I was a little girl who had a friend who was a senior at my part-time job, and she showed me a picture of my sister! My sister, who was always nagging me about my slutty ways, had become a slut who was so happy to be pampered by the opposite sex for the first time in college that she was willing to get laid! I was shocked when my older sister asked me if I wanted to have a threesome with her! I had always wanted to fuck my sister so badly that I decided to join in. On the day of the threesome, my sister was so surprised that she tried to run away, but I caught her and we had a threesome with my senpai!