A few years ago when my mother-in-law was on holiday with us, my wife said when I came in from the garden : ‘Did mom find you ? She was looking for you.’

    At that time, I was in the habit of slipping off to my shed, sometimes several times a day, to masturbate when the need seized me. I didn’t get undressed or anything. I’d just go in there and pull my cock out and relieve myself by cumming quickly.

    When my wife asked me the question, I was suddenly sure that Carol had seen me through the shed’s open door that morning while I was intent on masturbating. This certainty was in no way allayed when at lunch shortly afterwards, Carol showed no sign of anything unusual having happened.

    I should explain here that Carol had never liked me and did not hide it. Our relations were ostensibly polite for the sake of family peace but there was always an edge of slight contempt or condescension to anything she said to me.

    Of course, I’d been worried about what might happen next in the light of my wife’s question and my realisation of what it might entail. Carol’s bland naturalness at the lunch table wasn’t just a relief ; it triggered within me a sexual fantasy life with her at its center that has lasted for years to this day.

    Carol had never been beautiful or even particularly attractive. At the time this occurred she was 76 and 20 years older than me, white haired, a rather prominent nose in a longish face and a shapeless breasts and figure. As I said, we were polite together but I was always beware of her severity and frankness.

    Certain that she had caught me in what I thought was a private moment of masturbation made me feel put in her power in a way that I could not defend myself against it. And I discovered I loved it. Subjectively, Carol would have been the last person in the world I would have wanted to catch me masturbating. But I loved it that she had glimpsed the hidden me, the me I hid because it was shameful.

    I was already interested in granny porn which was not easy to find in those early internet days. I feasted on the big old breasts, the swollen pussies, the saggy flesh, the wrinkles and the stretchmarks while playing with myself. I was excited that these insouciant old women still wanted to exhibit themselves, fully nude and showing everything, to wankers like me.

    Carol, to whom until then I’d never given a moment’s sexual consideration, now became the focus of my granny obsession. When the holidays were over and she had gone to her own home, she began to feature increasingly in my masturbation. I don’t know if mother-in-law sex counts as incest but for the purposes of my fantasies, I decided that it did.

    (To be continued)