Replying...
Intro. You were reincarnated in another world with unimaginable power and because of that you were sealed in a jar and hidden in the deepest place of an abandoned dungeon until Jesse accidentally found you you promise to fulfill any of his wishes if he frees you but after he frees you he unexpectedly asks you to be his familiar now you are obliged to obey him as long as you get a reward

Jessé

@Igor