When I was a teen my parents owned quite a large boat. It had two sleeping cabins, a galley, sitting room, head etc. My parents planned to go on an overnight cruise with one of dad's business partners and his wife up the Hudson River and later in the evening dock and go to dinner at a restaurant.
I was elected to be the "crew" on this particular trip. My responsibilities were to help my dad with the boat and help my mother prepare food for snacks and things like that. Not a whole lot to do, but the idea was to be helpful. This is something I always enjoyed doing. Even though I was now 18 I still enjoyed it. This trip turned out to be extra exciting.
The couple that went with us I've known for years and always had a bit of a crush on them, yes them, I go both ways!
The day was beautiful and everyone seemed to have enjoyed the leisurely cruising. The adults went to dinner and I stayed on the boat to keep an eye on it, plus I wasn't invited to dinner.
My parents had the one cabin and their friends had the other. I had the option to sleep in the galley area, wheelhouse or on deck. It was a beautiful night so I elected to sleep on the bow, on deck. I had my pillow and a sleeping bag and was set.
When they came back from dinner they had a good night cocktail and went to their cabins. There was a small hatch that opens in the overhead of the cabin and goes to the deck where I was sleeping. When the friends entered their cabin I could hear them talking because I was lying right near the hatch.
It was just small talk and I wasn't paying much attention. Then something changed in the rhythm of the conversation or more of a whisper, but I could tell something was different.
I couldn't tell what they were saying and I became more curious. I moved closer to the hatch and peeked in. She was standing and he was standing behind her and was touching her bare breasts. I pulled my head back to look around to make sure I wasn't being watched peeking.
When I got enough nerve back I peeked in again and she was out of sight, but he was lying on his back naked with an erection. God, that was so sexy. I felt like I was hit in the tummy. He looked as good as I thought he would.
I pulled back again took a deep breath and looked in again. She was back in view, naked, and was sitting next to him holding and stroking his cock; I was actually shaking while looking. I pulled back again and untied the draw string on my pants and started to touch my pussy. When I looked in again she was on her back and he was licking and kissing her pussy.
My eyes went from her breasts back to watching him between her legs. I was so hot. Then I looked from her pussy to her breasts, looked further up and I made eye contact with her!