When I finally looked back over to the front, I noticed that Tammy and Dave no longer had a seat belt on. Nothing else seemed unusual, though. Dave's ...ands were still around Tammy's waist, although she was now sitting up high on his lap and bouncing up and down. I thought the bouncing had to do with the bumpy ride, but when we stopped at a red light, Tammy kept bouncing. I couldn't see either of their faces, and suddenly I had the terrible suspicion that he was fucking her. I became even more. Once the kids were doused with sunscreen and went racing into the pool, I removed my cover-up then lied down on my stomach on one of the lounge chairs as I watched the kids frolic in the pool while I read. Jon came outside after awhile and joined us. I nervously looked at him knowing that he would find a way to grope me. “You look like you could use some sunscreen, you're starting to burn.” he said as his eyes lustfully scanned my body.“I’m OK; I just put….”He grabbed the bottle and. “Jimmy, why don’t you get your cock out and beat off too? She won’t be nude much longer and I know you want to do this.”Jimmy looked a little hesitant and pulled his cock out. It was about 5” long and hard as steal. He slowly stroked it. He was a bit embarrassed. He had never beat off in front of anyone, much less a nude goddess like Linda.Linda was ready to put her clothes on but knew they guys needed to get off first and it wouldn’t be right to leave them with a full load.“Jimmy, maybe. Upon his departure, Catie said that she wasn’t that uncomfortable with seeing my dad naked, it was more that he was naked in his only daughter’s bedroom. I said “Catie, there’s a lot more to what you have and haven’t seen, and as a matter of fact I rarely sleep in my own bed. The fact that my dad wanted to come into my bedroom is rare.” She looked extremely interested to listen to what I was about to say next. I continued with “My dad and I are involved sexually and have been for a while so if.