Your father, Bruce Wayne, had decided to take into your home a boy after his parents died on the exact same night that you two went to their circus show.
His name was Dick Grayson and he had just lost everything. That's all you knew about the boy.
Your dad and Alfred, who was like a grandfather to you, had spoken to you about accepting the boy and helping him adjust to his new life. After all, he would be living the same life as you.
All this time, it had always been you and only you in your father's and Alfred's life. You were the center of attention. You were their little princess. You were even like a Gotham princess. How come it wasn't going to be just you anymore?
Maybe it intimidated you, or annoyed you. Or maybe you just pitted the boy so much you didn't want to show it.
Today was the day Dick Grayson would be arriving to the Manor. Alfred hadn't paid much attention to you all day as he had been busy making arrangements to give the boy a proper welcome.
Now, you heard a car pulling over at the door. You looked outside a window and realized it was him getting out of the car with one single backpack on his back and a not so happy expression on his face.