"So I guess you and Nina should start fucking."

"What!?" I nearly spit out my beer. But Jack could see the gears spinning in my head as I tried to make it seem like a crazy idea, one I had never considered myself.

"She says she wants to."

We've been friends with Jack and Nina, to varying degrees, for around ten years now. My wife, Laurie, and Nina started working at a big tech company in New York City within about three months of each other. Soon afterward, we realized we lived only a couple of blocks apart in Brooklyn.

Our friendship ebbed and flowed over the years, but many of our friends—mutual and otherwise—moved away. Maybe because of that, we gradually grew closer. Then, when we both had kids about a year apart, we started seeing each other more often. Soon we were arranging playdates for the kids and taking weekend trips together.

I wasn't always attracted to Nina, which is surprising because she has a lot of characteristics that do it for me. She's tall and thin, with sharp, almost masculine facial features that I find really sexy. I think my love for Laurie blinded me to Nina's beauty during those early years. It's not that I don't love Laurie now; quite the contrary. We're an amazing couple, and having kids has only strengthened our bond and partnership. But I don't know what changed. Hitting forty and having sex with only one woman for so long are probably the main things. My sex drive hasn't waned as I've gotten older, but Laurie's has. As a result, I've found myself fantasizing more and more about other women in my life.

What's funny is that, while both couples have great chemistry and an easy dynamic after knowing each other for so long, Laurie and Jack are very similar, as are Nina and I. Laurie and Jack are Type-A, high-level engineering leaders at their respective tech companies—workaholics who are always complaining about their CEOs. Nina and I are alike in other ways: tall and athletic, good at our jobs but still able to make time for working out, reading good books, and listening to classical music. Oh, and apparently we also share an insatiable appetite for sex.

Jack and I had broached this topic before. Or at least the problem, not the potential solution.

One night when we were out for beers, I'd been complaining about our sex life and how much more I wanted than I could seem to make happen. I expected him to say he had the same problem because he had alluded to issues in bed before. Instead, he surprised me by admitting that the new antidepressants he was taking—which were working amazingly well otherwise—had zapped his libido and left him struggling to keep up with Nina.

But tonight, unexpectedly, he had a solution in mind.

"Better you than someone random. Or, worse, a coworker."

I didn't really know what to say.

"So what do you think?"

"I... I don't think Laurie would be okay with it, but..."

"She doesn't have to know."

"Are you guys sure...?"

And that was that. We talked logistics. Jack had a work trip the following week. I would tell Laurie I was going out to watch the Yankees game, then head to Jack and Nina's after the kids were asleep.

I was a nervous wreck all day, and the feeling still hadn't subsided when Nina answered the door.

We embraced and shared an awkward "I can't believe we're doing this" laugh with each other.

I had picked up a bottle of wine on my way over. I opened it and poured two glasses. It eased the nervousness a little, but I was still anxious when we finished our drinks and Nina took my hand and guided me downstairs to the spare bedroom.

We didn't kiss—was that against the rules?—but peeled off each other's clothes calmly and hurriedly at the same time. It was like unwrapping a gift we were eager to see inside while trying not to appear too zealous.

Even just getting to see Nina with her shirt off was exciting for me. She always dressed elegantly but never wore anything too revealing. Even the couple of times we went swimming with our kids she wore a conservative one-piece suit. My theory was that she was embarrassed by her lack of curves. She had the body of a long-distance runner—which she occasionally was—with long, lithe arms extending from sharp shoulders. But I thought her body was incredibly sexy. That was evident from the way my hard cock tented my briefs as she pulled down my jeans.

As she rubbed my cock through my briefs, I unclasped her bra, revealing her small A-cup tits.

I had fantasized about this happening for so long—not only seeing Nina's perfect, delicate body, but touching it, exploring it, entering it.

The sex that first night was okay, but not amazing. It was like sex on a first date: we were feeling each other out and figuring out what the other wanted. Despite the awkwardness, it was clear we both wanted it. Her pussy was dripping wet when my cock slid inside, and Nina commented several times on how hard I was.

It was over pretty quickly, though, and while I could sense that she had enjoyed it, I wasn't sure whether she wanted to do it again—or whether fucking a friend, a friend you weren't married to, was simply too strange.

