Kate's curiosity got the better of her. She wanted to see how the dynamic would change if she was the mother. She wished herself to be 30. She didn't want to be too old, but old enough to be Kellie's mother, with some further adjustments. Her body softened, while her face hardened. Not a huge change, but enough that she was glad she stopped there. She then walked over to her old room to check on Kellie.
Kellie lay down on "her" bed. She was furious that this change had happened. Why? And why didn't her sister notice anything? She was more mad at how her mind had changed. She couldn't act or think like a grown-up! Why? She couldn't remember what she looked like; all she pictured was her 13-year-old face on a woman's body. Whatever age she was supposed to be, anyway. Part of her felt like this really was her room. And she was even having trouble remembering Kate as a little sister. Why why why!? She kicked her legs on the bed with futility, and got up to look at herself in the mirror, hoping that she could find some evidence of maturity beyond the small cone-shaped boobies and the suggestion of curves. She couldn't imagine that the clothes she wore once fit, even though she was sure they did.
Kate entered, and sat next to Kellie. "Hey, I've been thinking about what you said, and I think I know what's going on."
"You believe me?!"
"You want to be older so much, that you let your imagination convince you that you're a teenager."
This was not welcome to Kellie's ears. "But I AM. Wait, didn't you say I was 13 earlier? That's still a teen!" She felt her feet leave the floor. She leapt off of the bed. As she held her pants up with one hand, she felt her boobies recede into nothing "No, no, no, no, no! Mom, this isn't right at all! I-" Wait, "Mom"? They were sisters, right? But Mom was so old... "Mom, I really am supposed to be a grown-up!" Her voice failed betrayed her mid sentence, losing the lower pitches entirely, leaving her sounding like a little kid. Her face had given up the last vestiges of teenhood. "Mom, I'm supposed to be a teen!" She was now short enough to be at eye level with her seated mother.
"You're growing up so fast already! Besides, I already indulged your little fantasy by getting you those clothes."
"But Mommy!"
"Don't worry; you'll be a teen before you know it! 10 will fly by, then 11, then 12, and then you'll be a teen!"
"...ok, Mommy."
Kellie was sure there was something wrong, but she couldn't figure out what. She just knew she wanted to be older.