I don't have a sister, but I have a cousin, a year older than I, who was, and still is, hot.
When I was 13, our families rented a cottage for a holiday.
In the evening we played board games in our bedrooms, and she wore very sexy baby doll negligie. I often saw her breasts, nipples, and hints of pubic hair.
I was thrilled, and thought of her often as I masturbated...
