You'd be lying if you said your ass wasn't itching for some more action after being reamed by Tommy earlier. Plus, Jenny's horsecock was just so... perfect. Perfect size length, perfect girth, perfect hefty squeezable balls. The sight of an ooze of pre glooping from her piss-slit made your mouth water.
You gave your older sister a smile. "Sure, Jen. I'd be down for a good fuck right now, haha!"
Jen beamed and leaned over to hug you. "Thank you Ben! I can feel your ass already! C'mon, let's head up to my room."
The two of you gave one last look to your dad being pounded by the biggest horsecock on Earth before turning and making your way upstairs. Even with how your house was expanded, you still had to climb the stairs one at a time. You instinctively went first, allowing Jenny a tantalizing view at your huge juicy donut hole and big swinging nuts.
The soft moan you heard behind you confirmed she enjoyed the sight.
Finally, your hooves clopped onto the carpet of the 2nd level of the house, and you and your sister eagerly made way to her room. Cantering inside, you stopped at the open space in front of her bed, aiming your big furry gray butt right at your sister's door. Shifting your tail aside, you looked back at her with a smirk as she stared hungrily at your backdoor.
"What's the matter, Jen?" you teased. "Don't think you can handle all this ass?"
It was corny, but effective.
Jenny's cock throbbed upward under her and a glob of pre shot out onto her carpet. Her face was flushed with horniness as one-by-one her hooves clopped on the floor, bringing her closer and closer.
However, instead of just mounting you like an animal, once reaching your location Jenny reached down and grabbed your large sweaty balls with both hands, lifting them toward her. You cooed as she started to squeeze and knead them, caressing the taut flesh with her thumbs and attempting to churn up the seed inside. She then surprisingly leaned forward and pressed her lips to your bulbous equine sphincter. You couldn't help but moan as she swirled her tongue around the ring of the donut, occasionally dipping the tongue inside and getting a thorough taste of your back door.
Your sister huffed as she finally pulled her face back, eyes glazed with lust.
"You have such a strong scent, Ben," she panted. "Your asshole begs to be fucked."
You chuckled at how overwritten her mind was with carnal desire. As much as women like to tease men by saying they think with their dicks, that's exactly what Jenny was doing.
The moment had arrived.
Your sister released her vise-like grip on your nuts, letting them heavily flop back down and leaving them swaying to and fro. Without any more hesitation, she lifted up her forelegs and mounted you.
You managed to withstand the added weight of your sister's entire stallion body laying atop you. Just as you felt the flared tip of her schlong brush against your backdoor, you gasped as it was suddenly and unceremoniously thrust inside.
"Uhhhhhhhfffffffuck!" you groaned as Jenny's entire horsemeat was buried in your guts to the base.
You felt Jenny's large perky tits pressed up against your back. Her slender toned arms slid under your own and wrapped around your chest from behind.
SCHLAP SCHLAP SCHLAP SCHLAP SCHLAP SCHLAP
She immediately initiated a rhythm in fucking you, her full hefty balls slapping against your own with each thrust.
"Mmmmmm, thanks bro," she growled in your ear. "I love how readily you offer yourself to me. You're almost as much of a slut as Tommy, haha."
"Mmhh! What about dad?" you asked coyly.
Jenny chuckled. "Nobody on Earth is as big of a slut as him, that hairy little mare."
Just as she was beginning to really pound the daylights out of you, the door to her bedroom opened.
Standing in the doorway, grinning ear-to-ear, was her boyfriend Brandon.
"Now how did I know you'd be in here, fucking your brother?" he teased.
"Baaaaaabe!" Jenny cheered, instantly dismounting you causing her fat horsedong to slide out of you with a SCHLOOOOORP! The entire pillar of sexmeat swung around wildly as she turned to face her boyfriend.
The two of them embraced, Brandon's head only going up to the top of Jenny's abdomen. Releasing the hug, Brandon looked under his girlfriend and noticed her throbbing leaking cock.
"Say Ben?" he began. "You don't mind me taking over, do you? You know, since I'm her boyfriend and all."
"No, not at all," you replied, curious to see where this was going.
Jenny stayed still, allowing her lover to walk around her side before he crouched down next to her desperate genitalia. Your sister sighed as he grabbed her schlong with one hand and her balls with the other and started to stroke her up and down.
