A story in the Karinaverse (Traveller) Universe
While giving her friend Heinz a ride home in her starship, space pilot Karina asks him to help her relieve her boob pain from lactation. Pregnancy ensues. (Part of the "Karinaverse".)
Two young brides flee a polygamous cult when the patriarch can't father more children. They don't know what it is the old man can't do, so Frank shows them. Later he bluffs his way in to take the old man's place, and ultimately sets everyone free.
Twin Brother and Sister raised to be very close to each other make love at a party and later made love with each other in their apartment. They found that their love making was genuine and they wanted to continue making love with each other after they graduated from college. She told him that she wanted to have his babies.
Older sister seduces her younger brother. They begin making love often and thought that she was protected by an IUD. She missed two periods and began having morning sickness. Her OBGYN told her she was pregnant.