With no particular ideas of his own, Jeff decided to just let the machine itself decide for him. Conveniently enough, there was an option for the Chronivac to scan the target and transform them based on their most secret fantasy. He selected Dean as the target, take place over a few minutes, and arranged for the transformation to have unlimited duration. After all, they could always just change him into something else later.
"Alright, it's just gonna change you based on your secret fantasies, Dean. This way I know you'll be happy about it!" Jeff said. Dean blinked, and then his cheeks turned a little red with embarrassment. "H-hey, no fair man! I don't want you finding out about...stuff like that!" he replied. Jeff just laughed and said "Well it's too late now!" Dean didn't get the chance to reply, because he was already starting to feel weird inside. His skin was warm and tingly and strangely sensitive. He lifted his arm, and saw that the sparse body hair he had was beginning to flatten and disappear. His skin looked shiny and unnaturally smooth. Every time he moved, his shifting body would make a strange squeak, and the feeling of his clothes sliding over his body was rapidly becoming too sensitive to bear. Every inch of him felt overwhelmingly pleasurable and smooth, and was tingling with lust.
Unable to handle it anymore, Dean growled and pulled his shirt off. The feeling of the fabric pulling over his body made him pant and grunt, but it granted blessed relief from that constant sensation. Still desperate, he pulled off his shoes and socks, freeing his larger, shiny feet from their prison. Wriggling on Jeff's bed, he shoved down his pants and underwear and tossed them aside, sighing with relief as now the only source of that sensitivity was where his bare back touched the bedsheets. Jeff looked away and winced. "Dude! Seriously?" he said, but Dean just flipped him the bird. "Man, you don't get to complain! I'm the one transforming here!" he said. Despite his protests, Jeff secretly glanced back at his naked friend to see the changes progress.
With Dean nude, the changes were clear. His body hair was gone, and his skin looked unnaturally smooth and shiny, the colour the same flat beige all over. His squeaking body showed that his skin was now some sort of slippery rubber. The hair on his head curled and flattened, becoming a brown rubber shape with hair-like contours, and he shuddered as his face lost its matte, fleshy appearance and became rubber as well, with lifeless-looking painted-on eyes and a shiny mouth of rubber teeth. Hesitantly, he reached down behind him and touched his rear, stroking his fingers down the tight stretchy rubber hole between his cheeks. His cock throbbed and bounced, hardening as it started to grow. It swelled out to almost twice its former size, becoming a thick and heavy ever-erect rubber dildo between his legs. Jeff stared at him, taking in the full sight of his bizarre rubber friend. "So this is like, your secret fantasy, dude?" he said. Dean just squirmed and looked away, humiliated.