"Ok, cool," said Nichole. She was reaching that age where she was starting to think she was too old to need a babysitter. But Amy was an exception since she was so cool. Amy had been looking after for as long as she could remember and she felt like family.
Nichole had no idea how true that was going to be. The Chronivac was starting with gradual changes, swapping the various ages of subjects around before it proceeded to its goal. And it was constantly tweaking and adjusting its goal based on new inputs.
Subjects: Simon (34), Kim (30), Amy (25), John (12), Nichole (10), Stored years (13)
Updating John and Nichole parameters
The Chronovac tried an experimental adjustment, to see what the optimal configuration was. It transferred two years from John to Nichole.
Nichole's dark brown hair lost its pigtails, her mind expanded all the way to 6th grade knowledge. She didn't notice anything unusual with her current family, except for her bratty little brother, Johnny. Of course, being older meant that Nichole was able to boss him around when needed.
Elsewhere in the house, Johnny shrunk two inches, and the homework he was working on grew less complicated.
Subjects: Simon (34), Kim (30), Amy (25), John (10), Nichole (12), Stored years (13)
Adjusting plan accordingly.