She had wanted to make herself smaller, but instead the giant black draconic Mary suddenly decided to hell with her human life, being a dragon felt better. With her muscles swollen to a state she could never have hoped to achieve as a puny human being, and her strength elevated to godly levels, she suddenly found herself desperately wanting more power. The legendary beast that had stirred in her person was starting to place a foothold on her mind, and then Mary began to slip away completely. A lusty female black dragon wanting full release not Mary reached for the remainder of the dragon vial and gulped the rest down eagerly, savoring the flavor.
Mary screamed in delight as a fresh orgasm rolled over her body and made her spasm, thrashing and pounding her giant weight against the walls, which of course began to fall apart from the punishment. Her screaming turned to orgasmic snarling as powerful transformative energy began to flow through her, beginning to push her body into its final form and even greater heights of pleasure. Her writhing form soon began to enlarge again, in seconds stretching her already massive 16 tall form to double its size at 32 tall. Mary crashed through the walls as she grew, destroying the rooms and furnishings in her house as she stretched bigger and bigger, still groaning and hissing in perpetual orgasm from the sheer titillation of her change.
As she grew bigger she lost her anthro body completely. Her huge breasts shrank to nothingness, her torso stretched longer, her tail grew to almost more than the length of her body, and her arms turned to front legs and her hands into paws. She growled deeply as her jaws stretched to a fearsome length and her many teeth grew longer and deadlier serration. Her nostrils flared and began to smolder with the fire of a dragon and her eyes turned a terrifyingly dark shade of red. She was getting more powerful as well as bigger, muscle definition swelling and expanding over scales that had hardened into impenetrable plates of natural armor. The bony spines running down her scaly armored back grew sharper and more pronounced, the horns on the back of her head took on a demonic appearance as they grew into a long twisting spiral shape. It finished with a sharp spade of solid bone that burst from the tip of her tail.
The full dragoness snarled and hissed loudly, still in the throes of orgasm. Just when it seemed that the huge black dragon was done changing another burst of size surged through her body. Her length doubled up again, completely destroying the entire frame of her house as she burst out of the rubble lying on her back and convulsing in lust, clawed toes curled, reptilian cloaca dripping with thick streams of warm clear fluid. Her shape became rougher, her musculature grew dramatically. More spines erupted down her back in neat rows, her wings stretched and became bat like in shape and she became more fearsome looking. Smoke began to billow from her nostrils as her fire lit inside of her belly. Around Mary tiny humans screamed in terror and ran for their lives as her enormous 64 long body completely knocked over the neighboring houses like they were nothing at all, throwing debris and killing several people.
Mary winced and let out one last guttural cry of pleasure as she experienced her final tremendous growth that quadrupled her to a titanic 256 feet long in just several seconds. Mary if she could be called by her human name anymore slowly stopped convulsing as her size stopped increasing and her transformation subsided along with her orgasm. Energy surged through her and she flipped over from her back and got to her feet, stomping out half a city block with her enormous feet. She stretched her wings to their full 512-foot span and looked herself over, snarling proudly and grinning at her new 256 foot long and 9,865 ton body. She looked down at her feet and saw tiny dots that must be little human beings. How pathetic they looked, scurrying about in panicked mobs among their little city. Mary growled and lumbered forward, hissing in laughter as her bulk shook the ground and threw waves of destruction and damage for hundreds of miles. It was amusing to think her supra-draconic form had once been one of these helpless little vermin. Entire buildings collapsed and fires began to blossom all around. Mary had gotten her wish, she was the most powerful creature in the entire world.
The box of vials was well out of her mind as she flapped her enormous wings and got airborne. She would need a place to live now.