Blueberry (Sans X Reader - Underswap)
No description, read it to find out what happens! (You can already tell what this story will be based on :D)
I DO NOT OWN UNDERTALE, NOR DID I CREATE UNDERSWAP. ALSO CREDITS GO TO THE PERSON/PEOPLE WHO CREATED THE COVER PICTURE
Also check out RichaadEB on YouTube. He did amazing 'metal' covers of boss songs.