07 The Life-or-Death Proposal

Yuu and Yurika had headed out into the city to have dinner.

They felt like if they’d stayed in that room alone any longer, their emotions would have overflowed and things would have gotten crazy.

“Hehe, Yuu-kun ♥”

Perhaps to hide her shyness, Yurika poked Yuu in the side with her elbow.

“It’s so cute that you suddenly wanted to go on a date with Onee-chan.”

“It’s not a date. We just came out for dinner.”

“Geez, you’re so dishonest~!”

Yurika casually took Yuu’s hand and interlaced her fingers with his. It was a "lovers' grasp."

With the lingering sensation of the kiss still fresh, Yuu couldn't keep his heart from pounding under Yurika’s affectionate assault.

(Ugh, Onee-chan. You have no idea what you’re doing to me. Doing all these defenseless, couple-like things... You don't even know how much I love you...)

With the lingering sensation of the kiss still fresh, Yurika couldn't keep her heart from pounding as she launched her affectionate assault.

(Haaah ♥ Yuu-kun, you have no idea what you’re doing to meee. I can’t stop my heart from racing ♥ He doesn't even know how much I love him...)

They really were two peas in a pod.

“Hey!”

After walking for a while, a familiar voice called out from behind them.

“Wait, is that Yurika?”

Yuu turned around to see one of his sister’s friends standing there.

She was a stylish, sophisticated college student dressed in the latest fashion. It was Kashiwagi Maki, a friend of Yurika’s since high school.

“Maki.”

“What a crazy coincidence! Oh, hey, Little Brother. Long time no see.”

After a quick wave to Yurika, Maki turned to greet Yuu.

“Kashiwagi-san, it’s been a while.”

“Oh? You’ve gotten taller since the last time I saw you.”

When Yuu greeted her, Maki’s energy shifted, and her face flushed slightly.

“Hmm... lick.”

Maki stared at Yuu, licking her lips with a mischievous look on her face.

“Hey, Little Brother. Try calling me 'Maki-neechan.'”

“Huh? Maki-neechan...?”

“Kyaaaaah ♥ Little Brotheeeeer! Gah!”

As Maki tried to pounce on Yuu for a hug, Yurika’s hand clamped onto her face, stopping her dead. It was like a professional wrestling "Iron Claw."

She never seemed to land her moves during their pro-wrestling play, but she looked like a total pro while doing it to Maki.

“Ow, ow, ow! It was a joke! A joke!”

“Maki, you’re always trying to sneak in when I’m not looking. Yuu-kun is mi-i-ine!”

“Give! Give! I give!”

Yurika was dead serious as she held Maki back with one hand. Where was she hiding that kind of strength?

“O-Onee-chan... are you really still doing stuff like that?”

Yuu looked at her as if he’d just witnessed his sister doing something incredibly cringe-worthy.

He wondered how their friendship had even lasted this long.

“N-No! It’s not like that. I only did it because Yuu-kun was in trouble.”

Yurika tried to make an excuse, but it had zero credibility.

“Anyway, Maki, aren't you dating that senior?”

“Ah... that’s over. He was way too pushy and only cared about sex.”

Yuu’s face turned red and he froze at the graphic "girl talk" from an older woman.

“I think younger guys are the way to go after all. They’re cute, and I can make them do whatever I want.”

Maki said this while glancing repeatedly at Yuu.

“Ma—ki—iiiii!”

Yurika’s intimidating aura flared up again.

“I said it’s a joke! Yurika, your face is scary!”

“Any invasion of Yuu-kun’s territory results in immediate military action according to the 『Sister Security Treaty』!”

“I told you, you’re scary! What even is that? It sounds like a national security treaty. Seriously, your brother-complex is as wild as ever.”

Deciding that Maki was in actual danger, Yuu stepped in between the two to stop them.

“Kashiwagi-san, thank you for continuing to be friends with my weird sister.”

“Little Brother, you really are such a good kid. It’s fine, I know she’s just kidding. Besides, it’s fun to tease Yurika.”

“Yeah... I kind of get that feeling too.”

For a brief moment, Yuu and Maki shared a mutual understanding.

After parting ways with Maki, the two continued walking through the city as the streetlights began to flicker on in the dusk.

It seemed Maki had set Yurika’s possessiveness on fire, as she was clinging to Yuu even more than before.

She had her arm linked with his as if she were embracing him, her fingers tightly interlaced in a lovers' grasp. It was a clear declaration that she wasn't letting him go to anyone.

“Onee-chan... it’s hard to walk...”

“Well, if I leave you alone, some other woman might snatch you away, Yuu-kun.”

“What are you even talking about? Are you a toddler?”

From behind, they looked less like siblings and more like a passionate couple.

