XXIII

(WARNING ⚠️⚠️:Manga spoilers. Smut.

Smut includes: • Slight degrading.• Edging • Belly bulge• Overstimulation)

***3rd POV***

Two Uppermoons gone, in a few months. How it was possible, baffled him. Uppermoons were an incomprehensible force, which he spent years forming with his very blood. The fact they were dropping like flies irked him.

It made his blood boil.

Muzan sat in his office, tinkering away in the miniature laboratory he had.

The podium was upside down, he preferred it that way, saying something about the information flowing faster to his brain. Well, the one he uses to think anyways.

The Yūjo lily laid in its pot, right beside him on the table where he had different mixtures and compounds bubbling up in their multicolored fashion.He plucked some of the leaves and started grinding them.

"Nakime. Help." He states and the sound of a biwa strums. A number of volumetric flasks appear beside him and he places the substance into them. He then glances at the biwa demon.

Nakime sat on the podium under him.

Her long, black hair was braided this time, resting on her shoulder. She had on a dark purple kimono this time, one that Muzan just knew who bought for her.Her small hands held the biwa in the normal fashion, as she sat respectfully, quiet.

Her bangs were pinned behind her ears, as the kanji for upper moon four shone through her pink colored eye. Her face was as usual, emotionless, but Muzan could sense something deep inside of her. He didn't even have to read her thoughts.

He looked at her for a while before sighing quietly, "Nakime..."

"Yes, Muzan-sama?" She answers, still looking forward, expression neutral.

His face scrunches just a bit, in worry, "Come up here...."

She still doesn't look at him, mindlessly strumming her biwa, making her appear on the podium where he was. She then respectfully sat on the floor, holding her biwa in its normal fashion.

He goes back to his expirement, notingquietly, "Do you want to talk?"

She stays silent for a while before looking at him, "I have nothing to speak about, to disturb you with, Muzan-sama."

He hums quietly and drips some of the lily's extracted water into a bubbling mixture,"I'd like to tell you something the other Uppermoons don't know about."

Nakime nods slowly, giving him her full attention. He looks at her and gives another one of his rare smiles,"Due to you consuming my blood, I formed a link with all of you. Therefore, I can read your thoughts."

She blinked for a while, trying to register what he said. He smiled again, almost chuckling when her eye narrowed slightly.

"So, do you want to tell me what's wrong now?" He mutters, putting his hands in his pockets, "I think I'd like to hear it from you instead of probing around your thoughts."

She sighs and looks down, hesitating.

Yes, she needed to get this off her chest, but the one demon she always talked to was dead.

She gives a little nod before looking at him again. He walks to her and squats in front of her.

She takes in a deep breath and explains everything that happened, excluding the part about the demon slayers finding the house, or about Lady Yusa.(She knew he would get livid about that.)

Muzan listens attentively and she finally ends with a mutter, "How is Upper moon one?"

Muzan smirks at this, "Don't you mean, 'Koku'?"

Her eyes widen and she turns red, in embarrassment and disbelief.He chuckles, "Curiosity got the best of me and I wished to check on the both of you. That's when I heard you say ....that."

Nakime puffs her red cheeks, in even more embarrassment and he grins,"Kokushibou is fine. He's actually in the infinity castle right now."She never heard her heart beat so fast before.

She gulped a little as her hands clenched in excitement and anticipation.

Thank goodness he's okay.

"Would you like to see him?" Muzan asks, noticing her clenched fists. A small smile forms on her face and she slowly nods.

He smiles again and nods, "Alright. Go on then."Her eyes widened, not expecting him to agree with her.

"He arrived in the castle a few days ago."

She nodded slowly, looking down when she realized he didn't even go back to the house first, before coming to the Infinity Castle.

Muzan notices the way her shoulders dropped."He's in his quarters, on his training grounds as we speak."

She looks up at him and he smiles, nodding for her to go. She quickly strums her biwa, giving a particular melody, and she disappeared.

The strings of the biwa all represent a foundation in the infinity castle. For each room, a specific tune most be played, with a definite amount of struma.

After a few strums, she appears in the training grounds for Upper moon one.

It was all wooden plated, with golden lights like the rest of the castle. But it had intricate designs too, carving in his aesthetic.A few feet away from where she sat, there was a vast space of floor, elevated from the rest of the quarters.

