The broken pact

Hi! This time, the book will be about a spiritual familiar that has disobeyed his owners but it's still loyal to the family which has the blood of previous blood pacts, to confirm the bond and ownership of both, the familiar and the owner.
This familiar has lived for more than 500 years and due to something that happened in the past, he is now trapped in a limited territory. The lonely familiar has been hiding himself for a long time, that has changed his appearence, but one day, a little girl appears and helps the spirit.