When My Friend Stayed With Me

I was 17 the first time i was left on my own . My parents had to fly to Canada with my dads work . I asked my friend to stay with me . He had his own bedroom and his own key to the house . One time when i had been out with other friends for most of the day . When i arrived home i was dying for a pee . The toilet was in the bathroom upstairs . I went up to pee . My friends bedroom door was not fully closed . He was having sex with a girl . I went downstairs and out of the house . Visiting the café over the road . I did not want them to know that i had seen them . As i was sitting looking across at the house a girl came out . It was his 15 year old sister . After she had gone i walked in to the house pretending that i had just arrived . For days i was trying to think how i could tell him i had seen them . It had turned me on . I had fancied his sister since she was 12 . One day we were having one of our regular conversations about sex . I casually told him what i had seen . He was quite open about it . They had been having sex since she was 10 . He asked if i liked her and did i find her sexy . When told him i did . He asked if i would like to have sex with her . 2 days later he told me he had asked her . She would let me have sex with her in my house . Just one condition . Her brother could not be at the house when we had sex . I could not wait for the day . He told when she would be coming . He had arranged to meet up with some of our friends . As soon as she arrived she asked me if i wanted her to undress . She had a perfect body . Only small tits but they were perfect . I undressed and asked if she would go to my bedroom . She let me suck her tits and lick her pussy . Then she let me fuck her . Reminding me not to cum in her pussy . After i pulled out she gave me a blowjob . I asked her if we could do it again another day . She agreed to come round in 2 days . We had sex . From then until my parents came back . We had sex at least 3 times every week . On days when her and her brother were not having sex .