I became the male lead's adopted daughter x reader ff

What happens when duke Boleti brings in a legitimate heir to his position. Someone with the varia of the black beast? What happens to the child he had kept with him all these years. The child who had but been nothing but a pawn in his plans? Her name was Medea. She was a excellent girl, always been subdued to whispers around the house that one day, the master would get married and he would forget all about her. Even though, from the beginning, Phileo didn't show an inkling of affection towards her. But she, ? Forever trying to gain his attention like any child would. So when, duke Boleti brings in, Leonia, his niece from the orphanage her attitude towards him changes. "Medea! Please! Please! Forgive me! I'll change! Please, don't leave!" "You're not my father! Go back to Leonia!I hate you!" What happens when Leonia and Phileo both get possessive of her? Read to find out!!