Amelia d'Assy : cousin of Ciel Phantomhive (Black Butler fanfiction)

What if Ciel Phantomhive didn't have only one aunt? His father was the middle child of Countess Phantomhive. He wasn't meant to be the heir. His older sister Charlotte Phantomhive was supposed to be the Watchdog of the Queen. Instead, she went on an adventure and became the head of the Phantomhive's spy network and married Charles d'Assy. Her only daughter, Amelia d'Assy, is as adacious as her mother. She is the hidden shadow of her cousin .Ciel Phantomhive, Watchdog of the Queen. How will she meddle in his shaddy business as a lady from a good family? Not everything is the way it seems to be. What secrets is she holding for her family?
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None of the characters except Charlotte, Matthew, Amelia, Liam, Cheng/Charles d'Assy belongs to me. These other characters are the creation of Toboso Yana, author of Black butler, Sherlock BBC, Hikaru Miyoshi, author of Yukoku no Moriarty, and Cassandra Clare (Shadowhunters), Nancy Springer (Enola Holmes) and Julian Fellowes (Downton Abbey). And for the attentive readers, to Elena Ferrante ( My prodigous friend) ;).
The image doesn't belong to me : unknown artist
Rankings :
# 1 Queen Victoria
#23 Phantomhive
#25 Ciel Phantomhive
#7 in Moriarty
#50 in Black Butler
#70 Grimreapers