We have met Becky's divorced father before, where he volunteered to help Becky get adjusted to her mother's abandonment of her and her father for her mother's boss.
As time progressed, the senior Girl Scouts finally have to leave for college, and as a fond farewell Maria, Lindsey, and Jamie seduce Becky's father and are introduced to love-making instead of simple fucking. Even little Ana gets into the act by surrendering her underaged hymen to the cause.
When Becky arrives back home she discovers Daddy's philandering and instead of being pissed off, she joins the exclusive club, and even initiates Lindsey into a three-for-all; and then Becky makes her father her life's work!
Rod has what I call a simple way of story telling that at times eliminates the chaff, and feeds us not the wheat, but the wonderful kernel of the story.