." she cried as she began to shake and twitch uncontrollably. Mrs. Graph wrapped her arms around me and pulled me against her as she placed her mouth ...ack on mine. Her moans and cries of pleasure were forced deep into my own body as she continued to cum. I could feel her pussy quivering and twitching as it gripped at my cock like a vice while I continued to thrust deeply into her. After a few moments I felt my teacher begin to come back down. Her face pulled back from mine leaving only a string. What was worse was that she realized that she was behaving differently in order to achieve her rewards. She was being the best slavegirl she could be.Each night, she was bound again with her wrists held securely behind her back and then locked into her stall. She never had a chance to escape. She had either been locked up or bound or both since that day she had been mucking the stall.The girls seemed to delight in their slavegirl’s body. When they were not training her, they would frequently. But this don't seem to slow her up. We get to the spot and drive round to the back of the car park. No one around pitch black, perfect for some funny anyway. About 15 mins goes past and a couple of cars come in. The come close by and L doesn't flinch. The park about 20yards from us. I tell L and she just shrugged as her head bobbed on my cock. I know the sign to give out. So flick the light on and then off. Sure enough a couple of guys in the 40's get out of one car and come over hoods up. He started a rhythm, getting himself going on me, but then he stopped. “This isn’t working,” he said, pulling himself out of me. He sat up and pulled off his suit top. I gasped at his chest. He had a huge, muscled torso with a flat stomach and strong, thick arms. He picked up the vibrator and said, “Get up and turn over, on all fours. It’s time to do what reindeer do.” “What reindeer do?” I asked. I got up like he asked and turned myself over, thrusting out my curvy behind. I had tasted his.