"Yeah! Let's see if I grow more!" Dusty said enthusiastically.
"Okay!" Ty agreed. "But you have to kiss me like a big girl to make it work, okay?"
"Like... before?" Dusty blushed. "How do big girls kiss?"
"Here!" Ty placed his arms on the little girl's shoulders and smiled. "Let me teach you how."
"Oooh!" Dusty jumped excitedly. "Okay! Show me how!" She smiled enthusiastically. "Then I'll do it to you!"
"Now close your eyes." Ty leaned forward gently and pressed his lip's to Dusty's. He kissed her like his 6th grade crush, Megan Price, locking his lips to hers and tenderly, sinfully, suckling on her lips.
Lost in the moment, he closed his own eyes in wonder as Dusty quickly caught on, returning the same motions clumsily at first before getting more comfortable and kissing like a pro.
The girl grew. From her state of just kicking into puberty, the 13 year old girl's smaller body soon caught up to her real age. Her boobs swelled forth just a little more. Her hips widened ever so slightly, and her legs and arms got long and willowy. Her face gained a little maturity and her blonde hair grew longer. She was now a little over 4'9".
Ty broke the kiss and grinned seductivley. "There we go, Dusty. Now you can kiss like a big girl does."
"D-Did I do good?" Dusty stared at Ty's eyes nervously, wanting the approval.
"Well, just look at you!" Ty pointed.
Dusty looked down and squeeled. "Oh my God!" She said quickly, jumping up and down excitedly. "I'm *huge* now! I'm almost as big as the tall girl in our class!" She stared at her too tight and ill fitting dress, at her 34a breasts, her taller lankier frame, and her more developed waist. "Ty!" She threw her arms around her step brother's neck. "This is awesome! You made me grow! Thank you!"
"Mmmm!" Ty squeezed back and smiled. "You're welcome, honey."
The girl broke the hug suddenly and a mischievious look grew on her face. "Hey... big brother, what do you think would happen if we did it again? Do you think I'd get *bigger* than the girls in my class?"
Ty smirked. "Well, only one way to find out, huh Dusty?"