The feeling of Lily's cock on his back leaves him little choice.

Every time Lily's fat balls slapped into his pussy, James involuntarily sucked in small hiccups of breath. His step-sister's gigantic cock pressing into his ass and back felt so incredibly thick... and hot... and...

"Oh god, I want it, I need it, pleeeaaase put it in!" His mounting desire washed away his restraint, and he began humping his hips backwards, moaning uncontrollably as Lily's balls slapped against his squelching pussy. The fact that he couldn't see what Lily was doing added to his building anticipation.

"As you wish, my little cow," Lily replied, drawing back slowly, ponderously, sliding her oversized dick through the valley of James' ass until after what felt like an eternity, she slid the drooling tip down until it rested against James' fully parted lower lips. The blunt head felt incredibly huge against James' virgin pussy - the thought of being penetrated by the giant monster suddenly filling him with a hint of trepidation. But the prospect of being spread to his limits...

But before James could finish the thought, Lily let go of his hips with one hand and used the other to support her dick - and started to push forwards. James felt the flared head stretch his labia unbelievably wide, not quite painful, but also not far off. His eyes and mouth snapped open wide, breath catching in his throat. He couldn't breathe. He couldn't move. He could only focus on the sensations of the blunt end of Lily's cock spreading him open until, with an audible, squelching 'splurch' it slid into his quivering tunnel. But the enormous, trembling shaft Lily was now forcing into James' spasming snatch was almost as thick as the head.

James' whole body shook as his pussy clamped down hard around his step-sister's cock, mind going white with pleasure. A slurred, keening moo was all he could make as his pussy churned and frothed with his juices, coating Lily's monster liberally. His legs shook and twitched, toes curling, fingers clawing at the floor, and Lily was **** to pause her entry until James' orgasm had subsided enough for his cunt to relax.

"Wow, you really came just from putting it in," she marveled, "But I'm not done yet."

"Oh god, oh fuck, oh fuck, oh gaawwd," James babbled as his step-sister plumbed his depths. He could feel his folds slide over every bump, vein and of course the fat head inside of him, sliding deeper... and deeper... and deeper, his juices squirting and splurting out around the girthy rod. It was so deep inside that James felt he had to have taken half of it already!

"Hrrnn, your little cow pussy is so fucking tight!" Lily groaned, gripping her step-brother's hips with both hands for leverage. They felt so strong, sinking deep into his soft flesh... With one last, mighty pull, Lily jammed more of her cock into his snatch, its wide head pressing into the entrance to his womb. James couldn't believe he had actually taken Lily's whole cock!

"Oohnn, Lily, it's soo deeep," James moaned, his legs quivering and jiggling uncontrollably, arms barely able to keep him up, "You feel huge!"

"Oh, little cow, there is more to come," his step-sister promised, and James' eyes flew open in shock. This wasn't all?! Then what... the medial ring. He hadn't felt the medial ring enter him. A hint of fear crept into his arousal. His cunt was filled to the brim, stretched oh so deliciously wide. How was Lily expecting to...

"Don't worry, you can take it," Lily soothed his worries, "It'll just take some... work."

"What do you mea--aaaaooohgaaaawwwd!"

James had thought having his pussy stretched out felt good, but the feeling was far eclipsed by the sensations rocking his body as his sister started moving her hips, her monstrous cock bumping into his cervix again and again and again. With every one of her back strokes, an aching emptiness filled him that sucked the flared rod back in greedily. The blunt head rubbed his folds with every move, and James could feel his pussy stretch into his insides with every thrust. There was a hint of discomfort, but the blissful feeling of hot pre-cum spurting directly into his womb overshadowed any pain.

"Awwfffffuck yes, give it to me," James squealed, beginning to thrust his hips backwards - he wanted all of Lily inside him, "fuck me with that giant cock!"

"Glad to... hear you... like it... little cow," Lily ground out between grunts of exertion, slamming roughly into James' snatch.

Putting one hand on his stomach, James could feel her giant rod under the skin, sliding in and out. His fittingly huge knockers jiggled and swayed back and forth, the nipples rock-hard and throbbing, spraying milk all over the hardwood floor with the wild swinging. James' eyes fluttered half-closed, his slack mouth moaning and mooing hotly in appreciation of his sister's pounding. His teats dangled from his lower belly, slapping into his thick thighs and each other, only adding to the burning lust inside of him

Through the haze of lust he could feel the entrance to his womb slowly relaxing, giddiness filling him at the realization. Soon, Lily's whole cock would finally fit inside! Slamming back his hips with renewed vigor, he ground his teeth in exertion until finally, he could feel Lily's head slide even deeper inside of him, both inside his pussy and with his hand - and at the same time, his labia were stretched just a bit wider as her medial ring slid inside, aided by the copious amount of fluids. Lily's nuts slapped into his thighs and he could feel her sheath bump into his swollen labia, making him quiver with lust; and even though his legs were spread slightly, the thighs were still touching. But James was in no state of mind to think about anything but the amazing feeling of being stretched wide and filled to bursting.

