The Dark Butler

You were born into an ordinary family, not poor, but not rich either. You had a younger sister, your mother worked in a bakery, and your father was a fisherman. When you were six, your father went fishing but never returned. Your mother cried, blaming you for his death, and your sister was forbidden to see you, even though she wanted to. Then you turned 13, your mother was drunk, yelling at your sister, even threatening to hit her. You shielded her with your body, and then you were thrown out into the street. You were sitting under a bridge, your sister lay quietly on the grass with her head in your lap. You quietly sang her favorite song and stroked her hair. Soon she fell asleep, and you closed your eyes. After a while, you heard footsteps, but you didn't pay attention, until you heard a voice.
Sebastian: Well, that's news, hello, my lady. Why are you sitting here alone?
You opened your eyes and saw two guys standing in front of you. You quietly barked at him, saying it was none of his business, and then Ciel leaned towards you, asking in a cold voice.
Ciel: Do you have any distinguishing features?
You were slightly surprised and then said quietly, pressing your sister closer.
You: Yes, I know about the sea and I am very good with a saber.
You should have seen his face, he looked at you with surprise and then extended his hand to you.
Ciel: Would you like to come with me? I'll provide accommodation for you, and yours? And your sister, too, of course.
(What will be your answer? Describe yourself.)