Even though he called it "the effect of the ingredients," Ryuji knew full well—just his cooking alone wasn't enough to instantly convert a level-headed girl into a lovestruck mess, let alone get her to throw herself at him and beg for that.
If Erina had used some ultra-rare ingredients from the One Piece world, maybe there'd be a sliver of possibility. But even then, it'd just be a catalyst, nothing more.
If someone didn't already have those thoughts or desires to begin with, no amount of magical food would change their mind.
Especially when the aftertaste had already faded—there was no lingering influence to speak of.
Shinobu saw that clearly. If she hadn't already gotten the pleasure of sex over the past few days, she would've returned to normal shortly after eating too.
So no, this wasn't about aphrodisiacs from Food Wars! miraculously working. It wasn't the seasoning. It was her heart.
Still…
"Even if you want to be loved… this is way too fast," Shinobu murmured, glancing at Mitsuri, who was still tightly hugging Ryuji.
"Aren't you supposed to… at least go on a date or two first?"
But the now-fully-determined Mitsuri screamed in protest:
"No! What if Ryuji-san runs away?!"
"I won't," Ryuji said, patting her head.
"I told you—I'll have many wives. You're one of them now, just like Shinobu."
A man of the harem must never run from battle.
A harem man… must transform!
With complete sincerity, Ryuji reached into the air and mimed grabbing an invisible "Harem Transformation Device," solemnly beginning the sacred transformation ritual in his heart.
He activated the Harem mode transformation.
He adjusted his hormone levels, optimized the blood circulation to his dick, cleared any blockages in the sponge-like tissues using secret blood-energy techniques, and even enhanced sperm production using Life Return principles.
From body to soul, Ryuji was fully prepared to become a true man of the harem!
"Hmm… this really is…"
Shinobu couldn't help pressing her finger to her lips, watching Ryuji now fully prepared to carry Mitsuri off and do… that.
She hesitated for a moment.
Then asked something truly shameful.
"So… have you learned the Breathing Style of Mating yet?"
As soon as she said it, she felt like her conscience had been devoured by dogs.
The Breathing Styles were supposed to be sacred techniques used by Demon Slayers to slay evil demons… and here she was… defiling them like this.
She tried to rationalize it.
If it's for recruiting Ryuji-sama into the Corps, to help defeat demons… maybe it's okay?
But using this excuse to trick Mitsuri? Even she felt a little dirty.
"Breathing… what now?"
Mitsuri tilted her head, completely clueless. She even tapped her finger against her lips.
Her expression was one of pure, unfiltered innocence.
Shinobu sighed. It was too late now.
"It's a special breathing technique used during intimate moments between married couples… along with… well… compatible poses."
If she was going to hell, she might as well go all-in. She said it straight, not holding back.
"Uuuhh…"
Mitsuri's cheeks flushed red again.
She had definitely never learned that before.
"Wait... Is that really a thing?!"
Mitsuri looked skeptical, frowning slightly as she stared at Shinobu.
At that moment, Shinobu silently offered a heartfelt apology to their Lord in her mind, then spoke calmly:
"Yes, it exists. Otherwise, how do you think our frail lord managed to father children? And so many daughters at that?"
Daughters?
Ryuji's eyes suddenly lit up with intense curiosity.
Standing off to the side, Mai took a long sip of tea and muttered with a deadpan expression,"None of his daughters are over twelve."
"...Oh."
Ryuji immediately stopped his train of thought.
Shinobu, puzzled by the strange exchange between Ryuji and Mai, quickly redirected her attention back to Mitsuri. With solemn determination, she declared:
"That's why—you need to learn the Mating Breathing Style first!"
Inwardly, Shinobu was already offering apologies to generations of Demon Slayer Corps predecessors.
Forgive me, everyone! I swear… this is for the good of humanity! For the future of the Corps!
She wasn't completely against Mitsuri and Ryuji being together. But knowing Ryuji's dominant nature and the uncertain future of a polygamous relationship, she had to test Mitsuri's resolve—before things went too far.
"Hmm..." Mitsuri's expression dimmed slightly. The anxious excitement on her face faded away.
Shinobu let out a small breath of relief—
—but then Mitsuri suddenly lit up again with a bright, innocent smile.
