... Wild guess here: Yuki is a major dom, and Rei used to be her unwilling sub, got tired of that and ran off with a girlfriend, who posed as a police officer arresting Rei for role-play purposes. Yuki is tracking down her wayward sister to return her to her "loving care".
That's not the problem.Kneel down on all fours...?So now you want to throw me away after having your way?You don't like me looking at you, right?Are you that much of a scum?What should I do then!?How did it come to that!?Then what do you want me to do?and apologize for trampling on my rights as a human.I will feel more satisfied then.Kneel down on all fours,So if I'm gone, you can go look for your sister however you like!