Hayao blinked, puzzled. “What do you mean? What is it?” he asked, his voice a mix of curiosity and apprehension. But deep within, the young man felt a flare of arousal, and new blood stirred in his loins.

Yumi stood before Hayao, completely naked, her presence commanding despite the nervous flutter in her chest. At barely 20, she was a vision of voluptuous beauty—her "thicc" figure in modern parlance was a symphony of curves, with wide hips and a generous, round ass on full display. Her smooth, bare skin glowed, accentuating the swell of her thighs and the heavy bounce of her unrestrained breasts. Her dark hair cascaded over her shoulders, framing a face flushed with anticipation. She shifted her weight, one hip cocked, and turned slightly to give Hayao a better view of her backside.

"Hayao," she began, her voice low and sultry, tinged with a playful edge, "what do you think about my butt? Is it too big for you?"

Hayao sat frozen on the couch, his lean frame tense with a mix of awe and uncertainty. His eyes, wide and dark, traced the outline of her curves, lingering on the plump, heart-shaped swell of her ass. He swallowed hard, his Adam’s apple bobbing, and ran a hand through his tousled black hair. 

"No, Yumi," he said, his tone neutral but strained, as if fighting to keep his composure. "You’re very attractive. Your butt… it’s not too big. It’s perfect."

Yumi sighed, a sound heavy with exasperation and a flicker of disappointment. She turned fully to face him, hands on her hips, her bare breasts jiggling slightly with the motion. "God, Hayao, you’re always so damn polite. Can’t you just say what you really think?" Her eyes narrowed, smoldering with challenge. "I’m offering you my ass if you want it. Right here, right now. Do you want it or not?"

Hayao’s breath hitched, his mind reeling. The air between them thickened, charged with the weight of her words. He nodded dumbly, his lips parting but no sound escaping, his arousal evident in the tightening grip of his hands on his knees.

Yumi’s lips curved into a nervous, excited smile. She stepped closer, her bare feet sinking into the soft rug. "Okay, but… I’ve never done this before," she admitted, her voice softening with vulnerability. "I might not be good at it, so I’m sorry if I mess it up."

Hayao finally found his voice, hoarse with desire. "It’s okay, Yumi. You don’t have to apologize. I just… I want you."

Her eyes locked with his, a silent agreement passing between them. She sank to her knees in front of him. Her hands trembled slightly as she reached for his cock. It sprang up, thick and hard, the tip already glistening with precum. Yumi’s breath caught at the sight, her pussy clenching with a sudden, needy ache.

She leaned forward, her full lips brushing the head of his cock, and then took him into her mouth. Hayao gasped, a sharp, involuntary sound, as her warm, wet heat enveloped him. Her tongue swirled around the sensitive tip, tasting the salt of his arousal, and she sucked gently, hollowing her cheeks. Saliva pooled in her mouth, coating him as she bobbed her head, taking him deeper. The wet, slurping sounds filled the room, mingling with Hayao’s ragged breaths. She pulled back after a moment, his cock slick and gleaming, ready for what came next.

This was different to fucking her throat.

"Alright," she murmured, her voice husky. "Let’s do this." She stood, turning around to present her bare ass to him again. Her pussy was already glistening with arousal, and the tight pucker of her asshole was framed by the smooth, plump cheeks of her ass. Hayao’s cock twitched at the sight, his hands itching to touch her.

Yumi bent forward slightly, bracing her hands on the coffee table, the wood cool against her palms. She glanced back at him, her eyes dark with lust and a hint of fear. "Be gentle, okay?"

Hayao nodded, scooting to the edge of the couch. He positioned himself behind her, his hands settling on her hips, fingers sinking into the soft flesh. Her skin was warm, almost feverish, and he guided his cock to her tight entrance, the slick head pressing against her. Yumi tensed, her breath hitching, and Hayao paused, giving her a moment to adjust.

Slowly, she began to back into him, lowering her hips. The resistance was immediate—her asshole tight and unyielding—but with a deep breath, she pushed down, and the tip slipped inside. A pained whimper escaped her lips, her face contorting as she took him inch by agonizing inch. Hayao groaned, the vice-like grip of her ass around his cock sending a jolt of pleasure through him.

"Are you okay?" he asked, his voice thick with concern and lust.

"It hurts," Yumi gasped, her eyes squeezed shut. "But don’t stop. I need to give this to you." She reached up with both hands, cupping her heavy, bare breasts, and began rubbing them furiously. Her fingers pinched her nipples, tugging at them, a desperate attempt to drown the sharp sting in pleasure. Her ass clenched around him as she sank lower, taking more of his length.

