A story in the Home Schooling Series (4) Della's home with her new daughter, Susan, and Don, father of both of them, invites his Aunt Grace to help out with the housekeeping, because his sister, Celia, is herself away giving birth to their son. Grace brings her son, Joplin, with her. He turns out to be Don's son also. Soon both men and both women are enjoying sexual relations with each other, and the consequences are just what you'd expect.
Unknown to his son and daughter, this father was home and in his room when they began their sex romp. Instead of interrupting, he instead watched the action because he'd been long having unnatural feelings. Later, alone in the house with his daughter, he confronts the 15-year-old, demanding a piece of the action.
A bent cock gets experimental medical treatment that makes life much more interesting for our hero. Not only is the crooked made straight, but the "road" gets lengthened and thickened in the process. ...and when you get a gift like that, it's important to share it with the everyone else...