I always walk around naked at home but anytime my mother-in-law would come over I would always get dressed. A couple of months ago my wife asked me why I always covered up when her mother came over. I told her it would be inappropriate to be naked in front of her mother. My wife told me she had mentioned it to her and her mother said she wouldn't mind if I was naked around her. I asked my wife how she would feel about her mother seeing me naked. My wife said she didn't mind as long as I was fine with it. The next time her mother came over I remained naked. Me and her mother were both awkward with it at first but soon it was no big deal. One time my wife was out and her mother came over and let herself in with the key she had to our house. There I stood with not only her looking at me but one of her female friends. Her friend took a quick look and covered her eyes apologizing seeing me this way. My mother-in-law said I was always naked like this when she comes over now and that I don't mind her seeing me this way. I wasn't expecting one of her friends seeing me naked but it happened and figured what was the big deal and told her friend I had no problem them seeing me this way. I had to use the washroom and I could hear them talking in the kitchen. Her friend told her she was telling truth she said I walk around her naked. My mother-in-law said that she knew I wouldn't mind her seeing me nude as well. Her friend said seeing my cock in person was a very nice surprise. Her friend said all she did was show pictures of her son-in-law on a nude beach but seeing the real thing in person was much better. I was hearing this and I now found out my Mother-in-law brought her friend over just to show me off. I then began to hear them talk more and her friend asked if she had ever she me with a erection and my mother-in-law said not yet but she figures it may happen at some point. I flushed the toilet and joined them in the kitchen. I was sitting with them having a coffee and knew what they were talking about earlier I was going to make happen and show them. I started to think about things that began to get me aroused. I stood up and got us some cookies and they noticed me semi erect. I talked with them a little longer and now I was very hard. I stood up and asked if they wanted more coffee. Their eyes were focused below my waist and I just stood there making no effort to cover up or hide it. I put more coffee on and it was a turn on having them see me this way which caused me to get even harder to the point I was as hard as I could get. They looked but made no mention of what they were seeing and looking at. I left the kitchen and heard them talking about my cock. Before I came back into the kitchen I fluffed myself up and sat down. It was her friend that made first mention of my erection. I told her it was natural and I can't really help it so why hide it. My mother-in-law quickly mentioned I was right and these things happen. There I was still sitting with them and with an erection. They stayed a little longer before they left and on their way out it was her friend who said thanks for the coffee and being comfortable enough to left her see me naked and also be on display in all full size.