If the Male Lead Becomes Obsessed with the Villain Family's Youngest Daughter

I became the beloved youngest daughter of the strongest villainous family in a hardcore 19+ novel. Moreover, fitting for a member of a villainous house, is there anything I can't do? From martial arts and poison brewing to bomb-making and archery, I've mastered it all. "Brother will protect you. Our Estia doesn't need to be able to do things like this." "No, you have your big sister! Don't worry, Estia. I'll get rid of any bad guys who come your way." Brother, Sister... we *are* the bad guys. I didn't want to kill people. So, I tried to live while hiding my true abilities... But the male lead is weighing on my mind. * For the peace of myself, my family, and the Empire, I pushed forwa...