Short but sweet...Once when I was a teenager, my parents were out for the night. I was getting ready to fall asleep when my sister who is two years older than I am appeared in my doorway and flipped on the light. I think she was probably 17 and I was 15. I told her to go away unless she needed something. Instead she lifted up her nightgown and flashed me. I looked at her tits and her hairy pussy and immediately got hard. I sheepishly flipped open the blanket and pulled my boxers down so she could see my cock. She looked for a couple seconds and then disappeared. I rubbed one out, which hardly took any time at all. We never spoke about it again. She has mentioned to me one time (without referencing the incident) about how I have a really big cock. I don't have any kind of attraction to her sexual or otherwise, but to this day I think that at the time she had the most perfect tits that I have ever seen. .