"He leaves and step mom fucks my teen daughter." For some parents, the words "he leaves and step mom fucks my teen daughter" are something they never want to hear. For their daughters, it is a clarion call to them to begin a sexual affair with each other, which in turn will give them both gratification of their forbidden pleasures. It has happened to so many families. For the step moms, they are left with the humiliating fact that their husband or boyfriend has not only left them, but he has chosen to do so while she is around..