Life on my new 40-year-old ketch was everything I could have dreamed of, but the charter business was busy, and I was looking forward to a well-earned break. Nat and I had shared a cabin in the forepeak for most of the season with a constant flow of paying customers. Sharing a cabin and shower (known as a head), we often walked in on each other in varying states of undress. In addition, the hot nights still resulted in sleeping with minimal clothes and no bedcovers. We even went for a swim off the yacht between charters, and while I was naked, Nat wore a bikini bottom. So, as we worked and played and virtually slept together, Nat was a good friend’s daughter, and I was glad nothing sexual or romantic happened.

The last charter for the season was coming up, and the weather was very hot and unpredictable as the storm season was on us. As I watched the two couples approach, I knew they were swingers, and I said to Nat, watch this lot; you might learn a few things on this trip. We went through the normal procedure of helping them settle in, a safety drill and a drink as we set out of the marina. They were in their mid-thirties, in great shape, and very comfortable in each other’s company.

Out of the marina, Nat and I raised and set the sails for the islands, which were about a four-hour sail away. As soon as we cleared the marina, our guests removed their bikini tops, and I could not help but admire the very natural and shapely breasts before me. As the yacht settled in, we heeled over a little, the bow pitching through the waves. The feeling of wind power and a yacht pulling through the water is very exciting. I was standing at the helm, watching the sails and feeling the deck pitch and roll, when one of the ladies asked if she could have a turn at the helm. Her hand was on my shoulder, steadying herself and standing close as her breast brushed my arm. As I turned to talk, I was looking straight into her beautiful brown eyes. Looking down at her mouth, she smiled, and I thought she was going to kiss me.

I looked up, and Nat shot me a knowing look; she knew I was in trouble, and so did I. I stood to one side, helped her take the helm and placed my hand on her back until she had her balance. Her skin was warm and smooth under my palm, but she seemed to struggle with the helm. So I placed my hand on her back and the other on the helm to help her. She commented that my hand was big and strong. As I looked down at the boat’s speed indicator, I had to look over her breasts and erect nipples. Her firm C-cup breasts riggled and bounced with the movement of the yacht. After a few minutes, she thanked me for the fun, kissed me on the cheek and returned to her friends.

Arriving at the anchorage, Nat and I organised dinner, and we sat with the guests in the cockpit, eating dinner and enjoying the wine. The guys were dressed in shorts and were pretty fit—the girls in their bikini bottoms and loose shirts with one button containing their breasts. Nat and I were in white shorts and buttoned shirts. Nat sat next to one of the guys, and I could see he was trying to flirt with her. Nat was one of those young women who was not into flirting and could be sarcastic, so I was confident this was not going anywhere.

We cleaned up and bid our guests good night, and headed for the shower and our bunks, leaving the guests to enjoy the first night on the yacht alone. We had been in bed for about an hour or more; I was sleeping in short, and Nat was in her knickers. When she leaned over her bunk to talk to me, I admired her firm breasts and small pink nipples; she still had suntan lines that extenuated the shape of her breast. Nat had also grown confident in the yacht and what needed to be done. So I suggested that she walk around before we turn the lights off.

As she jumped down from her bunk, she was standing next to me. Her knickers did little to cover the trimmed pubs, and I swear I could smell the musty aroma of her pussy. I lay there for ages, waiting for her to return, and I was just about to go and check on her when she appeared next to me. She looked confused, and I asked if everything was alright. Nat explained that while checking around the deck and passing the rear cabin, she could see into the top hatch of the cabin. There, one of the women was kneeling over one guy, and another guy was behind her, kneeling on the bed. From the moans and movements, Nat could see they were both fucking her; the other woman was kissing her and caressing her breasts.