys breaks the silence. "H-hey, I've been conducting a-an experiment, w-want to be my s-subject?" You think for awhile before you answer. "Sure why not!" She squeaks again and soon dragged you up to her lab while you stumbled here and there on your way. She makes you sit on a stool and gets a syringe while you waited. She first shakes the syringe up and down then goes near you.

"W-whats that?" You asked with a slight fear on your voice. "I actually d-don't know, once I inject you, I w-would have to s-study and observe your b-behaviour to determine w-what it t-truly is" you gulp as you stare at the red liquid inside it, the liquid had a faint glow and somehow looked like blood. But you shrugged it off anyways. Alphys then proceeds on gently grabbing your arm and wipes it with alcohol. That's then she injects the syringe into your skin. It was a sick tingling feeling, it first stung in pain but soon soothed out. After awhile nothing happens, you were perfectly fine. Well that's what you thought. "A-are you ok, do y-you feel a-anything weird?" You just shake your head side ways as you stand up and walked out the lab with alphys by you side. "Hey why don't we call Undyne, so we three can watch anime" alphys nods her head and calls Undyne right away, she heads to the kitchen while you sit on the couch thinking, what would happen to you, what was in that syringe?

All of a sudden a massive amount of pain finds its ways to your brain, giving you a headache. You tried to massage your temples, but it only worsened. Alphys comes back in the room, once she sees you she rushes back in the kitchen and grabbed a glass of water for you, you first hesitated but drank it anyways. "A-are you alright, I c-called Undyne, she's g-going to be here in a m-minute" you slowly nod you head while you stare at the ceiling. "I'm f-fine" you say calmly as you close your eyes. "A-are you sure?" You nod your head up and down and finally opened your now blurry eyes. You look at alphys and everything turns black "a-alphys where are you? I-I can't see anything!" You say in a panic way. "I-I'm here Y/N!!!" You hear her voice echoing throughout the space, but only darkness surrounds you. You started panicking shaking your head side to side. You look around once more and the room was back. "I-is everything a-alright now?" She asks. You look at alphys worried face, and slowly her face turns to your stepmother and father, then back to alphys. Anger build up on you as memories of the past comes back. Alphys face keeps flickering back to your stepparents then back to alphys again. "You!!" You say loudly startling alphys, you come closer with angry eyes as alphys stumbles backwards. "Y-Y/N, what a-are you doing!!"

Your eyes flicker from your E/C pupils, then to red gleaming ones. "You MURDERER!!!" you then proceeded on choking alphys which was frightened by your choice of actions. "Y-Y/N, please s-s-stop!! She manages to cough out some words but your grip only tightens. Soon the the door opens revealing Undyne, "what the hell, Y/N, ALPHYS!!" she shouts as she throws spears at you. You stopped choking alphys and grabbed each spare Undyne has thrown to you, and you threw them back to her. Alphys scrambles behind Undyne for protection, while you laugh maniacally, your once innocent looked like a murderous one. "Call sans, Alphys!" With that Undyne proceeds on tackling you while you just stood there smiling creepily at them. Just when Undyne grabs a hold of you, you take her hand and throw her down the floor. Unbelievable strength, alphys eyes widens and jerks closer to the now injured Undyne. "Why are you d-doing this Y-Y/N?" You smile in response "its just called sweet revenge!" You spit out to them. Just when you were about to stab them with a knife nearby sans teleports in front of them.

"What's wrong with you Y/N!?" he asks summoning bones around you. You smile again, and collapse down the cold ground. Your vision becomes blurry, and soon you drifted off to the surrounding darkness. What happened, why did you do such thing to a friend? You once innocent, turns to a murderer in a matter of second. But why? How? Soon you were walking around the dark, your footsteps echoing throughout. "Hello?" You speak glumly, fear evident in your tone. "WhY Y/N, DId yOu hAVw fUN?" Chara.... You immediately turn around, and there she was, standing with her devilish smile on as usual.

"Well Chara, if it isn't you, hmm let me think, for your information, I did have fun, not until you came!" She grins wider, entertained with your presence "oUcH, thAT hUrTs!" She says acting like her heart ached from the words that you speak. "what did you do this time!!" You hiss at her while she comes near. "ANd noW iTs My faUlT! I DiDnT dO aNyThINg, it wAs yOUr chOiCE nOt mINe!!" You grew confused but shouted anyways "you possessed me! You made me hurt my friends!! You used me!" She just laughs in response, which crept you out. "poSsEsSeD yOU? HahaHAhA, yOU WiSh! ThAt nEvEr haPPeNed, atlEAst jUSt yet!" You grew even more confused. You growled annoyed, what did she mean, didn't she possess you? Wasn't she the one responsible for all the hurting?

That's when it hit you. It wasn't chara, but, you yourself. You were triggered by your past memories, you grew mad, and seek revenge. You thought alphys was your stepfather. It was you all along. You face drops as you stumble backwards "GuILty aS ChArGEd! haHaHahA, neXt tiME, dOnT gO BlAme PeOpLe!"  You stumbled backwards, it was all your fault alphys was hurt, your fault Undyne got injured, your fault your friends got hurt. You then violently shake your head sideways, the guilt was too strong. "ItS yOUr fAuLT!!!"

Your fault

Your fault

Your fault

The words echo through your mind as the guilt in you grew larger. "No, no, it isn't my fault! NO!"

.....

You shot up from a bed. You look around the room in a panic way. It was alphys medical room for sure, but why did she help you? Your grip on the blanket tightens as the same words chara said repeats in your mind.

Your fault

Your fault

Your FAULT!

Her voice grew louder and louder by the second. You felt guilty, very guilty. The words 'fault' appears in front of you, them it duplicates making you even more guilty. In a sudden click, all of the words were gone, but Chara. "soON EvEry mOnSTer iN thE unDeRgrOUnd wIlL DIE! AnD itS goInG to bE yOuR fAUlT!!" She then laughs evilly and soon faded out in the darkness leaving you look like you were in a mental state. You violently hold your hair and shake your head multiple times. You repeat the words yourself as sans and alphys comes in the room to check. "My fault, my fault, my fault, its all my fault!" Sans had a worried look as alphys face showed fear on how you were acting. "Ya alright kiddo?" Sans asks calmly.

"It'd my fault, my fault, everyone DIES!!!"