When I was 15 I was taking a shower and when I was drying off I heard my 12 year old sister and girl cousins outside the bathroom window giggling. I realized they were looking in at me. This made me get really hard and i let them watch me get hard. They came into the house and picked the lock and pushed the bathroom door open. Then they took turns walking by the bathroom and looking in and giggling. I was standing at the sink with my hard on sticking straight out. I heard them in her bedroom giggling so when I finished I walked down to her room naked and found the three of them sitting on the edge of the bed waiting for me. I walked in and sat down in front of them and let them watch me play with myself. I ended up jacking off in front of them. They all giggled and watched and talked to each other about what they were seeing. This turned me on even more. After that first time, I started going naked around my sister and cousins every chance I got and they seemed to really enjoy it. Has this happened to others? I'd like to know and hear from others with this experience male or female. Is this normal?