Sara and Sam invite a college freshman to Thanksgiving dinner and end up in a bisex three-way with him. At Christmas, their daughter Renee joins Sara, Sam and Joey, leading to father-daughter and mother-daughter incest as well as other debauchery.
Deserted by his wife and left alone with his 15-year-old daughter, Jason soon begins to turn his attention to young Megan, which leads to voyeurism, then to masturbation, and finally, to the inevitable.
Miss Amanda Jones knows what she needs and how to get it. This story pushes the limits of physics, but isn't strictly science fiction. Temporarily suspend whatever you know about physics, and just accept the possibility.
A Master's Project Story (2) Todd didn't know he was a voyeur, and Lizzie didn't know she was an exhibitionist. Neither of them knew they'd be attracted to their own daughter. Then Bob interviewed them for his project and everything changed.
Boys & Girls, the Saga continues, crossing more family lines. This story is a note that I'm not dead yet. And it is a history-making event--Losgud's first follow-up, sequelesque piece. You do need to have read the original "Tandem" to catch all the nuances in this "Extra". If not, smart readers will catch on fast enough.