The barn smelled thick with hay, sweat, and the sharp tang of male heat. Rex the dog shoved the heavy door shut behind him, his tail already twitching as he scanned the shadows. He knew the pony was waiting. Big, dark, and always ready to take what he wanted. Rex's cock was half-hard already, pushing against his sheath just from the thought of that thick horsecock splitting him open again.
"About time you showed up, mutt," came the low, rough voice from the back stall. The pony stepped into the dim light, his massive frame looming. Black coat gleaming, muscles rolling under the skin, and that heavy sheath hanging between his hind legs, already starting to drop. The head of his cock peeked out, flared and dark, glistening with pre.
Rex didn't waste time with words. He turned, planted his front paws on the stacked bales, and lifted his tail high. "Shut up and fuck me, you horny bastard. Been thinking about your cock all day."
The pony snorted, moving in fast. Hooves clattered on the boards as he mounted, his weight pressing Rex down. One strong foreleg hooked around the dog's waist, yanking him back. The blunt, flared head of that horsecock slapped heavy against Rex's balls, then dragged up to press right against his tight hole.
"Fuck, you're already slick," the pony growled, grinding forward. "You fingered yourself thinking about this?"
"Yeah. Now quit teasing and shove it in."
The pony didn't need more invitation. He thrust hard, the thick medial ring popping past Rex's rim in one brutal push. Rex yelped, claws digging into the hay as that massive shaft stretched him wide, forcing his ass open inch by inch. The burn was perfect, the fullness making his own cock jerk and slap against his belly.
"Take it, dog. Take every fucking inch." The pony kept pushing until his heavy balls smacked against Rex's. He was buried deep, the flared head lodged right against the dog's prostate. Rex's hole clenched and fluttered around the invasion, dripping lube and pre down his thighs.
The pony started fucking him like he meant it. Hard, rolling thrusts that rocked Rex forward with every slam. The sound was filthy: wet squelches, skin slapping skin, the creak of the stall boards. Rex moaned loud and shameless, pushing back to meet every thrust.
"Harder, pony. Fuck my gay ass like you own it."
The pony obliged, pounding deeper, his cock swelling even thicker inside. The medial ring dragged over Rex's prostate on every stroke, milking thick strings of pre from the dog's twitching cock. Rex's balls drew up tight, his orgasm building fast and dirty.
The pony's breathing turned ragged. He leaned down, teeth grazing the back of Rex's neck.
"Gonna flood this hole. Gonna pump you so full you'll be leaking my load for days."
"Do it. Breed me."
With a guttural groan the pony slammed in to the hilt and came. Thick, hot jets of cum pumped deep, flooding Rex's guts. The pressure pushed Rex over the edge. His cock jerked and sprayed rope after rope across the hay bales while his ass milked the horsecock still throbbing inside him.
They stayed locked together, breathing hard, cum leaking out around the base of the pony's shaft. Rex's legs shook, but he didn't move. The pony's weight felt good, pinning him down, keeping that cock buried where it belonged.
"Round two in ten minutes," the pony muttered, already starting to rock his hips again.
Rex just grinned, tail wagging. "Make it five, stud."
