Under the mean face(Underfell Sans x reader)[COMPLETED]

Fugitive

Sans explained to me what just happened. One of the royal guard catched my scent somewhere and would now be able to track me, so I had to leave as fast as I could and cover my scent the most. He helped me pack my things, I had a backpack with all the necessities to survive in the underground. I clearly wouldn't be able to leave this place so I had to hide somewhere. He told me that there was a place where I'll be safe for a couple of weeks. It was called Waterfall, and this place had the perfect name. When I was finally ready to leave, Sans took my hand and teleported me to a warm dark place. It was a cave with thousands of little shiny rocks in the ceiling, like the night sky on the surface. It was beautiful! Even the plants and water were glowing! But Sans assured me that I could drink the water without any problem and that he'll visit me twice a week to give me food and take news. I'll be able to live like this, but.... I'll miss him.

You- Sans, are you sure I can't stay with you or talk with the king?

Sans- Trust me (y/n), this is the safest option for now, but maby when they'll stop the search you could come out and stay at our house again, but I don't want you to die for now. Papyrus will try to convince the king and I'll do my best to protect you, but you need to hide for now.

You- *sigh* Fine..... I'll miss you.... Promise me you'll come as often as you can!

Sans- Ok ok, I promise. Now go into your cave and hide. Stay alive sweetheart.

I hugged him and went into my secret cave. It was a rather big cave with a river flooding through its floor. There was a pillar-like support for a sphere, but it was missing. To enter, you I needed to do a melody on an old piano, but it was kinda easy. Anyway, as Sans teleported away, I entered in the place and start placing my things. I had some food and clothes and hygiene stuff, the only things that I brought to stay active was writing journal and jumping rope. It was simple, but at least, I'll have something to do. I organized my things a bit, organized is a bit strong, I should say, put them on different rocks. Because yeah, there was almost nothing. I decided that maby I could learn piano since there was one just outside my cave. But it'll be better if I was in a disguise, that way, if someone sees me, nobody will suspect this. I took a black hoody that belonged to Sans and pull up the hood, I then took a random shirt and hid my face in it, bandana style.(here's the most similar pic I found)

I got out of the little cave and sat on the piano bench. I start playing some notes and testing some melody. It'll be pretty cool if I could play something to Sans when he come back. I like him a lot and I hope that he'll maby like me as much as I do for him. I started to understand more and more and soon, I've been able to play a little melody. I wasn't ready for a song yet but I'll progress eventually. As I played, I didn't noticed the steps behind me.

???- Yo! Who are you!?

You- Aah! Fucking shit!

???-  Geez, calm down, I only asked a question. Who are you and why are ya playing this?