Their intense flirting drew envious stares from passersby, who looked on thinking, I wish I was with a beauty like that. Like a real pair of lovers, they walked into a restaurant huddled close together.

◆ ◇ ◆

After finishing their meal, the two walked through the nighttime streets hand-in-hand.

“Ahh, that was delicious! Food just tastes better when I’m with you, Yuu-kun.”

“The food is the same regardless of who you’re with.”

“Geez, it really is better!”

Despite Yurika’s insistence, Yuu gave her a blunt response.

Inside, however, he wanted to say, Any food I eat with my favorite sister is the best thing in the world! He just couldn't bring himself to say something so embarrassing.

As Yuu passed by a bookstore, a poster for a new release caught his eye.

“Oh, the latest volume is coming out.”

While he was distracted by the poster, an ominous voice drifted from behind him.

“Woooah, you’re super cute! Want to go hang out somewhere?”

“We know a great place. Come on, let’s go!”

“Excuse me? No! Go away!”

Yuu spun around to see a pair of flashy "namba" guys trying to lead Yurika away.

Yurika was beautiful, cute, and had a great figure, after all. Walking through the city, she was bound to attract flashy guys and pick-up artists.

(Dammit! What do you think you’re doing to my precious sister?!)

Yuu stepped in front of the men, shielding Yurika.

“Hey, stop that!”

“Who’s this brat? What do you want?!”

“Get lost! You’re in the way!”

The men barked at Yuu for interfering. The moment he heard those words, a bitter memory resurfaced in Yuu’s mind.

It was back when he was much younger—

When he’d gone to pick up his sister after she’d been cornered by older students at a college welcome party, the college guys had treated him like a mere child.

To the eyes of adults, Yuu wasn't a man who stood on equal ground with Yurika; he was just a little brother.

(D-Dammit!)

Yuu squeezed his arms tight.

(I have to protect Onee-chan! I can't keep being treated like a 'little brother' forever! I'm not that kid anymore! I’m going to be the Knight who protects the woman I love!)

Yuu resolved to transform from a "little brother" into a "Knight" defending his "Princess."

His feelings were so strong he was liable to spin his wheels, but he was determined to stand up for his beloved sister.

Neither Yuu nor Yurika knew it yet, but their long day was about to become even longer and more shocking from here on out.

Yuu glared at the pick-up artists.

One was a beefy, thuggish type, and the other was a flashy "normie" type. Yuu was clearly at a disadvantage.

In this classic "love comedy" setup, Yuu’s heart raced with the sole desire to protect his sister.

“I... I have to protect Onee-chan!”

Yuu took a step forward.

“Hey, what the hell is your problem?!”

“We talked to her first! If you’ve got nothing to do with this, back off!”

The men shouted aggressively, trying to intimidate him.

Seeing that their opponent was just a kid, they were likely trying to look tough so they wouldn't be looked down upon.

“I... I am...”

But Yuu didn't back down. Instead, he shouted at the top of his lungs.

“I am the 《Holy Yurika Knights Commander! Yuu Eternal Brightstone》!”

...Silence.

The pick-up artists flinched at Yuu’s full-blown "chuunibyou" outburst.

He wasn't joking; Yuu was being completely serious.

However, realizing the awkward atmosphere, Yuu figured he’d made a mistake and tried again from the top.

“I’m... I’m Yurika’s boyfriend! Stay away from my woman!”

Boyfriend—

—friend—

Yurika was even more shocked by Yuu’s sudden "boyfriend declaration" than the men were.

(Wha—wha—wha—whaaaaaa?! Yu-Yu-Yuu-kun! Yuu-kun said he’s my boyfriend ♥)

Yurika’s face drifted into an expression of pure ecstasy. Meanwhile, Yuu charged at the men.

“Uwoooooh!!”

“Wha—what’s wrong with this kid?!”

“Dammit, get off me!”

Yuu lunged into a desperate tackle, clinging to the two beefy men.

The pick-up artists were actually a bit taken aback by this anime-style development.

But Yuu was deadly serious.

“Hurry! Run while you can!”

“Wh-Whaaa?! I can’t leave you and run away, Yuu-kun!”

“I... I’ll protect Yurika even if it kills me!”

“Yuu-kuuuuuun!”

Being left behind by the two of them as they retreated into their own world, the men’s will to fight evaporated.

“Okay, okay! We get it, just let go!”

“What a freakin' crazy couple!”

In the scuffle, a man’s elbow accidentally caught Yuu in the face.

Thwack!

“Gah! Ow!”

“Let’s just go!”

“You guys have fun with your weird drama!”

Terrified by the "psycho couple," the pick-up artists fled. It was a victory for the 《Holy Yurika Knights Commander! Yuu Eternal Brightstone》 (lol).

The two of them were left alone on the sidewalk────

Regaining his composure, Yuu suddenly remembered the problematic things he’d said in the heat of the moment.

