Katherine entered the TF chamber and the machine light up to signal that it was active. two menus appeared on the wall of the chamber. One listed a bunch of changes and the other listed the other TF chambers that were also active.
Katherine tapped on the other tf chambers and a voice chat opened up and Katherine said "Hello, you guys there?"
Sandra said "The speakers work."
Jake said "Well Sandra's here, as am I Jake."
Timmy said "I'm here as well... So what are we going to do?"
Sandra said "How about we grow up about ten years or so? Our birthdays are coming up so we'll be eighteen."
Timmy said with a chuckle in his words "Oh all the things we can do when we're eighteen."
Sandra said "May as well, it'll be nice to see what we'll look like when we grow up."
Katherine responded "so it's decided, Adulthood here we come!"
Katherine then selected the age option to eighteen in the change menu and then the voice chat ended. Katherine frowned a bit as the voice chat ended since the budget TF chamber needed all the power it could get to warp reality and show off some of it's graphics. The walls around Katherine glowed with a night sky with a sun and moon spinning east and west quickly, and after a few seconds Katherine realized she her torso was lengthening and her baby fat was starting to disappear. Half way through the transformation Katherine started to go through puberty as her nipples started too grow sensitive and lengthen. At this time the hormones rapidly going through her body awakened some more adult feelings in her and she nearly orgasmed as her breasts grew and her hips widened. The transformation overall took less than a minute, but it felt like it took so much longer. A little mirror appeared on one of the walls, and Katherine picked herself up to look at herself. Her face had definitely matured as it was more... angular with a lot less cute. She was a little short at 5'4'' but she had some nice curves and C-cup breasts. She wondered what Timmy and Jake looked like and decided to go out of the chamber. Katherine was the first out and ended up seeing that...