Where am I? Human!Sans x Monster!Reader

Ok I am aware this is weird but I just kinda had this idea what if the two were switched and the humans lived in the underground. Please don't murder me over this I personally like the idea. If you don't like it GO AWAY! Also you're basically replacing the main character in the storyline. Don't question me. Stop judging me ;-; . Oh yeah also this is a MAJOR spoiler alert for the pacifist route of Undertale.