She parted her legs, thrilled that she was in this submissive position with her genitals open to Mike to do with as he wished.Mike grasped her hips st...ongly and thrust his penis into her vagina and pounded vigorously. In this position his penis penetrated even deeper and the pressure on her G spot was even greater. Their sex wasn't gentle. It was primeval, basic, unrestrained physicality. Sarah's role was to push herself backwards to get Mike deeper into her and to cry out loudly as her orgasm. I did not know what to do, I felt so embarrassed, I did not want to get hard while running the beach, I mean what would people think.... I ran way down past a resort, which I later saw a sign saying that it was a nudist resort. As I got to the end of the beach I stopped to stretch and to catch my breath, I was also hoping that I could get my cock to go down. but then I noticed her, she was just laying there under a tree on her towel with her legs wide open, I guess she was sun bathing her. She then used both hands to balance herself as she pushed down.Amy felt as if it were her own pussy being stretched by the wide cock as she watched the cockhead pop inside the girl's cunt. Amy watched the girl's reaction to the sensation. The girl's eyes closed. She rolled her head loosely on her neck as she forced herself down lower--and lower--on the prick. Amy was sure the girl would take no more than half of it.Amy was wrong.Her eyes bulging at the sight, her hand flying across her own. So he tickled her, on the side of her ribs. She couldn’t stop him, as she was unable to move her hands. But the tickling made her squirm around in an effort to avoid his invading fingertips. Her eyes were going round as saucers, and she let a high pitched moan escape from the back of her throat. I said “And now, your punishment! You shall be spanked!” I raised my hand as if to land a slap on her rump, and without hesitating she turned and stuck out her derriere.