A few years ago i became aware of my 15yo foster boy peeping at me after showering. I was 49 then and i found it very arousing. Ashamed yes of course but through sexual frustration i began leaving the door open to make it easy for him. He was a shy kid and worshipped me so one day i asked him if he would like to dry my back. He came in hesitantly but i could see he was aroused. Obviously i was naked as he stood behind me with the towel. As he began one of his hands started feeling my hips which was a huge turn on. I then knew he wanted me to teach him which i also wanted. I then told him it was normal to be aroused and if he wanted he could get naked with me. Within a minute i was feeling a naked male against my bottom which i hadnt in years. I then simply turned to face him and threw my arms round him. He was a good size but his thickness was awesome. We fondled for a while and then i took him to bed. I taught him raw bareback sex and it was mindblowing for us both. Whenever we had the house to ourselves we would often go to bed and have good sex. Whenever he returned from junior college he would strip off with me and get into bed . He became more confident with me eventually and would turn me over and fuck me from behind. We shared the house with my two sisters so it wasnt always possible. Our sex lasted three years, it wasnt incestuous and fully consensual.