"How about I surprise the two of you" said Jeff's Mom.
"OK" Jeff said, "Fine..." said Megan
"The two of you go to the front room, I'll call you when I'm ready"
as Jeff and Megan left, their mom turned to the computer screen
"Lets see", she first selected Jeff, than changed his age to 13.
Megan was next, she changed her age to 16, Jeff's current age.
She studied the display on the monitor and decided to also change some other things. Megan was quite chubby, not that this was a problem but Jeff's mom, Christina, decided that she didn't want a chubby girl and so decided to completely reinvent Megan's look so she was attractive, but also so she looked smart.
The first thing she did was slim her down to a reasonable 135 pounds to a five foot nine frame. She then made her curves more accentuated. Her breasts became DD cups three sizes larger than they had been. She then gave her a curvy waist and hips. Giving her an hourglass figure. A few more touch ups here and there and her body was done. She then moved on to her face. She only changed a few things like making her hair black instead of blonde and making her eyes brighter.
She then called the two of them back in.
"Are you ready?" Christina asked them.
"Just do it," Said Jeff.
"Okay then . If you're sure," Christina replied. She hit the enter key on the keyboard. The changes started almost instantly. Neither Jeff or Megan felt anything at first but then both of them hugged their stomachs as searing pain flew through their bodies. Megan went down on all fours as she started to become taller. Her arms, legs, torso, everything was getting longer as she grew up. Jeff on the other hand was shrinking. He shrank down until he was only 5 foot 3 making him now only at Megan's shoulder height. All the hair on his body below his eyes disappeared as he became younger. Then it all stopped.
They both stood up as the changes had finished. They looked themselves over then each other. They gasped running their hands over their new bodies. Christina had made their clothes fit them as well so they didn't have to hide their nudity. Megan went and hugged her mom as she was so happy. Jeff on the other hand was not so happy.
"How could you do this to me,?" He yelled.
"Well it was quite simple dear," Christina said, "I just used the Chronivac."
"Change me back."
"Jeff don't be so rude. Act your age. You know what it's past your bedtime, go to bed."
"I don't have a bedtime."
"You do now, upstairs or I'll make you younger."
Jeff ran upstairs and got in to bed. He didn't want to be made any younger.
"You're going to make him younger anyway, aren't you?" Megan asked, surprised at the sound of her voice.
"Of course," Christina said. She went over to the Chronivac to make Jeff younger in his sleep.