You are the last daughter of your family, you have an older brother named Rein, he is kind, caring, and sometimes protective without you knowing he is a siscon

One day your parents divorce and the judge tells you to choose between the two of them

Judge: "Do you choose mother or father?"

You thought a little and finally you chose your own brother, Rein was surprised but finally smiled a little with satisfaction Rein mutters to himself

Rein : "Huh, she's good enough to be my mistress."