With a blossoming hibiscus plant in the middle of the space, the rest of the space was free, for combat.A prime example upfront.

She blinked a bit when she saw lightning strikes all over the podium.

Those look like breathing styles.

Her eyes widened when she saw a completely new individual.Navy blue hair, lean, slightly muscular.With the kanji of 'six' in his blue eyes.

Her face went from surprise, to confusion, to irritation.

Who was the punk that took Gyutaro's and Daki's position?There was a growing scowl on her face, that is, until Kokushibou knocked him over, flat on the floor with a leg sweep.

Kaigaku fell to the floor with a grunt and sighed right after. Kokushibou stood up straight and looked down at him, making him immediately stand up in fear.

"Don't get so discouraged easily." He mutters, folding his arms, "Even with the potential of strength, it takes work to really be a part of the strongest."

Kaigaku nodded, sheathing his sword.He wiped the sweat on his forehead and exhaled, trying to calm down his heavy breathing.He then noticed the woman, sitting below them. He raised an eyebrow,"Who's she?"

Kokushibou gave him a confused look but peeked down. And his heart started racing again.

Nakime continued to watch the two of them speak, until kaigaku looked at her.

She scowled, extremely irritated.

"Bitch." She muttered, before blushing when Kokushibou looked down at her.Their eyes met and that spark rattled them from their core.It was like a magnet, even stronger than before now.

She forced herself to look away, from his bare chest. Although she'd seen it many times, something about seeing him training– body speckled with sweat, sliding down his collarbones and abdomen...

She sighed and took in a deep breath, trying to calm herself down. At least, not to scar the newbie.

Kaigaku, feeling all too curious about seeing a woman here, immediately jumped off the training ground, down to the podium where she sat.

Nakime flinched as he kneeled in front of her, observing her closely.Kokushibou watched, hands oddly close to his sword.

"I never expected a woman to be here." He mutters and she looks at him expressionless.

Her hands were itching to strum a tone that makes spikes stab out of the floor but stopped as he stretched out his hand,"I'm honored. My name's Kaigaku."

Nakime blinked, surprised when she didn't receive any misogynistic jabs.

She hesitated, but slowly shook his hand."Nakime."

He basically beams at her, "It's nice to meet you, Nakime. You're very beautiful."

Nakime's eyes widened again and Kokushibou immediately frowns, even scowling a bit.

She blinked again before smiling, "Oh... thank you..."

He grinned, "Don't mention it. Just stating facts."

Kokushibou resisted the urge to roll his eyes. Then they made eye contact again.

Longing. That's all he could see in her eyes.And he had the same thing going on in his head. Their bodies called out to each other.

Nakime, all of a sudden, had this.... desire....to infuriate him.

Kokushibou, that being. She wanted to see if he really did care.At least, that's what she told herself.

Truly, she just had a yearning to irk him, for leaving her all alone back at the entertainment district, without a word.

Kaigaku didn't look so irritating anymore.

"You're the new upper six, right?." She says, looking away from Kokushibou, to the demon in front of her.

Kaigaku nodded, rubbing the back of his neck sheepishly. She smiled and gently placed her hand on his neck, tracing the small gash there.

He let out a soft breath, closing his eyes.

She smiles again and murmurs, "Your wounds will heal faster with time."

He opens his eyes again and gives her a smile of gratitude. From the corner of her eye, she saw Kokushibou narrow his eyes, but he still didn't move.

So, she then whispered gently, "Would you like me to heal them for you?"

He immediately blushed, eyes widening at her tone.

Kokushibou, on the other hand, looked baffled. For the first time in four thousand years.What the hell did she think herself doing?

"O-oh..." Kaigaku stutters, before giving a shy smile, "I'd.... appreciate that."

Nakime grins again, "Wonderful."

"I'll....." She continues, her hand now going from his neck, to trailing down his bare chest, making him blush even more, "...be waiting."

He blinks for a while and gulps slowly, and she swore she felt him shiver in excitement.Sadly, the moment was cut short as kiss Kokushibou appeared right behind Nakime, making him look up at the demon.

"Those wounds will heal when you consume flesh. Leave."

Kaigaku flinched at the authority, and absolute intent to harm, in his tone.He quickly stood up, smiling at Nakime and waving too, before leaving Kokushibou's quarters.

The moment he had left out of the door, Kokushibou squatted, behind her.

