Trying to find this story.
Mother decides with husband's knowledge to help early teens son "relieve his tensions" by showing him how to masturbate. It soon progresses until the mother is fucking the son. She soon becomes submissive to the son fucking him regularly and he shares her with her friends. Father and older teen daughter masturbate in front of each other but despite mother's urging, they never fuck.
Father has enough of the situation and moves out with daughter and they end their sex play. Mother and son stay together and he gets her pregnant.
Anyone recognize this?
