"This isn't what I had in mind Kayla!"
"Hey you said riding, this counts!"
As they spoke Lily stabilised her self, hanging below Fey's barrel, the ground rushing past beneath her as the centaur trotted down the road. Lily bit her lip in concentration and dextrously moved her fat otter tail, touching the tip up against Fey's large horse sheath and then poking the tip inside. Fey nearly stumbled, her hooves clitter clattering against the stone as her gait became uneven.
"H-hey!"
The tail didn't stop and pushed around inside Fey's sheath as she continued to walk. The sensation didn't take long to produce results and the intruding tail was gradually pushed out of the sheath by Fey's growing swelling erection. The fat shaft slipped downwards hanging from her hips, swaying back and forth as she trotted, that is until the otterkin's tail began stroking and touching it, teasing and tickling the length, coaxing it into growing larger, which the length seemed very happy to comply with.
As it grew bigger and harder Lily's feet touched up against it, her soles grasping the length and jerking it off, the loose skin rolling in waves beneath her pumping feet. The cock gradually stiffened until her feet could shift the taut skin less easily, although that didn't stop Lily from doing her best to give the centaur a walking foot job.
By the time the horse cock was fully erect Lily's eyes were large and round. "H-holy shit, it's even bigger than before…" She bit her lip as the eager twitching length jerked up against her, its thick vascular straining length like a third leg between her own, no, larger, the broad knobbled had of the massive thing was wider than a hoof and completely outsized her petite pussy. The monstrous blunt surface jerked up and the otterkin gasped as its heat touched up against her inner thighs.
The moment the massive dick touched her pussy she went from merely damp to dripping wet with arousal. Multiple long slippery strands of femlube dangled down messily from her swollen slit, the lengths snapping into droplets that pitter-pattered on the cobble far below leaving a dark spotted trail In the centaur's wake. Each ridge of the massive head that dragged across her folds made the otterkin ever more needy, bumping up against her pulsing clit and smearing her lips apart dredging more and more of her fluids from her folds to rain down on the cobble below.
The raw physical sensation of being pinned against the massive masculine length was driving the cock starved otterkin over the edge, her body desperately pining for more, MORE. She couldn't stop her body from bucking of its own volition, instinctively rocking back and forth over the tip, her hips rolling like a ship in a storm.
Her pussy grasped at the air, her swollen lips moving, glistening with her slick juices, practically slurping at the dick as her folds were pressed ever harder against the broad head. Her drooling sloppy muff slopped over the tip's surface sending rivulets of herself to darken the head and run down the outer crevices to drip over and over from its lowest point.
As she wiggled herself on it she could feel Kayla moving the rope above her, dragging it backwards, helping her shove her needy greedy pussy ever harder against the massively outsized dick. She whined out a little thank you to her sister as the pressure increased against her groin.
Kayla suddenly jerked back hard on the rope above her, heaving back on it. Lily yelped as she was rammed up against the cock, her boiling puffy muff squished flat by the impossibly wide head. Her hips and legs strained over the mass, her whole body bent toward the task of getting that massive thing inside of herself, straining, pushing, grinding, and then, at least, she succeeded.
Schl-plop!
"AIIIEEEEEEE!" howled the otterkin.
Lily's lowerlips stretched impossibly obscenely wide in a thigh thick tight O shape, her folds stretched paper-thin over the vast member. Her bawling cunt slobbering over the length as it was filled and stretched to her absolute limit sending the otterkin wild.
A clear spraying steaming splash of girlcum sprayed from her overtaxed pussy, noisily splattering on the cobblestones below and creating instant puddles in the centaur's wake. The otterkin girl clutched at the bulge in her abdomen outlining the massive thigh thick dick bulging out her belly, defining the slightly flared head of it in relief.
"So- b-big, so… feral!" moaned Lily. As starbursts of pleasure bloomed in her mind, fiery plumes of ecstasy that sent shivering pulsing heat rolling up and down her body. She felt like she was falling, a weightless blissful feeling, or perhaps that was just the illusion of hanging as the ground raced by beneath her, it didn't matter, she felt light, like something she hadn't known she'd been missing had been filled. She belonged on Fey's dick, she wasn't just a centaur's little cocksleeve, she was the centaur's little cock sleeve. She was the small feminine cap on the intense VAST masculine stallion presence, a receptacle for its gushing endless output to be filled and inflated forever.