Not every day a 36 year-old single man "inherits" three under-age sisters. It's an 'instant family' he could get to really enjoy....but then, there's the mother also!
A story in the Home Schooling Series 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.
I started this one but ran out of thought. Radio_Guy played with it but it was too hot for finestories. I took it back but put some explicit sex in it. It's a good story about the survivors of a lost flight. Hope you enjoy it.