“Surprise!” All five of Whitney’s friends shouted in unison as the door to her bedroom flung open, the girls lining the side of her bed as the blonde-haired girl sat there nonplussed, “Happy birthday!”
Ginger, a petite black girl just a month older than Whitney, did the honors of holding out a small cake they’d baked from scratch. A “1” and “0” candle sat in the center of it alight, a crudely drawn grey blob of a donkey scribbled just underneath it in frosting. Whitney scrunched her face, blushing furiously as she stared at the animal scrawled in icing; the thing she was close to turning into.
“You girls… aren’t supposed to be here.” Whitney’s voice squeaked out in a calm whimper that was laced with nervous energy. Her best friend Ginger nudged the cake towards her, setting it over cross the bump of her lap underneath the bed sheets. The sick girl’s face blazed an even deeper red, a lurid puff of super-heated breath steaming out of her maw. “You guys might catch Donkey Pox too. Don’t you remember a week ago at school? I was so close to going full Donkey that I was on all fours and braying!”
“Hey, you only turn 10 once!” Ginger countered with a smile. “Besides, after that outburst a week ago, you can’t blame us for being teensy-bit curious! And you got better too, right?”
“Y-yeah, I’m getting better! The doctor says just a day or so longer without any flare-ups and I’ll never have to worry about this again. There’s… still a bit of me that’s pretty donkey-y though.” Whitney corrected her. “I’m not fully cured yet though; mom and dad are worried if any of my friends are around it could flare up again! They think me being around you is why it got so bad so quick back then.”
“Yeah, and it got better.” Courtney repeated Ginger’s point, taking a step forward and stroking the sick girl along her arm. “Was it fun being like that? It looked like you were having fun.”
“I don’t remember and – Hey!” Whitney whipped her arm away from her friend, the cake on her lap shuddered as she jerked herself to the side. “Don’t touch me! You girls being around… it…” The girl quivers a little, that cake on her lap tipping even more. “It… just makes things worse! You’re gonna catch it too and… you’re gonna make me change again.”
The five other girls giggled, Ginger sneaking up to Whitney along the other side, hand stroking across the back of her neck.
“S-stop iiit!” Whitney’s voice fizzled in a vocal fry, vision getting a little blurry as blood from her brain started to pool somewhere else.
“Like Courtney said, you’ve got us curious!” Ginger giggled, still petting her back as Whitney shivered. “I think nature herself gifted you with an awesome birthday game we can play! Besides… you do smell kinda good in a weird way too.”
“Kliiiissh!”
The cake dish splattered to the floor. It was knocked off Whitney’s lap, a growing bulge prying up the bedsheets the culprit. It was coming from Whitney’s lap.
“I-I’ve gotta go!” Whitney cried as she flung up the bed covers, her friends getting a brief glimpse of her panties stretching, hardly holding on to the burgeoning mass of meat swelling underneath that thin fabric. She bolted away from Courtney, twirling around her other friends like a football running back, so close to reach the door until a kink in her ankle sent her toppling towards the ground, Whitney realizing she landed on something… soft.
“Ginger…” The girl huffed, hot air steaming from her nostrils as her belly lay a top Ginger’s back, she must have fallen right over top her! Now both were on the oaken bedroom floor on all fours. Whitney grit her teeth, fighting to jerk herself back up on two legs, but her stance felt solid like this, motion in her hands and feet waning… hardening.
“Please, help me up!” Whitney yelled, throwing her head up, “Please! I can’t be on all fours! That makes it worse and-!”
Whitney gulped, almost choking on her spit as she felt someone push her down further, hands reaching underneath her T-shirt, dragging them up her back and tugging the shirt upwards.
“I bet it feels good though, huh?” Another of her friends, Vashti, a caramel-skinned Indian girl massaged her bare back and forth before kneeling behind her, fingers dipping underneath the straps of her panties, tugging them down. “OOooo… still have this, huh?”
Now that her undergarments were stripped off, the girls could finally get a look at the extent of their friend’s changes. Indeed, she was pretty close to full-human once again, she still had her vagina too. All that was left of her donkey-self was some greyish peach-fuzz tickling her underbelly… and a more noticeable addition.
A big, black sheath made of velveteen leather rubbed just above the hemming of Ginger’s jeans. The black girl pulled a hand back to unbutton her pants before tugging them and her underwear down in one smooth motion, leaving nothing in the way now. Bare, donkey cock-cage mashed against Ginger’s chocolate human skin. It squashed and squelched against the girl’s ass, hot, clear liquid oozing out the tip, dribbling down the blemish-less skin towards her butt crack.
The two girls shivered in unison. The sweet, sugary scent of birthday cake emanating through the room started to mix in with a morish musk of obnoxious donkey stink. Now that her sheath was free of her underwear, Whitney’s friend were struck by it all at the same time. Their pupils grew dilated as their breathing quickened. Courtney tugged off her jeans, leaving her bottom half bare as her other two friends, Abigail and June, knelt down on either side of her pressing their heads close to the tight junction of donkey sheath and girl ass, just to get a better smell.
“It’s your birthday~” Ginger’s voice slurred like her lips were soaked in syrup, her bare ass nudging upwards little my little as that throbbing monster locked inside that donkey sheath stabbed harder between the black girl’s butt cheeks. “Nothing to worry about! We can change back later. Just have fun! Have fun with me~”
“StoooAHHP!” Whitney squealed out a high bitched bellow, feeling what Vashti was doing behind her. The otherwise vegetarian girl stuffed her face full of girl flesh, making out with that lush pair of blushing pink pussy lips that Whitney still had. Something had gotten into her friends, that bestial lure of musky donkey smut reeling them in closer. A tongue was passionately French kissing her pussy, the two girls aside her nipping and lapping as that scorching-hot tube of equine maleness as Ginger’s butt begged for her best friend to get to fourth base.
