Cover of The Breath of the Sun

The Breath of the Sun

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Story is set after the events of the Demon Slayer manga. Tanjiro has continued traveling the lands following his defeat of Muzan, learning new techniques and training. He is now 21 years old. With the demons defeated, he returns to the butterfly estate to rest and retire for now. Shinobu survived in this timeline. Unbeknownst to him, Kanao (21 y/o) and Shinobu (41 y/o) have been gaining weight in their retirement. They practice the new breath technique, "heavy breathing" which requires the user to gain enormous amounts of weight. While Tanjiro stays with them, they make him gain weight and get fatter in order to become a master of heavy breathing and also to become a sufficiently sized husband for Kanao.

Chapter 4: A Titanic Temptation

The world had settled into a new, soft shape around him. His days were measured not in hours, but in meals, a continuous, rolling cycle of satiation that left him in a permanent, drowsy state of surrender. He was a fixture of the estate, moved from cushion to bath to bed like a precious, bloated relic. His body, now a solid 500 pounds, had lost all pretense of its former self. He was a monument of flesh, his belly a vast, hanging shelf that rested heavily on his thighs even when seated, his breasts soft and full, his arms and legs thickened pillars cushioned by layers of fat. He breathed in shallow sips, the Heavy Breathing technique now less a martial art and more a necessary method to simply inflate his lungs beneath the crushing weight of his own chest.

Then, the floorboards groaned in a different way.

The tremor that ran through the polished wood was seismic, a deep, rhythmic shudder that made the bowls on the low table chime softly against each other. Tanjiro managed to lift his heavy head, his multiple chins compressing against his chest. Shinobu filled the doorway, a mountain of silk and flesh. She must have been eight hundred pounds, a staggering, beautiful leviathan. Her silk robe, a deep indigo, was open at the front, barely containing the tremendous cascade of her breasts and the profound globe of her stomach, which preceded her into the room like a moon.Her hair, streaked with silver, flowed over her shoulders. She moved with impossible, graceful slowness, each step a deliberate conquest of space and physics.

Sumi, Kiyo, and Naho scurried to place a specially reinforced, wide cushion beside him. Shinobu lowered herself with a deep, satisfied sigh, the entire room seeming to settle as she did. Her side spilled against him, warm and impossibly soft, her own belly a continent that overlapped the edge of the table.

“Look at you,” she cooed, her voice a low, honeyed thrum. One hand, plump and smooth, came to rest on the great curve of his stomach. She patted it, the sound a deep, solid thump thump thump.“Five hundred pounds.My beautiful boy. You’ve accepted your true form so well.”

Her praise flooded him with a warm, shameful pleasure. She reached across him, her arm a soft weight on his chest, and dipped her fingers into a bowl of steaming white rice. She gathered a handful, squeezing it into a dense clump, then dragged it through a rich, amber broth. She brought it to his lips.“Open.”

He obeyed without thought. The rice was hot, the broth savory and rich.He chewed slowly, the effort significant.

“Swallow,” Shinobu commanded softly, her other hand sliding beneath the table. Her fingers found the inner softness of his colossal thigh, kneading the warm fat there.“Let it become part of you. All that goodness, settling into your cells, making you heavier, more substantial.” Her hand inched higher, a slow, claiming exploration.“Kanao, come here. See how well he takes his nourishment.”

Kanao was already there, kneeling opposite Shinobu, her plump face flushed. She watched, enraptured, as Shinobu fed him another handful, then another. Tanjiro’s jaw ached. A deep, stubborn fullness, a leftover from the last feeding, pushed back against the new influx.He faltered, a piece of rice clinging to his lip.

“He’s struggling,” Shinobu observed, not with concern, but with dark delight.“His throat is tight. It needs softening.” She released his thigh and, with startling strength, pulled his head towards the breathtaking swell of her chest.The world became a perfumed darkness of warm, yielding flesh. She guided his mouth to a large, dark nipple, already stiffened. “Suck,” she whispered, her voice vibrating through her body into his very bones.“The milk will help. It’s designed for this.”

He whimpered, a muffled sound lost in her softness. Then he began to suckle.A thin, sweet cream hit his tongue.It was easier than solid food. He swallowed in reflexive pulls, his body responding to an infantile instinct. Shinobu moaned above him, her fingers tangling in his long red hair.“Yes.Good boy.Drink your fill. Make yourself heavier for me.”

While he nursed, Kanao moved. He felt her hands on the waistband of his stretched fundoshi, pulling it down over the steep slope of his lower belly.His cock, thick and hard, sprang free.He heard her soft, eager gasp.

