Standard disclaimers.
This is a story about sexual exploration and, open relationships. Open relationships can and do happily exist; but they are not for everyone. If you do not believe it is at all possible for open relationships to exist without damage to any and all involved parties, please do yourself a favor and don't waste your time reading this.
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Also, this story takes place in a world where STDs don't exist and only babies planned for and wanted do—in other words, a fantasy world. Any resemblance to real-life people is purely coincidental.
*****
"Ow-ow—urghhh, right there."
Natalie, astride her sister-in-law's back, smiled. "Too much?" she asked, her thumb working into the sore muscle under the shoulder blade.
"No, that's fine. It feels better already, thank you," Gwen groaned, relaxing to the feel of firm yet feminine hands massaging her back. She had casually mentioned the pulled muscle while the two women were lounging in the pool after their ride; Natalie quickly sprang into action, insisting they go down to the house and "let her see if she could work out the kink." She smiled. It was not too long ago she would not have even considered taking her shirt off in front of another person yet now she had agreed to lay naked beneath her equally-naked sister-in-law without a second thought, welcoming her baby-oil slicked hands as they kneaded and caressed.
"Did you get your check from Cho?"
Gwen nodded. "Mm hmm." The Lady had scoffed at their loss of decency and dignity for a relatively small amount, but the Slut had declared the experience priceless.
The woman on her back smiled. "Did you get anything else from her?"
"A gift certificate. For a Custom Cock, whatever that is."
"I got one of those too, the first time I modeled."
"So what is it, exactly?"
Natalie laughed. "The latest in technology. The dick of your choice, turned into a dildo by 3D printer. They do a laser scan of your chosen subject, then it gets printed out. Incredibly life-like, right down to the color."
"So you had one made? Of Adam?"
"Of course! He was a good sport about it and I think he enjoyed showing off like that in front of the technician, but he definitely had some concerns about lasers and his favorite body part."
Natalie continued to work the shoulder blade while pushing oil further down the back towards where her spread sex rested on Gwen's tailbone. "So, another night out with Mr. and Mrs. Handjob tomorrow?"
Gwen smiled but didn't open her eyes. "The McCallums, yes. They invited us to dinner at Café Twenty-One."
"It sounds like you're not looking forward to it?"
"It's not that, they're very nice people, it's just that I know I'm not the best dinner company. I've never been much for making small talk, and I'm worse at making friends."
"Practice makes perfect. And once you decided to get rid of that stick up your ass, you've done pretty good with the whole friend thing." Natalie lifted herself up and moved down, forcing her knee between Gwen's legs to straddle a thigh. "Let's check the glutes." Squirts of oil landed on bare buttocks. "What an ass," she said with admiration. "Smooth and rock-hard!"
"Yours is nicer," Gwen said with a blush, deflecting the compliment. "Yours is what a woman's should be like. Mine looks like a boy's."
Natalie snorted. "I've got a little more junk in the trunk, but your trunk is packed better." Another dollop of oil, this time in the opening of the valley between her cheeks. A finger quickly pushed it down between the tight globes, down over Gwen's anus, stopping just short of her other opening and her free leg reflexively twitched open wider in invitiation.
Natalie reversed course to gently rub oil around the crinkled muscle. Her finger centered itself, paused, then pushed. "Too much?"
Gwen eyes fluttered open as she tensed, then willed herself to relax and allow the invader in. "No, it's fine," she answered, feeling her ring grasp at the digit, caught between welcoming and repelling it. Natalie's palm swung down to allow her thumb might access to her sister-in-law's clit.
"Nope, no stick in there any more. Still death-grip tight, though. Tim ever have trouble getting it in?"
Gwen closed her eyes again. "We only did it that way the one time."
"Surprised he hasn't tried again, but he's a polite kinda guy. Probably waiting for another invitation," Natalie murmured, finger stroking and thumb circling. She had her sister-in-law's lower half twitching against the sensations created by both before she stopped and withdrew. "Turn over. Let me do your front."
Gwen was quick to roll over as soon as the body on her leg lifted out of the way. Natalie waited until the woman below her was settled before straddling her hips and squirting more oil on her pert breasts. She lowered herself, her mound pressing against the mons below it and began to work the oil in. She was gentle, no longer intent on finding sore muscles, casually caressing everywhere she could reach. Gradually her attention focused on her sister-in-law's slickened breasts, touching, then kneading. Gwen's nipples had been standing at attention even before the first touch, and anticipation made them almost painfully hard. Natalie obliged them, first gently, then with a more insistent rolling between oily fingers before being tweaked and pulled. Gwen looked up through half-closed eyes at the breasts above her as they jiggled and pressed together while their owner worked, and her hands had a mind of their own as they came up to return some of the attention she was being given.