"But can't you just teach me, Shinobu?! You show me how the breathing style works, and I'll just watch! Then you teach me the chants and techniques—I'm a fast learner! I'll master it in no time!"
Mai nearly choked on her tea, while Shinobu froze in place, stunned by Mitsuri's wide-eyed, sugar-sweet delivery of such an utterly scandalous suggestion.
"...That's actually a pretty good idea." Ryuji nodded with zero shame.
After all, the fastest way to find out if a girl is open to… group sex… is to have her experience it directly.
And that's precisely what he intended.
This was a flawless strategy—straight to the point, no need for excessive probing or discussion. If she's truly okay with it, they'll know immediately.
"Ah—I, um—wait…"
Shinobu finally managed to speak, but her voice faltered as she turned from Ryuji to Mitsuri, then back again, unsure if she'd fallen into some bizarre fever dream.
But by then, Ryuji had already picked her up and slung her over his shoulder, striding confidently toward his room.
"Ryuji-sama! P-Please put me down! Ryuji-sama! Mitsuri's just being impulsive, she doesn't understand—wait—!"
She flailed her arms, punching his back in protest, trying to knock some sense into him.
"Isn't this a brilliant idea? Hahahaha!"
Ryuji's booming laughter echoed through the hallway.
Behind him, Mitsuri clung to his arm happily, skipping beside him like a child unaware of the chaos ahead.
Still seated at the table, Mai let out a long, exasperated sigh.
"Why… of all people… did I have to choose him?"
Thinking back, she still couldn't believe she'd given in and made that decision—to let this walking disaster be her partner. And yet, Ryuji really was the only choice she had left.
"Seriously… would it kill him to act a little more restrained?"
She twisted her fan in her hands, as if imagining she were wringing Ryuji's neck instead.
But despite her frustration, she didn't move to stop him.
Because deep down, Mai understood Shinobu's real intention.
That guilty look in Shinobu's eyes, the way she hesitated—that was something Mai had seen too many times. That burdened sense of duty. That silent desperation.
"What a miserable world this is, huh..."
She muttered under her breath, helpless.
Meanwhile, Ryuji remained completely unaware of Mai's inner conflict. Or perhaps, not entirely unaware.
After all, he and Mai had an unspoken agreement—he wouldn't go all the way with her until he traveled to her world and helped restore the pride of the Shiranui Clan.
It wasn't exactly a formal contract, but Ryuji knew this was her condition.
She needed closure.
Because no matter how much she tried to deny it, Mai couldn't hide the fact that Ryuji was special to her. If Ryuji ever bothered to act cold and aloof, she'd probably already be doting on him like she once did with Andy.
But Ryuji never faked anything. He didn't hide his desire, his ambitions, or his harem goals.
Which made it impossible for Mai to fully embrace him.
Whenever she saw him, she couldn't help but turn into a stronger, angrier version of herself—both figuratively and literally.
In more ways than one, really.
But at this moment, none of that mattered.
Ryuji's full attention was now on Shinobu!
When placed on the bed, Shinobu attempted to resist, clutching her clothes with flushed cheeks as she glared at Ryuji, her tone sharp.
"Ryuji-sama! What exactly are you doing?! I may have agreed to let you take other women, but this is—this is just too much...!"
Her face burned too hot to finish the sentence, but Ryuji, acting on instinct, cupped her chin and captured her lips in a kiss. Though the faint taste of their recent meal lingered, the seasonings from Food Wars's world reignited the restless flutter in her chest that had only just settled.
"Even if—"
She tried to speak, only to realize with shock that, in the span of that kiss, Ryuji had somehow already stripped her upper half bare!
Damn this kimono for being so easy to remove!
Not that Ryuji was particularly skilled with women's undergarments—usually, the women themselves handled that part.
"Ryuji-sama! This is too much, I—!"
Another kiss swallowed her words. Her struggles against his muscular frame were futile; even scratching at him only seemed to amuse him further.
So when his lips trailed down her neck, one hand kneading the soft swell of her chest, she could only sigh in defeat and mutter her verdict:
"...Baka!"
