Katie kept walking, pushing through her tween years. She got taller and thinner as the last of her baby fat drained out. As she finally hit her teen years at 13, she felt a tingle in her chest. She looked down to see that her nipples were making slight indentations in her tank top. As she walked, her nipples rubbed against her tank top more, feeling more sensitive as they did. The areas around them started getting more puffy as tissue began forming. "I'm growing boobies," said Katie, her mind expanding to explain what puberty is. The discomfort faded as a training bra appeared under her tank top, comfortably cradling her nascent breasts.
The beginning of puberty spurred Katie to walk even more, wondering how big she was going to get. As she continued through her teen years, she gained more height. Her legs became more shapely as her thighs and hips start filling out. She could feel her butt growing into a more appealing shape. Her tank top pulled up more, showing her belly button. Her training bra became a proper bra as her breasts expanded, putting her into the upper B's. Katie's face got prettier as her lips became fuller and her face started losing its roundness. Her hair grew longer before a band put it into a ponytail. At 16, Katie was becoming a looker and she knew it. "Sweet sixteen and ready to drive," she said proudly, her voice not sounding as high-pitched as before.
16 looked good, but there wasn't quite enough freedom for Katie. She pushed onward, going through the last of her high school years. She gained a little more height as her legs grew even more shapely. She could feel her hips and rear growing out to a childbearing form and a tingle through her groin told her she was fully ready to have children of her own. Her tank top fully slid up to reveal her flat stomach as it merged with her bra to become a sports bra. Her breasts swelled up to C cups as her cleavage became more displayed. Lipstick and earrings appeared as she pushed past what would have been her high school graduation. "I'm a legal adult," said Katie proudly, her voice dropping into a lovely tenor. At 18, she was now free to pursue adult interests.
She hit the stop button on the treadmill and got off it to get a good look at herself in the rest room. Noticing how hot she looked in the mirror, she did a few sexy poses and said, "Damn girl! You look really fine. Not too old, not too young, just the right type of age. Can't wait to show my aunt this bod."
What she said immediately caught her by surprise. She called her mom and aunt, and she doesn't know why. Kellie gave birth to Katie eight years ago, right? Then it hit her. Since she's eighteen and her mother gave birth to her at thirty, then her mom wouldn't give birth to her at a much earlier age. So with reality altering, Kellie was now an aunt to Katie and was doing her best to raising her right, especially to a young adult.
With that thought in her head, she smirked and said, "Guess I don't have to worry about my mom being protective. Now that she's an aunt, she would treat and spoil me like the niece that I am. Oh, ho, I can't wait to have her buy me the things I want without consequences." Turning to leave the restroom, she sauntered across the arcade and show off her body in front of the boys. "That's right..." she said to the teenage and college boys ogling at her, "Look but don't touch. One hot college girl coming through." Leaving the arcade, she wondered what to do now that she's officially an adult.