Short, gasping moos were all that left his mouth, eyes wide and unfocused. Lily slowly **** the last few inches into him and leaned forwards to once again whisper into James' ear.

"Shh, little cow, shh," she cooed, "breathe. Breeaathe. I'm with you. And I'm so proud! You really took it all..."

James felt pride swell into his chest as his step-sister praised him. He'd done it! He'd actually done it! The whole, stiff length of Lily's gigantic, bestial cock was inside him! He squeezed the enormous bulge in his tummy, prompting a sharp hiss of pleasure from his breeding bull, who continued to whisper encouragement and praise into his drooping ear. As he got used to the incredible pressure and the bliss it awarded him with, his breathing became a bit calmer, but no less aroused.

"I'll start moving, little cow," Lily whispered into his ear, "are you ready?"

"Nnnh, yes," James gasped, wiggling his hips and brought both hands to the floor to brace himself against the coming onslaught. The insane pleasure radiating out from his lower body almost drowned out the light itching from just over his ears, but even though James noticed, he couldn't bring himself to care for anything but the giant prick Lily was stuffing him with.

And then she started moving. James whole world contracted until he could only feel the fat, blunted head of his step-sisters beast stretch and rub his womb, the cervix gripping and massaging the shaft tightly, the medial ring in his slick, twitching canal sliding back and forth over his folds, her heavy balls slapping into his jiggling thighs, the meaty slap of her hips into his expansive, cushiony ass, his boobs jiggling wildly and spraying milk... There were so many sensations, almost too many, and all contributed to his rapidly rising lust.

"Oh god, oh shit, oh fuck moo, give moooo--I cant--MOOOO!"

Barely coherent babbling and mooing flew from James' mouth as Lily stirred up his insides until his pussy contracted hard, gripping her cock in a vice-like grip, forcing her to slow her thrusts down. The excited little cow's body convulsed uncontrollably, his back arching, tits flying upwards and flinging their milk through the room. Muscles all over his body contracted and twitched while his sister kept fucking his gushing pussy all throughout his orgasm, prolonging it considerably.

"Moooo gaawwd, that was a-moo-zing," James groaned after what felt like an eternity, barely able to keep standing on all fours, "I can't take any more..."

"Oh, little cow," Lily answered lovingly, "I'm not quite done yet..."

With that, she grabbed the sides of his head and held on to something just above his ears. James confusion was short-lived: He was a cow. And cows, of course, had horns. Holding the bony protrusions tightly, Lily rested her elbows on James' shoulders, re-positioned her hips slightly and began to rapidly hammer into James squelching, sensitive pussy.

With every thrust, a breathless moo was **** out of James' mouth, his arms buckling as Lily's weight bore down on him and his tits were pressing into the milk-slick floor. As they were sliding around on the wet hardwood, James felt his huge nipples stimulated exquisitely by the grain, and realized the changed position of his hips gave Lily even better access to pound him. His tongue lolled out of his slack mouth as James' eyes rolled up in his head, Lily resting her cheek on his hair. He could hear her gasping, strained breaths as she fought to keep up the rapid pace, loud slapping sounds of flesh on flesh echoing through the whole house.

"Oh fuck... little cow... I feel... I can't... naaAAAHHH!"

"Oh moo, yes! Breed me!"

With a bellowing cry, Lily finally climaxed inside of James. He could feel her balls slide up his backside as they contracted, and then a strained groan rose from his lips as he could feel her already impossibly thick cock expand even more inside him as her thick cum was **** through it. Trembling in anticipation, James slammed back his hips, taking his step-sister in as far as possible, until finally, after what felt like hours, but must actually have been mere fractions of a second, the cow morph felt Lily's scalding hot jizz shot directly inside his womb.

"Moooo, it's so hoooot," he moaned as more and more sticky fluid was pumped into him. He felt his womb expand slowly, pussy tightly sealed around his sisters cock, letting nothing escape. Soon, his tummy bulged even more, growing bigger with every shuddering splurt of his sister. Her hips were still pumping erratically, her groans like music in James' ears. He was able to give her sooo much pleasure! And Lily gave him sooo much of her own!

Shaking his hips to squeeze every last drop out from her, James made happy little mooing sounds until Lily collapsed on top of him, causing a surprised squeak. She shifted her fall sideways and took James with her, both coming to lie in the doorway with James as the little spoon. Lily's cock slowly softened inside of James, sliding out little by little. The blunted head caught into James' cervix for a bit until it popped out, the abused ring of muscle closing fast enough for only a small amount of cum to leak out, which was then dragged out along with the deflating cock retreating into its sheath.

Lily draped one arm over James, sliding it into his cleavage and hugged him tight. He briefly wondered when his sister had become so muscular, before intertwining his fingers with hers and drifting off into an exhausted, but peaceful and contented sleep.