Monsters Mercy (Underfell Sans x Reader)

UNDERTALE?? IN MY 2020??
-Gender neutral so it's for everyone!-
-Underfell-
-most art comes from deactivated artists so I will try and credit as accurately as possible!!

Many years have passed since monsters were banished underground for bringing upon a war against the humans, once they were lost to their own rage, Mount Ebott turned into a tall tale. A story about the mountain being cursed and having hidden ways of trapping people underground. They say if monsters did exist, they had no mercy in their souls. That humans were the 'good guys'.
A human that fell into their world, found the tales were true about monsters existing but hopes they couldn't be as ruthless as they have been told. They wanted to believe that even these so called horrible monsters can be good if they just tried.