She slammed the barn door shut behind her, heart pounding as the rain hammered the roof. The stallion, Midnight, stood in his stall, massive and restless, his black coat gleaming under the dim bulb. Lena stripped fast, yanking off her soaked shirt and jeans until she was naked, skin prickling in the cool air. Her pussy was already slick, throbbing from the filthy idea she'd nursed all week.
"Come on, boy," she muttered, voice low and raw. She climbed the stall gate and dropped inside, bare feet sinking into the straw. Midnight snorted, nostrils flaring as he caught her scent. Lena didn't waste time. She dropped to her knees in front of him, hands sliding along his powerful legs until she reached his sheath. His cock was already starting to drop, thick and veined, hot to the touch. She wrapped both hands around it and stroked, feeling it swell and lengthen until it was a heavy, throbbing rod slapping against her tits.
"Fuck, you're huge," she growled, leaning in to lick the flared head. The taste was musky, salty. She opened wide and sucked the tip, tongue swirling, spit dripping down the shaft as she pumped him with both fists. Midnight stamped and whinnied, hips twitching. Lena's cunt clenched, juices running down her thighs. She needed more.
She stood, turned, and bent over the low rail, spreading her legs wide. Reaching back, she grabbed his cock and guided the blunt head to her entrance. It was too big, stretching her lips obscenely as she pushed back. "Yes, fuck me," she hissed, forcing the first inches inside.

Pain mixed with white-hot pleasure. She rocked harder, taking more of that massive animal cock until her belly bulged slightly and she was gasping. Midnight thrust on instinct, driving deeper, balls slapping her ass with each powerful stroke.
Lena came hard, screaming into the straw, pussy spasming around him. She didn't stop. She fucked back onto him until hot jets of cum flooded her, overflowing and running down her legs in thick streams. She collapsed forward, shaking, already planning the next night.