Drunk Mother

I'm an only child and attending university and after the sudden death of my father last year my mother 52 went to pieces. Started drink heavily and as a result my grandparents both sets decided to get her help. A fulltime health assistant 47 was employed, with the brief to reduce my mother's drinking. My mother has other health problems as well, some medication she takes makes her sleepy, even more so when used with alcohol. Her health assistant (my grandparent's term for her) was fairly slender for her age and okay looking as well. So, it gets boring for her when my mother is asleep as she has to be close by. Usually in her room next door to my mother's bedroom. Meals provided and housework done by the housekeeper 59 and a maid 56. She has a baby monitor with her to alert her to my mother waking up as well as a motion detector to doubly sure. All bedrooms have their own Ensuites and mine is next to the assistant's room. My mother had a turn (as it's called not alcohol related) and was put into hospital for a few days to restabilize her. It was when I wasn't attending the university. Not able to go away (like my friend's had) because of my mother's turn, I was home bored and decided to watch some porn on my laptop and masturbate myself. I was just starting to stroke my hard cock, when my mother's assistant came in catching me. She had wanted me to drive her to the closest mall, as she can't drive a car herself as she never needed one before. Her interest in going to the mall disappeared straight away, as she was also a bit horny. Not backward she straight out me if I wanted a real woman instead of a picture of one. I decided why not, and we started fucking that day and regularly since. My mother returned home 3 days later, and I sleep with her assistant regularly. It's a mutual satisfaction arrangement, which I enjoy very much.