Ah....ah....ah....ah!"His thrusts became slower, but sharper as the pleasure subsided. Lifting his hips forward, he dangled his softening cock to her ...mouth, letting her lick and suckle him clean.He was too close now; gripping his girl's hair, he tilted her head back and forced his cock all the way down her throat in one hard thrust. Holding her steady between his hands, he fucked in and out of her throat, pushing further, forcing a tiny gag, but she swallowed and he thrust, his cock a hard. I don't know how long my son, I'll call him Mark here, was by the pool watching me but when he said, "You look so comfortable and sexy mom."I about jumped off the float mattress in the pool. I asked him how long he had been there watching me and he just said long enough. He said he wasn't doing anything so he thought he stop in to see us both. I told him his dad had gone fishing that morning with friends and probably wouldn't be back till late that afternoon or evening, but he was welcome to. "Of course I won't peep. I promise. I'm your friend. I promise I'll stay at the top of the hill and keep guard and that I won't budge from that spot."Of course, she'd known that I was lying and that I'd renege from the moment the words left my mouth. She knew that I was insincere and that this was a promise born to be broken, but it allowed her the luxury of pretence. That was her fix. She went down to the lake and she stood at the edge and she teased me in a way that was deliberately. Her lips slid up and down my cock, nearly reaching the root on every suck. My hand moved from her shoulder to the back of her head, and my fingers entwined in her hair.Much to my delight, her other hand found its way between her legs. I could just see her playing with her pussy around her big tits. I could hear a faint jangling from the necklace around her neck and a matching bracelet on the wrist of the hand working her clit.A couple of sucks later, my cock vanished entirely in her hot.