Undertale AU Sans x Reader Oneshots

Child! Geno x Ghost! Child! Reader

(Y/N) POV
I sit on a tree near my bedroom where I used to share with my younger brother/sister. I have been dead for 4 years. I know how I died but I had to stay in the human world. I never went to the so called 'afterlife'. I'm the only ghost here that is this young. I died at the age of 9 years old. My younger brother/sister is now 10. I watch as my brother/sister goes through a book. I go through the brick wall and see (Y/S/N) (younger sibling name) going through all the pictures that had me in it.

They start to cry. "I miss you (Y/N)." They hold the book tightly against there chest. I make a sad face and near (Y/S/N). No one can see me but I always give little hints to my family that I am still here. None of them caught the hints yet. I float near them. "I miss you too (Y/S/N)." I touch their shoulder...or tried to. They look up and look at me. "Is someone here?" She/he stands up and goes right through me. I look down in the ground. "Odd I thought I heard someone and felt someone." They wipe away their tears and leave the room. I float through the wall and I am now outside. I 'sit' on the tree I was sitting on before. I stare at the people below. I then see a small skeleton child that had a red scarf that was very noticeable. (Ok to make it clear Geno and Papyrus never died. They just have pixlilated eyes well one pixlilated eyes. Gaster is also alive).

Well two small skeletons and one tall one. All three of them look at me and wave. I furrow my eyebrows. No one has ever seen me except for babies and animals. Then they have worried looks. They then leave. "How can they see me?" I float down towards them. I follow behind them. "Papa do you think they are alright?" A really short one said with a cute voice. The tall skeleton which I believe is there father looks down. "I don't know Papyrus. They might be." Then he looks back and sees me. He widens his eyes.

I blink while staring at him. I float up to his face. "Can you see me?" I ask him. He looks shocked. He nods. Now it was my turn to widen my eyes. I float back a bit. "You shouldn't talk to me out in the open. People will think you are crazy." I disappear. I am now behind the short but tall skeleton. He had a glitched up eye socket, had a red scarf, white sweatshirt, black pants, and black shoes. "Where did they go papa?" I disappear and end up back on the tree. I see them all looking for me. They soon give up and walk away.

Geno's POV
They looked the same age as me. "Can you see me?" They said. They had blood coming out of their mouth, a faint t-shirt with (F/C) and (2/F/C) stripes on it which had a lot of blood on the stomach area. They also had (F/C) shorts and they legs looked faded like they weren't even there. They had blood on their arms and part of their legs as well. Their hair had a light (H/C) color. It also floated around like there was no gravity. Same does for their clothes. They looked rather clear like you can see right through them. Wonder what happened to them. My dad nods. The floating kid widen their eyes and backed away.

"You shouldn't talk to me out in the open. People will think you are crazy." They disappeared. Are they a monster like us that just looks human. I look side to side. "Where did they go papa?" Papyrus asks. Dad looks down at him. "I don't know." We look around for the kid. They seemed to not be around here. Dad gives up and we move on to visit Error and Fresh. Dad and Papyrus finally know about the alternate versions of us. We were going to visit them since my dad is great friends with their dad or the alternate version of him.

We made it their house. I ran inside and found Error and Fresh on the couch watching TV. My dad left since Papyrus doesn't really want to be around my friends. "Hey Geno." Error said without his normal glitchy voice. "Wiggdy wiggdy wuz up my rad bro?" Fresh said with his 90s language. I smile and roll my eyes. They aren't really brothers but they are known as the freaks of the multiverse so they decided to call each other brothers.

"Guys I just saw the weirdest thing today." I sit next Error. "Woah woah calm down dude. Tell us what you saw." Error says as if I just saw someone die. I roll my 'eyes'. "I saw a kid our age that was clear and and had blood on their clothes yet them seem to be alright. They were also floating in mid air." I said making it sound exciting. I see Fresh's shades now said 'wow'. Error raised a brow. "That is odd. So they were like 9?" Error asked to see if I was lying. I nod my skull. He widens his eye sockets.