After the late lunch and some playful fooling around in showers, the four of us dressed and gathered back down by the pool as the sun went down to discuss what had happened and how things might be if we all stayed together.

"So let me get this straight," Mom said. "We all live here with Thomas. His sister, the love of his life, plus his girlfriend and his mother. We all get to have sex with him."

"Right," said Tina.

"You won't have a problem with that, Tina?" Mom said.

"Nope," said Tina.

"And further," said Mom, "we all get to have sex with each other."

Tina immediately blushed,...