Her breath hitched in her throat, from the heavy lascivious intent, coming from him."Seal the door."

She blinked and then glanced at him. He looked right back, a serious expression on his face,"Don't make me repeat myself, Nakime."

She quickly strummed, and the only door opening to his quarters sealed shut, disappearing into the wooden framework.The way he said her name, had her body responding without control.

She sat up straight,heart thumping in her chest as he stood up, walking in front of her. She wanted to look up at him but he pushed her head back down, with force.

"Don't think about it."

She gulped again, and her breath hitched when he took her biwa out of her hands and slid it away from them. He removed his hand from her hair, and for a second, she thought he'd let her go.

Until his hand returned and grabbed a fistful of her hair, tilting her head back.

She made a noise of surprise and whimpered softly, when he squatted in front of her again, having a tight grip on her locks."Did you really think that was worth it?."

She blinked, in pretense innocence, but yelped when he tugged on her hair again.

"Don't you dare play innocent with me now." He mutters lowly, sending shivers down her spine, "Answer me."

"What's wrong with me..." She whispered, "...trying to get your attention?"

She yelped again when his grip tightened on her hair."Oh? You wanted my attention, huh?." He hissed, yanking her flush against him, "Well, you've got it now."

She opened her mouth to protest but was silenced by a kiss. It was fierce, and heated, taking up all the air in her lungs.His tongue harshly invaded her mouth, as he nipped at her lower lip, making her whine into the kiss.

His hand held on to her hair tight, tilting her head the way he wanted as he deepened the kiss. She tried her best to return the kiss, but his pace was too deep, too sensual. Her hands flew up to lay on his shoulders but he quickly grabbed her wrists, holding them together, and pressing them down to her laps.

With his knee, he pried open her legs.She gasped into the kiss as he slid his tongue down her throat, trying to break her hands free. She wanted to hold him, but when he pressed his knee against her clothed heat, all sense of reasoning flew away.

She tried pulling away from the kiss, but he yanked her closer again, and forced her down to the floor, trapping her between it and him. The kiss was broken, and she panted heavily, resting her head on the wooden floor. His knee returned, pressing against her heat, firmly."Koku...." She whined, looking up at him through lidded eyes.

He ignored the ache in his groin, pinning her hands above her head. His other hand gently cupped her cheeks, making her keep eye contact.She looked breathless. Her eye drooping already....when he was barely done with her.

"Mouth open."

She shivered, making him smirk. He pressed his knee against her again, and she whimpered, "If I repeat myself, you will not like it at all."

She immediately opened her mouth, sticking out her tongue too, just to get to him.He stuck his fingers in her mouth, "Suck."

She obediently sucked on his fingers, coating them thick with her saliva. Her eye widened again when he placed her legs on his shoulders, hiking her yukata up.

"Sssh. Continue." He orders, and she whimpered but took in his fingers deeper, meekly sucking on them. He groaned quietly, at the lewd sight.He then took off her laced panties, wiggling them down to her ankles before peeling them off.

Nakime gasped again, gripping onto his wrists as she tried to hold down her moans with his fingers. He pressed his finger on her tongue and she groaned herself.She reluctantly let go of his fingers, as he pulled them out. She then looked up at him, panting a bit, with her cheeks flushed.

He pulled her closer, and then circles one of the coated fingers between her ass cheeks. Her eye widened even more and she immediately whined when he shoved it inside. Her fingers dug into her palm, trying to hold herself from latching onto him.

He moved slowly, humming lowly at how she was gripping onto his finger."So tight. Makes me wonder how far it can stretch."

She whined again, at the statement and jerked a bit when he added two more fingers in there. Her eye rolled back when he started massaging them in her, at a slow pace. Soft pants left her lips, as she struggled to keep her eyes open.

"Would you look at that? What's wrong? Will you cum just from my fingers? Don't be pathetic, Nakime." He mutters in an amused tone, chuckling at how her eye rolled back even more.

Oh, she likes that? Noted.

He slid his fingers out of her, making her whine again. He shushed her, his other hand moving up to her torso. He fully hiked the dress all the way, taking it off her body completely.

His eyes roamed her body, taking in the all too familiar sight that never failed to make his mind race. His eyes darkened at her pert nipples and he smiles, pushing down the urge to bite them.

