Cover of What Sis Knows

4 chapters · 13656 words · Read 0 times

Jonah is obsessed with porn, specifically anal porn, but he has not yet had a girlfriend or anyone to do anything with, despite turning 18. One day, he has a long and candid conversation with his older sister Kelly, who reveals tha she is not only very experienced in anal, she does it often. She shares a lot of things with him about her desire for it and how it feels. When she eventually suggest that she can show him what it's like to take a girl anally, it's just the beginning of a long anal adventure for the siblings, where they have sex in secret. All characters are over 18.

Chapter 3: The Visit

The knock came soft, almost hesitant, and Kelly smiled at the sound of it. She'd been listening for his footsteps in the hallway for the last ten minutes, her wine glass sweating condensation onto the kitchen counter.

She opened the door to find Jonah shifting his weight from foot to foot, a six-pack of cheap beer clutched to his chest like a shield. His eyes met hers, then darted away, then came back with a determination that made her heart skip.

"Hey," he said, his voice cracking slightly. "Mom told me to bring these. Said you'd probably be out of the good stuff."

Kelly stepped aside, letting the door swing wide. "Mom's not wrong. Come in."

The apartment wrapped around him like a warm blanket the moment he crossed the threshold. Soft amber light pooled from a standing lamp in the corner, casting the living room in a glow that felt intimate and safe. The scent of lavender and something deeper, muskier, curled through the air.

"I've been thinking about you," she said, taking the beer from his hands and setting it on the counter. "About last time. About how you've been feeling since."

Jonah shoved his hands into his pockets, shoulder blades pressing back against the doorframe. "I don't know. Confused. Good. Terrified. Kind of all at once."

Kelly moved closer, stopping just short of touching him. "There's nothing to be terrified of, little brother. What happened between us—it's ours. Nobody else's. And I don't see a problem with it."

He met her eyes then, hazel meeting hazel, and something unspoken passed between them. "You really mean that?"

"Look at me," she said, reaching up to brush a strand of hair from his forehead. "I'm a cop. I deal in rules and consequences every single day. But this? This is different. This is about connection, about family in the truest sense. There's nothing wrong with finding pleasure in someone who understands you completely."

The tension in his shoulders melted. She watched the fight drain out of him, replaced by something hungrier.

"Come on," she said, grabbing his hand and pulling him deeper into the apartment. "I want to show you something."

The bedroom was larger than he expected, dominated by a king-sized bed with rumpled dark sheets that looked perpetually warm. Kelly led him past it to a heavy oak dresser against the far wall, its surface cluttered with photo frames and loose handcuffs and a worn leather badge holder.

"Cop souvenirs," she said, gesturing at the collection. "Every bust, every case, every win. I keep something from each one."

She picked up a tarnished silver badge, turning it over in her fingers. "This was my first arrest. Kid tried to rob a convenience store with a plastic gun. I was so scared my hands were shaking, but I got him in cuffs anyway."

She set it down and picked up a folded flag, crisp and clean. "This one's from a funeral detail. Took me three months to get through that one."

Jonah reached out, touching the edge of a small wooden baton. "This yours?"

Kelly laughed, a low, throaty sound. "Confiscated from a guy who thought he could outrun me. He was wrong."

She opened the bottom drawer, revealing a cluttered jumble of patrol caps, keychains, and a single brass bullet casing. But it was the drawer above it that caught his attention.

"That's not police stuff," he said, his voice dropping.

"No," Kelly said, pulling the drawer open wider. "That's my other collection."

Inside, nestled in a bed of black velvet, lay an array of silicone and steel that made his breath catch. A set of graduated butt plugs gleamed under the lamplight, ranging from small and beginner-friendly to shockingly thick. Beside them sat two anal dildos, their curved shafts and flared bases promising depths he'd only ever watched on screens.

"Which one caught your eye?" Kelly asked, her voice a silken challenge.

Jonah's hand hovered over the collection, fingers trembling. "The purple one. With the—the curve."

"Good choice," she said, pulling it out and handing it to him. It was heavier than he expected, the silicone warm and supple in his palm. "That one's my favorite. It hits just the right spot."

