Starship Gangbang: A Breeding Orgy in Space by Lilith Archer
Approx. 6,340 words.
Published on January 10, 2013.
Marooned in space with a busted stardrive, shipmates Natalie and Jaycee decide if they ever want to see Earth again, they will have to have children to finish the return trip home. With ship morale at an all-time low, the two think an orgy will do the trick to bond the crew again while randomizing the paternity of their progeny.