Nakime cries out, at the sharp sting on her chest. She then whimpered, when his long fingers rubbed on her nipples, where he hit.

"Such a little attention whore." He says with a small laugh as she whimpers at him. He lands another smack on her nipples and she moans out, eyes rolling back again,"A little pain whore too, I see."

"Koku, please.." She cries again, feeling her pussy clench against nothing. It was agonizing.

He grins, "Tsk tsk. Begging already? I think I should let you cum..."

She smiles when she heard that, but cried out again when he leans down and bites her nipple roughly, "But I won't."She groans in frustration and starts moving up and down, on his knee, trying to get some–any, type of friction.

He grins wider, quite unlike him but she was too busy, trying to chase her growing orgasm.He let her rub on his knee, watching her desperately hump him, chasing her release.She could feel that coil in the pit of her tummy, and she moved up and down faster, mewling quietly. Her moves were with fervor and she whined, eye shutting in pleasure as she felt it rush to her.

Just as she was about to release, he yanks her off his knee.

Her eye flew open in shock and frustration, panting and whining at the same time.

He smirks and then pinches her nipple roughly making her gasp, "Who said you could cum yet?"She almost lets out a sob, her eye watery. Her pussy throbbed, already sopping the floor beneath them with her juices. He leaned down again, biting her neck harshly, leaving a very visible mark.

"Koku..." She managed to croak out, as he continued to make marks all over her neck and chest, "I'm...sorry..."He chuckles quietly, and kisses the back of her ear, "What're you apologizing for?."

She whined again when his fingers grazed her clit.

"For....for...." She muttered, trying her best to keep a steady tone as he littered soft kisses on her neck, "For getting all close....with ... Kaigaku."

He hums quietly, roughly pinching her nipple again. She gasps loudly and clutched at his back, holding him closer,"And I'm sorry....for not sitting down...and talking with you."

Kokushibou's eyes widened when she said that. He almost wished she hadn't said that.

He wanted to push her away, she made him weak. Made him feel things he should've never felt before.

"I'm sorry." She whispered again, nuzzling into his hair.

Kokushibou's heart rate picked up, as his breathing slowed. He held her closer, gently wrapping his arms around her waist, allowing her to wrap her arms around him, and kiss the top of his head as much as she wanted.

Pull away. Pull away now!

His mind screamed at him, but he paid no mind to it. Slowly lifting his head up and kissing her gently.

She gasped softly and her fingers ran through his hair, as they both got lost in the kiss. Their tongues rubbed against each other, causing light smacks to echo in the large space. Her eye fluttered shut, as the kiss grew heated again.

She groaned again, pulling away slightly when he slid three fingers into her soaking pussy.

"Oh fuck. You're so wet for me." He whispered, pecking her lips before sitting back up. He grabbed her hips, tilting her up towards him and bending her legs back a bit. The sight of her so delirious and needy drove him hungry with desire.

Nakime continued to moan and whine, as his calloused fingers drove deep into her with the new positions. Her eye rolled back again and she screamed, when he grazed that special bundle of nerves. Her body racked with pleasure when he grazes the spot over and over, driving her insane.

"Nn...,Koku..p-please.." She cried, nails digging into his back. He smiles wider, leaning closer to her ear and biting the lobe.

"Cum."

Her body did just that, and she cried out loud, as her orgasm hit her like a building.She panted heavily, eye closed as her body stilled before slowly relaxing, a content smile on her face.

That is, until she felt his length press up directly against her heat.

She whined and opened her eye, seeing him smirk at her."You think this is over?" He questions and she whimpers.

He chuckles again, "I'm going to have to imprint something into you. And for that, I need you fucked dumb."

Despite her body feeling tired, her pussy clenched at the thought and he felt it.

"Oh, you dirty little minx." He mutters, before tilting her backwards again and shoving his whole length inside her.She let out a shout and her hands circled around his neck, trying to keep herself steady. He grunted, begging his pace slow and steady.

Every drag, had her mewling and panting.

"There we go." He whispered, watching her eye prickle with tears, "Haven't even started and you're already crying. Are you that sensitive..?"

She sobs this time, when he purposefully grazes against her spot, going so slow.

Why the hell was he teasing??

"Ssh, ssh." He shushed her, taking a hand up to wipe her tears. While he does that, he snaps his hips back and forth, at that specific pace she craved. Just for a second.