Her fingers closed over his, guiding his grip. "Tonight, we're going to use all of them. If you're up for it."

"What about dinner?" he asked, his voice barely a whisper. "We told Mom and Dad we were having dinner."

Kelly laughed, a low, wicked sound. "There's leftover lasagna in the fridge. We'll heat it up later. But right now, I've got a different kind of hunger."

She reached behind her and unzipped her dress, letting it pool at her feet. She wore nothing beneath it. Her breasts swayed free, full and tipped with dark nipples that hardened in the cool air. She turned around, presenting him with the curve of her ass, the same ass he'd worshipped with his tongue in his own bedroom just days ago.

"Take your clothes off, Jonah," she said, looking over her shoulder. "I want to feel you inside me tonight. But first, I want you to warm me up."

He fumbled with his shirt buttons, his fingers clumsy and desperate. Kelly turned to watch, a knowing smile playing on her lips as he shucked his jeans and boxers, his cock standing at full attention.

"Look at you," she murmured, stepping closer. "So ready. So eager."

She took his hand and guided him to the bed, pushing him down onto the rumpled sheets. The fabric was warm, saturated with her scent, and his head swam with it.

Kelly knelt between his legs, her fingers wrapping around his shaft. "You've been thinking about this all week, haven't you?"

"Every day," he admitted, his voice cracking. "Every night. I couldn't concentrate on anything."

"Good," she purred, stroking him slowly. "That's exactly how I've been feeling."

She leaned forward, her breasts brushing against his thighs as she took the small purple plug from his hand. "Let's start with this one. Then we'll work our way up."

She reached behind herself, lubing the plug with a bottle from the nightstand before pressing it against her ass. Jonah watched, transfixed, as she pushed it inside herself with a satisfied sigh. Her muscles clenched around the base, and she rocked her hips, getting used to the fullness.

"Now stand up," she said, turning around and bending over the edge of the bed. "I want you to watch."

She worked the plug in and out, slow and deliberate, letting him see every inch of its travel. Her asshole stretched around the silicone, pink and wet, and Jonah's mouth went dry.

"Your turn," she said, pulling it free with a soft pop. She handed it to him, slick with her juices. "Lick it clean."

He obeyed without hesitation, dragging his tongue along the silicone surface. The taste was musky, intimate, and it sent a jolt straight to his cock.

"Good boy," Kelly murmured, taking it back and sliding it into place again. "Now the bigger one. The blue one."

They worked through her collection methodically. The blue plug slid in next, thick enough to make her pause, her fingers gripping the sheets as she pushed it deeper. Then the ribbed one, which made her moan, a low, guttural sound that vibrated through his bones. By the time she reached the dark red dildo with the pronounced curve, she was slick with sweat, her hair plastered to her forehead.

"This one," she breathed, positioning it at her entrance. "This is the one that's going to make me scream."

She pushed it inside herself, inch by agonizing inch, and Jonah watched her ass swallow the silicone greedily. She rode it slowly at first, then faster, her hips bucking wildly as the curve hit her sweet spot.

"Fuck," she gasped. "Jonah—come here. Get behind me."

He scrambled onto the bed, positioning himself behind her. She reached back and guided his cock to her soaking wet slit, but he hesitated.

"Not there," she said, breathless. "I want it where I've been warming up. I want your cock in my ass. All of it. Right now."

She pulled the dildo free with a wet sound and tossed it aside. The plug followed, and then she was empty, her hole gaping and slick with lube.

"Put it in," she demanded. "Slow. Let me feel every inch."

Jonah lined himself up, the head of his cock pressing against her entrance. She pushed back against him, and he felt the ring of muscle give way, welcoming him inside.

"Fuck," he breathed, his eyes rolling back. "Oh my God, Kelly."

"That's it," she moaned, pushing back harder. "Deeper. Give me all of it."

He bottomed out inside her, his hips flush against her ass, and for a moment they both went still. The heat was overwhelming, the tightness almost unbearable. She clenched around him, and he cried out.

