Error X Reader {The Stars Are Nice Outside, Right?}

An Unexpected Meeting

[Warning, in the dream, some slightly gruesome stuff happens. Skip if you don't want to read it. And the story deals with gruesome/sensitive topics occasionally, so you don't like, you don't read. You may now continue if you wish.]
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Run.. Running was all I could do.. I wasn't going to let whatever is behind me get me! I feel it's eyes glaring at me as I ran, as it let out a dark chuckle. I was scared, to say the least.
"Come back to me, good old Nightmare wants to hurt you some more~" it purred, making me almost vomit. The disgusting thing has tortured me as the price for getting my vision back. Every. Single. Night. I feel the tears fall down my face as it lets out another crazed chuckle. I race towards a corner, swiftly passing it, and seeing light at the end of the dark corridors. My eyes light up. "Freedom!" I thought. As I was about to race through, the thing grabbed me by the ankle with its slimy tentacles. I was in such a panic, I didn't have enough time to balance myself, therefore falling right in front of the light.
"No! NonononoNO!" I screamed. I desperately reached for the light, as if it was a life or death situation, which it could have been. It gave a low giggle, seemingly amused by the fact I was so desperate.
"Did you really think you could outrun me? Especially in my own land." It gave an insane smile, before he shot a tentacle right through my left eye. The scream I let out could've been heard from miles, as the blood poured out of my eye socket, where my eye had previously been. He held an e/c eyeball in front of me, waving it in my face as if he was trying to taunt me. I gasped for air, holding where my eye had previously been. I shot a frightened look at him when he threw the eye away somewhere.
"You have to go, but I'll be sure to back next time!" It shouted in a childish voice. I soon feel the ground- no, everything around me vanish.
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I shoot up from a soft, fluffy surface. I feel the tears pouring down, as I try to regain my breath. After a while, my loud sobs where reduced to small sniffles. I let out a long sigh, as I replaced my hand onto where my left eye was. Lucily, I could feel the place that was previously a hole. I hear a door open, but instead of turning the lights on like my mom would've, they just walked through, and closed the door with an almost silent Creek. I grab my blanket, and hugged it tightly. By now either one of my parents would've said that it was just them. I wipe my tears, and try to look as confident as possible while listening intensely for any kind of sound. Suddenly, with no explanation, slow, but soft footsteps head my way. From behind. I whip my head back, scared. It wasn't doing anything, just standing there. After a while of blankly starring at what I assume was the intruder, I could feel it waving something in front of my face. I give them an annoyed face.
"Are you not scared of me?" It asked, but it was no normal voice. Oh no, it was far from that.. He spoke in a deep voice, occasionally changing pitches, or quickly stuttering. It wasn't human. It wasn't safe. My face paled, as I felt it glare at me, probably wanting an answer.
"I- I'm blind, I c- can't see a- anything..." I stutter, afraid of what it might do. The enraged aura fromthe things vanished, and was replaced with a calming one. A one my parents usually had.
"Oh, so that's why you didn't react to my waving your mom's head in front of your face." My eyes widened in shock.
"No.. You didn't..." I gasp, tears threatening to fall once again.
"I did." It said, seemingly proud of itself. "I also have your twin siblings Chara and Frisk's heads." That's when I couldn't take it. I think I accidentally grabbed his sweater instead of my blanket, and sobbed into it. My cries filling the room and echoing out as the sounds bounced from the walls. For he had not only killed my parents, which was bad enough, he had also killed two infants. Two infants, who had a bright future ahead of them, and a happy life. That was all shattered, by some sadistic murder. I felt it tense up, and I realized it was not my blanket, which made my cry even more from fear. But instead of feeling some sort of weapon smash into me, I am greeted by a sound, as if a computer had crashed. When I looked in front of me, in the darkness. I saw a error message.
"Error.exe has stopped working, would you like to reboot?" I read aloud. Two options where in front of me. A simple "yes," and a simple "no." Foolishly, I choose yes. I waited for a while, noticing my cries where reduced again. I wipe my tear stained face, and sit up, waiting for him to respond or reboot.

It's been a while now, when I finally heard him groan.
"Don't ever touch me." He growled. I sniffle a bit, and nod. I'm not crying for the third time today. I felt something faze through my chest, and what felt like wires uncomfortably wrapped around me. I get it now. He gives me a nightmare to shake me up, kills my entire family, the only ones who care about me, and to kidnap me. "What a lovely time to be alive!" I think sarcastically. Soon, for a split second, I feel the floor underneath me dissappear. I hold my breath in fear, until I'm dropped onto a cold ground, wires still attached to me.
"Welcome to the void." He says. "This is where you'll be staying, puppet." I resist the urge to gag as soon as he said "puppet." All I get back is an amused chuckle. As he leans closer to my ear, I shrink, and my face paled. "With me."