Lady Arabella Harrington-Smythe cut an impeccable figure on the polo field. At thirty-four, the blonde aristocrat was tall, toned from years of professional polo, with long legs, a firm athletic backside, and perky C-cup breasts that looked exquisite in her fitted white polo shirt. Married to me — Reginald Harrington-Smythe — for eight years, she was the perfect English rose of the upper class: educated at Cheltenham Ladies’ College, heir to a substantial estate in Gloucestershire, and a celebrated polo player who competed at national level.
Yet beneath the polished accent, the charity galas, and the designer riding gear lay a dark, all-consuming hunger.
It began in the sweltering July heat at our private estate. The stables were Arabella’s sanctuary. Among her string of agile polo ponies stood Thunder — an 18-hand pure black Shire stallion we kept primarily for breeding. He was a monster of a horse: powerful haunches, a broad chest, and a cock that, when fully erect, was terrifyingly large.
One evening after a hard match, Arabella returned to the stables still wearing her tight white breeches, tall black boots, and sweat-soaked polo shirt. Her face was flushed, blonde hair sticking to her neck.
“Reginald, darling,” she said in her crisp Received Pronunciation accent, “I must see to Thunder. He’s been terribly restless.”
I followed. The air inside the stable was thick with hay, leather, and the heavy musk of the animals. Thunder snorted as she approached. His massive sheath had already begun to drop, revealing the thick, black, veined length of his cock.
Arabella stared, transfixed. Her thighs pressed together.
“Close the door, please,” she whispered.
She stepped forward and ran her manicured hands along Thunder’s flank. The stallion shifted but stayed calm. With trembling fingers, Arabella unbuttoned her polo shirt and let it fall, exposing her sweat-glistened breasts. She peeled down her breeches and knickers in one motion, stepping out naked except for her riding boots.
“God, look at him…” she breathed.
She dropped to her knees in the straw and reached under the horse. Both hands wrapped around the thickening shaft. It grew rapidly in her grip — easily two feet long and thicker than her wrist. Arabella leaned in and pressed her face against the hot, musky flesh, kissing and licking along the length.
“Mmm… such a big, powerful boy,” she murmured, her posh voice husky.
She stood, turned, and bent over the sturdy breeding stand we used for mares. Reaching back, she guided the enormous flared head to her dripping pussy. With a long, shaky moan, she pushed backwards.
The head popped inside her. Arabella gasped loudly as her aristocratic pussy stretched obscenely around the stallion’s girth. Inch after thick inch disappeared into her body. Her belly visibly bulged with every thrust as Thunder began to instinctively pump.
“Oh my fucking God… yes!” she cried, her refined accent breaking. “Breed me, Thunder! Fill your polo whore!”
The horse thrust harder. Arabella’s body rocked forward with each powerful stroke. Sweat poured down her back. Her breasts swung heavily. I watched in stunned arousal as my elegant wife was fucked senseless by the massive stallion. Her orgasms came fast and hard — loud, shameless screams echoing through the stable.
When Thunder came, it was volcanic. Thick, hot ropes of horse cum blasted into her womb. So much that it sprayed out around his cock in heavy white torrents, flooding down her thighs and pooling in the straw. Arabella shuddered through another climax, milking him for every drop.
For the rest of the scorching summer, it became our daily routine.
Every evening after polo practice, Arabella would head straight to the stables. She grew bolder. Some days she would ride Thunder bareback first, grinding her bare pussy against his powerful back until she came, then drop down for breeding.
I built a special reinforced breeding platform so she could be mounted comfortably. She loved being taken from behind the most — bent over, boots planted wide, gripping the rails while Thunder slammed into her. The wet, obscene squelching sounds of her stretched cunt mixed with the slap of his heavy balls against her.
“Deeper!” she would beg in her upper-class voice. “Ruin my pussy! I want to feel you for days!”
Her body changed noticeably. Her lower belly developed a permanent slight swell from the sheer volume of cum she took. Her once-tight pussy became puffy and loose, constantly leaking thick horse seed. She began wearing a large silicone plug during the day to keep it inside her during luncheons and society events.
One particularly intense afternoon during a private tournament weekend, she took Thunder three times.
The first time was quick and desperate — right after her match, still in her sweaty polo kit, breeches pulled down just enough.
The second was slower. She lay on her back beneath him on a pile of clean straw, legs spread wide, guiding his massive cock into her while I held her hand. She looked me in the eyes as she was stretched and filled.
“I love you, Reginald… but I need this,” she gasped between moans.
The third time that evening was pure breeding. She stayed mounted on his cock for nearly forty minutes as he pumped load after load into her overflowing womb. Cum gushed out in rivers every time he shifted. When she finally dismounted, her belly looked visibly pregnant with horse seed. She waddled back to the house with it still leaking down her legs.
By late August, Arabella was completely addicted.
She started talking dirty during the sessions in her elegant accent:
“Fill me like a proper broodmare, darling Thunder.” “I want your foal growing in me.” “My polo friends have no idea what a filthy cum-dump I really am.”
She even had me film several sessions on my phone — close-ups of her stretched pussy, the belly bulge, and the massive creampies. We would watch them together later while she rode my cock, describing every sensation.
One rainy evening she tried something new. She lay on her back on the breeding stand, head hanging off the edge, and had me guide Thunder’s cock into her throat as far as it would go while he fucked her pussy. The sight of my aristocratic wife choking and gagging around horse cock while being bred was almost too much.
She came harder than ever that night.
On the final week of the heatwave, Arabella asked for something extreme.
“I want a full breeding day, Reginald. From morning until night. I want to be his mare.”
We cleared the main stable. She spent the entire day naked except for her riding boots and a leather harness. Thunder mounted her six times. Each session left her more cum-drunk and blissful. By the end, she could barely walk. Her belly was hugely distended with horse cum. Thick white fluid constantly poured from her ruined pussy.
As the sun set, she lay exhausted in the straw, covered in sweat and cum, gently stroking Thunder’s sheath.
“Thank you, my love,” she whispered to me, voice hoarse. “This is who I really am now.”
I kissed her cum-stained lips.
The refined British polo aristocrat had become a true horse breeding slut — and our secret summer of depravity was only the beginning.
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