Ryuji chuckled, nipping at the hardened peak of her breast—now stiff from excitement—and savoring its unique sweetness. Ignoring her half-hearted protests, he unfastened the rest of her clothing, revealing the delicate, pink-hued sanctuary below, which, despite enduring his relentless attention, remained as fresh as a maiden's.
A trickle of nectar already glistened between her thighs. Though Shinobu refused to admit it, Mitsuri's wide-eyed, innocent observation only stoked her arousal further.
Fear, anxiety, shame—all of it manifested physically.
Ryuji wisely avoided clichés like "Your body betrays you." Right now, saying anything would make Shinobu clam up entirely!
"Ryuji-sama! Please—"
Before she could finish, Ryuji took out his cock. Mitsuri, kneeling nearby with a face as red as a tomato, instinctively covered her mouth at the sight.
After his training in One Piece world Ryuji was monstrously endowed—and this was her first time seeing a dick!
"Ah! It really does look like a pestle for grinding garlic!"
Her innocent exclamation made Shinobu squeeze her eyes shut. Being ravished in front of someone so pure as Mitsuri was more than her pride could bear.
She'd prepared herself for Ryuji leaving her room to seek other women—not for him to bring them to her!
"Ngh...!"
A stifled whimper escaped as Ryuji sheathed himself inside her. Thanks to his dragonfire healing, Shinobu's body reset after each encounter, leaving her perpetually "virgin"—her passage untouched, her muscles only growing tighter with time.
Which meant that, no matter how accustomed she became to the pain, the initial penetration always tore a startled cry from her lips.
This time, to avoid scaring Mitsuri, she bit down on his shoulder instead.
But Ryuji, ever the brute, drove straight into her deepest core.
"Ahn~! Ryuji-sama! R-Ryuji—!"
"Ahhn~ Ahh~ Ahh~"
Pah!* Pah!* Pah!*
Shinobu's head snapped back, her nerves alight with pleasure-pain so intense it stole her voice. Undeterred, Ryuji began pistoning into her, reveling in the scorching heat of her body—twice as tight as usual under Mitsuri's wide-eyed scrutiny.
The sight of Shinobu's shame-twisted expression only fueled him further.
"Owww~!!! Ahnnnn~!"
"An~ ahh~ I can't breath! It's hitting me deep inside!!! Ohh~ ohh~ ohhh!!!!" she kept moaning.
"AAAhhhhnnnn~!!!!!!! Ryuji-sama~!!!!!!!"
"Ahn~! S-Slow down... I can't—!"
The relentless pace shattered her attempts to steady her breathing technique. She couldn't even inhale properly!
"Ahn… please, gentler… my breathing… nngh!… is...ah...going to be disordered..."
Haaah*! Haaahh*! Haah*!
Every thrust sent darkness flickering at the edges of her vision; her heart hammered as if Ryuji were striking it directly.
It feels very good—but it also hovering on the brink of death.
The thought cooled some of her humiliation and shame. After all, this was precisely why she'd urged Ryuji to take more wives.
Moreover, after she had sex with Ryuji, she also visited other women. But even for a man like Uzui Tengen who could satisfy three wives, his wives also revealed the other party's details, that it was only two or three hours, and a handful of releases, with most of that time spent on foreplay.
No one matched Ryuji's brutal endurance, his ability to maintain a single, punishing rhythm from start to finish.
When she'd mentioned this, Uzui's wives had actually looked... envious.
Not that they wanted to "switch plugs"—their marriage was happy—but purely as women, they understood the pleasure and were envious.
And compared to Shinobu's fragile body, Mitsuri's godlike physique was...
"Ryuji-sama... truly needs someone like Mitsuri," Shinobu admitted silently. "A girl sturdy enough to endure him without Breathing Techniques."
She, who risked cardiac arrest from his restrained thrusts, versus Mitsuri, who—
A gasp cut off her thoughts as Ryuji struck her core again. But this time, Shinobu steeled herself. Meeting Mitsuri's concerned gaze—the girl had been counting her labored breaths—Shinobu discarded her shame.
The thought made her take another shuddering breath, though her attempt to maintain her breathing technique when Ryuji's next thrust struck her deep in her womb.
With a sigh, she wrapped her legs around Ryuji's waist in a scissor-lock, yanking his face into her heaving chest allowing him to continue biting and licking her peaked nipples.
