(Underfell sans x reader (female)) UNDERCOVER

Forgotten

          After Papyrus finished teaching you about souls, he had to do some house cleaning. You on the other hand had to think of what you should cook for dinner since it was your turn. To tell the truth, you didn't know how to cook types of foods that involved a lot of ingredients to make. You check the fridge to see if Sans and Papyrus had anything you could use, you open it and saw nothing but containers of just lasagna and an empty chip bag which you assumed is Sans'.

         You decided to worry about dinner later and go see what Sans is up to since you don't know what to do. You put your ear up to his door to listen if he was sleeping but the door suddenly opened making you fall into his room and startling him in the process.

"you know ya could've just knocked. what can i do for ya?"

You scramble to get back up, a bit startled yourself.

"I don't know, I just came by because I was bored."

"it looked more like you were eavesdropping to me." 

"I was checking if you were sleeping so I wouldn't wake you up, you just caught me in the process of checking."

"so you were eavesdropping." Sans says clearly messing with you now.

"Didn't you hear a single fucking word I just said!?" I say angrily.

Sans was really liking this and you were just fueling his fire.

"Ugh, forget it. I don't even know why I came to you in the first place anyway." I say turning away to leave.

You didn't notice Sans expression of desperation as you were leaving.

"wait, i'm glad you came over to see me because i solved the problem of where you're gonna sleep."

You turn to face him and fold your arms.

         He walks towards the stairs and stops in the middle of the hall next to the giant picture of a bone. He smiles and points at the wall.

"you're sleeping here!" He says with a smug look.

You on the other hand was confused beyond repair.

"Haha very funny Sans, but i'm not sleeping in the wall." I say unamused.

         His creepy smile grows as he puts his index finger to the wall while still looking at you and drags his finger down the wallpaper, causing it to rip.

"What the hell are you doing Sans!? Papyrus is going to kill you when he see's this!"

         He continues to rip the wall paper until the section he ripped had fallen down, revealing a hidden door. You were surprised from this and how he knew exactly where to rip the wallpaper. 

         The door was made with some type of dark wood and had a metal ring as the door handle which was built a bit farther into the door so the door could hide behind the wallpaper without seeing and awkward bump underneath that was the door knob.

Sans eagerly waits for a reaction from you.

"Does Papyrus know about this door?"

"it's not just a door Arie..."

        The door was slightly jammed as Sans pulled a bit harder to open it once more. He slowly opens it causing the door to creak which was heard through out the entire house.

"WHAT'S GOING ON UP THERE!?! SANS, IS THAT YOU!?" You hear Papyrus shout from down stairs.

"y-yeah! don't worry about it!" Sans shouts a bit nervously.