I gasped as one long finger reached the bottom of my pulsing slit, gently teasing the wetness that had been gathering there since we’d reached the s...ore. So slowly it should be criminal, I felt as your finger buried itself in my soaking hole and dragged the juices up, stopping right at my throbbing clit. You massaged the tiny button, teasing gently and ignoring my gasps to go harder. You’d been fantasizing about this for too long, and you wanted to make it last.Up and down, so very slowly, you. Sensing Rob’s fear Vince wanted to put him at ease. “Rob, I’ve got a proposition to discuss with you that will be to your great benefit. I won’t go into my reasons for it other than to say that they are pure without any intent to hurt anyone, just to make four people happy.” “OK,” Rob replied, a little more relaxed. “How would you and your buddies like to fuck Vicky?” Rob’s face got ashen, and after a few second delay he stammered out “Vince, I hope you don’t think that we’ve been hustling. Now just so you all know, I'm in the pool topless with only my string bikini bottom on that really doesn't cover much. At this time I was semicovered because I was on my stomach but Mark was still getting a pretty good view of the one side of me, my ass and pussy.We carried on with some small talk for awhile about what we both had been doing lately, just the normal mom/son stuff. While we talked Mark was sitting down on the edge of the deck with his feet hanging into the pool trying to cool off. I had a skirt on, but I had left my panties at home, so I my buttocks were naked under my skirt. The stranger’s cock felt big and very hard against my tight cheeks. First I thought he was rubbing himself against me, but soon I realized that he was simply dancing, but did nothing to hide his excitement. It was really turning me on to dance like this with that guy.After another song, I suddenly felt his hand come around my waist and then go between my legs. He managed to lift my skirt from behind.