As Jane watched her mother plead with her, begging for her cock, she found her hand reaching towards the packet of pills as her cock reached higher and higher. And as she grabbed it, a curious idea struck the tiny girl. Her cock, which was over half of her 3'9 height, was stretching up towards her face, its single eye winking at her. She could feel its - her - hunger for her own mother's pussy, but what if she satiated that hunger in a different way? Slowly, she grabbed a single pill from the packet, lined it up with her slit, and then pushed it into the hole.
It was excruciating for the first few seconds as the pill, small as it was, stretched the tube to its limits. Jane cried out, but she didn't stop, pushing it down further. Some of the lining began to disintegrate, letting trace amounts of the powder within to leak out. It absorbed into the spongy walls, and soon they became just slightly wider, giving the rest of the capsule a smooth ride through her rod, and increasing the girth of her cock at the same time. Jane gasped in relief as the pill slid down smoothly. As it continued its path down the dick, leaving a trail of drugs behind it, the path continued to widen, before it found itself in Jane's cantaloupe-sized balls, where it finally dumped its load.
Immediately, Penny could see the difference. In just a second, their circumference had shot up by 3 inches, 4 the next second. It wasn't long before Jane's balls were the size of beach balls, hanging to the ground in her massive sack. Not to be outdone, Jane's cock began to expand as well. Far more than 3 inches, however, the grotesque shaft grew in leaps and bounds, pushing 3 feet, and then 4, as it dwarfed its mistress' entire body. The bottom of the shaft was just as wide as Jane's torso, and reached halfway up her belly from just the girth alone. Jane groaned as her four-foot dick began to rain pre-cum down on her head, feeling her heart beat desperately to fill the wrist-thick veins that adorned it.
But, with balls three times the size of her head, there were going to be consequences. The testosterone they produced flooded her system, and a strange sensation flooded her body. The mutation was kicking in, putting her already imbalanced hormones into overdrive, effectively kicking off some sort of hyper puberty.
Jane shot up in height, far surpassing her mother's rather respectable 5'9 as she pushed over the 7-foot limit, her cock once again just half her height as she stopped at 8'3. The hulking girl leaned hard against the couch, her fingers digging into the fabric as her body began to swell, bulging, bursting, larger and larger with each pulse of her heart. From the normal 55 pounds of a regular 6-year-old child, Jane's body ballooned with muscle, bloating her to an enormous 800 pounds. She let out a primal roar as her vocal cords changed, shifting to a deeper, more masculine tone. Hair began to cover her body, running up her thick, tree trunk arms and legs. As she straightened, her enormous balls finally lifted off the floor, though even with her ridiculous muscle mass, it seemed a strain. Her testicles alone were nearly 100 pounds of pure, dense semen, and swung heavily back and forth as she stepped up to her mother. As if to counteract the weight and stop the mountainous girl from toppling, her sack began to thicken, the skin becoming muscular and hard (which also helped protect them from being hurt) while her legs and ass swelled even further, her stance widening to make way for her fridge-like thighs. Jane's massive feet, each as big as her mother's torso, thundered across the floor as she stepped up to her poor, depraved mom where she sat on the floor.
Penny, who had been watching the transformation in mute awe up to this point, suddenly jolted back to life as her beast of a daughter towered over her. She knelt before the giant, looking up at her enormous rod, bigger than anything she could have imagined, and then further up at her more masculine face. Jane's chiselled, square jaw tilted down, as her eyes narrowed beneath her thick eyebrows. The growth had stimulated her brain, yes, bringing her intelligence to an average adult, but the side effects of the mutations had left it moulded around sex. She bared her teeth in the parody of a smile and picked Penny up with a single hand. She had just one word to say to her mother. "Worship."
Penny obeyed. As she was placed on her daughter's immense mountains of shoulders, she quickly found herself rubbing her hot body over her muscles. Jane's biceps, each larger than her entire body, were showered with kisses, before she worked her way down her forearms and even her thick, leathery hands. Then, down her body, Penny fell onto the shelf that was Jane's chest. Her breasts had been spared, though they were now just a c-cup proportionally, but dwarfed by the immense pecs behind them. But her nipples were ridiculously large, putting most men's cocks to shame as her mother teased them out, to their full 10-inch length. Jane groaned loudly, her body quivering with the roar. She shredded the couch with her thick, strong fingers as she arched her back in pleasure, letting her mother's touch wash over her.
Down Penny crawled, rubbing her own soft stomach - still stuffed full of cum - against Jane's brick wall abs. 18 abdominals flexed outward with each breath, a foot cleavage between each defined cinder block. A small Adonis belt ran across her hips, rippling as her stomach heaved in and out, her deep, rumbling breathing becoming more like pants as she watched her tiny, weak slave crawl closer and closer to her prize.
And then, Penny reached the crowning jewel. Her daughter's cock. Its base covered in thick fur, the four-foot pole towered above her. She pressed her entire body against its length, feeling the thick veins throb with each heartbeat, feeling the slick, hot skin beneath her. She shimmied upward, until she peeked over the cumslit, finding she could fit nearly an entire hand inside. Her tongue danced around its edges, licking up the salty liquid as the dick belched it out by the gallon.
Before she could try and fit her pussy on it, she felt a hand pick her up again and toss her on to the couch like a ragdoll. The monstrous girl leered, "Ah ah, not for you. You'll have to prove why I should reward you, slave."