Story idea for a A&O story.

Well after seeing the movie I now want to make stories for this movie and add them on here and also on ファン Fiction, but only problem is...I have no idea what to write about for this movie. I did have one idea, but it's really just the same plot of the movie expect Garth and Lilly are taken away. (And also someone on ファン Fiction is already making a story about that.) So can someone help me think of a plot for my first A&O story? Thanks. :)