Echo In The Mirror: Undertale Sans x Reader

Y/n is a human yet there's something about her that just doesn't seem right. She has a guardian, a guardian whose job is to protect y/n from harms way, but they are no guardian angel, more of a guardian demon. However she falls into the underground despite their guardians protests and she meets a punny skeleton. They will have many adventures together, some fun, some...not so much.
Y/n quickly falls in love with the skeleton and the skeleton falls in love with her.

I'm writing this on a phone so it might look strange if you're reading on a computer. So sorry. I hope you still enjoy anyway. Also I do not own the cover art or any of the other art. So they belong to their respected owners.