Her body jerked up from the impact, but she whined when he went back to slow drags."Kokuuu.." She cries out again, looking at him with teary, pleading eyes.

He smiled and tucked a strand of hair behind her ear, "Yes. I'm here."

"Faster.." She muttered, grinding down on him. He immediately held onto her hips, glaring.

"You want me to make you feel good?..after you've been bad?." He says, tilting his head and still going slow, "I don't think I should. And if you even try moving those pretty hips of yours, I can leave you right. here."

She whines again, "Please..."

He smirks, "If you're going to beg, at least be more convincing."

She gulped again and gave a shaky breath, "Koku...please. please, please fuck me. Fuck me senseless..."

His eyes darkened at that,but he continued his slow strokes. She sniffled in frustration,  groaning when he grazed her spot again.

"Please... please..." She utters, voice hoarse and quiet, "Fuck me."

Her eye went as wide as saucers as he pulled out and plunged back in her. Hard.

She hissed loudly, as his pace went from slow and teasing, to quick, and brutal. The slapping of skin could be heard all over the training grounds, as well as screams and low groans. Nakime clawed at his back, toes curling as she felt herself being stretched open, more than she could imagine.

"K-ko...K-fuck.. don't..I..." She babbled, as drool dipped down the side of her mouth.

Kokushibou chuckled, placing soft kisses all over her face and neck as he continued to manhandle her at the same time.Nakime felt like she was floating.

Her eye was all the way back, and her legs quivered as she was fucked stupid. Her mouth was slightly open, and she gave out moans and yelps, which she could even hear because her ears rung.

She gasped again when he took her hand and pressed it down on her stomach,"Kami-sama..do you feel that?" He whispered, groaning as well as he tried to keep his composure.

She managed to focus on her stomach as she felt something sticking out repeatedly. She clenched on him again and he groaned, as they both took in the sight of the bulge in her stomach, from him being so deep.

"F-f...fu...oh g-gosh, wh- ah!..."

Kokushibou smiled in between groans, content with the way her eye was hazy and her tongue slightly lolled out of her mouth. She was fully consumed by him.

And only him.

"You're taking me so well." He praises, leaning down and gently sucking on her nipple, a good contrast to the back-breaking pace he was moving at.

This seemed to bring her back into it as she whispered in his ear, "C-cum... cumming..."

He grins when she says that and pulls out of her again. She sobs at the lost contact but screams again, when he plunges back in.

"Go ahead. Cum for me." He mutters and she gasps, holding him tight.With more sharp strokes, she bit down on his shoulder, coming hard. She squirted out, as it got all over his abdomen and her thighs too. He groans as her walls squeeze him so tightly. So he buried his face in her neck, increasing his pace.

She sobbed louder in his ear, "K-koku...t-too... too..much..."

He hissed in her ear as she squeezed him tighter, "I know baby. Give me one more. Come on, give me more of that sweet nectar."

She cried louder, throwing her head back as she felt her spot being abused. Her body screamed in fatigue, ready to collapse at any point, yet her pussy throbbed again. She met his thrusts weakly, moaning hoarsely in his ears.

With a grunt and a tight grip around her hips, he came, flooding her insides.

She let her tears fall, as she yelped, cumming again. Their fluids mixed together,  as they both tried to catch their breaths.

Well, Kokushibou did. Nakime was fast asleep. He smiled at this, sitting up and gently kissing her forehead. He carefully lifted her up, picking all her clothes as well, and keeping her biwa safely behind the hibiscus plant.

He walked out of the training grounds, and into his room, sliding the door open and going inside. The well-kept room was silent, purple painted walls adding to the calm.

He softly wiped her up first before placing her on his bed, draping her in another one of his haori. He smiled, as she slept peacefully, wrapped up in his sheets.

He then frowned, when he felt a call to the main meeting room. His tingles told him it was Muzan. He wasn't asking for Nakime... surprisingly.

He sighed and quickly put on his haori and hakama, smiling at her sleeping figure one more time before walking out of the room and shutting it.

**~**~***~**~**~**~**~**~**~****

Muzan Kibutsuji would go on to the demon slayer head quarters himself that night, to see Ubuyashiki Kagaya, regarding the Yūjo lily.

Which didn't give him the ability to walk under sunlight

**~**~***~~~****~~~~~*****'~