We were all from a small town near Seattle, so it wasn’t a long trip to the campsite, which was deep in the woods near a nice mountain stream. It wa... just a day trip, so we wouldn’t be spending the night.I was fifteen at the time and my younger sister, Mandy was fourteen. We were very close, and did everything together.We did the usual stuff; playing soccer, throwing a Frisbee around and frolicking in the stream.The troop leaders dug a fire pit. We all chipped in by gathering firewood. Then, we. They were to tour the domestic animal area on Saturday. The stallions had taken Ruth to uncharted places in her mind, but the dog section took her completely off world. Her old fantasy was there in front of her, in full and glorious Technicolor. It was as much as she could do, to not climb into the insemination cells and let the animals fuck her until she collapsed. Cindy and David, Cindy's guy, wondered off and left her talking to one of the assistants. He was quite informative and explained. Would she?"N-no, no, nothing like that. Just a back rub. Honest!" Oh, sure. I've heard about guys like you. Get a girl in a compromising position, get her all relaxed and then..."By this time I'd figured out she was just teasing me and I leered at her, "It's too late for you, my dear. I have you in my power now and NOTHING can save you from a fate worse than death!"Beth just giggled and said in a tremulous, little voice, "Please be gentle," as she stretched out on the couch.We both cracked up. That was when Shelly did one of the hottest things I have ever seen. She rose up off of my cock and turned around and got back on my cock facing me. She rode up and down on me a few times and then rose up just above my cock, and pushed out my cum from her sloppy pussy. I watched as my cum fell out of her and slide down my cock, coating my shaft and balls with a mixture of my cum and hers. Then she grabbed my cock and began to suck me again. I was still so sensitive that it made me jump, but.