"Yeah, I was toasting. If you weren't on the dock when I got back I might have just jumped in then." Clothes and all?" she called."Oh probably not." I... called back."Oh...Skinny dipping then! Naughty!" Maybe. But now you'll never know." I answered."Awww too bad." She said as she slowed and put her feet down, finding the soft bottom in about four feet of water. She stood up, her tits just above the water level, and waited for me to catch up."If you were so keen on skinny dipping, why didn't you. I've also learned a bit about masturbation and we'll dealwith that problem first." Mary reached behind her chair and produced a small box. "This is achastity device called a CB3000. I bought it some time ago inanticipation of this moment. It's not the very latest model but it willdo for now. Go upstairs and put it on. There's a leaflet with someinstructions. Then present yourself for inspection."John was somewhat taken aback at this turn of events. He had vaguelyheard of such things but had. She was my adopted sister but that was the same thing as being my sister.All of my friends knew that we were adopted and the guys always told me that I should hook up with Leigha. They liked to tease me about Leigha and I taking baths together. They said that it's not i****t because we are not related by blood. The more they said it, as we got older, the more I thought about it . . . but it was just thoughts. I never actually did anything to even hint to Leigha that I thought she was. Elizabeth told me she still loves him very much but that she is still very interested in sex and can't imagine going without.It has already been 4 months.I tried to be a good friend talking and comforting her but my horny tendencies are pocking at me putting potentially bad ideas in my head.I really tried being a good friend but if she was going to have an affair with anyone it was going to be me.We were never really physical with each other so I had to find some way of changing that to.