Replacing Dad

My father (49) had almost totally stopped having sex with my mother (45), preferring golf or fishing on the weekends and being too tired after work on weeknights. My mother likes sex, but due to their social position in the community, having a relationship outside marriage wasn't possible in her view. Which is where I (20) came in as the solution; I'm the youngest of three and the only one still living at home. I didn't go to college; I trained as a mechanic. I date, but not that often. So, my mother decided that a cock in the hand is better than two in the bush, as the saying goes. Never backward in her actions, she straight-up asked me to fuck her. Shocked and somewhat horny, I agreed, and that's how we became each other's sex toy. She taught me how to please her; she gave me sex almost every time I wanted it. Since March this year, I've been my mother's lover; my father is still too busy playing golf or fishing or going to sleep after getting home from work.