Mom Moves In

After dad passed away, the family decided that mom(she is 73) should live with me and my wife and kids. No problem I thought just another person in the house won't affect much around here WRONG... My wife is a nurse and works nights, night time is my time to get on the net and surf for porn like any red blooded male right.. One night around 12:00am I was looking over some good pics of young ladies, big curvy bodies, hanging tits and hairy pussys mmmmmm. Getting into it, ie hard cock and naked sitting back on my computer chair oblivious to anything but the computer screen, I heard from my left my mother saying "oh my Peter I'm sorry, I heard you in here but didn't think you were doing that. I'm going to make some tea care for some?" "Ah sure" is all what came out of my mouth. I gathered thoughts and my clothes well just a bathrobe but still with a hard on and went into the kitchen to see what was going on and what I would be in for since mom was a very religious person. She told me while we were having tea, that it has been awhile since she has seen anything like that,and she apologized again for interrupting me in my personal time. Idle chit chat went on for about 5 minutes then she asked out of the blue why do I play with myself when you have a wife? I have always been honest with mom and told her I just love to do it even though my wife and I have a very active sex life. Further questions like how often, when did you start, how did you learn, all lead me to have a very big erection in my bathrobe. Once I am erect I just cant seem to keep my hand off it and started a slow stroke across the table from my mother. This didn't go unnoticed by mom either and she said " are you playing with yourself now?" Again I don't lie and told her I was, and said the conversation was doing it to me and then we both laughed a little. We both finished our tea and she wanted another cup and asked me to get up and get it. I looked at her and she smiled and told me to get going. I stood up and my hard cock was poking straight out thru the robe. As I was walking over to where the teapot was I let my robe untie so that I would be free to be seen. I brought the pot back and started to pour into moms cup and my cock brushed her shoulder(she was wearing a satin nightdress) which made her turn her head and was about 3 inches away from my very hard cock. What mom did next was so out of character for her. She reached up in my robe and started to touch my cock and balls. At first thought I was to pull away but second thought made me stay. Mom was actually starting to rub my cock and balls and it was feeling pretty good. Well pretty good started to feel great and the feeling started to well up in my balls and I erupted into moms hand with 2 or 3 white ropes of cum landing on her pink satin nightdress. I had looked down and mom was not covered in but had a huge amount of my cum on her nightdress where her nipples were and even some sliding down her neck. I felt guilty as shit after what happened but mom put me to ease by saying "Now isn't that better than doing it yourself?" Mom has been with us for the last year. She is great with the kids and does alot of cooking for us as well. She always enjoys when my wife has to work nights. We have done similar things since and she has shown me her body but that's for next time.