Chapter 18: The Sibling's Reunion
The afterglow wasn’t a glow at all. It was a creeping chill, starting in Kushina’s gut and spreading outwards like frost on a window.
Lying across Naruto’s lap, her back against the hard plane of his stomach, she was trapped in a warmth she now understood was all wrong. The physical heat of him, the solid reality of his body beneath her, was a blasphemy. She could feel every ridge of his abdominal muscles, the coarse trail of hair leading down. And pressed against her lower back, unwavering, was the persistent, insulting hardness of him. It hadn’t softened. It didn’t even seem to breathe like a normal part of a man. It was just… there. A permanent, monstrous fact.
Endless stamina.
The words from the Sage Mode brochure, sterile and clinical, now echoed in her head with a horrific, flesh-and-blood truth. This wasn’t human. What she had just done, what she had just felt, what was still pressed against her…
Her eyes, wide and unblinking, stared at the hydraulic bed frame. It was so clean. So sterile. Like an operating table.
And on this table, she had…
“I want it back on.”
Tayuya’s voice cut through the hum of the climate control. It was calm. Matter-of-fact. A simple statement of need.
Kushina’s head lolled to the side, her neck feeling boneless. She watched as Tayuya, still naked, her skin gleaming with a faint sheen of sweat under the LED chandelier, looked at Naruto. There was no shame in her daughter’s face. Only a fierce, focused hunger.
Naruto’s hand, which had been idly stroking Kushina’s hip, stilled. He looked at Tayuya, and a silent understanding passed between them. An understanding forged over three years of hidden exploration, of shared sin.
“Okay,” he said softly.
He shifted beneath Kushina, making her gasp as the movement rubbed his erection against her spine. He reached over the side of the bed, his arm extending toward a small, minimalist cabinet Kushina hadn’t noticed. It blended into the wall. He opened a drawer.
The sound was a soft snick in the silent room.
When his hand emerged, it held a collar. Simple, black, polished leather. And attached to it, a fine, silvery chain leash.
Kushina’s breath hitched. A noise escaped her, a pathetic whimper stuck in her throat. This was a new layer. Another descent. Blindfolds were one thing—a deprivation of sight. But this… this was a symbol. Ownership. Submission. It was something you saw in the furtive, illegal underground holovids, the ones the authorities sometimes raided. It was filthy.
Naruto sat up a little, gently guiding Kushina to slump to the side onto the cold, starched sheets. He moved with an easy, predatory grace off the bed. Tayuya watched him, her blue eyes bright.
“Come here,” he said, his voice not unkind, but firm. A command.
Tayuya slid off the bed and knelt on the floor before him. The concrete was cold under her knees. She didn’t flinch. She tipped her chin up, exposing the long, elegant line of her throat. She looked like a sculpture, a stunning offering.
With deliberate, almost ritualistic movements, Naruto fastened the collar around his sister’s neck. The buckle clicked, loud in the silence. He let the leash dangle for a moment, the silver links catching the cold light.
Kushina pushed herself up on her elbows, her red hair a tangled curtain around her face. “What… what are you doing?” Her voice was a shattered thing.
Tayuya glanced at her, a smirk playing on her lips. “Learning, Mom.” The word ‘Mom’ was a deliberate barb, a twist of the knife. “Watch.”
Naruto gave the leash a gentle, testing tug. Tayuya’s breath caught, not in pain, but in anticipation. A faint pink bloomed on her cheeks.
“On all fours,” Naruto instructed, his tone shifting into something darker, more authoritative. The charismatic escort was gone, replaced by something else entirely.
Tayuya obeyed instantly. She lowered herself onto her hands and knees on the concrete floor, her back arching elegantly, her head bowed. The leash pooled on the ground beside her.
Naruto stepped closer, his shadow falling over her. He looked down at his sister, his expression unreadable. Then he nudged her thigh with his foot. “Wider.”
A shudder ran through Tayuya. She spread her knees further apart on the hard floor.
Naruto’s cock, that impossible, unchanging fact, stood rigidly before her face. He took the leash in one hand, wrapping it loosely around his knuckles. With his other, he guided himself, the broad, flushed tip nudging against Tayuya’s lips.
“Worship it,” he said, the words flat. An order.
Tayuya didn’t need to be told twice. She opened her mouth, her pink tongue darting out first to lick a long, slow stripe from his base to the tip. She took him into her mouth, not all at once, but with a slow, deep devotion that made Kushina’s own mouth go dry for a different reason.
Kushina watched, paralyzed. She watched her daughter, her own flesh and blood, her beautiful, brash Tayuya, take her brother’s cock into her mouth with a reverence that was utterly obscene. She saw Tayuya’s lips stretch, saw the wet, slurping sounds begin as her head started to bob, slow and deep. She saw the muscles in Tayuya’s neck work, saw her eyes flutter closed in what could only be described as bliss.
This is a sin. The thought slammed into Kushina’s brain, cold and absolute. This is a deep, rotting, unforgivable sin.
It wasn’t about the mechanics. It was the love in it. The utter lack of shame. Tayuya wasn’t just performing a crude act. She was communing. Her bound hands were clasped behind her back, her body rocking slightly with the rhythm of her sucking. A soft, needy moan vibrated around Naruto’s length.
Naruto looked down, his hand coming to rest on top of Tayuya’s spiky hair. He didn’t fuck her mouth with violent thrusts. He let her work, let her worship. His thumb stroked her scalp almost affectionately.
“That’s it,” he murmured, his voice thick. “Take it all. Show me how much you love your brother’s cock.”
Tayuya groaned, the sound desperate and eager. She took him deeper, until Kushina saw her nose press into the dark blonde hair at his base. She held it there, her body trembling, before pulling back with a wet, gasping breath, a string of saliva bridging her lips to his shining tip before she dove back down.
Kushina’s mind broke.
It wasn’t disgust that flooded her. It was a terrifying, soul-crushing envy. A yearning so profound it felt like a physical wound. Mikoto knew. Tayuya knew. They had this. They had him. This perfect, forbidden knowledge that turned the sterile world into a lie. They had stepped into the secret, vibrant, filthy truth while she had remained in the empty, polite fiction.
And she wanted it. God, she wanted that shameful devotion. She wanted to be on her knees. She wanted to have that look on her face. She wanted to know.
She was freaking out. Her heart hammered against her ribs like a trapped bird. Her skin felt too tight, too clean. The sight before her wasn’t just arousal—it was a devastating mirror held up to her own barren life. Every slurp, every gasp, every tender stroke of Naruto’s hand in Tayuya’s hair screamed of a intimacy Kushina had never dared dream of. It was sinful. It was wrong. It was the most real thing she had ever seen.
And she was drowning in the need for it.
A sob caught in her throat. It was half despair, half awakening.
Naruto’s eyes, a piercing, knowing blue, slid from Tayuya’s fervent work and locked onto Kushina’s. He saw her panic. He saw her hunger. He saw the war inside her shattering into a single, desperate surrender.
He gave the leash a slight pull, making Tayuya release him with a wet pop. Tayuya looked up, her lips swollen and slick, confusion in her lust-clouded eyes.
Naruto never broke his gaze from Kushina. A slow, predatory smile touched his lips.
“Your turn,” he said, his voice a low promise that vibrated in the sterile air.