I was begging at her toes and crying out loud and told her that I can do anything for her if she won’t tell our parents. She thought for a minute an...d asked me, “Anything?”I said, “Yes sister, I will do anything”.She said, “Ok. Then you need to be my slave whenever we are alone inside the house. Also, in the morning after waking up and before sleeping, you need to drink my piss and eat my shit.”I was so shocked listening to all these coming out of my own sister’s mouth. But weirdly, I also felt. Her name is kajal. We are both studying final year engineering. In our class, there were 2 sides. One boy’s side and the other was girls. Valentine’s day was just 1 week away and I was single at that time. I knew I would be alone on valentine’s day. I was sitting in the class, it was damn boring. So I took my mobile and started playing games. I got bored and then suddenly a funny idea popped up in my mind. I thought of sending ‘ I love u’ msg to some girls of our class and see how they react. .what would everyone think if I left the best and highest rated university in the country? I needed to do as he said and learn my lesson. “Yes, Sir,” I said, slipping off my panties until they fell to the floor, and lowering myself down onto the top of his desk.“Pull up your skirt, Iris,” Mr. Allen demanded. “Let the whole class get a good view of your ass.”I did as he commanded and glanced over my shoulder to see all my classmates smirking happily. It was a competitive school, and they. Suddenly, she grabbed my head and pushed it into those sweet juicy loins. Taking my cue, I sped my tongue up and concentrated on her clit. I could see wave after wave of ecstasy wrack her body. Gasping, she finally pushed my head away and said "You gotta give me a minute." I thought to myself that this was a good sign. I started kissing her again and she pulled me on top her. She had been playing with my hard cock and knew it was hard. I plunged it in and ground it home while kissing and.