Jake wiped sweat from his brow as he hauled another bale of hay into the barn. The summer heat pressed down on the old family farm like it wanted to fuck everyone into submission. His sister, Lena, was bent over stacking feed sacks, her cutoff shorts riding up to show the bottom curve of her ass cheeks. She was twenty-three, he was twenty-five, and their parents had left for the week to visit relatives. That left just the two of them to handle the chores and the tension that had been building since they were teenagers.
Lena straightened up and caught him staring. "What the fuck are you looking at, perv?" she said, but her voice had that low, teasing edge she only used when no one else was around.
"Your ass," Jake answered, direct as always. "Been staring at it all damn day. Those shorts are too fucking small."
She smirked and walked closer, hips swinging. "Yeah? You gonna do something about it or just stand there with your dick getting hard in your jeans?"
Jake dropped the bale. He grabbed her by the waist and spun her around, pressing her back against the rough wooden wall. His hands went straight to her tits, squeezing through her thin tank top. No bra, nipples already stiff. He yanked the top up and sucked one into his mouth, biting down just hard enough to make her gasp.
"Fuck, Jake," she moaned. "Suck harder."
He did, then switched to the other nipple while his hand shoved down the front of her shorts. Her pussy was already wet, no panties, just smooth shaved lips and a hot slit he could slide two fingers into right away. Lena bucked against his hand, grinding on his fingers like she needed them deeper.
"Pull my shorts off," she ordered. "I want your cock."
Jake yanked the denim down her legs. She kicked them away and spread her thighs. He unzipped his jeans, freed his thick cock, and rubbed the head up and down her slit, coating it in her juices.
"Turn around," he said. "Hands on the wall."
She obeyed, sticking her ass out. Jake lined up and shoved in deep in one thrust. Lena cried out, pushing back to take every inch. He started fucking her hard, the wet slap of skin on skin echoing in the barn.
Her pussy gripped him tight, hot and slick, milking his cock with every stroke.
"Harder, brother," she panted. "Fuck me like you mean it. Fill that sister pussy up."
Jake slammed into her, balls slapping her clit. One hand reached around to rub her swollen nub while the other held her hip. Lena came first, cunt pulsing around him, juices running down her thighs. He kept pounding through it until his own orgasm hit, shooting thick ropes of cum deep inside her.
They didn't stop there. After catching their breath, Lena dropped to her knees and sucked him clean, tongue swirling over his sensitive head, tasting their mixed cum. Then she bent over a hay bale and begged for round two. Jake took her from behind again, slower this time but still raw, telling her exactly how her tight hole felt around his cock.
By the time the sun went down they had fucked in the tractor shed, against the fence, and finally in the house on the kitchen table. Lena rode him reverse cowgirl, ass bouncing, while Jake reached around to finger her asshole. She screamed when she came again, and he followed, pumping another load into her.
The rest of the week followed the same pattern: work the farm during the day, fuck like animals at night. No guilt, just heat and need and the dirty satisfaction of using each other exactly how they wanted. When their parents came home, the secret stayed between them, but the barn still smelled like sex every time they walked past it.