But two mornings later, while I was working, Nina texted me: "I didn't get to taste your cock the other night. I want your cock in my mouth right now."

"Are you at home? When can I come over there?"

We live only a few blocks apart, and we were both working from home. An hour later, Nina was opening the door to let me in again. This time there was no messing around with wine. I followed her to the spare bedroom, where she pulled down my pants. My rock-hard cock sprang free, and she went to work on it. It was one of the best blowjobs I'd ever had. She took my seven-and-a-half-inch cock deep into her throat and expertly sucked my balls. Before I knew it, I was telling her I was going to come. She stroked me a few times, then took me deep into her mouth as I let loose into her throat.

"Holy fuck," I said. "I came so hard I almost blacked out."

"I love that I was able to make you come with my mouth. I can never make Jack come that way. Feeling and tasting your cum is a huge turn-on."

"You don't know how much I loved that. Laurie has never been able to make me come with her mouth. She thinks it's too small. And it kind of is, but she always gives up before I can get off. Do you have time for a little more? I want to taste your pussy."

She smiled and nodded. I crawled over and undressed her, sucked on her little tits, and rubbed her clit with my fingers until I found her soaked again. I slid down, licked around her clit, and fingered her. Within a couple of minutes, I felt her pussy clench and release as she came.

"Fuck, that felt good," she said. "And look at you; you're still hard as a rock."

It was true. I was standing beside the bed, hard again despite having come less than ten minutes earlier.

Nina slid to the edge of the bed and spread her legs. "Fuck me. I bet you can make me come again."

The bed was the perfect height for me to slide my cock inside her while standing. I started slowly, then picked up the pace.

"Fuck me harder," she said.

I grabbed her hips for leverage and started pounding her, the sound of our bodies slapping together growing louder as we fucked harder. I rubbed her clit with one hand and her nipple with the other, pushing her over the edge. I felt her pussy clench as she came around my cock.

"Fuck, that felt so good," she said. "I really needed my brains fucked out."

"Anytime," I said with a laugh. "I didn't realize how much of a nympho you were. I love it. I could fuck you all day long."

"I do really love it. I want you to come again though. You're still hard as a rock. Can't let that hard cock go to waste. Just give me a minute to recover and you can fuck me again."

"Yeah, I was close, but your pussy was so wet after you came that I couldn't quite get there."

Without missing a beat, she turned so that her head rested at the edge of the bed beneath my cock. She licked my balls and stroked me.

"I can taste myself on your balls," she said with a laugh.

After a few minutes, she turned around and spread her legs. "Here. Try again."

It felt amazing. Her pussy was still wet, but not as wet as before, and it gripped my cock perfectly.

I still needed a bit of help getting over the edge, having come only a few minutes earlier.

"Here—pinch the left one twice, then circle the right," I said. "That usually helps."

She reached out and tweaked my nipples as I fucked her harder.

She recognized the effect it was having and could tell I was close.

"Fill my pussy," she said. And that's what I did. She was a complete cum freak. After I pulled out she played with the cum in her cunt, licking it off her fingers while she smiled at me.

Over the next two days, before Jack returned, Nina and I met several more times. I had no idea how much, if anything, she told him. When I next saw Jack a couple of weeks later, his only allusion to it was that Nina had seemed happier and more relaxed than she had in a long time after his trip. He didn't thank me, but the way he said it sounded reluctantly grateful.

He also mentioned that they were planning to spend part of the summer at a house they had rented near the beach on the East End of Long Island. He invited us to join them for a week.

I told him we would love to join.

There was an awkward pause while we both considered what that might mean for our recent arrangement.

"It would probably make the trip more fun if I could somehow warm Laurie up to the idea of something happening," I said.

"Yes."

Knowing that Laurie was more open to talking about sex after a few drinks, I waited until a few nights later, when we had a babysitter and could go out for dinner.

On the walk home, I carefully broached the topic.

"I've had a couple of interesting conversations with Jack recently," I said. "About our sex life."

"Oh, really?"

"He asked whether you'd ever wanted to hook up with someone else and whether I'd be okay with it."

