I was at home having a shower when my mother in law walks in. We have a clear glass shower enclosure and there was no where for me to hide and nothing for me to cover myself with. She came in to use the toilet and with the layout of the bathroom the toilet faces the shower. She was watching me as I showered and I don't know if she knew it but I was getting a rather clear view of between her legs. She seemed to be taking forever so I just continued showering. I was finally done and stepped out to towel off. When I did she chatted to me like it was no big deal. I was naked in front of her and she was on the toilet with her legs spread and making no effort to hide her lady part. I figured it was too late to hide myself at this point so I just toweled myself in front of her. She was seeing all of me and I was seeing her lady part which was making me a little aroused and causing me to grow into a larger more erect state. We saw each other parts but never made any comments about it. We simply did a show and tell but without the tell part.