With one final thrust, Claire came. Her first male orgasm resulted in a loud bray, her face having finished its change into a complete donkey muzzle while she had been fucking Rebecca. She pulled out of Rebecca's still human slit, and let her cock sway in the cool air. Though she just came, Claire was eager for more. But the female before her wasn't ready.
Rebecca had crumpled to the ground as soon as Claire pulled out, and then wasted no time to squirm away from the shemale donkey. Terrified and humiliated, Rebecca curled into the fetal position, tears steaming down her face. She had just been raped by a donkey. By a half donkey, half shemale creature. And what was worse, Rebecca knew that it wouldn't be long until she started looking like Claire too. Her eyes were transfixed on the transformation playing out in front of her, knowing that was her future.
More and more gray-brown hairs sprouted on Claire's body. It was long before her human skin was lost in a sea of donkey fur. The hair on the top of Claire's head darkened until it was black. Thicker, and longer hair grew on the back of her neck, slowly becoming a proper mane. And as her mane grew, Claire's neck lengthened. Stretching until it was the right size for a donkey.
While her upper body changed, Claire's legs had thickened. Already on hooves, her legs reshaped themselves so they could support her growing body. Her stomach barreled out, as did her thighs. Soon each looked like they were over inflated, and covered in fur. Claire brayed in lust as her scrotum became hairy.
Completely stunned by the spectacle before her, Rebecca didn't even notice her own body was changing. Her ears slowly drew away from her head, migrating to the top of her head and becoming furred. Long ears flicked mindlessly, as Rebecca was hypnotized by the sight of her friend turning into a male donkey. She only realized something was wrong when Claire brayed again, and it sounded much louder than before. Rebecca's hands went up to cover her ears, only to discover they weren't where they should be.
While she felt her new ears, Rebecca shifted her position on the ground. There was an odd pain coming from her ass. Like someone had stuffed it into a pair of pants too small. Rebecca looked back, and gasped when she saw a nub extending from her tailbone. What would eventually become a donkey tail.
Below that, she saw the edge of something black and thick. Morbid curiosity took hold, and Rebecca probed underneath her growing tail. She gasped again, this time more out of pleasure. Her once small girl asshole was now a donkey hole. Puckered outward, and large enough for Rebecca to insert three of her fingers inside with no problem.
"Oh gawwwwd." she moaned as she pushed in fingers in deeper, and deeper.
Claire's attention was drawn away from her changing body when Rebecca started moaning. Was the female ready now? Claire walked up behind the female on all fours. Her hands had turned into thick masses. Her fingers were melting together, and her bones were adjusting. It wouldn't be long before Claire was on four hooves.
Claire lowered her long neck down to sniff Rebecca's new pucker. As Claire snorted hot air onto it, Rebecca was overcome. The lust triggered the next change, and Rebecca suddenly became quite aware of the puddle underneath her. That, and the squishy thing pressing against her thighs.
Spreading her legs, Rebecca was stunned to see her pussy had engorged to a ridiculous size. Well, ridiculous for a human, not a donkey. They had yet to gain that signature donkey shape or smell, but Rebecca's lips were definitely not human anymore. Her labia were too big and rubbery. And her entire crotch area was covered in wetness. There were splotches of black as the skin of her pussy was slowly changing color and texture. Her lips were so large, it looked more like she had a very small scrotum.
Seeing as Rebecca's legs were spread already, Claire nuzzled her nose into Rebecca's quiver snatch. Rebecca's eyes rolled into her head as Claire started eating her out. Her pussy began to clench and unclench, allowing Claire to dart her thick tongue in and out. The sensation was heightened as Rebecca's body grew. Her tail had finished growing, and its tasseled end lashed about on the ground.
Claire's own body was almost entirely donkey now. Her breasts slowly shrunk, and then migrated down between her back legs. Her hands were covered in black keratin, and were almost finished reshaping into hooves. And Claire's own asshole had completed its change to a proper donkey hole. She, more like he now, wasn't even aware that ever so often, Claire would make loud smelly farts. Rebecca was aware though. And to her disgust, she found the smells to be increasingly attractive.