One Saturday afternoon I came home from the gym to find my wife and her sister tanning on the back deck. They were both topless although my sister in law was laying on her stomach so I couldnt see anything. Although I had seen her and one other of my wifes sisters naked before skinny dipping. Nudity was normal around my house before the kids so I jumped in the Hot tub nude. My sister in law joined me but put her top on first. My wife said she needed to start dinner and went inside. My sister in law was telling me about how she was almost finished with her massage theorpy school and was wondering if she could practice on me. I got out got a towel and Checked it out with my wife. She said ok and I layed down with a towel covering me on the hot tub top. After she was finished with my back and I flipped over. she was kneeling at my head massaging my shoulders then moved down to my chest and stomach. At this point her breasts were right above my face. My wife came out and saw my very erect penis through the towel and yanked it off. I tryed to cover up as they both laughed but it was not working. My wife told me to relax and let her finish, and told my sister to feel free and take care of that so she didnt have to later! I could not beleive my ears! She grabbed my cock and started stroking it. After a few minutes she started sucking it and I managed to get her top off. All of the sudden we heard someone say Oh my...her mouth came of my cock and I came right then. My wife laughed histarically, and my mother in law had never been so shocked. This was only the begining of the fun with my wifes friends and family.