Something unexpected...

Jon's head was taken to another room, and placed on a machine that allowed him to observe what was going on. He found it allowed him to move his head in all directions, but only extended a few feet from the table the device was on. He looked, through a one-way mirror, at his former body. Attached to it was the head of an attractive woman, early thirties, pretty, with blonde hair, and tan skin. He saw the line where her neck meet his shoulders, realizing she was significantly tanner than he was. She was awake and naked, though, it seemed, by choice. He then realized why.
Walking into the room was what he realized was the woman's body. The woman's body was naked as well, save for a pair of strappy black high heels. However, attached to the woman's body what looked like the head of a robot!
It was round, small, and the neck was thin, much thinner than a normal neck. Where the shoulders met, it was covered by a form fitting material that attached the robots thin neck to the womanly body it now possessed.
The robot came in, walked over to the woman, and started to make out with her, minus the kissing, as the robot had no mouth.
"Is that robot programmed to do this?" Jon asked, surprised.
"No." The scientist looked over at him. "It's designed to learn on its own, adapt as needed, with a baseline moral code against hurting others. That is it. What you see, it learned."
The robot-woman hybrid started to stroke the dick of the woman who now possessed Jon's body. She moaned, telling the robot to stop.
It did, and as soon as she did, she grabbed her former body, had it lay down, and she started to fuck it missionary style. The robot gave verbal confirmations that it enjoyed this. This continued, the woman in Jon's body groping her former tits, and the robot-woman's arms and legs wrapped around it's former owner's new body. Suddenly, the robot started sputtering, and the woman then started to orgasm in her new, eighteen year old male body.
"Was that what you expected?" Jon asked, shocked.
"No, I did not count on sexual desire becoming a factor until much later. Interesting.
Jon...