"What did you say?"

"That under the right circumstances, maybe."

"What circumstances?"

"That it couldn't be someone you had feelings for. And that it should be fair to both of us."

Laurie smiled nervously. "Did he have someone in mind?"

"He said Nina's been curious about trying something with another couple."

Her eyes widened. "Us?"

"Possibly. But only if everyone wanted it."

"So you and Nina…"

"Maybe. And you could have some fun with Jack."

"Maybe," she said. Then, after a moment, "Would it have to be Jack?"

"What do you mean?"

She hesitated. "What if I wanted to try something with Nina?"

I stared at her. "Nina?"

"I don't know." She laughed nervously. "I've never been with a woman before. But she's beautiful, and if we were all doing something together…"

"I honestly didn't expect you to say that."

"Neither did I." She leaned against me. "The whole idea makes me nervous. But maybe with Nina. And Jack too, possibly."

"So you're open to it?"

She took a breath. "Open. Not promising."

The following week, I filled Jack in on my conversation with Laurie.

"The bad news is that she seems really nervous about anything between Nina and me, or between you and her," I said. "The good news is that she seems open to having some fun with Nina."

"Not really what I expected!" Jack said. "But better than nothing. And I'm sure Nina is down."

As we drove to the summer house, our focus was mostly on keeping the kids in the back seat from melting down. But Laurie and I exchanged a few glances. She was clearly nervous, and I tried to reassure her by holding her hand and squeezing her leg.

The day itself was pretty typical. With the kids around, everyone was on their best behavior. But once they were asleep, Jack opened the wine, Nina poured drinks, and the mood loosened quickly.

We ended up playing Never Have I Ever in the living room.

"Never have I ever kissed another woman," Jack said.

Nina took a drink.

Laurie looked at her. "You have?"

"More than once."

"And?"

Nina smiled. "I liked it."

Laurie held her gaze. She looked nervous, but not embarrassed.

"I've never tried it," she said.

Nina shifted closer. "Do you want to?"

Laurie glanced at me, and I gave her a small nod.

Then she turned back to Nina. "Yeah. I do."

Nina barely had time to smile before Laurie leaned in and kissed her.

What started cautiously changed almost at once. Laurie touched Nina's face, then pulled her closer when Nina began to ease away. By the time they separated, both of them were breathing a little harder.

Laurie smiled. "Okay. I definitely liked that."

Nina stood and offered her hand.

"Come upstairs with me."

Laurie took it without hesitation.

She looked back at me only once as Nina led her out of the room. She was still nervous.

But she was smiling.

Jack and I drank more wine and waited to see what would happen. Eventually, we turned on the Yankees game, and before long Jack was asleep on the couch. Not long after that, I decided to go to bed, making enough noise as I passed the bedroom to announce where I was going.

And just as I crawled into bed, Laurie opened the door and crawled in on top of me.

"I had an amazing time," she said, her face flushed. "Nina wants to join me in here. Is that okay?"

I nodded. Laurie returned holding Nina's hand and led her into our room. The two women climbed into bed with me. Nina and I carefully avoided looking directly at each other.

I was immediately rock hard as the two women stripped down and climbed onto the bed. Laurie took me into her mouth while Nina positioned herself behind her and ate her pussy.

Not knowing what Laurie was comfortable with, I let them run the show. Soon, though, Nina joined Laurie at my cock, and Laurie didn't object. I was in heaven as Laurie sucked my balls while Nina took me deep into her throat.

Laurie's expression tightened slightly as she watched how expertly Nina handled me.

"Okay, I want you to fuck me now," Laurie said.

She slid to the edge of the bed. I followed, stood between her legs, and slid my cock inside her. Nina knelt beside Laurie, alternating between sucking her tits and making out with her. Nina's pussy was within reach, so I slid two fingers inside her while I fucked Laurie.

This was all too much.

"I'm going to come," I called out.

Nina turned toward me and pinched my left nipple twice, then circled the right with her thumb. My body reacted instantly, and I came deep inside Laurie.

I collapsed onto Laurie, and we came face-to-face. The pleasure had vanished from her expression.

"How does she know you like that?"