Science Project

I'm Keith 20 and studying science at university, I also was building a project for a competition. I thought it might win one of the prizes and give some extra cash. I had built it in our basement and had finished and delivered it to the competition committee for judging. I had an earlier version of my project partly built in the basement, I intended to dismantle it on the upcoming weekend. My sister Leslie 23 came home from work, having broken up with her then-boyfriend Donald. She wasn't happy at the time and finding a bag belonging to Donald threw it into the basement. Then hearing a loud crashing noise went to see what had happened. She was mortified to find the bag had hit my project and it was in pieces all over the basement floor. I arrived back a little time later and Leslie met me and said she was really sorry for breaking my project and told me she would make it up to me if I didn't tell our parents. I've always been a nerd and the butt of Leslie and her friends jokes, this was the first time I had something over her and so I played it up a lot. I went into the basement and started picking up the pieces and saying it would take me all night to fix it. I asked her to leave me to get on with it and she did. I cleaned up the broken project storing away the parts for a possible project in the future. I came up when I was called for dinner and when asked by my father how my project was going I said I hope to hand it in, in the morning. To the relief of Leslie, after dinner, I returned to the basement and done studying and then went to bed. Leslie had already gone to bed at that time and she was gone to work before I got up in the morning. I went to university and got home just before 4 pm, a short time later Leslie got home. On seeing me she asked did I get my project finished in time. I said I had but hadn't had time to test it and if it doesn't work I won't get anywhere in the competition. Leslie said again she was very sorry and would make it up to me. The next day my father went away for a weekend golf trip with his cousin and once I was home from university I was going to Leslie that I had got second place in the competition. But she wasn't home yet and our mother told me that she was going to visit her sister for the weekend and that Leslie and I would be alone till late Sunday. I didn't like the idea of being alone with Leslie all weekend, I then decided not to tell her of my prize win until the next week. Leslie arrived just before mom left and I wait to see what she would say about her plans for the weekend. A party with her noisy friends most likely. Leslie asked me what I had planned and I said I would do some studying and she then asked didn't I want to go and see my friends or meet a girl. No, I don't have a girl to meet and my close friends are away on a field trip this weekend. Why didn't I go she asked, I'm not doing those courses I replied. Well, then she said I think I should make it up to you for breaking your project. I looked at her with a puzzled look and she said I will take you out on the town for some excitement she replied. I said I'm not the excitement seeking type and would rather stay home and study. Leslie then said she would take me out for a meal and then a movie and then we see how that goes. I nodded and about an hour we headed out together, I must confess I enjoyed the time out with Leslie after the movie I wanted to return home and not go partying with her. But she insisted that she stay with me and we returned together and I thought she had finished her making good for breaking my project. But I was wrong, Leslie asked me had I ever been with a girl and I said no. Leslie said she would change that and grabbed my arm and led me to her bed. She then undressed me and she went down on me, I was going to tell her about the project. But got too excited at what she was doing and went along with it. She had me lay on my back and she mounted me and I was really enjoying it and only just remembered to tell I was going to cum. She said it's okay I'm on the pill and took my sperm inside her. We had sex twice more that night and we showered together the next morning. I knew I couldn't tell about the project now and decided to keep it a secret. She had sex with me 4 more times before our parents returned. On Monday morning the results of the competition were in the newspaper and my parents said they thought I had done a good job on my project. Leslie said I would have probably won if not for her breaking it. I told her no I got what my idea deserved, the other project was better than mine as an idea and on its construction. She smiled and told me she would treat me again soon with a sly smile on her face. I can't wait.