"Laura let me see the remote." Asked Erika, putting one hand out to her friend for the exchange.
"What? No way! Your going to use it to get revenge on me or something!" Laura protested, clutching the remote in both hands and hiding it behind her bloated stomach.
"You toyed with me! It's only fare I get to do something to you. I'm not going to do anything that you can't undo. And I promise it'll be fun."
"Alright..." Laura replied after a hesitant pause. She slowly flew over to Erika and placed the itty-bitty remote into the centaurs hand, the remote no larger then a grain of rice in her palm. Luckily it grew to size, un-shrinking until it was to scale for Erika's use.
Erika examined the controls and with guidance and explanation from Laura began to enact her changes, all of which she withheld from Laura.
She first wished her mother and father switched their genders back to their originals. Instantly Erika's mother was humping air as her dick disappeared and reappeared underneath her fathers hind legs. As her mother dismounted from her father Erika then wished that fairy Laura and her mother would swap their minds, placing Laura in her mothers matured mare centaur body and her mother in the bloated fairy body hovering about.
Laura bewildered by the sudden shift pranced about in place learning how to use her four new limbs, clutching her larger breasts, trying to understand her new face, one hand pawing at her cheeks and nose.
Erika's father, still horny from the interrupted sex had began to circle around Laura in his wife's body, ready to continue their session. However Erika had other planes, she wished her father would be dismissed somewhere else in the house. Like a hypnotized zombie he trotted out of the living space and out of site.
Not wasting time Erika continued her work. She placed a wish upon herself and made changes looking to Laura in her mothers body and reaching out to give her a slap on the ass! "Ahhh!" She screamed her back legs kicking out in surprise, missing Erika but making a good show of her centaur horse body.
"Pay attention Laura..." Erika said as the remote beeped to her wish. Erika's centaur half began to change; growing more muscular and bulky. Her frame thickening and broadening. Her human body oddly stayed the same atop the goliath horse body. Her hooves became enveloped in white flowing fur and hooves themselves became gigantic by horse standards. Laura swore she heard the floor creaking from the growing weight of the clydesdale centaur Erika had made herself, her human body arched forward, her head now braced against the ceiling looming over her. "Damn Erika! Your huge!" Laura stammered.
"Oh that's not all, take a look." Erika commented, pointing under herself. The impressive girth of her horsecock swelled like her body had, becoming thick as a two liter bottle and nearly doubling in length. "Oh jesus that feels good. Mmmmm" Erika moaned as the shaft reached its peak, but she continued with the remote.
"I wish my mother would become my next load." She said calmly as though it was a perfectly normal thing to request. The remote beeped and Laura panicked for a moment since she was in the body of Erika's mother. Her horse hooves skittered on the floor trying to flee, but she stopped when she spotted the fluttering shape of her bloated fairy body zip around the Clydesdale body and then (practically) dive down the engorged urithra of Erika's horse cock! Erika moaned again, much louder. Her horse legs trotting in place as though spasming. The bulge that was Laura's body slinked down the shaft before reaching her large hanging sack, it bloated slightly as her mother finished her trip and presumably became a glob of cum waiting to be released.
"Hey! Erika, what the hell! That's my body! Give it back!" Laura shouted in fury! She turned around and gave a punch to the chest of Erika's lower body in protest! She regretted it though, the muscular slab of meat that was the powerful draft horses bulk felt like hitting dry wall.
"I was planning on doing just that Laura, after I wish your body could stretch to handle my size..."
Laura shivered as the familiar empty feeling overtook her once more. Briefly stunned by it she snapped to when the loud *clop* *clop* of hooves on either side of her. Erika loomed behind and above her the huge frame of the draft horse dwarfing her own.
Erika waisted no time entering the stretchy mare pussy of her recently centaur-ified mother, currently possessed by her best friend. The huge shaft slid in effortlessly thanks to the wish but was so tight she could feel ever vain and ridge of her gargantuan horse cock being squired by the elastic walls.
Laura for her part let out erotic cries. "Ahhfuckahhfuckahhfuuuuuucckk!!!!" She moaned. "Erika! Your soooo big! Jesus! What did you do to me?" Each thrust caused Laura's horse stomach to bulge and retract! The thick cylinder shaft and flat head tightly outlined in her furred body.
"Nothing yet, but I do wish that once I cum into you, you'll become pregnant with your own centaur body and give birth to yourself as your mind and my mothers return to their respected bodies!"
Erika then thrust harder into her mothers body! Laure under the relentless pounding fell on her front honchos, as pre-cum began to leak from the flared flat cock head buried in her horse abdomen.
"Fuck Erika! Ahhh! Knocking... mmmm! Knocking up your own... *gasp* ...your own mother with your best-friends.... Ahhh fuck! Best-friends body? That's twisted!" Laura stammered as the equine length of Erika's cock pulled out then back into her!
"More twisted *pant* then gender swapping a whole... fuck your so tight... a whole family and making them *gasp* centaurs?" Erika countered.
"FUCK YESS!!!!" Laura screamed as then the entirety of Erika's massive cock bottomed out, stretching her elastic womb across her insides! Laura cam hard clamping her enlarged and drawn out muscles across the thick member within her. Erika gave only two more deep pumps before she came too flooding the body of her mother with a torrent of cum! Cum that only a few minutes ago was Laura's fairy body!
The two moaned with the release and Erika watched with satisfaction as the elastic body of her mother swelled like a ballon from her ejaculation. She'd not even pulled out yet and already her mothers body was pregnant with Laura's new centaur body.
For Laura things got weird. Well, weirder. First thing she knew she was having the most mind numbing intense orgasim of her life and then her vision began to blacken around the edges moving inward until she couldn't see anything. Suddenly she was very wet. Turned on yes but not that kind of wet. She was soaked head to toe in some kind of thick n slick fluid. Next was the sensation she was larger then she should be, limbs beneath her stronger then her usual legs, and more of them. She'd not forgotten what Erika had said would happen, bit in the dark and confusion of shifting bodies it was still disorienting.
Another sensation occurring around her was movement. Something big was radiating heat, it seemed to be above her and running the length of her new body. Thinking quick she flailed about it and wrapped her arms while flipping her body around the hot structure , noting that it pulsed and further down its length some kind of current of the slick fluid surrounding here was flowing.
There was rapid movement and she felt the tight confines containing her rush around her body and the hot firm cylinder she coiled to. The tight space suddenly grew tighter and she was aware of a woman's muffled moans nearby. As the walls around her contracted and stretched over her body she could suddenly for the first time see light, the moans turning into climactic sensual screams.
As she'd suspected she'd been holding into Erika's gargantuan cock inside her (their?) mothers womb, using it as a free ride down and out to her birth as Erika pulled out.
She was utterly coated in cum, again as she'd suspected, though now in the open air it was beginning to dry and losing its slickness becoming sticky and gunky. Laura began to stand on her "newborn" shaky legs despite being a fully grown centaur as per the remote instructions.
"Damn Erika! I didn't know you were such a freak!" Laura said to her friend (Father? Sister???) as she tried to slick the cum off her body. "What else you got?"