Hello Guyz... This is kind of my first story. There are this stories that I want to give a shout out to because it inspired me to create this fanfiction that maybe or maybe not has some part of it. Not sure though. The story of this fanfictions is "Portal of Memories" by HeidenShadye at Ao3 and maybe "Glitch" though I am not sure who they belong to. I was excited 'cuz there are some ideas came to my mind while and after I was reading it. 

The picture ain't mine, Au's ain't mine and surely Undertale ain't mine also. All of them belong to their original creators. OOC might be found in this story but will try to stick them from the original.

Hope you like mine. Start the story.

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Maniacal laughter rang at a distance.

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An ear-shattering scream resounds a two-story house for a few seconds before it became silence. Underneath a door, there is a glowing light. Inside, there is a mess and items are suspended in the air by a sky blue aura. A figure on the bed is sitting straight up, grasping their chest to calm himself down.

Once the silhouette calms down, he notices the floating objects and slowly put them on the ground. The moonlight shines through the window showing that the figure is a skeleton. Sans woke up from a reset that comes from the other timeline where the kid, Frisk is possessed by Chara and killed everyone.

Seeing the room that he has when they're at the Underground, he resigns for another round of almost predictable future. Listening, he hears pots and pans banging downstairs Sans sees that the time is 8:25 a.m. Figuring that he should wait for Papyrus to come upstairs and knock on his door. While waiting, he reminisces about the times they were at the surface.

Time passing by he almost didn't notice that Papyrus steps are getting louder. Stopping at his door, the small brother of his knock loudly on his door and yells "SANS, YOU LAZYBONES. WAKE UP ALREADY. THE GREAT PAPYRUS HAS CREATED HIS AMAZING SPAGHETTI. NYEHEHEHEH."

"5 'ore min'tes bro." "NO NO MORE WAITING. THE GREAT PAPYRUS' SPAGHETTI CAN'T WAIT FOR MINUTES" Sans gets up from his bed and pretends to be sleepy when opening the door. "m'kay, bro."

The brothers go down to eat Papyrus' spaghetti. While eating Papyrus was talking about on what he would do for the day while Sans agrees and praise him for it.

After eating breakfast, the brothers said their farewells to each other and headed towards their destination. Sans, towards his sentry post and also to the RUINS door to exchange puns, and Papyrus towards Undyne's house for cooking lessons and training.

Walking along the road towards the forest, Sans greeted the monsters along the way stopping to make puns towards them. After that, he walked towards the sentry post to get a ketchup bottle underneath. Leaning on the table, he found ketchup and started drinking it while leaning for support. Knowing that the former Queen Toriel, his pun buddy, is waiting. He finished his condiment quickly.

Walking towards the door that separates the Ruins and Snowdin, he silently prepared himself for the promise. A promise that he has to make for this timeline and the same promise he made 乃ξꟻӨʁξ ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ ̴& ̴Өʋξʁ...

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In the woods, there is a resounding crack, not too loud to be noticed by the Skeleton. 

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Standing outside the door, Sans breaths in quietly and started a conversation.

"knock knock?"

"Who's there?"

"dishes."

"Dishes who?"

"dishes a bad joke."

A snort then laughter came from the door.

"Knock Knock?"

"who's there?"

"Old Lady."

"old lady who?"

"I didn't know you could yoldel."

Sans laughs a bit genuinely as he hears his pun buddy again. The friends separated by the doors continue to exchange jokes for hours. Few of the last jokes Sans knows it's about time to do it again.

"Hahaha, haha, ha..."

...

..

.

"hey... uh... lady... um... you 'kay?"

"I'm fine. Though may I have a request to you."

"huh... what kind of request lady?"

"If a human ever comes through this door... could you please, please promise me something? Watch over them, and protect them."

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"...will you not?"

...

...

Letting his eye lights vanished on the promise.

...

...

...

He lowered his head as if not allowing anything or anyone to see his face.

...

...

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"... of course, I will."