“Look at him, Kanao,” Shinobu purred, her hand now stroking Tanjiro’s heaving side as he fed.“So fucking fat.So helpless. He can’t move unless we move him.He can’t eat unless we feed him. He’s perfect.” She shifted, allowing him a gasp of air before pushing his mouth back to her breast. “Show him what his perfect body does to you.”

Kanao needed no further encouragement. He felt her hot, wet mouth engulf him. Her tongue swirled around the head before she took him deeper, her own soft belly pressing against the side of his massive thigh. The sensation was blinding—the rhythmic pull at her breast, the electric pleasure between his legs, the overwhelming pressure in his gut. Shinobu fed him a ball of sweet red bean paste with her free hand, pushing it past his lips as he suckled.

“He’s going to come,” Kanao mumbled, her mouth full of him.“Let him,” Shinobu said, her voice hard and commanding. “Let him pump his filthy load right down your throat. Let him climax while he’s full of my milk and bean paste. Let everything mix inside him.”

The triplets circled, adding a plate of glazed mochi to the table, pouring more broth. Their presence was a blur of soft bodies and gentle hands, a perimeter of perpetual service.Tanjiro’s breath hitched. The coil in his groin tightened beyond bearing.His swollen belly clenched in a hard, protesting spasm. He tore his mouth from Shinobu’s breast with a ragged cry.

“Oh god—“

The orgasm ripped through him, a seismic wave of release that made his entire mountain of flesh convulse. He came in thick, pulsing jets down Kanao’s throat, his back arching as much as it could, a whale breaching in slow motion. Kanao drank him down, milking him with soft, relentless swallows until he was spent, collapsing back into Shinobu’s embrace, gasping like a beached fish.Shinobu laughed, a sound of pure, wicked triumph. She cradled his head, kissing his sweaty forehead, his puffy cheeks. She grabbed a handful of his own flabby breast and squeezed. “Look at this,” she said to Kanao, who wiped her mouth, eyes shining. “He’s becoming a proper little cow himself.”

Tanjiro could only pant, the world spinning, his body a landscape of exhaustion and grotesque satisfaction.

Shinobu traced the deep crease where his belly met his thighs, the places only she and Kanao could now reach. “Five hundred is a good start,” she mused, her voice dropping to a conspiratorial whisper. “But a true master of Heavy Breathing needs a foundation of at least a thousand. A base of immovable strength.” She looked at Kanao, then down at Tanjiro’s glazed eyes. “We’ll double this weight by year’s end.You’ll be so big, you won’t remember what your own knees look like. You’ll just be our beautiful, blubber husband. Won’t that be nice?”

He tried to form a word, a thought of resistance, but all that emerged was a soft, guttural sound of assent, lost in the scent of food and sex and the crushing, comforting weight of inevitability.

That sound became his new voice. It was a language of satiated grunts, soft groans under kneading hands, and helpless sighs when another bite was presented. Shinobu’s pronouncement wasn’t a prediction; it was a law of physics enacted upon his body. The very next morning, the regimen shifted from deliberate to absolute.The triplets no longer fed him in meals. They fed him in perpetuity.

Sumi would be there at dawn with a thick, calorie-dense shake, the straw placed between his lips before he was fully awake.He drank in his sleep. Kiyo would follow with a tray of warm, buttery okonomiyaki, tearing off rich pieces and placing them directly onto his tongue as Sumi massaged his throat. Before the last savory note faded, Naho would arrive with a bowl of sweetened anko and glutinous rice, the sticky paste clinging to the roof of his mouth.There was no pause, no empty moment. His stomach, stretched into a vast, numb cavern, simply accepted.The goal was no longer fullness. It was a state beyond that—a continuous, seamless packing of mass.

Kanao watched it all, her own soft hands often joining. She would nestle against the sloping shelf of his side, her fingers tracing the new, deep stretch marks that bloomed like silver vines across the pale expanse of his belly. “It’s working,” she’d whisper, her breath hot against his ear. “You’re getting so deep.I can feel it.” Her touches grew bolder, more possessive. One afternoon, as Naho quietly spooned a rich liver pâté into his mouth, Kanao’s hand slipped beneath the hem of his robe. She found his cock, half-hard from the constant attention and overload.She began to stroke him with a slow, proprietary rhythm.

“He likes that,” Shinobu observed from her own mountain of cushions.She wasn’t eating.She was presiding. “Look at his belly jump. Even his fat is getting turned on.” She gestured to Sumi.“Give him the egg custard now.The protein will go straight to his muscles. What’s left of them.”