Hayao watched, mesmerized, as his cock disappeared into her. Her cheeks jiggling with each movement, the sight was obscene and intoxicating. "How does it feel?" she asked, her voice trembling, strained with pain and effort.

"It’s so tight," Hayao rasped, his hands tightening on her hips. "So fucking good, Yumi."

She managed a shaky smile, encouraged by his words. "Can I keep going?"

"Please," he begged, his hips bucking slightly, burying himself deeper. Yumi yelped, the sudden thrust stretching her further, but she didn’t pull away. Instead, she began to move, sliding up and then down, her ass gripping him like a velvet glove. The pain was still there, engraved into the lines of her face, but it mingled with a growing heat, a raw, primal need.

Hayao matched her rhythm, thrusting gently at first, his cock sliding in and out of her slick, tight hole. The living room filled with the sounds of their coupling—the wet squelch of his cock in her ass, the slap of skin against skin, her soft moans and his low grunts. Yumi’s hands stayed on her tits, kneading them harder, her nipples stiff peaks begging for attention.

"God, I’m so full. You like this, Hayao?" she panted, glancing back at him, her hair sticking to her sweat-slicked forehead.

"Fuck, yes," he growled, his control slipping. "Your ass feels incredible."

Emboldened, the curvy girl sped up, her hips rocking faster, her ass bouncing on his lap. Hayao thrust harder, unable to hold back, each movement driving him deeper into her. She reached down between her legs, her fingers finding her clit, swollen and slick with her arousal. She rubbed it in frantic circles, her moans rising in pitch.

"I’m gonna cum," she whimpered, her body trembling. "Cum with me, Hayao."

He felt it building, the pressure coiling tight in his balls. "I’m close," he warned, his voice ragged.

With a few more thrusts, Yumi shattered, a loud cry tearing from her throat as her orgasm ripped through her. Her ass clenched around him, milking his cock, and Hayao followed, his cum spilling hot and thick inside her. They collapsed onto the couch, a tangled heap of limbs and sweat, their breaths heaving in the stillness.

Yumi turned to him, a lazy, satisfied smile on her lips. "Was that okay?" she whispered, cuddling against his chest.

Hayao wrapped an arm around her, still dazed. "It was perfect, Yumi. Fucking perfect."

They lay there, the afterglow wrapping them in a hazy warmth, the living room quiet once more—until Yumi’s eyes glinted with mischief.

"You know," she said, sitting up, "I’ve always wanted to try being on top. Think you’re up for it?"

Hayao grinned, his cock stirring again. "Hell yes."

She straddled him, guiding his hardening length back to her ass. This time, it slid in easier, her body more pliant, and she rode him with abandon, her tits bouncing wildly as they chased another peak.

Brother and sister surrendered to their forbidden passion. The luscious girl, her skin flushed and glistening with a fine sheen of sweat, straddled her brother’s lap, her voluptuous curves swaying with every rhythmic bounce. Her dark hair spilled over her shoulders, framing her face as she rode him, her tight ass enveloping his throbbing cock with an intensity that made his breath catch in his throat.

Hayao’s hands gripped her hips, guiding her movements as waves of pleasure rippled through him. The heat of her body, the slick friction of their union, drove him wild, but a deeper craving gnawed at him—a hunger for something more, something intimate and raw. His fingers tightened against her flesh, and he looked up into her eyes, his voice husky with need. 

“Yumi,” he rasped, “I want to cum in your mouth.”

Yumi’s rhythm faltered, her hips slowing as surprise flashed across her face. Her brows knitted together, and she shook her head, her lips parting in disbelief. 

“No, Hayao,” she said, her voice trembling with a mix of reluctance and disgust. “That’s dirty. You’ve been in my ass—I can’t put that in my mouth.”

Hayao’s gaze darkened, a flicker of impatience crossing his features. His hands stilled her hips, holding her in place as he met her protest with a sharp retort. “If it’s dirty,” he countered, his tone edged with frustration, “why did you let me put my cock in your ass in the first place? You didn’t seem to mind then.”

The older sibling’s cheeks burned with a deep flush, her breath hitching as she struggled to find a response. “It’s not the same,” she insisted, her voice quieter now, almost defensive. “That’s different. I won’t do it.”