"Move," she commanded. "Fuck me like you've been dreaming about."

He began to thrust, slow and deep, and she met him stroke for stroke. Her moans filled the room, raw and unguarded, the sound of them feral and intimate. He reached around, his fingers finding her clit, and she bucked wildly.

"That's it," she gasped, her voice frayed at the edges. "Right there. Don't you dare stop."

He found a rhythm, his hips slapping against her ass while his fingers worked her slick flesh. The heat of her wrapped around him, impossibly tight, and he could feel every tremor that ran through her body. Kelly braced herself against the headboard, her knuckles white, her back arched like a drawn bow. She let out a sharp cry as her legs began to tremble.

"I'm gonna come," she warned, her voice cracking. "Don't stop. Don't you fucking stop."

He didn't. He drove into her harder, the sound of their bodies colliding filling the room. Her climax hit her like a wave, dragging a low, guttural moan from her throat. Her walls clenched around him, and he nearly lost himself right then.

"Fuck, Kelly," he breathed, his forehead pressing against her shoulder blade.

She turned her head, her lips finding his ear. "That was just the warm-up, little brother."

She pulled away from him, the loss of her heat making him gasp. She turned to face him, her chest heaving, her skin slick with sweat. Her hand traveled down her body, disappearing between her legs as she watched him with heavy-lidded eyes. She pulled her hand back, glistening with her own wetness, and brought it to her mouth.

"I want you to watch this," she said, reaching for an electric blue vibrator that had been lying on the nightstand. With a flick of her thumb, the device buzzed to life, its steady hum filling the air. She lay back on the bed, spreading her legs wide, and pressed the vibrator to her swollen clit.

"Get behind me," she ordered. "I want your cock back in my ass while I use this."

He scrambled into position, his hands gripping her hips as he pushed inside her. The angle was different now, the tightness almost overwhelming. She moaned as he bottomed out, the vibrator still humming against her clit. Her whole body tensed, then rippled with another orgasm, and she cried out his name. He began to move with a raw, animal urgency, all technique abandoned in the face of her hunger. Kelly drove her hips back against him, relentlessly taking him deeper. The vibrator stayed pressed between her legs, a constant buzzing counterpoint to his every thrust. Her release came fast and hard, a shuddering wave that made her thighs quake and her voice break into a sob. He kept going, his pace quickening, his breath ragged in his ears. She came again, her body jerking violently, and then a third time, her composure dissolving into pure, unfiltered sensation. Her talk dissolved into a stream of filth, her words half-swallowed by the pleasure, telling him exactly how good he felt splitting her open, how deep he was, how she'd been thinking about this since the night in his bedroom.

"Oh my god, sis!" he moaned.

She laughed, a wild, bright sound that broke into a moan. "I'm your anal slut sister. Don't you ever forget it. Now fucking destroy me."

He gave her exactly what she asked. He pulled her hips back into him, his strokes losing their precision, becoming longer and more punishing. The vibrator slipped from her fingers, forgotten, as her arms gave out and she collapsed face-first into the sheets. He followed her down, his chest pressing against her back, his mouth against her ear.

Her muscular ass rippled with the force of his thrusts, the skin reddening where his hips slapped against her. He felt the pressure building, hot and urgent, coiling in his gut. Kelly's voice climbed in pitch, her fingers fisting the sheets as another wave crested inside her. She screamed, muffled by the mattress, her body locking up. He felt her orgasm seize him, milking him, pulling him under. With a final, desperate shove, he buried himself to the root and came, a hot, pulsing flood that filled her deep.

For a moment, neither of them moved. The only sound was their ragged breathing and the faint hum of the vibrator still buzzing against the sheets. Then Kelly stirred, shifting beneath him.

"Holy shit," she whispered, her voice thick.

He pulled out slowly, a sheen of sweat and release coating his cock. She rolled onto her back, a lazy smile spreading across her face. Her eyes were dark, satisfied, and full of intent. "Dinner's probably cold by now."

Jonah collapsed beside her, his chest heaving. "I don't think I can stand."

