We were the background vocals to Bob and Sheila’s passionate lead! Then I heard another voice enter our song and I saw Matt and Mary engaged in a re...erse cowgirl with Matt reaching around and gently tickling her clit. Soon the six of us were being ‘helped’ by our other lovers and our song turned into a symphony. Or cacophony, depending on your musical ear! Soon our ‘orchestra’ consisted of every adult on the yacht. Nobody was left out and gasps, screams and moans could be heard for miles, out. I was sitting in the chair wearig only a robeShe chatted and sipped as I looked her overLaura is barely 40, about 5'7", maybe 120 lobs, almost red hair and frecklesShe was wearing a sheer/thin dress and I could see her outline if she stood with the sun at her backAS I set my glass on the tray she moved closerI was pretty sure I could pull this offAS I straightened up from leaning over to drop off the glass I ran my hands up her legs, under her dressLaura gasped and fiegned resistance, she. There were only about 15 kids there, but that was a lot in our little house.I went in and went to my room to change.I barely got dressed when someone came to my door. One of my sisters friends opened the door and say "Hey!, Yous want a beeeer or somethin?"I said "Thanks, I'll get one in a minute".I went back in to the living room and spotted my sister and hanging on a guy with Jan next to her.My sister was wearing a pair of short shorts and a tank top.Jan was wearing a miniskirt with a tank. I did not say anything 2 minutes later.I thought I must see what others were doing in their rooms. I came outside but I was shocked to find that no one was in their room. I try to find them in every room but all were absent and I was highly amazed. I quickly get back to my room to wore clothes and found them as I turned lights on, it was another shock when I found them all sitting at chairs in my room in corner and they started laughing at me. I was not able to find what actually had happened..