~Fear~ [Undertale Oc and Reader Insert]

Lilith and (Y/N) have been Experimented on by their father. Using left over "goo" from Betty Noirs' attacks, he was able to extract the fear from it and insert into (Y/N) and Liliths' souls. In attempt to save them from their father, Their mother, in attempt to save them, ran up Mount Ebbot to hide. He ended up finding them, so their mother was forced to jump, unfortunately dieing from the fall. This happened when they were children. When they explore the underground, they come across a Neko girl named Marri. The twist? None of them are supposed to be there