Caught masturbating by his mum

I was 21 years old and I slept over my friend’s house over the weekend. Early the next morning my friend Mike and his father went to get their car repaired and I stayed in bed. My friend’s mother knocked on the bedroom door and asked if I wanted breakfast or if I wanted to wait for Mike to get home. I said I would wait and she said ok, how about you take a shower and get ready. They should be home in an hour. I said ok and she said she would get me a fresh both towel. The guestroom I was in had a full bath and I went in and started to get myself ready for the day. Since the bedroom door was closed I left the bathroom door open so the bathroom mirror would not get fogged up from the steam of the shower. The shower had a clear glass door and the bathroom had a big mirror on the opposite wall above the sink. I got in the shower and started to get soaped up. I had forgot that my friend’s mother said she would get me a towel but I remembered when I saw her reflection in the mirror outside the door holding a towel. At first I was not sure if she was going to walk in one me so I turned away so my back was facing the shower door. Then I wondered if she could see me in the mirror. I turned around and she was still standing outside the door holding the towel with a big smile on her face. I knew she could see me in the mirror and I was wondering if she was going to leave the towel and go or if she wanted to watch me. I soaped up my chest and looked over at the mirror and she was still watching me. She did not know I could see her and I guess she liked watching me take a shower. I thought it would be fun to give her a show if that was what she was looking for. I slowly started to soap the rest of my body working my way down to my cock. When I started to soap up my cock it got erect fast since I knew I was being watched. I looked in the mirror and my friend’s mother was still there but now her face changed to a curious look. I soaped up my butt and started to wash my cock. It was so hard now and I could feel it throbbing. I slowly started to masturbate and closed my eyes but I was facing the mirror. When I opened up my eyes I saw my friends mother with a shocked look on her face and her hand over her mouth. She must have been surprised that I was masturbating in her shower. I closed my eyes again and started to masturbate faster and harder. When I was just about ready to cum I opened up my eyes again and my friend’s mom was watching with her eyes in the mirror looking right down at my cock, with a hand on her breast and biting her lip. I shot my load and some of my cum hit the glass door and was dripping down, I milked every drop for her to see. I turned around and let the water rinse off my body. When I turned around again my friend’s mom was gone and the towel was on the floor outside the bathroom. When I dried off and went into the bedroom the door was closed. I got dressed and went into the kitchen where my friend’s mom was. She was talking to me but would not look at me for the first few minutes I was in the kitchen. She told me that she left me the towel on the floor when I was in the shower but since I left the door open she just tossed it from the bedroom door. I guess she did not want me to think that she saw me. After a while she seemed to become more relaxed and asked me how my shower was. I said it was ok and she said that’s good. Just then my friend and his dad were home and we all had breakfast together. Since that day every time I saw my friend’s mom she was very friendly to me and asked when I was going to sleep over again. I stayed at least once a month for the next 4 years and we continued teasing each other with glimpses of our sticky messes. Her favourite was to watch me on her sofa with my loose shorts and no underwear, she loved the way I would discretely milk it as we all watched tv.