As a 49yo i began flashing to my 14yo adopted son. I did this when we were alone and when I was drying off after washing. I felt guilty but when I realized he was discreetly watching me I got aroused. I had a nice body so why not as we weren’t related. He was 15 when he approached me one day offering to dry my back,obviously an excuse but I said sure son. I could feel his erection through his shorts rubbing against my hips. I turned around and he saw me completely naked, I slipped down his shorts and out sprung his huge erection. We began fondling and then I suggested bed. I drew the blinds and we got into bed naked and I taught him s**. It was awesome having a 15yo boy f****** me and we slept together for a number of years. Nobody ever suspected anything and as a spinster I relished it.