My Sister_(2)

I want to tell you about my sister. She has always been a bit of a tease and has flirted with me quite a bit just latley. Her name is Jo and she is three years younger than me. She is 16 years old and blonde with shoulder length hair and she has a lovely curvy figure and big tits. She looked fantastic. One day i was in my bedroom and Jo called me into her room to help her with a poster she was putting up. I put it up for her and we both sat down on her bed to look at it. It looked good and we began chatting. I had always got on well with Jo but i never thought of her in a sexual way before until recently when she started flirting with me. We spoke for a while and i thought she looked sexy, she was wearing a white crop top without a bra and she had black jogging bottoms on which made her arse look big and round. As we sat next to each other she leaned across me to get her diary out of her draw. Her tits rubbed against my arm and i got a hard on. I think she noticed that i was aroused as i got straight up and left the room. I went downstairs and she followed me i looked behind me and as she ran down i could see her tits bouncing around.

The next evening our parents had gone out for the evening leaving Jo and i alone. We were watching a video downstairs and Jo was lying on her belly on the sofa. I sat on the arm chair watching her. She had noticed i was watching and she began moving her bum. She had a blue short dress on and i could see her white knickers as she wriggled her juicy arse. I watched her clenching her arse cheeks together as she thrusted up and down. It looked like she was shagging an imaginary person and i wished i was underneath her. My cock was hard and i tried to hide it because i was only wearing a pir of shorts. She looked at me and i thought she was giving me a sign to go over to her by the way she moved her butt. I went over to the sofa and without thinking about what was happening i layed down on top of her. She was still bucking her hips and my hard cock pressed against her arse cheeks.