Dante del Bosque and Cerise de Stella are two people who have very similar interests who met in Beauxbatons and promptly fell in love. They were the 'it' couple in their year, having a perfect relationship history and nigh zero fights. It helped that they were also two of the top students of their generation, so everyone expected them to marry and become one of the most influential couples of Italy. They were right. However, no one ever thought what would happen after they marry.
The del Bosques' first child was named Cathryn Emmanuella del Bosque, a beautiful girl with shiny brown hair and bright brown eyes. For the first few years, everything was fine. Everything was a wonderful, peaceful family life. That is, until the topic of what kind of woman Cathryn should grow up to was opened. This was the first time that Dante and Cerise had ever disagreed on anything, and thus was the fuel of their first fight.
Cathryn loved both of her parents equally, but a part of her preferred her father more. She didn't like seeing them argue into the night, which was why she was very relieved when their fights ceased when Emelia was born. For a few months, the arguments were forgotten and they lived happily, but then they came back at full force. Her parents argued over everything that can be argued over, forgetting to properly care for their daughters. Sure, they still provided them with their physical necessities, but the children felt as if they were orphans. Their parents were always emotionally absent, so Cathryn took up the mantle as Emelia's parent.
Their family completely shattered when Cathryn turned 9. Cerise had brought home divorce papers and slammed them so hard on Dante's office desk that the two children were tempted to peer into the office. They saw their father sign the papers with only the tiniest hint of hesitation, so tiny that they mistook it for a pigment of their imagination. With the blink of an eye, Cerise packed her belongings along with Cathryn's. This was met with absolute refusal from both children, but Cathryn and Dante were adamant at separating the children. Despite Cathryn and Emelia's efforts, Cathryn was still plucked out of her darling sister's arms.
Things changed a lot since then. Cerise had returned to her home in Valencia, Spain and met a new lover, Luciano Vargas. There was still a small part of Cerise that loved Dante, seeing how similar Luciano was to Dante, but Cathryn paid it no mind. She started to secretly loathe her parents for taking Emelia away from her, but she can't do much of anything. She tried to persuade her mother in contacting Dante in hopes of being able to contact Emelia, but Cathryn never gave in.
Cathryn kept her hopes up, knowing that she and Emelia were bound to go to the same school together; Beauxbatons. Though, she never encountered her sister at the school, which greatly dampened her time there. Her seven years of schooling passed without much event and eventually, Cathryn was an adult, which means it was time for Cerise to introduce her daughter to the de Stellas' underground business. Turns out, the de Stellas were famous information brokers who have a knack of sticking their noses in others' businesses and somehow escaping unscathed.
This was how she met Piero Caracciolo once again. Cathryn and Piero were acquaintances when they were young but lost contact once her parents had divorced. Imagine Cathryn's surprise at learning that Piero was also in the underground business. It wasn't long until Piero became Cathryn's favourite client. Cathryn became fond of his adopted daughter and her Metamorphmagus abilities, but never had the chance to look after her while Piero's gone because she had her own businesses to deal with.
She didn't know when her own fondness for Piero became affection and affection became love, but it did happen without her noticing. Knowing that beating around the bush won't help her, Cathryn decides to well, just confess to Piero. And by confess I mean stating it outright to him and asking him if he feels the same literally a few minutes before he goes to probably his last mission. He promised her he'd reply when he gets back, but he never did come back. That asshole.
Cathryn, knowing that Emelia (Piero's adopted daughter) would be sent to an orphanage due to the lack of a legal guardian, now ventures to England to adopt her legally. Piero owes her one.