Mate!

Dwayne's eyes opened to the sound of buzzing. "Wha..."

A metal circlet surrounded his head, from which extended several wires. Pressure on his back told him that more were fixed to his spine. He tried to move and found his limbs unresponsive .

ZZZZZ YOU WILL MATE WITH THE FEMALE ZZZZZ

"Wha..." He looked over and saw what they were talking about. "Mary Lou?"

"Dwayne?" the girl looked up from the metallic rack to which she was affixed. "Is that you!?"

ZZZZ YOU WILL MATE WITH THE FEMALE ZZZZ

"What...no! I can't, she's my sister!"

Another long pause. In the control room there was a brief discussion. "They appear to be genetically related."

"why is that an issue?"

"There seems to be a taboo on this world in that regards."

"How primitive. Use remote commands, we must gauge his reactions."

There was a buzzing sound, and then Dwayne stepped jerkily forward, his legs moving under their own will. His spine tingled, and to his shock his penis raised to its full four inches in length. Ahead he saw his sister squirm, her skin flushed with arousal, wetness appearing between her legs, having as little control over her reactions as he....

It was too much. With a groan he ejaculated across the deck, droplets of semen spattering before his feet. Mary Lou looked up with a mixture of relief and the usual contempt she held her younger brother.

In the control room there was silence. Then....

"Fascinating. The male has no control over his functions."

"The specimen is inadequate.Perhaps we should eliminate it and procure another?"

"No, a different approach is in order. Prepare the Supramatomic Transmogrifier!"