Cougar Mother in Law

I'm Brian 28 married to Patrica 26 we met at university and married on my finishing university and starting my new career in engineering. Patrica got pregnant soon after our marriage and had our son Alexander after my late father. She was 7 months pregnant when she graduated from university and she waited several months after the birth of Alexander before starting her career as a lawyer in her father's John firm. We lived in the same suburb as her parents and Catherine 58 Patrica's mother was always visiting us. Then Patrica got a case in my home town and took Alexander with her and stayed with my mother Joanne who would look after him while Patrica was in court and I had remained to finish a project. I was working from home a great deal on that project and The day after Patrica and Alexander had left, Catherine came over to visit, John was away on another case in the next state. Catherine told me that she was lonely and just wanted company and she would get in the way of my work. She made me lunch and an afternoon snack and also started to cook our dinner after that was done and she had to wait for it to be ready. She came into my office and sat opposite in an armchair, she started reading a book. I was busy finishing up work and intended to stop after that for the day. When I finished I looked up and towards Catherine and she was sitting with her legs apart and I could see her black lace panties. I looked away and got up out of my chair and walked out of the office. Catherine asked if I wanted anything and I replied I'm just stretching my legs. I walked into the backyard and then sat down on the patio, a short time later Catherine came out and joined me there. We talked a bit and then she went to check on our dinner. We had wine with dinner and I help her clean up after dinner was finished and then we sat talking again drinking more wine. Catherine noticed it was raining and asked would I mind her staying the night. I said she was most welcome to stay and we finished the second bottle of wine and I went to shower. I was showering and the shower door opened and Catherine totally naked joined me in the shower. I was totally stunned and then she started to play with cock and then going down on me. I knew it was wrong for my mother in law to be sucking my cock, but she knew what she was doing and was enjoying it a great deal. She then got and with her arms around my neck and getting me to mount her. I fucked her in the shower and she stayed the night with me. That was the start of her coming over to me for sex and every time Patrica was busy or away I knew Catherine would visit and want to fuck. She even came over when Patrica was pregnant again and when Patrica had a nap. Catherine wanted sex from me.