It was a sunny Saturday morning, and the house was quiet in a way it rarely was, a deep, expectant silence born of their parents’ absence. Rose and Daniel had left early that morning for a weekend trip to visit old college friends upstate, leaving their daughters, Savannah, twenty, and Lily, freshly eighteen, to their own devices.

Lily Cromwell, a slight girl with a waterfall of honey-blonde hair she usually kept in a messy bun, was already deep into her own world. Her sanctuary was her bedroom, a space dominated by towering bookshelves, a high-end gaming PC humming softly, and posters of obscure fantasy maps and constellations. While the world outside her door promised summer freedom, Lily found hers in the intricate strategy of a new video game and the hefty fantasy novel bookmarked on her nightstand.

Down the hall, she could hear the muffled sounds of her older sister, Savannah, moving about. Savannah was everything Lily wasn’t: outgoing, effortlessly popular, with a confident grace and a smile that seemed to capture all the light in a room. Her blonde hair was always sleek and styled, her clothes trendy and just the right amount of daring. Lily loved her sister fiercely, with a complicated blend of admiration, envy, and a quiet, unspoken yearning she couldn’t quite name.

The peace of the morning was shattered around noon with the sudden, thunderous arrival of bass. Music erupted from the living room speakers, a pulsing hip-hop beat that vibrated the floorboards. Lily’s head snapped up from her book. Peeking out her door, she saw a stream of people already flowing into the house, laughing, shouting, carrying cases of beer and bottles of liquor. Savannah moved among them like a queen, greeting everyone with hugs and air kisses.

A party. Of course. With their parents gone, it was practically a Savannah tradition.

Lily’s social anxiety, a familiar tight coil in her stomach, cinched tighter. She retreated, locking her door with a soft click. The world outside her room was a chaotic, alien landscape. Here, she was safe. She put on her noise-canceling headphones, queued up a playlist of ambient soundtracks, and tried to lose herself in her novel. But the thump of the bass was a persistent, physical presence, and the occasional burst of laughter or shriek pierced through her audio shield.

Hours bled away. Lily ordered food from an app, instructing the delivery person to leave it at her door. She ate curled up at her desk, watching the party through the narrow crack in her curtains. Bodies swayed on the back patio under string lights, the blue glow of the pool illuminating tangled limbs. She saw Savannah often, always at the center of a group, her head thrown back in laughter, a red plastic cup always in her hand.

As night deepened, the character of the party shifted. The music grew slower, heavier. The crowd thinned, but the voices that remained were louder, more slurred. Lily gave up on reading and simply lay in bed, staring at the ceiling, waiting for it to be over. It was well past midnight when she noticed a different sound cutting through the bass.

It wasn’t music or party noise. It was coming from the room next to hers, Savannah’s room.

A low, rhythmic thumping against the shared wall. And voices. Male voices, grunting. And Savannah’s voice, but unlike any sound Lily had ever heard her make, a high, keening cry that was neither pain nor laughter, but something raw and primal.

Curiosity, hot and sudden, ignited in Lily’s chest, burning away her anxiety. She slipped out of bed, her bare feet silent on the plush carpet. She pressed her ear to the wall. The sounds were clearer now: ragged breathing, skin slapping against skin, the creak of Savannah’s bedframe, and her sister’s voice, rising in pitch, chanting “Yes, yes, oh god, yes…”

Her heart hammered against her ribs. A strange, liquid heat pooled low in her belly. This was wrong. She should go back to bed. But her feet carried her to her bedroom door. She opened it a sliver. The hallway was empty, lit only by the faint glow from the living room. The bass from the party downstairs was a dull roar, masking her movements.

She crept the few steps to Savannah’s door. It was slightly ajar. A sliver of warm, dim light spilled out. The sounds from within were now unmistakable, a symphony of sex that was both shocking and mesmerizing. Lily’s breath hitched. Her hand trembled as she pushed the door open just a fraction more, just enough to see.

The scene inside was imprinted on her mind in a single, searing flash.

Savannah was on her hands and knees in the center of her rumpled bed. Her sleek blonde hair was a tangled mess. Her face was turned towards the door, eyes screwed shut in ecstasy, lips parted around silent screams. She was naked, her body gleaming with a light sheen of sweat, the curves Lily had always envied now on full, breathtaking display.

