It all started when my step sister was 16 she was still living at home with our parents, i am 7 years older than my step sister and just moved into my...new place, I was one Sunday afternoon and went to my parents to visit (well to get a Sunday dinner lol)I still had a key to my parents’ house, i let myself in and called out hello but there was no answer, as i was walking up the stairs i could hear light moaning noise, i got to the top of the stairs and my step sisters door was slightly open. Well in store ahead was a weekend of great weather and I was horny as always. I went to a hiking trail that I began to frequent after this day. One which I still stroke to, and gets me horny like fucking mad. Again this day I was wearing shorts and a tank top and walking boots. As I said before I had every intention to take some time to cum while on this hike. If I had an opportunity for an audience even better. This hiking trail was great I had great egress if needed to leave quickly. Here in. I had no idea what people called this outfit. I quickly adjusted the shelf bra so that if she pushed her chest out the least little bit, you could see her tits and nipples. When she leaned forward, the top fell forward, too, exposing her bare tits for all to see. The built-in shorts, Terry told me, were designed to be loose around the legs for wearing leggings or tights. She wasn’t going to wear any panties. It would let her appear modestly covered up, but twisting the right way or scooting. " I knew she was right. At this altitude, the temperature would drop to the teens by midnight, and we were both experienced enough to know how to survive. I quickly slid my undies off and tossed them in the pile with our other clothes. She unzipped the bag and in the little light that was available, I saw her full tits with their hard nipples starring back at me. She slid over as much as she could, but it was only built for one person. As I slid into the bag, I had my behind to her. The last.