Mutual masturbation

This happened only 2 weeks ago. My wife Bec went to work on her day off because one of the staff rang in sick. I was home alone with nothing to do. I was a bit horny so I went into the office and started watching porn. As I got into it I stripped off and started jerking. The phone rang and it was Kerry a friend of Bec's. We chatted for a while and she asked to talk to Bec. I told her she had to go to work and I was home alone. She told me she was home alone and asked if I wanted some company a bit later and I told her if she wanted. As I was talking to her I was watching a porn movie and jerking at the same time. It was not long after I had hung up and the door bell rang. I put my shorts on and answered the door. To my surprise it was Kerry. She told me her appointment was cancelled so she came over. We went into the back room and gave her a cold drink and chatted for a while. I told her I had to turn the computer off and would not be a minute. I did not notice that Kerry followed me to the office and when I got the screen up she said what are you watching. I was shocked and stuttered a bit and told her some porn. Kerry came in the office over to the screen and stopped me from turning it off. She then told me she had never seen and and to leave it on. It was just about to finish and when it did she asked if there was any more the same. I started another movie which was mutual masturbation with a husband and wife. Kerry moved a chair over next to me and sat down. As we were watching she told me Ron - her husband would never watch anything like this. This was the 1st time she had ever seen anything like this. As we watched we said nothing but I noticed Kerry licking her lips and her eyes glued to the screen. I was so turned on I started to rub my cock over my shorts and I worked up the nerve to put my right hand on Kerry's leg just above her knee. She did not move. As I was rubbing my cock I started to move my hand up her leg on top of her dress. I reached to top of her leg and stopped. Kerry's eyes were glued to the screen. I moved my hand back down and stopped at her knee. I reached into my shorts and pulled my cock out and it felt so good. I got a bit gamer and slipped my hand under her dress onto her bare leg. I was trembling a bit and decided to go for it. I started to move my hand up her leg and Kerry did not move. As I got closer to the top of her leg I was getting so horny. I stopped as I felt her undies. I stopped and wondered how far she would let me go. I mover my little finger over and let it touch her pussy and as I did she jumped and asked what I was doing. She looked over and saw I had my cock out and jerking it. As she settled down I let my finger go back to her pussy. I felt her undies and they were wet. I pushed a bit firmer and she did not stop me. I moved my little finger under her undies and found her clit. I played with her for a bit and then removed my hand. I stood up and dropped my shorts and showed her my hardon. 7 1/2 inches. As I was jerking it I asked her to strip naked with me. She looked at me and then told me the only person to see her naked was her husband Ron, and he is not as big. As I jerked my cock I asked her again to be naked with me and she slowly stood up and removed her cloths. When she had I told her to sit back down, open her legs and play with her pussy. She looked me in the eyes, opened her legs and fingered herself. It did not take long before Kerry started to cum, When she did she told me she wanted to see me cum so I jerked harder and was not long before I shot my cum all over her tits. After I cum Kerry moved forward and sucked my cock. She stood up and we cuddled for a while. She thanked me and told me she had never done anything like that in the 26 years she had been married and I was the only guy she had ever done anything with. We went back into the back room, Had a drink and sat on the lounge opposite each other. After a while Kerry asked if we could do it again so we both opened our legs and she fingered herself and I started jerking off. It was not long and Kerry was getting into it, I was so turned on I got up and went over In front of her and dropped to my knees. Kerry opened her eyes and smiled. It was not long before she said she was getting really horny. I thought I would try my luck some more so I moved forward a bit closer. I touched her hand with my cock and she looked down. I moved forward a bit more and this time my cock touched her pussy. Kerry stopped fingering herself, Looked into my eyes, smiled and took hold of my cock and pulled it into her pussy. All of a sudden we were fucking hard, Kerry cum and it did not take long before she and I cum . I laid on top of her for a bit and then pulled my cock out and got up. Kerry thanked me and told me it was a one and only time, she got dressed and left. Everytime i see her it is like it never happened.