“Babe,” she managed. Every breath was a gasp. “Remember this?” She turned away from him and pulled his hands around her neck.
“Sure mom.” When he was younger, his mom used to pull him around as she swam. The only problem now was that his arms would probably choke her if they went around her neck. She realized the problem and lifted her arms.
“Under,” she said. He wrapped his arms under hers, crossing them above her breasts. She could hardly hold back a moan as she felt his forearms across the top of her breasts. Then she began to swim, and John floated along behind her.
There was another difference between now and when John was younger. Now, as she become horizontal swimming in the water, her son’s crotch would bump into her ass every so often. John’s mom felt it and her eyes closed in pleasure. Her 18-year-old son had his arms across the top of her breasts, and his cock was bumping into her ass. She was in heaven as she swam. She went faster, and his arms began to slide down her breasts. He held on tighter, but because she was going so fast, he could not move his arms back above her breasts. They were now folded across her nipples, including the one that was exposed. Her faster speed also caused her to become more horizontal, which meant his cock pushed into her ass far more often. It was all his mom could do to not cum.
John found himself become aroused as well. He thought back to when his mom had been rubbing Sam, slicking her body with lotion. And he knew his forearms were pushed against his mom’s tits. He wanted to slide further up to avoid her nipples, but she was going too fast. If he released her he would be left behind. Then an erection began to grow between his legs. He realized the implications of that when his cock bumped into his mom’s ass. It was only slightly erect, so he hoped she had not noticed. He tried desperately to keep his cock from her ass, letting himself float more to the surface. But her ass rose too, and now his cock was not just bumping into it, but constantly pressing against it. He could rise no further, so he had no choice but to let his cock push into his mom’s bikinied bottom.
Beneath her son, John’s mom was fully aware of what was pressing against her ass. In fact, when he had floated up, she had purposefully reached her butt up as well. And now there was nothing he could do, he was trapped against her. She whimpered with each stroke of her arms, hoping her son would think them a product of her swimming effort. She felt his cock crowing harder, felt its length pushing between the cheeks of her ass. She felt his arms squeezing her breasts as well. It was too much to stand. She had an orgasm as she swam, pushing her ass up into her son’s cock, rotating her body from side to side with each stroke of her arms so that her breasts were rubbing against his arms and her ass was wiggling against his cock.
At that point, John was just too erect to remain on his mother any longer. He was extremely conscious of his cock pushing between her ass cheeks, and could not imagine how his mom did not feel that. Worried that she would, he released her. Truly he felt disgusted with himself, and again he tried to attribute the erection to what had happened between Sam and his mom. But Sam was way back on the beach. And he could not deny that the length of his cock inserted down the length of his mom’s ass crack had felt amazing.