Whitney tried her best to blurt out for them to stop again, but even she could feel that miasma of her own lascivious donkey pheromone whipping at the sex-centers of her young mind. Her voice plugged up as Courtny straddled Ginger and pressed her butt right against Whtiney’s face, muzzling the girl’s mouth with her own pair of swollen pussy lips.
The donkey pox patient writhed atop her best friend, hands and feet clashing against the wooden floor as soft human soles solidified into fumbling, onyx-black donkey hooves. But it wasn’t just her.
Ginger muffed out heaving puffs of air, her own feet creaking and churning into donkey hooves as the two sets clattered against one another. Whitney’s hooves no longer touched the floor, the birthday girl’s maw huffing in a blast of pussy goop from her friend as she felt Ginger’s smooth back against her own hair-less chest start to grow furry.
She was changing rapidly. Ginger’s body felt like Jell-o, bones and fat flowed like hot butter in a pan just underneath his skin as that too grew more course, black fur overtaking her human hair follicles as she bulked up with bestial mass.
Ginger herself didn’t seem to know what to do, she’d fallen into a vortex of change; no way to get out, the only way was going further. She’d tossed away her humanity to join in a birthday game, the body she’d known through her entire ten years of life blissfully melting into something irrationally big, bulbus and needy.
“Good donkey, good girl!” Courtney cooed giddily as Whitney’s lengthening tongue ticklishly slurped inside her. Both her and the birthday girl now sat astride Ginger, Courtney’s girl honey dribbling along that black donkey hide as she reached down to stroke her lengthening neck. “The grown-ups that said that Donkey Pox was bad were all wrong! I bet it feels amazing!”
“Oh g-god… frick…” Ginger squealed from her thick tongue, the girl biting her fattening bottom lip as vocal cords stretched in a way that’d leave her speechless in a matter of seconds. It must have felt amazing, her small human body growing into something strong and fertile – made to have all sorts of lewd fun!
“Just like we talked about! It’d be like an infinite snow day!” Courtney lavished the back of Ginger’s neck with a kiss as it grew upwards and out, a dark, scrubby mane shooting out along her spine as two leaf-like ears shot up from her scalp. “No school, no church, no chores for as long as we want! Just donkey boys and donkey babies!”
Inside Whitney’s steaming brain she tried to reason how long they’d want to stay as donkeys. Babies? That’d take a while, wouldn’t it?
Ginger lashed underneath the two girls, like her donkey half and whatever remained of her human half were wrestling inside. She seemed to realize it’d take years, weeks and months as an animal in a pasture, foals nursing from her udders… studs hammering away at her feral cunt.
Whitney felt Ginger’s thin belly obnoxiously explode out into asinine proportions, her butt fitfully fattening to the size of an over-blown beach ball as a tail burst from her extending spine. Vashti switched from Whitney’s ass to Ginger’s, her face stuffed between those two lard-filled buns of mare ass as she tugged one of Ginger’s labial lips into her mouth to suckle. They were still human… but not for long.
“Boys to rut you all the time! Big strong donkey boys!” Courtney whispered into Ginger’s feral ears like Wormtongue, the allure of donkey sex heavy in the air hypnotizing the both of them. The almost-donkey girl bobbing her big head in agreement as her face pushed out into a muzzle, big blocky teeth clamping down on her black, rubbery horse lips before she threw her head back and wailed.
“Gawwwd! Hot! T-too hAWWWWT!”
Her mellifluous human voice transmogrified into a harsh bray! Behind her, a bucket’s worth of mare cum nearly drowned Vashti as she ate away at her transforming sex. Those dainty, pouting human lips flared out to the size of meaty sausage-sized inner tubes. Her pussy lips got so big they pried Vashti’s lips off them, Ginger throwing her hips back as Vashti’s head withdrew, almost swallowing the Indian girl’s face whole! Inside that fleshy prison of mare ass, the lust-addled Vashti bit and lapped and nibbled away at that rubber-like jenny pussy, her tongue lashing at her bestial clit as she wrapped her lips around it, feeling it pulse bigger and fatter until it was the size of a jawbreaker!
Underneath Ginger’s belly, her human boobs bulked up with soft, blackening flesh, Abigail and June with switching their attention from Whitney’s sheath to love on those nascent donkey udders. Both girls cupped those huge hemisphere of flesh as they glid down the broad donkey stomach, settling write between her drenched mare thighs as they suddenly puffed out with sloshy liquid inside. Both girls wrapped their lips around those baby-bottle-cap sized udders, tugging and nipping on them until they fattened into teats fit for Ginger and Whitney’s new foals.
The floor creaked under Ginger’s several-hundred-pound growth spurt. Ginger was no more, a fully grown two-and-a-half-year-old donkey mare stood in her place, leaking acrid mare-scented cum from her cunt as her still-human mate-to-be laid on top of her. A dopey feral grin covered her muzzle, Ginger embracing a simple animal mind as her over-sized jenny cunt winked against Vashti's face. Whitney was still huffing up Courtney’s ass as they both sat a top Ginger, mare heat and sweat intertwining with the cacophony of scents filling the room as if the newly minted donkey was urging her friends to join her in being livestock!