"Yes? Why have you called me, father?" Hinata asked, panting as she stepped into the Hyuuga sparring room. Hiashi was sitting at the end of the room with his usual stoic face, Hanabi facing him in her black fighting clothes. Hinata stood next to her, and Hiashi explained,
"Hinata, it has come to my attention that you are no longer fit to be the heir to the Hyuuga clan. I wish for you to fight against your sister. If you can win, you will prove me wrong, and maintain your place as heiress, with her as your slave." Hanabi looked a bit discomforted at this statement. "However, should you lose, she will become the new heir, with you as her slave. Do you understand?"
"Yes sir." Hinata bowed slightly.
"Then face each other." Hiashi ordered. The Hyuuga sisters turned to face each other. "Bow." They did so. "BEGIN!"
And so they fought, Hinata only barely able to stand up to her little sister's strength. Hanabi may have been smaller, younger, and physically a little weaker, but she had far more confidence in herself, and she knew her way around taijutsu better than Hinata could hope to be. Sure enough, Hanabi won easily, and once Hiashi gave the order to end the fight, he stood, walked up to Hanabi, dropped something black into her hands, and said,
"Do with her what you wish."
Hinata gulped as Hanabi reached up to her and placed a collar around her neck and kissed her full on the lips.
"That collar means that you are now my property." Hanabi explained. "It recognizes its master through lip contact. So now, any and every order I give you, you must obey. No matter what. Do you understand?" Hinata nodded. "Then come with me." Hanabi led her sister to her own room and stripped her of all her clothes.