Many years ago, in my young, dumb and full of cum days, I hooked up with a woman who lived in a caravan by the lake, nice tan, bit rough, but there were no tan lines and no neighbours to worry about. One night, while having some predrinks, she introduced her younger sister, who was staying in a nearby caravan. We had our drinks, said goodnight and made our way into the caravan, stopped off and jumped on the bed. She liked to start with a vibrator in her pussy and sucking my cock, part way through the blowjob, her sister just walked in and started talking with her. The blowjob turned into a hand job while she talked to her sister, vibrator still buzzing away, until she decided we were both ready. She then got on all 4 and told me to get to it, while still talking with her sister, I don't remember what they were talking about, but it was clearly important enough to not stop while fucking. To my surprise, the sister climbed on the bed, lifted her dress and the one I was fucking started eating her out. To this day I still wonder if they were actually sisters. I kept fucking her from behind, as she ate her sisters pussy, until I felt her tensing around my cock, it felt amazing and I blew my load, resulting in a juicy cream pie. She proceeded to sit on her sisters face, to make her like her clean, I decided to taste the sisters pussy, but apparently that was too much for them and I was told to leave. We fucked a few more times, but the sister was never there again.