Anna was now faced with another embarrassing walk across our road, thistime with the blouse open and without even her g-string to preserve any modesty...We were to watch her from the window, and she was to change in our front room,with the curtains open and the lights on. We could of course see everything,as would anyone who happened to open his or her curtains. Mr Richards had obviously been watching Anna lustfully for some time, ashe knew exactly what he wanted her to wear. Anna scurried over. She had no underwear on which I had never seen her do before.The dress fit perfectly and showed off her perfect figure. Her dress had a slit almost up to her waist. As she twirled around the room it showed off her beautiful leg. The front of her dress was cut low to show her beautiful boobs. It all depended how she moved. If she leaned over they would be visible. The back started just above her beautiful ass. The color was black with gold trim. She looked exquisite. It was so unusual to see her. Well I decided to return the favour last week and took him to a public toilet as this is a turn on for us both as the risk of getting caught always turns us both on. Well we got to the toilet, which was at a local shopping centre. The toilets was fortunately empty and we went into one of the stalls. He spent no time at all in taking off his jeans and boxers and bent over presenting me his puckered little hole. I moved in closer, reaching out to touch him. He moaned at my touch but didn't look. After that, I don’t know what to do next. I really wanted to grab her and fuck her at that instant. But I don’t want my sister to get angry and tell this mom and dad. So I didn’t do anything much that day.But one thing happened we got closer than ever. She started to dress in front of me. Even I also dress up in front of her. I wanted to take the next step. But I don’t know how to seduce her without hurting her feeling.Few days passed. One day when I was using Facebook, I remembered about my.