The first story I every wrote was when I was five. My parents put me in an after school program and some of the teachers would have us write holiday themed stories. Mine was about three super powered sibling turkeys and a witch who kidnapped the girl turkey. She in turn is rescued by her brothers and she falls in love with her oldest brother. First ever and only incest story I've written
I didn't even understand what I did until I found the book later on. But that was fifteen years ago almost exactly.