Dusty was busy looking over her beautiful adult body in the mirror while Ty laid on the bed and attempted to put his blown mind back together. He found himself staring at his slowly deflating eleven inch cum cannon and then Dusty's pert perfectly shaped ass.
Like Ty, her rapid progression had developed her beyond the average girl. She was 6'4" to his 6'6", with firm and wonderfully blown up EE breasts, and tight feminine curves. He stared at her toned body as she examined herself and gleefully played with her big tits. "Oh, brother..." Dusty breathed, voice lusty. "No wonder big girls like sex!" She blushed somewhat on her cheeks. "I feel amazing. So... grown up."
Ty chuckled and managed to sit up, feeling his member swelling back to full size from the excitement of seeing Dusty's body. He was so horny...
She turned and faced her step brother with a grin. "I suppose I can't grow up anymore, can I?"
Ty considered this and tried to think of an excuse for Dusty to jump on his dick again. "Well..." Ty smirked, stroking his chin as he considered his gorgeous step sister. "I suppose if we were to have sex now, you'd just get bigger, not older." Hmmm. The idea of making that tall and sexy blonde bombshell a giantess was more than appealing.
"Oh, is that all?" Dusty frowned. "I don't wanna get bigger. I'm plenty big now!" She hugged herself, arms squeezing her firm tits. "The biggest girl in 5th grade!"
Ty briefly toyed with the idea of forcing her to grow, but decided he had other things he wanted to try. Maybe he'd super size her later, just for fun. Anyway... "Definitely." Ty agreed with Dusty's assessment. "Now why don't you just relax on the bed here?" Ty patted her matress and then stood up, his prick still rock hard. "I'm gonna go see mom."
"Okay!" Dusty agreed, under Ty's influence. "I suppose I'll just rest. All that growing up made me tired." She yawned as Ty urged her into a deep sleep.
"There's a good girl." Ty grinned, watching as Dusty fell asleep, only to wake up if Ty so willed it. "Now... let's see what June is up to. I have some more tests to run."