Kanao’s pace quickened. She used her thumb to smear the bead of precum over his head, the slick sound obscene in the quiet room. Tanjiro moaned around the mouthful of custard, a shudder running through his bloated frame. He was trapped between the relentless hand on his cock and the spoon at his lips. His hips gave a feeble thrust into her fist.

“That’s it,” Kanao coaxed, her voice husky.“Come on.Give it to me. Pump it out.” She leaned in, biting his earlobe.“Come all over my hand, you fat fucking pig. Do it.”

The vulgarity, so stark against her gentle features, was the final trigger. His climax was a weak, dribbling affair, a pale imitation of the forceful jets from months before. It spilled over Kanao’s fingers and onto the rolls of his own lower belly. He gasped, his body sagging deeper into the floor. Sumi wiped his chin with a damp cloth and immediately resumed feeding him a sweet rice cake.Shinobu smiled.“Perfect.The energy is being redirected inward. The gluttony, the lust, the surrender—it’s all fuel.” She nodded to Kiyo.“Bring the measurements.”

The tape now had to be held by two of them. It encircled the widest part of him, a circumference that required Kanao to lift the heavy, pendulous swell of his gut.The number was whispered, not announced.It didn’t matter. He felt the truth in the way his body now rested on the floor. He was becoming a lake of flesh, spreading outward, losing definition.A few weeks later, he failed to rise. It wasn’t a refusal, but a physical impossibility. When the triplets tried to haul him upright for his bath, his legs, swollen and immense, buckled under the tonnage of his torso. He collapsed with a soft, thunderous noise, a beached leviathan. Shinobu clapped her hands together, delighted.“At last!The foundation is complete. He’s grounded.” From that day, he was moved on a reinforced litter, carried by the three girls whose small frames strained with the Herculean task.

His world shrank to the room, the litter, and the hands that tended him.Baths were administered with cloths and buckets. His hair was washed as he lay on his back, his head cradled in a basin. He was turned to prevent sores.The feeding never stopped, not even during these ministrations. One night, Shinobu visited him alone.The triplets had been dismissed.Kanao was asleep.

She loomed over him where he lay on his pallet, a continent gazing down at a fallen country. “The final lesson begins,” she said, her voice devoid of its usual mischief.It was pure, clinical command. She lowered her immense bulk beside him, the matting groaning. Her hand, heavy and warm, settled on the dome of his belly.“Heavy Breathing is not about movement.It is about absolute presence. About density.Feel the mass you have become.Feel the anchor of it.”

She pressed down. The air wheezed out of him.“Now, breathe in.Not with your lungs. With your whole body.With your fat.”

He tried. He sucked in a breath, but it was thin, panicky.“No,” she chided, her fingers digging into the softness. “You are not a man breathing.You are a landscape settling.Let the air sink. Let it fill the spaces between your cells.Make yourself heavier with it.”

He focused past the panic, past the shame. He imagined the air not as life, but as liquid lead, pouring into him, seeping into the vast reserves of fat and flesh. His breathing slowed, deepened, became a profound, visceral process he felt in his distended belly, in his thickened neck. A strange calmness spread through him—a stillness born of absolute, immovable weight.

Shinobu’s eyes glittered in the lamplight.“Yes.There it is. The core of it.” Her other hand slipped between his legs, which now lay perpetually open under the great mound of his stomach. He was already hard, a pathetic, eager response to any touch. She gripped him, not with affection, but with assessment.“This too is part of the technique.A release of pressure. A transfer of energy.” She stroked him once, twice, her touch impersonal and efficient.“Do it. Breathe heavy, and come.”

He did.He kept that deep, settling breath as the sensation built. He came silently, a weak trickle over her fingers, his massive body utterly still but for the faint tremor of release.He was not participating.He was a site where a function occurred.

She wiped her hand on his thigh.“Good.You have begun to understand. Your mind is finally catching up to your body.” She leaned over, her immense breasts enveloping the side of his face, and kissed his forehead.“A thousand pounds will be your graduation weight. You will be a master of stillness.A perfect, heavy husband for Kanao. And proof of my greatest work.”

She left him then, lying in the cool silence, the smell of sex and his own overwhelming body thick in the air.He breathed, heavy and deep, feeling the floor embrace him completely. He did not think of escape.He thought only of the next breath, and the profound, grounding weight it would bring.

SHINOBU'S PLAN UNFOLDS.

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