Sebastian and Ciel's relationship has changed after their contract ended. Ciel is no longer serving the queen but, like always he's managing his business under Sebastian's supervision.
I don't know how to summarize it so I'll stop there. You can't judge a fanfic by it's description, though it gives you an idea on how screwed up it's going to be.
Sequel
Sebastian x Ciel 2
(Fuck my naming sense, eh?)
Story about a girl called Lily, whose family is falling apart. She is given a mysterious letter, asking her to compete in a series of trials for a prize; one wish. Will Lily win, or will she perish with the others?