Fics like The Way to Protect the Female Lead's Older Brother - reader insert

The first daughter of the Pherion of White had spent almost her entire life being overshadowed by her younger brother. Originally the heir to the family, she'd be quickly cast aside when her Mother's third husband gave birth to a son. Leonard was the most prolific Pherion of White. However, the family's disregard for our protagonist led to her training herself in private in the dim hope she could overcome her brother, and kill him. But, one day she is tasked by her mentor to break into the most dangerous household in the empire and assassinate their eldest son. However, it turned out her family set her up to be killed in the process. Now, instead of being killed, Dion of the Agriche of Black is holding her captive as one of the family's infamous 'toys'. His apparent lack of interest in other people is broken by their appearance, and so begins a dangerous love story of obsession, power, and blood.

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