[Sans POV]

I walk towards the Ruins door its never been opened when I was around but I came there every day to talk to the girl that was on the other side of the wall. You too had both been talking for a long time and she made you promise her that you help a human that made it through the door. There was only one human who has successfully left the underground and it haunts your soul. But as you walk to the door and start up your knock knock jokes you get the surprise of your life time.

"Knock Knock" you start off

"Who's there?" a female voice answered. 

For the first few seconds I thought that it was just my friend but then soon realize it was someone else. Not to be rude I continue my joke.

"Needle." I reply 

"Needle who?" she continues.

"Needle little money for the movies." I laugh at my  joke you made on the spot. I hear the girl laugh its a sweet quiet laugh different from your friends. I smile. 

The girl replies with a different joke.

"Knock Knock."

"Who's there?

"Robin" she replies sounding a little shy.

"Robin who?"

"Robin the piggy bank again." she chuckles a little bit. There's something about that laugh that I've heard it somewhere you just can't find out where. I snort trying not to laugh. I then realize something. Wheres your friend? You decide to ask her a question.

"Who are you?" I made it much more scary than I wanted it too but I couldn't help it.

"Well I'm Y/N and I fell down here about a day ago" she replies with a little tone of worry in her voice.

"She must be a human" I grew a little worried about it.

"Well Y/N better be going I need to watch my post." I pretend to walk off and then sit down and listen to Y/N.

[Y/N POV]

*sigh* You rub your arm it hurts from the cut 

"My arm hurts still it will be a while for it to heal." you smile faintly and start to cry. Tears roll down your face and you talk to yourself.

"I don't know what had gotten into my brother... i just didn't see it coming." you sob uncontrollably as you stare at your shoes. 

"Why am I here is anyone going to save me?" you continue to cry to yourself. Until you hear foot steps coming downstairs.

"Y/N? You down here?" Toriel calls to you.

"Y-Yes" you reply weakly still crying. She sees you at the end of the hallway and walks up to you.

"Oh its okay my child theirs no need to cry" she says quickly trying to calm my tears. Causing me to cry more. Toriel grabs my hand.

"Come lets got upstairs and have some pie my child." she lightly tugs on my hand.

"O-Ok" you reply standing up and walking down the hallway with her.

[Sans POV]

She sighs heavily. I wondered why but I wouldn't ask I'm being sneaky and listening. She then starts to talk to herself.

"My arm hurts still it will be a while for it to heal." I hear here say this followed by a sob. My eye glows blue and I'm thinking she must have killed your friend but she continues to talk.

"I don't know what had gotten into my brother...I just didn't see it coming" she starting crying even more and you feel bad but you still haven't gotten and answer if she killed your friend. 

"Why am I here is anyone going to save me?" her voice is lost in her sobs. After a while of her crying you were about to tell  her everything would be okay when you heard footsteps then followed by your friends voice.

"Y/N? You down here?" your friend calls to Y/N and stops near the door.

"Y-Yes" her voice was weak but still able to be heard. 

"Oh its okay my child theirs no need to cry" your friend trying her best to stop Y/N from crying.

"Come lets go upstairs and have some pie my child." your friend says

"O-Ok" Y/N replies  and you here them both walk away.

Why is she here you question and who is her brother and what did he do exactly you continue to think until it gets dark then heads back to your house.

[Y/N POV]

[Time Skip]

"Okay my child I think its time to take the bandage off." Toriel smiles and slowly starts to cut the bandage off my arm.

"Finally the bandage on my arm has been annoying me" You laugh and watch as Toriel finishes cutting off the bandage. You look at your arm to see it has scared your arm from the tip of your wrist to your elbow. The sight makes you upset you will have to look at this forever and remember what your brother did.

"Oh it scared Toriel" you say sadly.

"Well thats to be expected it was a deep cut and scars just come from the healing process." she explains. 

"I know. But Now I have to look at it forever." you explain to Toriel sadly she walks over to you and hugs you.

"It will be okay Y/N" she says while hugging you.

You go to the bathroom to take a shower. As you turn on the water and wait for it to get hot you think about the past 2 months of living with Toriel talking to Toriel about the Underground and telling her what life was like of the surface. You told stories and read the books that she had. But for some reason you felt like Toriel was keeping something from you. During your stay you went down to visit that door multiple times to see if that guy was there and he never was , but you heard Toriel talking to him once late at night but that was it. 

The shower was hot enough and you hopped in the shower. Once you were done you walked to your room to get dressed and you went to bed. With the lights off you look at your arm the haunting scar scared you and you just wished it would go away. You fell asleep crying.

The next morning you woke up and ate breakfast Toriel made for you she left a note on the kitchen counter saying she went shopping and will be back soon. During this time you walked down to the basement and sat down against the door. Sighing heavily looking at the walls. 

"This place is too small for my liking." you say.

"Then why don't you leave it Y/N?" the guy was back.

"I don't know." You say bringing your knees up to you chest. 

"I don't know how" you say after that.

"Well for starters you leave the ruins from this door." the guy says

"R-really!!!" you nearly scream in happiness.

"Thank you so much i must be going now" you tell him then get up and run down the hallway to your room.