You weren't wearing your (f/c) hoodie, you were wearing Sans's hoodie. You found a letter in one of his pockets and now you were reading it at the edge of Snowdin. Blue tears left stains of your cheekbones as you cried.

Dear (y/n) or Papyrus,

If you found this letter, it means I'm dead. I know you don't want to believe that, but it's true. Cuz there'd be no way you could wash it! ;D Anyway, I know you want to kill the human. Don't. Humans are over ten times stronger than any monster. Heck, they could even kill Undyne or Asgore if they wanted to. Just, wait,

Your eyes started to glow the brightest pink the underground has ever seen as a pitch black outline formed around you. The tears soon turned black and pink as you stopped your whimpering.

And promise me something,

You dropped the letter and started to follow the dust trail. You summoned your scythe before entering the waterfalls. I could bet even Undyne would get out your way with how you looked.

Promise me that you won't try to kill the human.

You then teleported into judgement hall. Your eyes were burning like a wild fire as you saw the dust covered human. You snarled and started to fight them to the death.

They WILL kill you. Just, wait for me to come home.

And we can start over again...

I promise...

You saw the human almost ready to die, you walked over and rose your scythe high in the air as the floating hands held them down. "I promise to avenge you Sans..." You whispered before you sliced your scythe across the human's back.

Their soul shattered...

But...

Where's Sans..?