Natalie smiled and sighed at the sensation of her tits being so delicately handled. Her hips rose a bit while her chest remained where they could still be fondled, and Gwen at first thought she meant to lie down next to her. Instead, the right leg came back, a knee hooking under her sister-in-law's thigh and forcing her open to lay her sex squarely on the one beneath. Satisfied, she leaned forward to where her breasts dangled over the waiting tongue below.
"Ohh, yessss," Natalie breathed, their mounds grinding against each other. "Nice, huh?" Gwen bit her lip, grimaced with pleasure and nodded, eyes still closed. The blonde supported herself with one hand while the other gently cradled the back of Gwen's head to bring her lips to the offered nipple. The warm tingling and small shocks spreading through her body overcame the fatigue in her arm, and she managed to hold her position until both women reached near-simultaneous orgasms.
"Mmm, very nice," Natalie repeated after she collapsed on to her side and regained her senses. "Your shoulder better?"
"Uh-huh," Gwen agreed, breathing heavily. "Everything's great."
***
Despite her worries, Gwen again found herself enjoying the McCallum's company the next evening. As before, Bob was both gregarious and oddly charming, Yvette a bit more reserved yet still able to make Gwen feel completely at ease. The food and conversation, complemented by the wine Bob had selected, was thoroughly enjoyable, and the Nelsons accepted their companions' invitation to join them for a sunset cruise and dinner on their boat some time soon.
The couples lingered in the parking lot after dinner saying their goodbyes, the men off to one side where Bob was busy telling a story about marlin fishing in the Keys while the women stood on the other side of the Nelsons' truck. Yvette glanced in her husband's direction before discretely motioning Gwen to a spot a few feet away. The blonde glanced back at the men one more time, assuring herself they had not been noticed, then put herself between them and Gwen. "Listen, I've been meaning to say...that day we met...on the beach? I really hope we didn't offend you. You looked really uncomfortable with the whole thing."
The Lady harrumphed at the apology. Too little, too late. Should have thought of that before putting on that lewd display! "It's alright," Gwen temporized. "I was just a little surprised, is all."
Yvette chuckled quietly. "I'd say surprised is putting it mildly. And then when Mr. Subtle went over to talk to you...we just figured since you were on that particular beach...well, that you wouldn't be surprised."
A look of confusion swept over Gwen's face. "I'm sorry, what is it about that beach? Do you mean because we weren't wearing bathing suits?"
Even in the dim light of the parking lot Yvette's blush was obvious. "Well, yes, but also, that beach is kind of known for, umm, more risqué behavior—not like the party cove, not that wild, but it's pretty well known as an adults-only beach, if you get what I mean. And since you two were dressed the way you were, we thought you were either there to see or be seen."
"Oh—oh, no I didn't know and neither did Tim, at least I don't think he knew," Gwen stammered, determined to get the truth on the way home. "I thought it was just a place where people came to, well, where they could get some sun."
"It's that," Yvette admitted, looking at the pavement, "but it's also a place where people can come and discretely, umm, be a little less inhibited. Bob likes to show off a little, and I guess I'm an enabler...again, I'm so sorry. You and Tim are really nice folks, Gwen, I—we—really didn't mean to offend you."
"I'm not offended, really."
"Are you sure you still want to come out on the boat with us? I promise we'll keep our clothes on and our hands above the table at all times," Yvette said with a smile.
Of course I still want to come. It sounds lovely. And you can dress however you want—I mean, Tim and I weren't wearing anything on the beach, either. We skinny-dip in our pool at home all the time, so it's no big deal!" Gwen said with forced bravado.
The blonde smiled. "Then it's a date."
***
"I never get tired of looking at you in that dress," Tim said as he kissed the back of his wife's neck after they had stepped into their bedroom. Gwen had questioned him on the way home about how much he knew about the beach, his eyebrows arching in surprise at the revelation they had been the audience for a show, but insisted the only thing he knew was that people were occasionally in their birthday suits there.
Gwen felt the hands on her waist move further down, gently grasping the hem of the little black number. The dress came up, and she raised her arms to assist in its removal. Tim dropped the garment and whistled. "Wow!" he exclaimed, a finger playfully pulling back the band of her thong to let it gently snap back against the small of her back, "wish I'd known you were practically nekkid under that thing!"