Me and my wife were going away on vacation for a couple of weeks and her mother offered to watch our house while we were away. I have security cameras on the outside of our house and was surprised to see what they captured while we were away. Her mother was out in our backyard and on most occasions she was laying out in the sun wearing nothing. It was the first time I had seen her naked. I never mentioned this to anyone because I didn't know how my wife or her mother would take me see her naked. I had also put some cameras in the house which my wife didn't know about. I caught some very interesting stuff that I never expected. Her mother was going through some of our things and looking at some personal things. She found one thing which was a binder we had hidden of some very private pictures of us while on some vacations. We were naked and sometimes doing some naughty things in them and her mother was now viewing them. I guess Karma came back to haunt us. I saw her naked and she was now seeing me. Later I see her sit down to watch a couple of movies. The second movie was a porno and she was really into it. She actually undressed and was naked on the couch. As the movie went on she left the room and came back with a towel. She put a towel on the couch to sit down on and then began to please herself. She was spread eagle masturbating and I had it recorded. I guess my mother in law and me had seen each other in some interesting action but we never let the other know. My wife knew nothing about any of this and I was not going to tell her anything. My mother in law seemed to smile a little more than usual with me the next few times we met probably because she saw our naughty naked pictures but she didn't know I saw and have a video of her doing some self sexual satisfaction.