"Euughh... euughh. eeaahh..." Sophie gasped with each thrust, a rope of drool dripping from the corner of her mouth, squirming as the enormous shaft within her rammed in and out. Though all her inhibitions were now gone she was none the less increasingly aware that Buster was getting deeper each time he pushed into her. Though it only brought more pleasure Sophie could feel her innards rearranging to make room as her vagina deepened.
Her vision flashing white with pleasure Sophie came for the first time as Buster pressed against her rear, his cock at last fully sheathed within her. As he pulled back to make his next thrust the moonlight revealed the darkening flesh of Sophie's vagina as it rapidly lost its human shape, her folds pulsing as they thickened, turning dark and leathery.
The transformation soon spread from Sophie's now fully bovine pussy, blonde hairs beginning to coat her already bloated ass as it swelled to a truly inhuman size. The fat wobbled as it began to reshape "Euggghh... fuck! oh...fuck!....my... my.... ass!" Sophie gasped in delight at Buster excitedly thrust into her, her asshole expanding into a dark donut and a tail erupting from the tip of her spine, a blonde tuft of hair at its tip.
Struggling to hold her increasing weight, Sophie's leg shook as they began to bloat and thicken, the change spreading from her bovine rear as it reshaped her legs. As she felt her feet go numb Sophie looked down past her swaying breasts to see a pair of hooves where they had been, "Oh gosh... I'm.... uennnghh... gonna be a cow..." the thought voiced allowed was strangly appealing to her.
"Ughn, euhhh... mooahh" Sophie's aroused cries began to deepen as the transformation spread though her torso, her belly bloating as she grew a second stomach and her womb expanded. Gasping in air with powerful new lungs Sophie watched in a mixture of horror and lust as more and more hair coated her body and her heaving breasts began to move down her chest, finally settling in place between her legs, lightly pressing against her bovine thighs.
"Unnghh.. ughh! my.. moooobs" Sophie bellowed, cumming for a second time as her breasts pulsated and swelled, beginning to fuse. Within moments a single large mass heaved between Sophie's legs, unrecognizable as the breasts it had been, an udder for the soon to be cow. Distracted by her new appendage Sophie only noticed her arms had been reshaped into legs when she lost sensation in her hands as they hardened and twisted into hooves.
Buster's thrusts were becoming increasingly wild as Sophie swelled beneath him, driven to the edge by her cries his balls churned as he finally lost control and began to cum. "Muohhh... haaa... unggh" Sophie began to cum for a third time, her pussy greedily undulated as it milkied Buster's pulsing cock as thick ropes of cum began to pump into her.
The cum rapidly filling Sophie's womb only served to accelerate her mutation, her entire body swelling as she packed on more and more fat and muscle as she truly outgrew her once human form. Still cumming Sophie struggled to form words as she began to urge Buster on as he came "Moockk mee uppp! Mooakee meee aaa coowww!".
As her neck thickened the transformation finally reached Sophie's still human head "Moooahh.. moooo!" her vocal cords transformed Sophie could no longer speak as she felt horns sprout from the sides of her enlarging head. A fattening tongue hung from her mouth as her face pulled forward and her ears enlarged, soon the only trace of Sophie's old body were the blonde hairs atop her head.
After what felt like an eternity Buster withdrew with a wet plop from the cow beneath him, a thick stream of cum oozing from her still winking orifice as she collapsed. Satisfied the bull wandered over to the corner of the stall and lay down, his job complete.
Still panting Sophie lay akwardly collapsed as her mind raced "Oh fuck! oh fuck... what the hell just happened?" Glaring at Buster she weakly groaned in disapproval, all to aware she was likely pregnant with his calf and ashamed that she felt happy about it. Exhausted, Sophie couldn't stay mad at her now mate, her eyes soon grew heavy and she drifted off, the breathing of the two cows the only sound in the stall.
Blissfully unaware, Sophie's udder slowly swelled with milk as she slept, the strange power of the stone now imbued within the liquid, ready to move on to another host.