As Sarah pressed the button on the device, a violent shudder ran through Roy's body. It was a bizarre sensation, like nothing Roy had ever felt before, and it was very different from the instantaneous non-sensation that had accompanied his initial swap with Sarah. but the feeling passed almost as soon as it had started, and Roy was left feeling dizzy and disoriented.
"Ugh, what was that?" he asked. And then he frowned.. his voice had sounded strange. Thin, high-pitched. Almost... like...
With sudden horror, Roy turned his gaze downward and gasped as he took in the shape of his body. He didn't see his own body dressed in Sarah's clothing, as he might have expected, and as he had just a moment before. No... his body looked strange, warped to his eyes, like it had been twisted as in a funhouse mirror. Roy blinked, and then, suddenly, he made sense of the picture before his eyes. The bulges of his chest, the curve of his waist, the flare of his hips... he wasn't some sideshow freak with a twisted body. He was a woman!
He lifted his hands, which looked smaller and smoother, and then tentatively placed them over his new chest. It was a familiar sensation on his palms as he cupped his new breasts with his hands--no different from caressing a girlfriend's body, although it was strange to do it from this angle--but it felt whollly unfamiliar from the inside. His breasts felt heavy, swollen, and oddly sensitive to his touch, even through the fabric of his sweater, his blouse and--he took in a sharp breath--his bra. He lifted his breasts and felt the strange sensation of his flesh shifting and squishing, and then he let go and felt as his breasts fell and were caught by his bra. Then he ran his hands along the curve of his waist and hips, and at last, he slid them down to his crotch and felt both the lack of his penis and the presence of something now.
"What on earth?" he said... and then he stopped as he realized he recognized his new voice. It wasn't just a random woman's voice... it was Sarah's! The device had turned him into Sarah, both in life AND in body now!
Roy looked up angrily at Sarah, who looked much taller now... although Roy realized that it wasn't that she was taller; it was that he was shorter. He began to open his mouth, intending to demand that Sarah change him back, but he stopped himself. As long as Sarah was holding the device, she had total control over his fate, and judging from the slightly sadistic grin on her face, Roy had a hunch that he needed to be careful about what he said over the next few minutes. There were worse things in the world, after all, than being a young, pretty, healthy, relatively successful woman...