But she gave him no room to breathe.
Hips lifting in time with his thrusts, she clenched around his dick, rolling her pelvis in subtle undulations....
This... is my counterattack.
Months of exhaustive "research" had taught the medic-turned-lover crucial truths—which inner contours made Ryuji's dick twitch uncontrollably, which ridges stimulated him without overwhelming her. Now she used that knowledge ruthlessly, angling her hips to grind his most sensitive tip against her least reactive walls while cutting off his oxygen supply with her breasts.
The effect was immediate.
Pah!* Pah!* Pah!*
"Owww~!!! Ahnnnn~!"
"Ahhn~ Ahh~ Ahh~"
"Ry..Ryuji-sama~ you are sooo bigggg!!!! filling me so completely, ahhn~ ahhh~, it feels so full inside mmeeee~~~" shinobu's kept trembling with the desire and pleasure that she was feeling.
Ryuji's thrusts grew erratic as hypoxia set in, his cockhead trapped in a velvet vise of deliberately mismatched textures. Shinobu's inner muscles worked like a master torturer's tools—alternately squeezing and fluttering along precise sections of his shaft while denying him air.
Ryuji could feel her tightening around him even more, showing signs of her own release.
"Cum with me" he muttered, increasing his thrusts.
"Ahhaaa~ahhh~ah...ahhhhhhh!!!!!! please... I'm so close....mmnn~!!!!!"
Shinobu was losing herself in the pleasure, her body was moving on its own matching his thrusts.
"Mmnn~Yes!... ahhn~harder!!!!"
Their movements became faster, desperate, frenzied, each chasing their own release.
When release came, it was mutual annihilation. Both he and Shinobu reached their climax together.
"AHHHHHNNNN~!!!!!!!!"
Shinobu screamed as she reached her orgasm, her body body trembling, her inner walls clenching around him tightly.
Haaah*! Haaahh*! Haah*!
Shinobu's back arched like a bowstring as she also reached her climax, her scream muffled by the fact that Ryuji had literally lifted her off the ground by her breasts in his climax. Scalding release painted her stomach and abused nipples as they collapsed in a tangled heap.
As Dragonfire's flames licked over Shinobu's trembling form, she seized her chance. Sticky fingers grabbed Mitsuri's wrist, pulling the wide-eyed Love Hashira close despite the cooling evidence of Ryuji's climax still webbing between them.
"Listen well," Shinobu panted, the dragonfire's heat flushing her skin. "Mitsuri, if you truly wish to become Ryuji-sama's wife, then listen carefully..."
Though the crimson dragonfire didn't actually burn her skin—instead radiating a paradoxical, soothing warmth—its heat was still intense. Combined with the sweat from their earlier... activities, Shinobu's voice carried an unsettlingly solemn tone, as if imparting final wisdom.
Mitsuri stood frozen, utterly bewildered. She'd seen how thoroughly Shinobu had been... engaged and, well, enjoying herself, but she hadn't expected this level of aftermath!
Her fingers twitched nervously at the lingering slickness on her palms as she nodded like an overeager student. "Y-yes...?"
She was a little confused about the situation!
"To put it plainly, Ryuji-sama's... capabilities are beyond human limits. To keep up—let alone satisfy him—we must rely on Breathing Techniques and specialized methods. What I just demonstrated was the 'Mating Breath Style'..."
Shinobu's entire body burned with shame as she spoke, her thighs instinctively clamping around Ryuji's fingers—still busy cleaning her filled pussy—with enough force to trap them.
Between whispered instructions to Mitsuri and the mortifying task of wiping away evidence with a damp cloth, she somehow managed to stand with Ryuji's helpful hands steadying her waist.
Not that Ryuji was paying attention. His focus had already shifted—evidenced by the renewed erection pressed against Shinobu's butt checks.
Since Shinobu had already made up her mind, she decisively flipped Ryuji—who had been gripping her hips, ready to take her from behind again—onto his back. Mounting him, she took a deep breath and spoke.
"Ryuji-sama... prefers to be on top. But we can use that against him—playing into his pride by taking control ourselves..."
Just like how he made sure you were watching.
