A Demons Sister (Black Butler and OHSHC)

Hii

So I am working on chapters that will be published in groups so don't worry but I had a question if I was to write a new book which idea do you like best

1:Two gods came down to earth one day out of boredom, neither knowing the other's plans, they run into each other in their human forms and instantly hit it off

2: A king/Queen one day receives a package, once opened, a demon is released, but the catch is, the demon must listen to the person who released it

3: There was an old tale of two insanely powerful magicians who fought constantly, but the legend had died out... but the two knew the story. They had settled their differences, and had decided that there was a bigger threat: mankind

Pls let me know