Finny x Reader - Demonned

You live in the Phantonhive manor, more specifically, in Sebastian's room, being his daughter. No one knows you live there, or even exist, not even Ciel. You are never allowed to leave this room, only able to listen to the things that go on throughout the rest of the household and watch it's other inhabitants through the windows. one in particular has always caught your eye above the others, the Gardner, Finnian. One day, you are finally fed up with it, and decide to leave Sebastian's bedroom.