As she spoke, Shinobu inhaled deeply, her chest rising.
"Watch my breathing. It's not perfect yet, but this technique helps protect our hearts, lungs, and bodies from overexertion..."
Slowly, she lowered herself onto Ryuji, her unique breathing rhythm returning.
Mitsuri stared intently at Shinobu's massive, snow-white peaks, bouncing with every movement, trying to memorize the breathing pattern—until Ryuji's hands rudely interrupted.
He groped and kneaded Shinobu's softness, pinching the pink buds between his fingers, letting the rest sway freely with each of her breaths. The sheer variety of shapes her chest took was mesmerizing.
Mitsuri instinctively clutched her own breasts. She knew they were eye-catching—most men only talked to her because of them. Even her friendship with Shinobu wasn't just because they were both Hashira, but also because... well, they shared this particular trait.
Watching Shinobu's chest being manhandled, Mitsuri felt an odd tingling in her own, as if invisible hands were teasing her. A growing warmth pooled between her thighs.
Shinobu arched her back, even cupping her breasts to give Ryuji better access—and without thinking, Mitsuri mimicked the motion, hefting her own through her uniform.
Her ample flesh trembled in her palms—was it from her quickening breath, or the excitement coursing through her?
Then, Ryuji squeezed Shinobu hard enough to nearly topple her forward—and the look on Shinobu's face, caught between discomfort and bliss, sent a jolt through Mitsuri.
Her fingers twitched.
Before she knew it, she'd pinched her own nipple through the fabric.
The sensation—amplified beyond reason—made her body jerk violently.
And then—
"Ahn~!"
She slapped a hand over her mouth, horrified. If she started moaning like Shinobu, would Ryuji drag her into that same torment? That pleasure?
She didn't know what she wanted anymore. Part of her ached for it—another part recoiled in fear.
Her heartbeat pounded as Shinobu's movements grew sluggish, her waist now fully under Ryuji's control. He lifted and dropped her effortlessly, her chest jiggling wildly with each thrust—
"W-Will I... end up like that too?"
The thought flashed through Mitsuri's mind before she could stop it.
Before she could dwell on it further, Shinobu finally collapsed against Ryuji's chest, her breath ragged and uneven, completely drained of strength. As his length slid free from her soft, snow-white curves, a burst of fiery essence splashed across her back—some even landing perilously close to Mitsuri herself.
Mitsuri watched with a mix of awe and trepidation as Ryuji gently repositioned Shinobu. Just as she was about to retreat—her entire body tingling with unfamiliar tension—she froze.
Shinobu, even in her exhausted state, had caught Ryuji's wrist. Slowly, deliberately, she guided his fingers to her lips... and tasted what Mitsuri knew couldn't possibly be pleasant.
Yet as she watched Shinobu's focused expression, something stirred in Mitsuri's hazy mind. Her eyes dropped to the glistening traces on her own hands, then to the spilled evidence before her.
Driven by hormones and sheer curiosity, she extended a trembling finger, dabbed it lightly against the strange fluid... and brought it to her tongue.
Verdict: Not tasty at all!
But...
For some inexplicable reason, she wanted to try again.
Her gaze drifted between Ryuji's broad back and Shinobu's devoted ministrations, her thoughts spiraling into dangerous territory.
Of course, Ryuji made no move toward her. He understood Shinobu's game—this desperate performance was for Mitsuri's benefit, a way to grant her friend options after her own abrupt surrender.
Not that her reasons weren't valid, he mused, idly stroking Shinobu's hair as she worked.
But she's still wrestling with guilt.
Although Shinobu's sense of restraint and guilt would normally be admirable, the fact that it only made her more charming and obedient was something Ryuji enjoyed far too much to correct.
Still, business before pleasure.
Ryuji hadn't forgotten his true purpose for coming to this world:
To smash girls—
Wait, no.
To save the world and recover the 7 Days to Die World Fragments.
He genuinely wanted to know what kind of ability the system would grant him for reclaiming this world's fragment.
Surely the system wouldn't just let him work for free, right?
So, at the crack of… well, not dawn, more like late morning, Ryuji emerged from his room, flanked by a clearly sleep-deprived Mitsuri and a not-so-sleepy Shinobu—whose bright mood betrayed how little rest she actually got.
