She wanted me to work on her arse and she wanted to play with the anal vibrator first. That was a fun surprise, its been a while. Her horniness was re...ching her anus, and so my finger first soothed her ring with massage oils, then she inserted the pointed vibrator and gently pushed. It slipped in and buried itself. The vibrations echoed through to her clit and my tongue explored all the area between clit and anus. Beautiful, wet, warm, oozing with enjoyment. My fingers then worked inside her. Her ass is really wide and certainly the highlight of her body. She has a thing for mini shorts that are just big enough to cover her ass cheeks, ending just beneath them. She is very fair and has a slight tan. Now she is not exactly what you would call a bright child, very bad in studies.Although we tried to convince her to take commerce, she took science. We are very close and open to each other. This story is about how I ended up fucking my sister while trying to teach her physics for her. She sent images of herself in underwear to tease me. I was dying to meet her and I guess so was she.One fine day, she messaged me, “What are you up to this weekend”. This was the most exciting message for me.I hurriedly replied, “Depends on where this conversation is going. If my thoughts are right, then I am probably doing you this weekend” I sent this with a winking smiley.Rupali replied, “This Saturday, My place, after dinner.” I was damn excited.Finally, the day came. I drove to her house. My chance came one day when she came to my room to ask show me a particular file on my PC, She came and stood next to me . I pressed my leg against hers and kept it there waiting for a reaction.First she moved a little back, I waited for a minute and tried again, This time she looked very embarrassed and tried to continue speaking without looking, Encouraged, i kept my leg as it is and continued. After a few minutes she went back to her table and sat there looking confused and kept shooting.