Denji x reader

Your a girl who lost her mother at 4, your father ran away. You where stuck living with your grandmother but she soon passed. You had no where to go, you where only 6 when she passed. You met a devil at the dumpster and it became your main weapon, his name is Paws and he is a cat. You meet this strange lady, she invites you to stay with her but in exchange you have to become a devil slayer. You live with her and train under her until you are the age of 16, a group of strong people attack you and kill you and Paws. Paws has the strength to drink some of your blood, and he gives you his heart., you are now a devil, you are then later assigned the job to find the chainsaw devil. You meet Denji.