She laughed, a low, contented sound, running her hand through his sweat-dampened hair. "You're going to learn. There's a lot more where that came from."

Jonah lay there, the sweat cooling on his skin, his heart still hammering against his ribs. Kelly's fingers traced lazy patterns through his hair, grounding him.

"I mean it," she said, her voice a low murmur. "You've got stamina to build, little brother. And I've got patience to spare."

He turned his head, meeting her eyes. "I don't think I've ever felt anything like that."

Kelly smiled, slow and knowing. "That's because you've been watching screens instead of living. Now you're living."

She pushed herself up, her breasts swaying as she swung her legs off the bed. "Come on. You're not getting out of dinner that easily."

Jonah followed her into the bathroom, his legs still shaky. The mirror was fogged with steam from a shower she must have taken earlier, and the air smelled like her soap and something muskier beneath it.

Kelly handed him a washcloth, already wet and warm. "Clean yourself up. I'll get the lasagna in the oven."

He ran the cloth over his cock, hissing at the sensitivity. The fabric came away streaked with her slickness and the evidence of his release. He rinsed it in the sink, watching the water swirl pink and cloudy.

When he emerged, Kelly was in the kitchen, naked as the day she was born, bending over to slide a glass dish into the oven. The sight of her made his cock twitch despite the exhaustion.

"See something you like?" she asked, not turning around.

"You know I do."

She straightened and turned, a wooden spoon in her hand. "Good. Because I'm not putting a single stitch on for the rest of the night."

They ate at the small kitchen table, the lasagna steaming between them. Kelly had opened one of the bottles of red wine he'd brought, and the glass sweated in her hand. She ate with her fingers, pulling apart the layers of cheese and meat, licking the marinara from her knuckles with deliberate slowness.

Jonah couldn't stop watching her. The way her breasts rested on the table's edge. The way her thighs spread just wide enough to make his imagination run wild.

"So," she said, spearing a piece of sausage. "How does it feel? Knowing your sister's the first person you've been inside?"

He nearly choked on a bite of pasta. "You're—you're really direct."

Kelly laughed, a full, throaty sound. "I'm a cop, Jonah. I don't do subtle. I see a situation, I address it head-on."

"I feel like I'm dreaming," he admitted, setting down his fork. "Like this is all going to disappear when I wake up."

She studied him, her hazel eyes softening. "This is real. As real as the table between us, as real as the wine in my glass. I'm not going anywhere."

She pushed her chair back and walked around to his side, her hips swaying with intent. She settled onto his lap, straddling him, the heat of her pressing against his half-hard cock.

"But right now," she whispered, her lips brushing his ear, "I want to feel you again. Not because I have to. Because I want to. Because feeling you inside me is the only thing I've thought about all week."

She reached down and guided him to her entrance, still slick from their earlier exertions. He slid inside her with a wet, obscene sound, and she moaned, rolling her hips against him.

"Fuck, that's good," she breathed. "You've got a perfect cock, you know that? Perfect for me."

He gripped her hips, thrusting up into her as she rode him. The chair creaked beneath them, the rhythm building quickly. She was wetter this time, looser, and the sensation was different from before—still intense, but more intimate somehow.

"Look at me," she demanded, her fingers curling under his chin. "I want you to see what you do to me."

Their eyes locked as she moved, slow and deep, her expression raw and open. He watched the way her mouth parted, the way her lashes fluttered, the way her body took him in and held him tight. It was the most real thing he'd ever seen.

"I love this," he confessed, the words slipping out before he could stop them. "I love being inside you."

Kelly's rhythm stuttered, her breath catching. "Say it again."

"I love being inside you. I love the way you feel. I love that this is ours."

She crushed her mouth to his, swallowing his words. Her hips moved faster, desperate, and he felt her trembling around him. He met her urgency with his own, his hands sliding down to grip her ass, pulling her closer with each thrust.

She came with a cry against his mouth, her whole body clenching around him. He followed a heartbeat later, spilling into her with a shuddering groan. They stayed tangled together, the empty plates forgotten, the wine going warm.

