A Slave Indeed

Jenna Mc.Node is a girl who is the Duchess of London. She is also friends with Earl Ciel Phantomhive, they have tea on Wednesdays. Jenna is the head of the Mc.Node family and owns the music business. Strange enough, she also has a demon butler named Azure. He is supposed to serve her until she retires from the music business and makes it big, keeping her safe within the process.
But when Jenna makes some unknown enemies with Earl Phantomhive, could the deal break within just one gunshot?