This happened back when I was 13 years old. I had a porn magazine that my mom found and she wasn't too pleased. She said I shouldn't be looking at naked women at my age and told me if she ever found me doing so again I would be in big trouble. It was a few months later when she had a woman friend of hers staying with us for the week. The first morning after she arrived I came down for breakfast and there was this woman in the kitchen wearing absolutely nothing. I didn't know exactly what to do so when she told me to sit down and offered to make me something to eat I did. A few minutes later my mother walks in like she never had before. She was naked too. I had never seen her like that before and she acted like it was no big deal. Months earlier I was told never to look at naked women and now there she and her friend were. I was getting turned on seeing them walking around without concern I was seeing them. Even though she was my mother she had nice breasts as did her friend. Her friend had very little hair below and my mom had a lot more. They were talking about going out tanning but her friend said she needed to clean and tidy herself up first. My mom said she needed to as well. I went to do some other stuff and figured that was my excitement until tomorrow morning which I hoped would have them be the same way. They came down an hour later and there was something different about them. It wasn't that they were dressed, because they still weren't, but that they had no hair below now. They went out back and literally could have been seen by a couple of neighboring houses if someone from them looked this way. This was much better than the porn magazine I had. They were changing their positions regularly to tan evenly and one pose had both their legs open and themselves very exposed. I went out and sat with them and they didn't seem to mind. It was her friend that did something that clearly has stuck in my mind. She sat up, put lotion in her hand and she was rubbing it between her legs. Where I was sitting I had a very clear view of what she was doing. Then came the ultimate view for me. She stopped and pulled her lips apart checking herself out. I was intently watching and she caught me doing so. She just smiled and quickly stopped but not before I saw in real life what I saw in the magazine. My mom said the sun was getting to her and she had to go in and laydown for a while. Her friend said I would keep her company and invited me to tan with her instead of just sitting there. Her friend told me to get undressed. I wasn't expecting this and how my mom would react. When my mom told me to come inside to undress and get a towel to lay on I knew she was fine with it. I remember taking my clothes off and standing there in front of her naked. It was weird since I hadn't done that in years. My mom handed me a towel and told me to go out now. I was getting cold feet but I did it. Her friend asked me to put suntan lotion on her back which I did. She said I better get some on me too and proceeded to rub it on me. She was putting it everywhere except on my privates. I did my privates myself and gave myself a hard on which caused her to chuckle and told me it was normal for that to happen. She began to tell me she felt a little irritated below but not from the sun. Once again she pulls her lips open in plain view of me and begins looking at herself. She then asks me if I can see anything red or irritated. I was knowingly looking inside her open pussy now. It looked fine to me and told her so.

The rest of the week was pretty boring except for the mornings where they both did come down naked. My mom and her went out most days so I didn't see as much as I did that first day.
After she left my mom told me that her friend was a nudist and that her friend convinced her to give it a try. My mom said it was rather relaxing not wearing clothes. She said she liked it when I gave it a try that first day too and suggested we continue. We began to do it regularly and I am glad we did. I did ask her about the differences about the porn magazine and seeing them naked. She said the magazine exploits women but being a nudist is just people naked in a nonsexual way.