Ty found himself staring at infant June on his bed in awe of his abilities. After messing with Dustin remotely, adjusting gender and species, putting June through her size changes, and changing himself as he pleased, it was becoming clear he could literally do whatever he wanted.
The baby girl on his bed cooed and flailed happily, not a care in the world in her baby mind.
Hmmm, Ty realized, he had a golden opportunity to remake her into whatever he wanted. Although he kind of liked slutty step mom June, so he decided to refrain from changing her mentally.
But physically? Mmmm, that had some potential.
The 15 year old blushed as he realized he was fully hard again. Thanks to his previous feature adjustment, he was now the proper development for his age and quite a handsome looking young man.
He wasn't actually attracted to baby June, he realized, much to his relief, but rather what he was about to do to her.
He approached the baby, who smiled at him gleefully and cooed. He began to progress her. Develop her. Slowly. He ensured perfect vitality, the perfect amount of nutrition, the perfect physical development.
To his surprise, the 1 year old suddenly sprouted into an unusually tall two year old with short brunette hair. She blinked in shock and smiled again, falling onto her belly and sitting herself up.
"Hewwo Ty!" She waved happily, still quite oblivious. "I member you agin!"
Ty progressed her again under the new conditions and growth. The two year old suddenly jolted and grew into an adorable three year old. She was still a little round, but somehow very healthy.
"Oh!" June blinked, still sitting up. She played with her shoulder length hair and looked down. "I'm gwowing up again!"
He sharpened her mind, flooded in her memories, and continued her perfect development, and bit his lip as a rather adorable four year grew in. She was already three feet tall!
June blinked several times, sucked in a deep breath, and looked down at her tiny and lean four year old body.
"I'm... I'm..." She trailed off and stroked her thighs gently. "I was never this... this... big. Not at fowr!"
"I-I know." Ty blushed. "I'm punching you up a little bit."
"Oh!" June blinked, blushing in embarrassment, still shocked. "K-Keep going!"
Ty pushed her to five. She was growing exponentially! Already three and a half feet tall, she was a lean and shockingly athletic child, with muscle already developing. Her eyes were somehow wider and cuter, still looking like a young June, but with hints of the wild sexually charged woman she was growing into.
Six. June held on and writhed a little on the bed. She was sweating with the intensity of it. Now a little girl, she was soaking in inches of height with every year. She was going to be a huge grown up. Four feet tall! At just six years old June was four feet! Her arms and legs were longer in proportion to her torso now.
He pushed her on to seven, startled as she let out a girly child sized mmmm.
"I'm..." She saw Ty staring in shock and her own face lit up and blushed hot red with the realization. "I'm already getting my sexuality. Oh God, Ty...."
Eight. She visibly strained as her body progressed, muscle, organs, and bones stretching as she hit four foot five. She was getting lanky now, her limbs looong on her fit young body.
"Unnnnnnnghhhh!" June gritted her teeth. She clenched her young fists and her eyes closed.
Nine. Still clenching, she started to blush hot red as sweat poured over her trim young frame. Her hair was down her back now. She had visible and startling muscle definition.
Ten! June's nipples grew puffy and she grew to four foot seven. She gasped, startled, as her young pussy grew moist and began to visibly develop. "Ohhhh fuuucccckkkk" she squealed, which was jarring for a still "little" girl, popping and creaking as puberty kicked in with a vengeance.
Eleven. Ty gaped as June positively exploded with super charged estrogen powered natural female growth. She screamed out loud as her breasts jiggled and expanded under her nipples. Already a B cup as her height increased wildly. She writhed and squeaked her way to five foot two, body beginning to grow feminine. Still lanky and lean, her waist cinched down a little.
Twelve. Ty felt like he might cum from the sheer sight of it. June pitched forward on her hands and knees and gasped wildly as her new breasts expanded like filling balloons and her overall figure began to lose its girlish tightness and fill out. Already her hips were rounder and her legs were beginning to curve. She was tightly muscled now, athletic, with a light six pack and visible biceps straining under her smooth perfect flesh. It was her height, though! Talk about a growth spurt! She must be a hair or so under six feet tall!
Ty kept the momentum going, his dick leaking a steady stream of hot pre. Thirteen! Again, she exploded with growth and development. Limbs grew tighter, hips grew thicker. Her ass swelled, her torso grew out, her breasts reached alarmingly round C cups with tightly hardened nipples bulging forth. Her muscles audibly strengthened, staying tight and lean, as she grunted and sweated on all fours, head pulled up toward the ceiling with delicious pleasure as she became a busty and shapely young lady of six feet and six inches!
Fourteen. June barely had time to catch her breath before the growth hit her hard again. Fourteen saw her breasts jiggle and swell into D cups while her fit and delicious body became more womanly, hips sloping out, body growing in proportion, ass cheeks inflating just enough to give her a tight bum. She was well on her way to seven feet!
"Ohhhhh!" June screamed, panting. "More! More! FUCKING MORE!"
Ty pressed her on, watching June ooze a steady trickle of pussy juice as she hit 15 again and positively blew up, hitting seven feet delicious feet tall and filling out to a heavy double D. Her hair hung in wild silky strands over her back and shoulders. Her big heavy tits swayed with her breath. She clenched her vaginal muscles in raw pleasure, pulsating, but Ty wasn't satisfied.
Sixteen. Sweet sixteen. Sexy sixteen. June let out a whimper as she surged forward, her super puberty flooding her body with just the right conditions for perfect human growth. She jotled in spurts, growing forward past the seven foot mark, breasts now the size of honeydew melons with big pert nipples capping their soft flesh. She was athletic! God damn, she was a well defined girl! Her muscles had now hardened definitively. Years of work and maintenance flooding out in the space of seconds. Her torso was thick and fit, her hips and her ass filled out a little more, and her arms and legs crunched and strengthened more, even her slim neck showing a little bit of buffness.
Seventeen. June let out a cry and erupted. Her pussy ejected clear white fluid in a spray behind her and she spasmed magnificently on her hands and knees as she passed seven feet tall and grew toward eight. She was, to say the least, the most incredible specimen of a strong female Ty had ever seen. As she orgasmed out the last of her fluid, her breasts bulged and seemed to double in size. My God, Ty realized, she did say she was a late bloomer!
Eighteen. Ty took several steps back as June's already incredible development hit accelerate. She grew almost uncontrollably, long legs sliding over the edges of the bed as she sat up, still leaking hot pussy cream as she grew... and grew... and GREW! Eight feet? That was tiny! June pitched forward, hands trembling, and cupped her massive breasts as they inflated huge and firm on her chest, speeding past NINE feet fall and still going as she hit and then zoomed past ten.
With a sudden halt, June found herself tight and toned and sitting on Ty's soaked bedsheets a mini-giantess of eleven feet tall. Dazed, dizzy, pleasured beyond anything she had ever felt before, the biggest woman in the world blinked several times and began to examine herself, hot sweat dripping from her supple skin, her ass length brunette hair tangled and matted from the exertion.
"I'm so huge..." She whispered, voice an octave deeper than normal, hoisting her balloon tits in each hand, marvelling at their size and weight even as she realized her physical athleticism and buff bod gave her to ability to easily bear them. She squeezed her breasts and was startled by their softness, their sensations. Her nipples seemed to strain even bigger.
Ty stood against the wall in shock, well and truly surprised with how big his step mom had become. His dick was almost painfully hardened. June eyed him, his cock, and licked her plump lips.
"Mmmm," she said sultrily, "Now... you were saying something about changing species?"