Jen and Claire decide that they will each also take a pill alongside Martha and Lucy, with the hopes that they might grow to match their now insanely massive parents. Once they had slipped a pill into both Martha and Lucy's food the conjoined sisters coughed up and immediately swallowed pills of their own.
Upon eating their pills, Martha and Lucy pulled away from each other, becoming separate beings once again. Martha continued to change on her own but Lucy, as if she remembered her time fused with the girls, ran over and hugged them, causing all three to fall to the ground in a heap as they merged together.
When they went to right themselves they found that the way their body was now oriented, Claire was on top of Jen, their arms and legs having switched places so that they now matched where their hands and feet were, while Lucy was stuck behind Jen, her body still in an indistinct shape. The girls also noticed that they were growing, they were already almost ten feet tall in their crumpled position on the ground and their growth only seemed to be speeding up while their body continued to reshape itself
Claire watched as red scales covered their body down to just above their hips, with the ones on her front being a more pink shade, her pussy-face becoming a draconic muzzle not unlike the one three of their parents sported just a moment ago, with a long neck connecting it to her shoulders.
Jen meanwhile found her legs transforming into horse legs, complete with hooves while her behind stretched out into the chest of a horse. Once her behind had turned into the front half of a horse, it stopped and Lucy's form picking up where it left off. Their back hips and legs were those of a dog, a thick canine cock growing between them. As their back cock grew long enough to extend past their front legs it's head reshaped itself into the humanoid head of Lucy.
As their body passes the fifty foot mark, Claire feels pressure on several parts of her torso, five pairs of breasts growing in, alongside a second pair of arms that grows out above her hips. Her shoulders then widen slightly as two identical heads grow on either side of her original one, her vision going fuzzy for a moment before she gets used to seeing out of her new sets of eyes.
Their body now over one-hundred feet tall, Jen's cock-head began to grow proportionally larger, while her breasts-balls moved between her equine legs before swelling down to her knees. Her cock-head reformed itself into a cock-torso, Jen's upper body making up the last third of her now equine cock. Meanwhile, three tails grew out of Lucy's behind, the left one was canine, the fur colour matching Lucy's own, the right one was equine, and the middle one was a draconic tail the same length as their tauric lower body. Finally, a pair of pussies grew in between the centre tail and the others.
The girls growth had stopped once they were one-hundred-fifty feet to the upper shoulders and their lower body was three-hundred feet long. Jen's cock-body was long enough that her head was above their upper shoulders, held upright by their five sets of fifty-foot cleavage. They were still a long shot from being as large as their parents but at least they could reasonably use the gaint furniture.
Once they had taken stock of their own body, they began looking for Martha, whose transformation must have concluded by now. They found her busy cleaning up the flooded living room, but their wasn't just one of them: Martha had split into six separate bodies!
All of them were twenty-five foot tall fairies, each with a different wing colour, as well as different sexual mutations. The first had red wings as well as a twenty foot long horse-cock and a matching pair of horse balls that hung down as she flew over the lake pushing special mop that absorbed the cum easily. The next, whose wings were blue, had three pairs of arms and breasts; she was currently carrying fresh buckets of water to the other Martha's as they cleaned. The third Martha, wiping off the cum-plashed furniture, had green wings. She also had two pairs of legs, side-by-side, with an average sized cock in both crotches. Cleaning the TV screen was a Martha that had yellow-wings and three identical heads. A black winged Martha was busy washing the cum out of their employer's fur, her massive tit's and dick nipples making it a bit difficult. The final Martha, her wings so white they were almost transparent, had two fifteen foot cocks replacing her legs. Her task seemed to be cleaning the massive horsecock that had created the mass in the first place.
With the six of them working together, it seemed that the Marthas didn't need any help, so Jen, Clair and Lucy were free to do other things with their new giant body.