And she was not alone.

A muscular, dark-haired guy knelt behind her, driving into her with powerful, relentless strokes, his hands gripping her hips so tightly his fingers dug into her flesh. Another guy, taller and blond, faced her, his own hips pistoning as he fucked her mouth. Savannah took him deep, her throat working, her hands gripping his thighs.

Lily’s brain stuttered, trying to process the mechanics of it. A spitroast? The term floated up from some hidden recess of her mind, from whispered conversations overheard at school. And then the man behind Savannah shifted, and Lily saw him pull out, glistening and huge, before pressing something, his thumb? No, it was him again, but somewhere else, against Savannah’s other entrance. With a groan and a push, he was inside her there, too.

Savannah’s body arched like a bowstring, a strangled, guttural cry tearing from her throat as she was filled completely, stretched, and claimed from both ends. The two men moved in a rough, synchronized rhythm, using her body with a fierce, animalistic ownership. And Savannah… Savannah was lost in it. She was not a victim, she was a goddess of debauchery, meeting every thrust, urging them on with broken pleas.

Lily should have been horrified. Repulsed. She should have run.

But she didn’t.

A bolt of pure, electric arousal shot through her, so intense it made her knees weak. She felt a sudden, shocking wetness between her own thighs. Her nipples tightened painfully against her thin cotton sleep shirt. She pressed a hand over her mouth to stifle her own gasp, her eyes wide, unblinking, drinking in every detail.

She watched the sweat drip down the spine of the man behind. She watched the way Savannah’s breasts swayed with the force of their movements. She watched the blond guy curl his fingers in her sister’s hair, controlling the pace of her head. The air in the hallway, and leaking from the room, was thick with the smell of sex, sweat, and cheap beer, a pungent, intoxicating cocktail.

The pace became frantic, brutal. The men’s grunts grew sharper, punctuated by curses. Savannah’s cries dissolved into a continuous, sobbing wail of pleasure. Lily’s own hand drifted down, of its own volition, pressing against the ache through her pajama bottoms. A soft, shameful moan escaped her lips, lost in the noise.

“I'm gonna cum in your slutty pussy,” the dark-haired man growled, his voice ragged.

“Take it,” the blond one commanded, pushing deeper into Savannah’s mouth.

With a final, shuddering series of thrusts, they both stilled, their bodies seizing. Lily saw the one behind Savannah bury himself to the hilt, his back muscles clenching as he emptied into her. The one in front pulled out of her mouth with a wet pop, stroking himself roughly over her face and chest, painting her skin with streaks of white. Savannah convulsed between them, a wild, wordless scream tearing from her as her own climax ripped through her, leaving her trembling and collapsed onto the bed, spent and glistening.

The dark-haired man pulled out, chuckling low, slapping her ass casually before they casually stumbled towards the en-suite bathroom. Savannah lay where she fell, a beautiful, ruined mess, breathing in ragged gulps.

Lily fled. She darted back into her room, closed the door silently, and leaned against it, her whole body trembling. Her heart felt like a wild bird trying to escape her chest. The image was burned into her retinas: her sister, used, claimed, overflowing with pleasure and seed. And her own body was still humming, alive with a need she had never known, slick with her own desire.

She stumbled to her bed, collapsing onto it. She touched herself then, frantically, clumsily, her fingers finding the swollen, sensitive nub between her folds. She thought of Savannah’s face, of the two men, of the sheer, overwhelming carnality of it. The climax that hit her was swift and violent, a shockwave of pleasure that left her breathless and ashamed, curled into a tight ball as tears of confusion and release leaked from her eyes. She fell into a fitful, haunted sleep just as the sun was about to come up.

Sunday morning arrived with a brutal clarity. Lily woke with only a few hours of sleep, feeling raw, her eyes gritty. The house was eerily silent, a battlefield after the war. The stench of stale beer and cigarettes hung in the air. Empty cups and bottles littered every surface.

She avoided Savannah all morning. She heard her sister moving around, cleaning up with a surprising efficiency. The clank of bottles in a trash bag, the hum of the vacuum. Lily stayed locked in her room, pretending to sleep, then pretending to be engrossed in her game. Her mind was a riot. Every time she pictured Savannah, making coffee, wiping a counter, it was overlaid with the image of her on that bed, her body a playground for those men.

