Jeff clicked "continue", shivering slightly with anticipation. Immediately, his body began to pulse with a tingling electric warmth. He pulled off his shirt quickly, looking down at his bare chest to see that the light dusting of body hair at his bellybutton seemed to have pulled in and disappeared. He stroked his navel, feeling an odd roughness on his normally smooth skin. Grinning and aroused, he reached down and pulled off his shoes and socks, feeling a clenching and throbbing as his toes began to change. As he watched, they fused together, melting into one rounded lump.
Feeling the same sensation moving into his fingers, he quickly unbuttoned his pants and wriggled out of them, lying back naked to observe the transformation. He clenched his fingers as best as he could before they fused together into a mitten-like paw, and became stiff and unresponsive. His skin began to darken, becoming a deep gold as if he was tanning. The golden color deepened to an unnatural shade, and the texture of his skin roughened to the consistency of biscuit.
He felt a coldness on his head as his hair loosened and fell out, the changes moving up his face. He felt dry and crackly, and it became harder and harder to move. He lied back, his legs and arms spreading akimbo as they began to flatten slightly, hardening and ceasing to respond when he tried to move them.
The changes were driving Jeff mad with arousal, and his cock hardened to full erection, poking up into the air. It was still the only fleshy part of him, and Jeff moaned with sudden ecstasy as he began to orgasm. Huge thick streams of white cum sprayed out in unbroken flows, squelching onto his chest in ropy strands. The cum didn't feel like semen, it was much thicker, and Jeff could smell the sweet scent of icing sugar. The strands of icing moved around on Jeff's body, outlining him in crude imitations of the shape of clothing.
Jeff's cock ceased squirting, and began to shrink, thickening as it did so until it was a fleshy ball on top of his testicles, which were swelling and growing rounder. The skin hardened and roughened, sugar crystals forming all over his crotch. His dick reddened to the deep shade of strawberry while one ball turned green and the other blue, becoming sweet gumdrops. He shivered as they rolled up, taking positions as "buttons" on his icing sugar "shirt".
Jeff's insides felt cold and still as, with a shudder, his heart stopped beating. The gingerbread seeped inside him, taking over his entire body. He began to smile, a forced expression that hardened into just a line of icing sugar in the form of a grin. His eyes opened and felt cold as they flattened out into chocolate buttons.
He felt himself shrinking as the gingerbread soaked into his brain, erasing the last vestiges of his human body. He could still think, and see, but he was motionless, and his thoughts were slow and somehow sticky. Before his vision blurred too much, he saw the flashing icon on the computer screen: "Duration Twelve Hours"
The world around him shook like a mirage, and he felt a hard warmth beneath him, where previously had been his bed. He could smell baking bread and cakes, and see people walking around in front of him. He seemed to be in some sort of glass case, and at the corner of his vision he could see other gingerbread men. With a jingling, the front door unlocked. He was in a bakery, and it had just opened. He could only hope that he could last the whole day.