Hayao’s expression hardened, his jaw tightening as he leaned closer, his voice dropping to a low, menacing whisper. “If you don’t,” he warned, “I’ll tell Mom everything. I’ll tell her all about this.”

Yumi’s eyes narrowed, a spark of defiance flaring within them. She searched his face, testing the weight of his threat, but the cold determination in his stare told her he wasn’t bluffing. Her shoulders slumped slightly, the fight draining from her as she let out a resigned sigh. Slowly, she lifted herself off him, her body mourning the loss of his heat as she slid down between his legs.

Hayao watched her, his chest rising and falling with anticipation. Yumi knelt before him, her nose wrinkling in distaste as her gaze settled on his cock—still hard, slick, and glistening with the evidence of their earlier act. The musky scent of her own dirty hole clung to him, a potent reminder of where he’d been. She hesitated, her lips trembling as she took a deep, steadying breath, steeling herself for what she was about to do.

With a tentative flick of her tongue, she brushed the tip, tasting the bitter, earthy tang of her own asshole. Her stomach churned, but she pressed on, her tongue swirling around the head in slow, deliberate strokes. She cleaned him lovingly, her movements sensual despite her reluctance, her eyes lifting to meet his. The sight was intoxicating—her full lips wrapped around him, her gaze locked on his with a mix of resentment and unspoken desire. It was an erotic tableau, charged with the taboo of their connection.

Hayao groaned, his head tipping back as pleasure surged through him. “God, Yumi,” he murmured, his voice thick with lust. “Your tongue… it’s so good.” His hands reached for her, fingers threading through her hair as he guided her, encouraging her to take him deeper.

Yumi’s lips stretched around his girth, the taste growing stronger as she worked her way down his shaft. She lapped at him, her tongue tracing every vein, every ridge, cleaning away the remnants of their illicit act. Her throat tightened as she took him deeper, the head of his cock brushing the back of her mouth, but she didn’t pull away. She kept her eyes on his, watching the way his features twisted with ecstasy, her own arousal stirring despite the circumstances.

Hayao’s hips twitched, his body responding to the wet heat of her mouth. “More,” he urged, his voice a strained plea. “Take it all, Yumi.” His fingers tightened in her hair, pulling her closer as she sucked harder, her cheeks hollowing with the effort.

The room filled with the soft, wet sounds of her ministrations, punctuated by Hayao’s ragged breaths. Yumi could feel him throbbing against her tongue, the pulse of his arousal growing more insistent. She worked him with a rhythm that matched their earlier passion, her tongue dancing along his length, her lips sealing around him as she drew him deeper still.

Hayao’s control began to slip, his breaths coming in sharp, desperate gasps. “I’m close,” he warned, his voice rough with need. “Don’t stop.” But as the edge of release loomed, he couldn’t resist taking more. At the last moment, his hands clamped down on the back of her head, fingers digging into her scalp as he thrust upward, humping her face with a sudden, frenzied urgency.

Yumi’s eyes widened, tears prickling at the corners as her throat protested the rough intrusion. She gagged, her hands instinctively pressing against his thighs, but Hayao’s grip was unrelenting. His cock slid in and out of her mouth, the pace relentless, the taste and sensation overwhelming her senses. Her muffled whimpers mingled with his groans, the air thick with the raw intensity of the moment.

“Fuck, Yumi,” Hayao cried out, his voice breaking as his climax hit. His hips bucked wildly, and he buried himself deep, cumming a river down her throat. The hot, thick flood of his release poured into her, each pulse forcing her to swallow or choke. Her body convulsed, her throat working frantically to take it all, tears streaming down her cheeks as she struggled against the onslaught.

Hayao held her there, his hips jerking with every spurt, until the last of his pleasure ebbed away. Only then did he release her, collapsing back onto the bed with a sated groan, his chest heaving. Yumi pulled away, gasping and coughing, her face flushed and streaked with tears. She wiped her mouth with the back of her hand, glaring at him through the haze of her disheveled hair.

“You’re such an asshole,” she rasped, her voice hoarse from the ordeal. “That was too much.”

Hayao grinned, unapologetic, his eyes gleaming with a mix of triumph and affection. “You loved it,” he teased, reaching out to pull her close. “Admit it.”

Yumi’s glare softened, a reluctant smile tugging at her lips as she let him draw her into his arms. “Maybe,” she muttered, nestling against him despite herself. “But you owe me next time.”

“Deal,” Hayao agreed, his voice warm as he pressed a kiss to her forehead, their bodies entwining once more in the afterglow of their shared transgression.

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