Auror Nymphadora Tonks

When Harry woke up he looked around, he saw that he was in a compartment with all of the blinds closed and a pink haired woman who looked to be twenty three.

"Wh-what am I doing here? W-who are you?" Harry asked tentatively, not sure what was going on. He got up to look around, but before he could get anywhere the woman spoke.

"Wotcher Harry, I'm Nymphadora Tonks and you are now my fuck toy," she said claimed proudly.

"W-what, now way am I anyone's slave!" Harry said angrily.

Harry was going to demand what was going on again, but before he could Tonks said, "stop talking and sit down."

Harry for was unable to stop himself from closing his mouth and sitting down on the seat across from Tonks. He looked at her angry and unsure of what was going on.

"Good boy," she said teasingly, while standing up, "When you were knocked out I made you sign a magical contract that forces you to obey my orders. So from now on you have to listen to what I say."

"These are my orders," she said with her hands on her hips and a smirk on her face, "You won't every try to tell anyone about the slave contract. You won't ever try to destroy the slave contract. You will act normally when we are not alone. You will never divulge who you are, or who I am. And finally when alone you will address me as Big Sister Tonks."

"Y-yes, Big Sister Tonks," Harry was forced to say.

"Good toy," she teased, nodding her head.