Blood and Bones (Sans X Vampire!reader)
*Inspired by werewolf readers x Sans*
Your parents had been killed when you were young.
Assassination, plain and simple.
Thanks to your father, you had inherited the recessive gene he and his father had possessed, making you a vampire, your mother only being a half-fang, having earned a love bite from your dad when they were together.
Now 16, you decided to leave the small home you lived in with your now senile grandfather in order to try and explore further points of the world.
This led to you falling through a hole in Mt Ebbot onto a bed of flowers, thus starting your adventure in Undertale.