Being widowed and the mother of two sons she was at a loss when my 12 year old brother asked her what wanking meant as he had heard it at school, She asked me to try and tell him as I was 18 and she new that I did wank as she had caught me in the bathroom once doing it though nothing was mentioned to save my embarrassment, one evening I told my brother to come and see me after he had a shower, he came into my room in fresh Pajama's, I said mom had mentioned that he was asking what wanking was and had asked me to explain what it was, I said it was a way boys and men relieved themselves, he still didn't know what I was talking about, so I asked him what he did when he got an erection, he thought it was when he needed to urinate, I then had to put him straight on that thought, I then proceeded to tell him what a wank was really, as I was telling him I was getting a huge erection so I decided to instruct him instead, lowering my shorts I pulled out my erection, as I am quite well endowed he was taken aback by my size, I was now seeing he was getting a stiffy so I pulled his pajama bottoms down to expose his impressive sized cock and balls although only sparsely haired, I told him to retract his foreskin just as I was doing as we are both uncut, he slowly pulled back his foreskin to his surprise a lovely helmet appeared it was evident he had never done this before, I slowly showed him what to do as he watched me, with the sensual atmosphere I new I wouldn't last long and suddenly I was shooting wads of cum all over my bed, he was obviously not expecting that to happen, after cleaning myself up I got him to the point of his climax he started to shudder and didn't know what a thrill he was about to experience, and all of a sudden he was there a mind blowing climax but very little ejaculate, I said he would be shooting as much as me in the near future, his lesson over we cleaned up together, promises ing we would do this all over again shortly.