When she finally had to emerge for food, the encounter was paralyzingly awkward. They met in the kitchen doorway. Savannah, dressed in yoga pants and a tank top, her hair in a messy but chic ponytail, looked tired but vibrant, a cat who’d gotten the cream.

“Morning, sleeping beauty,” Savannah said, her voice slightly hoarse. She smiled, and it was the same brilliant, easy smile. “Survived the lockdown?”

Lily couldn’t meet her eyes. She stared at a spot on the floor, her face flaming. “Yeah. Fine.”

“You want some eggs? I’m making a recovery brunch.”

“No. I’m good.” Lily’s voice was a squeak. She sidled past, grabbing a granola bar, her body tense as if expecting a blow.

Savannah’s smile faltered. “Lily? You okay? You look… pale.”

“I’m fine,” Lily repeated, fleeing back to her room.

The pattern repeated throughout the day. Lily would jump at the sound of Savannah’s voice. She’d flinch if Savannah got too close. She answered in monosyllables, her gaze perpetually downcast. The secret sat between them like a physical entity, a grotesque, pulsating thing that only Lily could see.

Finally, as the late afternoon sun slanted through the living room windows, Savannah had enough. Lily was trying to sneak through to get water when Savannah stepped into her path, blocking the way to the kitchen.

“Okay, seriously. What is your deal?” Savannah asked, crossing her arms. Her tone wasn’t angry, but concerned, edged with frustration. “You’ve been acting like a spooked rabbit all day. Did someone at the party bother you? Did you hear something?” A faint, knowing smirk touched her lips. “See something, maybe?”

The smirk did it. It was a spark to the tinderbox of Lily’s shame and confusion and desperate, unwelcome desire. Tears welled up hot and fast.

“I saw you!” Lily burst out, the words ripping from her throat. “Last night! I heard noises and I… I looked in your room!”

Savannah’s smirk vanished. Her expression went carefully neutral, but a flicker of something, surprise, amusement, or caution, danced in her blue eyes. “Oh.”

“I saw… I saw everything,” Lily whispered, the tears now flowing freely. “Those two guys… what they were doing to you… how they… how they finished.” The words felt dirty in her mouth, but also thrilling.

Savannah didn’t look ashamed. She studied her younger sister, her head tilting. She took a step closer. Lily didn’t retreat.

“And?” Savannah prompted, her voice soft, dangerously low.

“And… and I…” Lily’s confession tumbled out in a rush of mortified truth. “I watched. I watched until the end. And I… I got so… it made me feel…” She covered her face with her hands, sobbing. “I’m so messed up. I’m sorry.”

For a long moment, there was only the sound of Lily’s hiccupping cries. Then, gentle hands pried hers away from her face. Savannah was looking at her not with disgust or anger, but with an intense, curious fascination.

“Hey,” Savannah murmured, her thumbs wiping away Lily’s tears. “Shhh. It’s okay.”

“It’s not okay!” Lily choked. “You’re my sister! I shouldn’t have… I shouldn’t feel like that!”

“Like what, Lily?” Savannah’s voice was a velvet lure. “Tell me what you felt.”

Lily shook her head, unable to speak the words.

Savannah leaned closer. Her scent, vanilla body lotion, and, faintly underneath, something muskier, sexier, enveloped Lily. “Did it turn you on?” she breathed, the question barely audible. “Seeing me like that? Taken like that?”

Lily whimpered, a sound of pure submission. She gave the tiniest nod.

Savannah’s lips curved into a slow, breathtaking smile. It wasn’t the party-girl smile. This was something else, ancient and knowing. “I thought I heard something in the hall,” she murmured. “A little gasp.” Her fingers, still under Lily’s chin, traced a line down her throat. “I wondered.”

“You… you did?” Lily’s world was tilting on its axis.

“Mmhmm.” Savannah’s other hand came up, brushing a strand of hair from Lily’s damp cheek. “You know, I’ve noticed you looking at me sometimes. Not like a sister looks at a sister.”

Lily’s breath caught. She had thought her secret, confused longing was invisible.

