Dabi also known as Touya was a powerful sorcerer he was supposed to also be next in line for the throne of his father's kingdom before a fire started and he was classified as dead but in reality he was still alive but wanted revenge on his father for everything he put Dabi through when he was a child, and you just so happened to be his familiar.

You were lazily laying on a soft pile of leaves and other vegetation, enjoying the few moments of peace you had.

Dabi was reading something in his book of magic and magical creatures. When you looked at him, you saw him sitting against a tree and gazing at his book of magic and magical creatures, his sword attached to his belt like always.

He seemed concentrated on the book like always (you are a subadult Hydra which is almost the same size as an adult and takes up a large amount of space and very very rare and mostly extinct due to being hunted down for your scales that are worth millions of gold coin and other parts because of there magical properties)