Once I broke through the tight ring, I never stopped until my body smacked into her cheeks. The scared silly, thirteen year old boy disappeared, like ... wild animal running on instincts, I took hold of both her hanging tits, and drove the length of my cock in and out of her ass. I groped at hand fulls of huge breasts, while slamming my dick into my neighbors hungry ass, as she thrust her ass backwards to meet my forward motion. With complete recklessness, I plowed her, and she slammed back with. There was still four hours to go. I knew my husband couldn't see how high my dress was or he would be looking at my legs. The TV block everything from his view. I felt my son shift his body around. When he did his dick ended up on the back of my ass. I kinda wished he would try something. "How you doing back there, son," I asked him."I'm Ok, mom, how are you feeling?" "I like what I'm feeling," I answered him. "Are your arms getting tired where you have them?" Yea, it's a little uncomfortable,". " OK Why don't you take off somewhere by yourselves and talk about it and your Mother and I will wait here at the camp for you both. Don't hurry - we'll expect you for lunch if we see you."We returned to our tent and set off with our towels, drink bottles and some fruit, we didn't bother with swimsuits as these were rapidly becoming excess baggage. When we reached a nice swimming hole down stream from our camp we spread our towels and lay down side-by-side to sunbathe and talk. We stripped off. ." He found her arm and put his hands on it the way you hold a baseball bat. He then twisted one in one direction, the other in the other -- what he had been raised to call an Indian sunburn."Ow," she said softly."Do you agree not to try to run away again or resist me?"She hesitated. He twisted his hands again, harder."Yes! I agree."He smiled, and as he lay on her, he slid a hand up between her legs to her crotch."Hey!" she said.He was momentarily embarrassed and removed his hand, but summoned.