Kelly pulled back just enough to press her forehead to his. "Dinner's over. But we're just getting started."

Jonah's hands slid down her back, tracing the ridges of her spine. The taste of wine and marinara lingered on his tongue, mixing with the salt of her skin. Kelly shifted on his lap, and the movement sent a fresh jolt through his spent cock.

"Bed," she said, her voice leaving no room for argument. "Now. I want you on your side."

She slipped off him, and the sudden emptiness made him ache. He followed her to the bedroom, his legs still unsteady. The sheets were cool against his overheated skin, and he settled onto his side, watching her climb in beside him.

Kelly pressed her back against his chest, pulling his arm around her body. She guided his hand to her breast, kneading the soft flesh, his thumb finding her nipple. She sighed, arching into his touch.

"Like this," she murmured, reaching behind her to take his cock in hand. She pulled him snug against her, the heat of her ass pressing against his belly. "Slow. Deep. Feel every inch."

He slid inside her pussy from behind, the angle drawing a sharp gasp from both of them. She was slick and warm, and the position made everything deeper, more intimate. His fingers worked her nipple as he began to move, lazy and deliberate.

"Fuck," she breathed. "That's it. That's exactly it."

Their bodies rocked together in a rhythm that felt ancient, effortless. His mouth found the curve of her neck, kissing the salt from her skin, and she turned her head to meet him. Their tongues tangled, slow and drugging, as his hand traveled between them to grip her other breast.

She was soft everywhere. Her hips rolled against him, taking him deeper, and he felt the familiar tightening in his gut. But Kelly reached back, gripping his thigh, slowing him down.

"Not yet," she whispered against his lips. "I want more."

She guided him out of her, and he whimpered at the loss. But she repositioned, lifting her top leg, opening herself to him in a way that made his mouth go dry. She guided him to her ass, slick from their earlier session, and pushed back.

The tightness was overwhelming. He sank into her with a groan, his forehead pressing against her shoulder blade. She clenched around him, her breath hitching.

"Both," she demanded. "I want both tonight."

He moved inside her, each thrust a revelation. His hand found her breast, pinching her nipple, and she cried out. Their tongues met again, sloppy and desperate, as he fucked her ass and played with her tits.

She was close. He could feel it in the way her muscles fluttered, the way her breathing turned ragged. He reached down, his fingers finding her clit, and she sobbed against his mouth.

"Come with me," he begged. "Please, Kelly."

She screamed into his mouth as she shattered, her body convulsing around him. He followed a heartbeat later, his release hot and deep, filling her as her climax milked him dry.

They lay tangled together, his cock still buried inside her, the sheets soaked with their sweat. Kelly's hand found his, lacing their fingers together over her heart.

"Look at us," she whispered, her voice thick with wonder. "Look at what we are."

He nuzzled her neck, breathing in the scent of her. "I don't ever want to stop."

She squeezed his hand, and for a long moment, neither of them spoke. The night stretched on around them, quiet and warm, the city's distant hum muffled by the closed window.

Finally, Kelly stirred. "You need to go home."

Jonah's heart lurched. "What?"

She untangled herself, rolling to face him. Her hand cupped his cheek, her thumb brushing his cheekbone. "Mom and Dad expect you back tonight. I'm not ready for them to know. Are you?"

He shook his head, hating the truth of it. "But I don't want to leave."

"And I don't want you to go," she said. "But we have to be careful. Smart." Her smile turned knowing. "That's what makes this last."

She climbed out of bed, naked and unashamed, and began gathering his clothes. He watched her move, the way her muscles flexed beneath her skin, the way she existed so fully in her own body.

He dressed slowly, his limbs heavy and his mind fogged. Kelly walked him to the door, wrapped in a silk robe that did nothing to hide the flush on her skin.

He leaned up, his lips brushing hers. "Is this really happening?"

She smiled at him, the expression both tender and hungry. "It's happening, little brother. And it's going to happen again very soon."

She closed the door behind him, and he stood in the hallway, his cock still aching, his heart racing. He wasn't tired. He wasn't confused. He was awake.

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