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Reading CH1 is helpful for context and character building, but isn't necessary for the full enjoyment of this story.
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Previously:
During a mostly unscripted turn of events, Mark and his wife Karen turned a day trip to a secluded part of the lake into a drawn-out bout of teasing the group of college kids that happened upon them. It awakened an mostly unknown erotic response from her, and while she is scared to expose herself, she does it first for him, then also for her, leading to an explosive result.
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"You sent two naked men to get my wife?" he hissed, turning around and moving towards the shore as fast as the water would let him. Karen giving them a peek was one thing, he didn't want both of them naked around her, especially how she was dressed when he left her.
Before the water level reached his stomach, Amy's hand locked around his wrist, keeping him from following the naked men heading for his wife.
"Not so fast, Mark. Why don't you stay and keep me company for a minute? Dave and Peter are my boyfriends, so I know it's OK. They both just came inside of me, so they won't even be horny for another couple of minutes."
Mark stopped in shock and turned back to Amy, his face a mask of confusion.
"Um, they are your what? And they did what?"
"Yes, they are my boyfriends. You heard me right. You know exactly what I'm wearing right now, you were staring at my naked ass when I walked down here. And while you were busy making Karen squeal, they were both fucking me right where I stand. So calm down, like I said, they will be gentlemen with you wife, even if she is naked and passed out."
"I don't know what to say. This is absolutely crazy, Amy. You know that, right?"
She smiled widely at him. "Well of course it is, old man, but you should know that life is a lot more fun when you expand your horizons. Speaking of which, you should agree with that statement, and especially today of all times. I know about this game you're playing with Karen. How you're making her wear only a skimpy ripped dress, making her flash my boyfriends, and driving her crazy wanting cock. So yes, expanding your horizons, pushing boundaries, and living a little wildly sure is fun, isn't it?"
Hanging his head, Mark wasn't sure why he was suddenly embarrassed. His head was down, but he didn't close his eyes, and a second later he forgot about that emotion, another one was taking over. The movement of Amy's shirt was too much to ignore, and he was now busy staring at her breasts. The waves were a bit higher from a light breeze that had picked up, and now both breasts were entirely visible every time her shirt moved.
"Hello, Mark, up here dude."
"Oh sorry, I didn't mean to stare. But yes, today is turning out a lot more exciting than I had planned. We didn't even plan anything more than getting a tan and getting away from everything for a few hours, and now it's been one crazy spur of the moment decision after another."
"Actually Mark, most of the time I'm a bit offended when guys stare at my tits. Today though, I'm allowing it so we can all follow your plan. Well, yours and Karen's. Why not show off a little for someone you will probably never see again? Just some teasing won't hurt, right?"
"Um, yeah? I guess so?"
"Speaking of which, right now my boys are showing off a lot for your wife. I really wouldn't be surprised if she is doing some extra teasing herself. Was she dressed when you left her?"
"Not really... Her shoulders and stomach were about the only things I couldn't see, but I don't know how much she fixed after I left. If anything."
"Isn't that kind of backwards?" Amy laughed. "Well anyhow, maybe we can play along as well."
She dipped under water and Mark could see her blurry shape moving around with a mass of white from the only thing she was wearing. As Amy stood up face-first to push her hair out of her face, Mark's eyes opened wide to see her shirt was now gone. She walked past him to where the water level dropped a few inches, now stopping at mid-stomach instead of mid-chest. Without a glance at him, she tossed the balled-up shirt towards the big rock and Mark now saw a couple other lumps of cloth next to it. Her boyfriends' shorts.
After standing still for a moment to let Mark ogle her nakedness, Amy held his arm as she walked behind him. He tried to turn and watch her, but she held him still by wrapping her arms around his waist. All he could feel was her firm breasts pushing into him, then her nipples sliding softly across his skin as she relaxed her grip. His breath stuttered as she trailed her hands down his stomach and started pulled the string to untie his shorts. Assuming that he knew what what she was after, he grabbed her hands.
"No Amy, we can't do that. I'm married. Besides, they will be back in a second!"
"Don't get carried away, old man. I'm not after your dick, I've got enough of that to keep me happy. You've got to get rid of these shorts to match the rest of us, that's all."
He let her hands go and she continued, pulling apart the velcro fastener and pushing the shorts down. His heart fluttered as he felt her breasts slide slowly down his back, then across his bare ass cheeks. Amy stopped and stood back up.
"I've got a better idea, Mark. I don't want your ass in my face while I take these off. Turn around for me."
Confused, he turned slowly, feeling awkward as his shorts slid down to his knees in front of the naked young woman. The feeling of Amy's breasts pressing into him distracted him, and Mark hoped Amy wouldn't notice his cock pointing straight at her underwater. That thought didn't last long. As soon as he was facing her, she pulled herself against him again and his cock was now trapped between them.
"Really Mark? First you're trying to keep me away from your dick and now you're trying to stab my stomach with it? Tsk tsk, bad boy. But I won't tell. This time."
"OK good," he replied lightly. "We'll just keep it between us."
She laughed and playfully slapped his chest. "Not like that, you perv. You know what I mean. Now take a deep breath."
Before he could ask what she meant, Amy slid down his front quickly, her torso tight against his front, her hands tight against his back. Then her hands were tight against his backside, her hands firmly grasping his ass cheeks, and he groaned as he felt his cock being held tightly against her face. Mark swore he could actually feel her lips and nose pushing against the underside of his cock.
Then she was gone. Mark barely had time to take a quick breath as her hands wrapped around his ankles, closing his mouth a second before she up-ended him into the water. Mark's feet pointed to the sky as his back felt the slimy bottom of the lake. He now understood what she meant when he felt Amy yank his shorts off, then he was completely bare.
Disoriented and short on breath, he went spread-eagle to gain his bearings as he finally got hands and feet oriented on the lake floor. Quickly shooting up, he coughed while trying to pull in a huge lungfull of air. He stared at Amy in mock anger and shook his head.
"You're a bad bad girl Amy. That was mean."
"Don't tell me you didn't like it," she said coyly, taking a step towards him. She reached out and grabbed his rigid cock.
"Something tells me you liked all of that more than you want to admit."
"Really, Amy," he said softly, "we shouldn't be doing this."
"Doing what, this?" she whispered, slightly stroking his cock.
Mark made a half-hearted attempt to get her to stop, but she moved closer.
"Payback is fair," she whispered, "if you want to grab my boobs you can, I've seen the way you have been staring at them. You can touch, but only for a minute. Don't get carried away though, I know you're a pervert."
Mark mentally tried to stop himself, but he failed miserably. His hands had a mind of their own as they slowly reached for her chest. Pausing as his fingertips traced around the side of her breasts, he looked behind him but still didn't see the other three yet. Mark sighed in pleasure as he continued to move his hands, fully grasping both of Amy's breasts.
"Mmm, that feels good," she cooed, "just move back with me, I have an idea."
She leaned back and he had no choice but to follow, his cock was still firmly in her grasp. Amy stopped when the water reached her shoulders, then turned around, Mark's cock still firmly stuck in her hand. His hands slipped off of her breasts as she turned, but when she stopped and pressed her back into his chest, Mark reached around her to grab ahold again.
Amy stroked his cock slowly with one hand and massaged his balls with the other as she leaned her head back to put her cheek on Mark's neck. He looked down to watch himself squeezing her bare breasts, catching the occasional blurred glimpse of her pussy as she started to sway her hips. This made him feel the cleft of her ass cheeks hit his cock head, the feeling of slipping between her cheeks was impossible to ignore.