Jeff confirmed his choice, blushing and grinning with arousal at the thought that soon he would be nothing but an object, for who knows how long. The changes began immediately, and Jeff felt his skin grow tougher and heavier, squeaking slightly as he moved. He quickly slid off his shirt and kicked away his shoes, pushing down his pants and underwear in one smooth motion, before pulling off both his socks as well. He lay back on his bed, stretching and grinning, his naked body tingling with the sensations of the change.
His thickening skin changed first, further growing hard and cold, the texture altering to a smooth but tough consistency. He began to change colour all over, patches of skin growing darker and spreading, the patches matching up as they deepened, making Jeff's body a deep shiny black all over.
Jeff grinned, his cock hardening with arousal from these transformations. He watched as it grew longer and longer, far more so than he was normally familiar with. It began to change, also, the shaft becoming soft and even a little fluffy. It began to grow slimmer, his cockhead darkening into a shiny hard cylinder as flesh was replaced with metal. He shuddered as his cock moved on its own, sliding like a snake over to one side of his chest, where it suddenly split in two, breaking open into two twin thin strings. These then pushed into his black skin, making him shiver with sudden pleasure. He felt his dicks moving through him, before they pushed out on the other side of his belly, moving upwards and across to penetrate again. This repeated several times, making Jeff gasp and shudder with pleasure, until his entire chest was laced up with a criss-cross of his own two cocks.
Jeff barely had time to register this bizarre change before his legs began to press together against his will, the black flesh becoming soft and malleable. He groaned as his bones knitted together and his muscles formed into one, leaving no discernible crease in his lower half. His feet and legs swelled and grew larger, matching the width of his torso.
Jeff's arms felt weak and light, and began to press against the sides of his chest, black flesh opening and swallowing his limbs, leaving his torso completely limbless. He felt stiffness flow through his body, and gradually his control over his movements faded. He felt himself sit upwards, his torso standing at right angles to his outstretched lower body. His form began to round out, features fading and smoothing as he felt a heaviness under his legs and at his rear.
He was lifted up slightly as his bottom hardened and thickened, turning a darker matte black. It stiffened into a hard sole, the base roughening into deep treads. Jeff's mouth opened wide, stretching out wider and wider as he found himself forced to crane his head upwards. His head sank downwards, fusing with his neck. His tongue pushed upwards, thickening into a wide leather strap that poked up over his hugely open mouth, which was now covering his entire face.
Jeff's body began to shrink, his facial features becoming covered by the black leather, his face tingling as the transformation finished up. He felt a huge empty hollowness forming within him, pushing out down to his toes and through his sides, leaving his insides a massive hole, lined with soft felt.
After a few more seconds, Jeff had shrunk down to an appropriate size, his change complete. He was now a large, heavy leather boot, awaiting an owner. He could just barely see the computer screen, and waited to see the length of his change and what would become of him.