Jeff thought, Who better to test it on than himself? He'd be able to feel the changes in real time, and test whatever he really wanted. He set himself as the target, but then added one more little thing.
While the change was in effect, he would be able to always see the time left, regardless of the distance from the Chronivac. He put that in so he didn't get caught in the wrong form when it ran out, and he'd be able to return to his original state without another transformation.
He confirmed the change. It didn't take long for him to start changing; He felt as though his skin were melting, his legs forming into a pool of slime falling off his chair and onto the floor. He went to stand up, but found a bit of trouble standing on the melting nubs at the end of his feet.
The slime trailed up his body, his knees the next to be taken before his upper legs begin melting. Jeff tried to walk on the remaining nubs he had, getting away from his desk, but couldn't make it far before the last of his legs melt away.
His crotch was soon overtaken, and it started taking over the various organs down there. The slime he had previously pooled into had moved to further surround him as his genitals had melted off, and it started consuming his rectum and parts of his bladder; Jeff could feel the stored urine in the slime as his bladder melted away.
As it continued up, he soon was left with his arms, head, and upper torso. His heart became slime, followed by his lungs, and he wasn't able to breathe anymore. The slime got up to his armpits, and took over his shoulders; His neck and arms were disconnected, though Jeff could still control his arms as they turned to slime.
His arms were taken over entirely as his jaw had melted, his head continuing to melt. Soon, he felt his senses numbing, as his brain and the top of his head became slime...
The next thing Jeff remembers is the re-forming into his own body, as everything went back into place. He was now a transparent green, with a few drops of slime hanging down as he moved his arms. "Woahhh..."
His voice had even changed; His voice was higher, with a faint echo to it, providing an interesting change with it. "I didn't even set it to change my voice, but this is cool!" His clothes were all piled up on the ground, as he was in a 'naked' state; Not that he'd ever truly have clothes, but nothing was formed over him.
He did a few tests, confirming that he could, indeed, fully control his slime body; He first tried jumping, which had a squishy sound as he landed, to confirm he wasn't stuck to the ground. He also briefly shifted his form, first testing the clothes thing, then shifting into an object and back again. "You know, this is fun!"
He wanted to try some other parts of the transformation, but knew he'd have to find someone to see if shifting into another person worked. "Alright, uhhh..." He thought about it, and decided to go for...