Waiting for them at the entrance was Mai, arms crossed, packed and ready with weapons and scrolls. She glanced up from her parchment and deadpanned:
"Good morning."
"Morning!" Ryuji replied cheerfully.
"Morning, my ass! You perverted bastard! Do you have any idea what time it is?! We were supposed to leave at SIX! It's ELEVEN now! Are you planning to eat lunch before we leave? Or take a damn nap after lunch too?!"
After spending an entire night listening to moaning sounds from the next room, Mai was absolutely fuming. She'd tried reminding them at 6 AM—only to hear Shinobu still "nnnnn~ ahhhh~"-ing softly through the walls. Tengen's wives, having realized what was going on, had tactically evacuated the area early on.
"Actually, that sounds like a great idea." Ryuji nodded seriously.
He hadn't slept enough. Mitsuri looked like she hadn't slept at all. And even Shinobu, though composed, clearly needed rest.
"That's not the point!"
Mai kicked at him in a anger, but ultimately…
They all ended up eating lunch and taking a nap anyway.
No wild antics this time—Ryuji simply lay down on a sun-drenched rooftop with Mitsuri and Shinobu nestled in his arms. At worst, he gently squeezed Shinobu's chest and played with her strawberry-colored nipples—a minor indulgence, if you asked him.
Shinobu blushed furiously, but since they'd be abstaining for the next two days, she allowed the mischief.
Yes, two full days.
The Demon Slayer HQ wasn't close, and there was no train access. They'd have to ride horses the whole way.
And Ryuji? He wasn't a fan of outdoor sex. Not without a solid bath, clean bed, and at least three bottles of water.
Although Mai had voiced her displeasure earlier, she didn't argue further. After all, Ryuji showed no fear about traveling at night. In the end, she simply leaned against a large tree above him, resting and regaining some of her strength.
The journey that followed…
"So boring…"
Ryuji let out a sigh, earbuds in as he listened to English vocabulary play on repeat. The road was dull and uneventful. In this era, the scenery wasn't exactly worth admiring, and although they were traveling through remote areas, there weren't even any demons or monsters to keep things interesting.
It was as if, ever since he killed that female demon, the entire region had suddenly become a barren wasteland for monsters—vanishing overnight without a trace.
They even encountered several farmers who had taken refuge in the forest. After giving the party some directions to the nearest settlement, the farmers also shared something else.
"Ever since you defeated that female demon, the monsters in this region really have disappeared," one of them had said.
Shinobu's face lit up with joy. If all went smoothly, it meant they only had to take down the remaining two.
Ryuji didn't doubt it either.
After all, if this mission were truly impossible for him to complete, the system probably would have summoned Rias instead of Mai.
…Although, now that he thought about it more carefully, the 7 Days to Die world fragment and its recruitment mechanics really were sketchy enough to make him second-guess everything.
"Well, whatever. I'll just kill those two bastards and be done with it."
He clenched his fist. Sure, the buffs granted in this world would disappear once he left this world, but thanks to his time here, he had already grown far more powerful than before entering this world.
His control over Thunderflame and Water Manipulation techniques had matured, giving his combat abilities a massive boost—and that was on top of the unique buffs provided by this world.
Still, one question lingered in his mind—
"What about the original story?"
Ryuji frowned in thought. By now, Tanjiro Kamado should've made his appearance, right?
And what about that creature on Mount Natagumo? That strange fusion of demon and yokai had vanished without a trace. Even Daki, whom he'd already slain, hadn't shown any signs of fusing with yokai—on the contrary, she'd even tried to exploit humans to hide from them.
So then—
What exactly is the relationship between demons and yokai in this world?
Ryuji was genuinely curious.
And just as the question gnawed at him, he felt something stir within him—not an emotion, but a sensation far deeper.
A pull.
A sudden guidance.
He sharply turned his head and unleashed his Observation Haki. In that instant, its range expanded by several times, sweeping out across the landscape like a wave.
And then, he saw them.
A boy with a scar on his forehead…
And beside him, a girl with a bamboo muzzle over her mouth… and a small horn on her head.
The protagonist…
Had arrived.
~~~~~~~~~~
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