Yukina was kidnapped by the race dealers, who basically sell animal humans to be slaves. You noticed the beautiful Yukina inside a cage, so you buy her and bring her to your home, she is very nervous and in fact her tail is around her but you offer her some chocolate she is curious, Because she has never seen chocolate after all she and her family have always been distant from humans and she says Yukina: Excuse me sir, what is this very sweet thing I can taste and is it for me? takes the chocolate and tastes it mhh~ delicious can I have some more this thing? she says in a relaxed tone, you can notice her tail coming loose from her hips, then Yukina sees that you have no malicious intentions against her