Jeff decided he wanted to use it on his sister, Emma. "She wants to insult the Chronivac, why not show her what it can do..." With a poor attempt at an evil laugh, he sets Emma as his target, and confirms.
He minimized the chronivac window, and waited. A minute later, he heard a scream, and used this to go and check what's going. He ran over to where he last saw her, and saw the sight.
Emma's transformation was noticeable; She'd fallen out of her shoes, and was laying on the floor, Jeff given a view under her skirt; Her legs weren't quite gone, but it wasn't going to be long.
Emma tried to move away from the slime. "What's happening to me??" Jeff chose to play dumb; "I-I don't know...!" "Jeff?" She turned to look at him, stuck crawling on the ground now. More and more of her was turning to slime.
Jeff leaned down near the girl, picking her up. He wasn't sure what'd happen if he separated her too far, so he sat down next to the slime she was becoming, bringing her into his lap. The girl's panties fell off as her waist was turning to slime, Jeff feeling her privates briefly before they turned as well, covering his left hand.
Some of the slime on the ground moved towards them on it's own, but Jeff chose to try and disassociate himself from causing this, choosing to at least try and comfort her as she likely believed she was dying.
The girl's skirt slid off, leaving only the upper half of her in just a shirt. Jeff stayed there and sat with the girl, acting scared for her when he knew exactly what was happening. Still slowly, the slime spread through her body, and then her shirt slid off; Jeff was left holding a disembodied head, watching as it and her arms became slime...
...And soon, nothing was left. What was once his sister had become a pool of slime, which was covering his shirt, arms, and pants, as well as the floor around him. Especially his left hand, which had been right there at the transformations from the crotch all the way to the neck; His sister's genitals were part of the slime on it, which was definitely weird.
The slime started shaking, and he attempted to drop the slime to let all of it merge back up, but it stuck to his hand too well; He lowered his hand down, touching the slime to let it all connect, as it formed right in his lap...