“It’s okay,” Savannah whispered, her lips now dangerously close to Lily’s ear. “It’s more than okay.” She pulled back just enough to look into Lily’s eyes. “Do you want to know what it feels like, Lily? Not just watching. Feeling.”

The question hung in the air, charged and impossible. Every cell in Lily’s body screamed yes. Every rule, every taboo, crumbled to dust before the raw need in Savannah’s gaze.

“I… I’m a virgin,” Lily stammered, the last vestige of her defense.

A spark of something tender and possessive lit Savannah’s eyes. “I know,” she said softly. “Which means I get to be your first. In everything.”

She took Lily’s hand. Her touch was electric. Lily, trembling, let herself be led. Not towards Savannah’s room, with its memories of the previous night, but into the soft, afternoon-lit quiet of Lily’s own sanctuary.

Savannah closed the door behind them. The world outside ceased to exist. Here, there were only books, fairy lights, and the terrifying, beautiful woman who was her sister.

Savannah turned to her. “Have you ever kissed anyone, Lily?”

Lily shook her head, mute.

“Then we start there.”

Savannah cupped her face, her touch impossibly gentle. She leaned in, and their lips met. It was not a sisterly kiss. It was soft at first, exploratory, a brush of warmth that sent jolts through Lily’s entire nervous system. Then Savannah’s lips parted, inviting, and Lily followed her lead. The kiss deepened, becoming wetter, hotter. Savannah’s tongue touched hers, and Lily moaned into her mouth, a sound of shock and delight. Her hands came up, tentatively, to rest on Savannah’s waist. She felt the firm muscle under the soft fabric, the same waist those men had gripped.

Savannah broke the kiss, her own breathing slightly quickened. “Good,” she purred. “So good.” Her hands went to the hem of Lily’s t-shirt. “May I?”

Lily nodded, her arms lifting obediently. Savannah drew the shirt over her head, then unhooked Lily’s simple bra with practiced ease. Lily stood before her, half-naked, her small, pert breasts exposed, her nipples already tight peaks. She expected to feel shy, but under Savannah’s appreciative gaze, she felt only a powerful, intoxicating exposure.

“Beautiful,” Savannah breathed. She leaned in, not to kiss her mouth, but to take one nipple into her mouth, licking it with her tongue before sucking gently.

Lily cried out, her fingers tangling in Savannah’s sleek hair. The sensation was unbelievable, a direct line of pleasure to her core. Savannah attended to one breast, then the other, her hands roaming over Lily’s ribs, her stomach.

Then Savannah stood, her own eyes dark with desire. “My turn,” she said, and pulled her tank top over her head, discarding her bra. Her breasts were fuller, heavier than Lily’s, tipped with dusky pink nipples. Lily had seen them last night, bouncing wildly. Now, she was allowed to look, to worship. She reached out a trembling hand and cupped one, feeling its glorious weight.

Savannah guided her back onto the bed, laying her down amidst the stuffed animals and soft blankets. She followed, covering Lily’s body with her own, their skin meeting in a silken slide. The feeling of Savannah’s full breasts against hers, their stomachs pressed together, was overwhelming. They kissed again, deeper, hungrier, their legs intertwining.

Savannah’s hand slid down, over the waistband of Lily’s pajama shorts, into the damp heat beneath. Lily gasped against her mouth, her hips bucking involuntarily.

“So wet,” Savannah murmured, her fingers stroking through Lily’s curls. “For me. All for me.” She found Lily’s clit, swollen and throbbing, and circled it with a feather-light touch.

Lily shattered. Her first orgasm, brought on by her sister’s expert touch, crashed over her with the force of a tidal wave. She arched off the bed, a wordless scream tearing from her throat, her vision whiting out. Savannah held her through it, kissing her neck, whispering praises.

When the waves subsided, leaving Lily boneless and trembling, Savannah shifted. She kissed her way down Lily’s body, over her quivering stomach, the sharp jut of her hipbones, until she was nestled between her thighs. Lily propped herself up on her elbows, watching in awe as Savannah, her beautiful, confident sister, looked up at her with lust-darkened eyes.

“I want to taste you,” Savannah said, and then she did.

The first swipe...