Brother and Sister

My name is Harry and my older sister is Sandra. This happened when i was 19 and Sandra was 22.
I lived at home and Sandra lived with a friend in the next town. Sandra would come home know and then but not very often. Mum and dad had a holiday house and they would use it on a lot of weekends. When they went away i would stay home most of the time and when i was home alone i would love to be naked.
This weekend mum told me they were going away and they would be going Friday morning, she also told me Sandra may come home Saturday sometime. I got home Friday and stripped off. When it got dark i went into the back yard - naked - and wandered around. I went to the back fence and checked out the neighbor's. They were naked as well so i stayed a while and watched them as the cuddled each other and they played with each other. I jerked off and when i cum i went back into the house. After watching tv for a while i went to bed. I slept naked.
When i woke up i had a shower and went to the kitchen and made a cup of coffee. I then went a stood at the back door and thought about going outside. All of a sudden i heard someone say good morning. As i turned around i saw my sister - Sandra - standing about 3 mtrs behind me, she was naked except for a small, brief undies on but see threw. She smiled at me and then asked how i was. I covered my hard cock and chatted for a while. Sandra then asked how long i have liked being naked and i told her ever since mum and dad go to the holiday house. I then asked Sandra how long has she liked being naked and she told me since she moved out and her friend likes being naked as well. Sandra then removed her undies so she was naked completely. We sat on the lounge and talked for a fair time and all the time i checked out her tits and her pussy. She kept opening her legs know and then so i could see her pussy. She was clean shaven and she was wet. I saw Sandra checking out my cock as we talked. It was rock hard and i liked Sandra looking at it.
Sandra got up and walked over to the back door and looked out. I was so horny i got up and went and stood next to her. Sandra took my hand - opened the back door and led me outside. We walked around the back yard for a bit and then took me down the side of the house. We stopped near the side fence at the front of the house and watched the people walking by. I said to Sandra i wish someone would see us standing here.
She looked at me and then said i could touch her if i wanted. We faced each other and i touched her tits. Her nipples were big and hard. As i played with her tits she put her hands on my chest and played with my nipples, it felt so good as nobody had done that. After a while i moved one hand down to her pussy - it was so wet - and i fingered her, I slipped a couple of fingers in and it was not long and she started to moan. I felt her hand on my cock and she started to jerk it. We were both in heaven getting close to Cumming. Sandra told me to open my legs a bit so i did and she slid my cock between her legs and started moving back and forward. It felt so good and as i looked into her eyes she moved forward and kissed me - with her tounge. As we moved back and forward i could feel her pussy getting more wet and i was getting ready to cum. I could see people walking past and wanted someone to catch us and come and watch. Sandra cum for the second time and then i told her i was going to cum. As i cum i did over her pussy and her arse. We cuddle and kissed for a time before going inside. Sandra took me by the hand and led me to the shower where we showered together. After the shower she led me to my bed where we kissed and cuddled for a while. She got on top of me, smiled at me before taking my cock and feeding it into her pussy. We fucked for ages before she told me she was going to cum and as she did i cum as well.
the rest of the weekend we stayed naked, kissed and fucked until she had to go home.
Every time mum and dad go away Sandra comes and stays. Every time she comes over we try different positions and things.