As the car road along the road, the Eversons none the wiser as to what occurred, Henry began to notice a pressure within his bowls *PFFT*, a fart escaped from his ass much to the disgust of his daughter, and laughter of his sons "Henry!" Linda exclaimed "Natural bodily function honey." "That doesn't, oh..." Linda suddenly felt pressure build in her own body *prrrrrrrrvt* "Oh excuse me." She responded as her son's laughed, a smile creeping upon her husbands face "Looks like I'm not the only one with gas.
It wasn't long until another *flurpppppp* sounded from Henry, elating yet more laughter from Rick and Sam, perhaps to much but by this point even Debra was beginning to enjoy herself when both she and her brother's felt a growing pressure *verrrrrrrrt* another trumpet sounded from the children. "Oh goodness that was loud." Linda stated "But its nothing compared to this." she finished as she purposely released her gas, farting with a loud *VERRRRRRRRRTT* never noticing the rainbow colored gas escaping.
"That's a good one honey, but try this on for size." Henry responded, his cock growing hard, and just plain growing. *Flurpppppppp* another rainbow fart erupted from his exposed ass, horse tail swishing about. Soon the fart grew wet, and was quickly followed rainbow colored shit exiting Henry's equine bubble butt and landing in the floor of near Ricks feet. Before anyone could fully process this Lynard let out another *Prrrrrvt* soon followed by his own log of rainbow shit.
"Its nice to let it all out, isn't deer." Lynard stated as he grabbed a hold of his growing cock as it began to shift shape "You've got that right dad." Dillion stated as he let out his own *Fuuuuurrrrrtt* before filling the car sit with steaming shit, it wasn't long before Rick and Sam did the same. This went on for quite some time, rainbow farts filling the air and rainbow shit the car seats and floor, their transformation entirely unnoticed.
Lynard and Dillions chests fully flattened, everyone's nipples growing larger, with Henry and Sam's even gaining piercings. Cocks growing ludicrously large and equine, Dillon's secret clit piercing turning into an albert pierce, well known and parent approved/encouraged. Soon laughter turned into moans of delight as the rush of scat across the prostate bought pleasure to the Eversons. Faces grew long, feet became gold colored hoves with matching gold horse shoes, fur of various colors, from Henry's white, to Lynard's blue and Dillions pink grew upon their strong bodies. Hair shifted and lengthened into rainbow mains, and by this point the pleasure they felt had brought them to the edge.
As the car and even the road grew in size to account for their new size, their spare clothes in the trunk disappeared, turning into porn and sex toys. One last feature was left for the Eversons, as horns began to spiral out from a top their heads, elating a sense of pleasure rather than pain. The family left as little more than a moaning mess masterbaited without shame, rubbing their hands up and down their massive members. With a single triumphant moan and *VERRRRRRTTT* sounding from all five rope after rope of cum came shooting out from their dicks, coating the seats, walls, doors, floors, and ceiling in unicorn seed.
"Ah, that felt goooood." Henry stated as he made sure his seed went into the floor so he could see the road *PFFT* "You could say that again." Lynard added "Hey pops, dad, when's the next stop, I really need to stretch." Dillion asked "Yeah me too." Responded Rick "I'm hungry." Sam added. "Well lets check the GPS." Henry replied as he pressed a button on the counsel, revealing a piece of paper embedded into the dash. The map on the paper shifted and changed, tracking the Eversons position, Henry's horn glowed a bit and rerouted the maps directions to the nearest stop "There, it'll just be a few minutes." He stated "Good thing." Dillion replied "I suppose I could use a stretch too, especially in my ass." Lynard added, elating a bout of laughter from everyone.