"Yeah, you really need this, don't you babe?" he quipped, enjoying the shivering of the great beastly body above him as he worked the dick masterfully.
"You have NO idea, babe," Jenny cooed in response.
You weren't gonna lie, you were pretty disappointed. Hot centaur sex interrupted for a handjob? You could do better than that.
Racking your brain for ideas, you finally settled on one that would uniquely include Brandon in your family's equine fun.
The hunky boy mindlessly released your sister's schlong, stood up, and walked to the remaining open space in the bedroom.
Just in time too, as his ass exploded out of his pants like your mom's did earlier. He shot upward in height as he gained a horse's body below the waist, but that wasn't all.
As his ass expanded backward and formed into a horse's body, it split in two down the middle. As his morph finalized, you took in the strange form Brandon had assumed.
The new centaur shifted idly on his six legs. From the front, he looked like your regular every-day centaur. However, midway down his lower body, his horse-form splits into two juicy mare asses. You and Jenny stared at his massive meaty leaking equine pussies, their juices glistening in the bedroom light.
Brandon had a cream-colored coat of fur, with reddish-brown tails that swished side-to-side above his asses.
"Well? Are you guys gonna just stand there or are you gonna fuck me?" he asked with a smirk.
"Of course, babe," Jenny answered. "You're just so hot. My brother and I can't help but stare."
"Well, you guys can stare later, my pussies need you guys so bad!"
You and Jenny were similarly horny, of course, and eagerly clopped your way over to him. You walked up behind his left ass, and Jenny his right.
"Oh, by the way, Ben," Brandon began. "Jenny impregnated my left pussy last week, so feel free to cum in it all you want." He winked at you.
Jenny giggled. "Oh yeah, I still need to pump a foal into your right pussy, don't I?"
"No time like the present, babe!"
The two of them shared a laugh, followed by your sister immediately mounting her boyfriend. Even at its size, her horsecock had no trouble penetrating Brandon's mare-gina, quickly sliding in balls-deep to a cacophony of loud wet squelching sounds.
You needed to get in on this. Literally.
Raising yourself up on your haunches, you had to drape your right foreleg over Jenny's horseback due to the lack of space as you too mounted her boyfriend. Since Brandon's asses merged into one horseback, it forced you and Jenny to be essentially atop one another to allow you both to penetrate him. Not that you minded.
You gripped Jenny's waist, and Jenny gripped Brandon's waist, and all three of you moaned as your three-way began.
Brandon's pussy felt incredible. Being a mare-pussy, it was designed to take your cock, even more than an asshole was. It gripped, massaged, and pulsated around your shaft as it seemingly knowingly pleasured you with its heat and its moisture.
The room was filled with a doubled slapping sound as both yours and Jenny's balls collided with Brandon's sweaty taints. His small horse-tits jostled between his rear legs from the force.
Thanks to the sex you and Jenny had already been having, both of you didn't last very long.
Jenny came first, slamming herself into her lover one last time. You could hear the splurts of her semen as they fired into his womb, potentially inseminating him... again.
The hot sounds of your sister having another stallion orgasm sent you over the edge, and you groaned as your own horse-cream filled Brandon's left equine uterus. Your nuts clenched up under your hindlegs as they unloaded their contents into the double-assed mare-boy.
They joy of being filled with cum by two stallions at once sent Brandon into climax, as well. He cried out femininely as his golf-ball-sized equine clits squirted probably a quart of lovejuice onto you and your sister's testicles. The juices flowed down your huge smooth scrotums before dripping off onto the floor.
The three of you panted heavily as you basked in your shared afterglow.
You dismounted first, schlurping your cock from Brandon's gushing pussy. Jenny did the same.
Without a word, both of them made their way over to Jenny's bed, which had been retroactively altered by your morphs into being large enough for several centaurs, as well as capable of withstanding their weight.
They both laid down sideways on the bed, and Jenny surprisingly was the little spoon.
A nap did sound good right now, especially after all the equine sex you'd had.
Climbing onto her bed yourself, you laid down behind Brandon, making him a little spoon, as well. The three of you sighed in contentment, and gradually drifted off to sleep.
What happens next?
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