(Oh god, oh god, oh god! I totally got carried away and blurted out all kinds of crazy stuff... calling myself her boyfriend... calling her 'my woman'... and I even dropped the honorific and called her 'Yurika'!)

In contrast to Yuu’s internal panic, Yurika’s eyes were moist with emotion.

“Yuu-kun... are you okay?” she asked, a worried expression on her face as she leaned in to peer at him. “Oh no, you’re hurt!”

During the scuffle, the man’s elbow had caught Yuu in the face, splitting his lip and causing a trickle of blood.

“It’s fine, really. Just a scratch.”

“Those bastards... hurting my Yuu-kun... Right, that’s it. I’m gonna kill ’em!”

A flicker of madness danced in Yurika’s eyes. It seemed the Onee-chan was far more dangerous than any pick-up artist.

“Whoa, hey! It’s okay! It was just an accident!” Yuu shouted, desperately trying to restrain her. To keep her from spiraling out of control, he took her hand, hoping to settle her down.

Thump-thump, thump-thump, thump-thump────

His mind had settled, but his heart rate was only accelerating.

“Yuu-kun... thank you...”

“It’s nothing, Onee-chan. I’d do anything for you.”

Seeing Yuu’s noble struggle to protect her, Yurika’s heart pounded so hard it felt like it was about to overheat. Yuu was trying his best to become a "Knight," but in Yurika’s heart, he had long since been her Knight—her man of destiny.

“Yuu-kun, earlier... you called me 『Yurika』.”

Twitch!

“And you said you were my boyfriend...”

Twitch-twitch!

“And you called me 『your woman』...”

“Waaaaah! I’m sorry! I’m so sorry!”

Yurika’s face flushed a deep crimson, and a smug, lewd grin spread across her lips.

“So, Onee-chan is Yuu-kun’s girlfriend now, huh?”

“I-It was just a figure of speech! A split-second decision to handle the situation!”

“Geez, I guess it can’t be helped since I’m Yuu-kun’s girlfriend ♥ I won’t even be able to complain when you start doing all kinds of erotic things to me ♥”

“That’s not it!”

She was such a troublesome sister—claiming to ban eroticism when she was being cornered, but turning into a total pervert the moment she was on the offensive.

“Ugh, come on, let’s just go home.”

“Wait for me, Yuu-kun~!”

The distance between them had shrunk even further. They were more lovey-dovey now than when they’d set out, with Yurika clinging tightly to his arm.

“Hey, it’ll be bad if someone we know sees us like this.”

“It’s fine~. We’ll just tell them we’re really close siblings.”

“That is not fine!”

Yuu could only pray they wouldn't run into anyone they knew. Vigilant of his surroundings, he hurried home with his sister, who seemed determined to stick to him like glue.

◆ ◇ ◆

Ring-ring-ring-ring— Ring-ring-ring-ring—

The moment they opened the front door, the telephone in the living room was blaring. The electronic ring resonated through the house like a premonition, making their chests tighten with anxiety.

Yurika rushed inside and snatched up the receiver.

“Hello, this is the Akashi residence.”

Yurika’s face instantly went pale, her expression turning deadly serious as she responded.

“Yes, that’s correct. What?! N-No... I see... yes...”

As she hung up the phone, Yurika stood frozen, staring blankly into space. The smile she’d worn moments ago had vanished completely, and her eyes seemed to lose their focus.

“Onee-chan... what happened?”

When Yuu called out to her with a worried voice, Yurika’s lips trembled as she spoke.

“It’s... um... Mom and Dad... the tour bus was in an accident... the police called...”

“What?! Y-You’re kidding... No way... They were smiling so much when they left this morning...”

Yuu grabbed the TV remote.

“Wait! The news! Maybe there’s something on!”

The evening news had just started, and they were breaking the first report of the accident.

『Earlier today, shortly after 5:00 PM, a large tour bus carrying thirty-seven passengers headed for a hot spring resort crashed through a guardrail and plunged into a ravine in a mountainous area of XX Prefecture. According to the police, search and rescue teams are currently on-site, and the full extent of the casualties is not yet known.』

The footage played out like a scene from a movie. Yuu felt a sense of unreality, as if the ground had been pulled out from under him.

“Yuu-kun... what do we do...?”

Yurika looked at Yuu, her face on the verge of tears.

“Onee-chan. I-I’m sure they’re okay. They’re searching right now. I bet... I bet tomorrow they’ll both come home like nothing happened.”

Yuu pulled Yurika into his arms. His usually cheerful and "strongest" sister looked so small and fragile, trembling in his embrace.

“Sob... Yuu-kun... Waaaaaaaah!”

“Onee-chan...”

“Hic... sniff... If Mom and Dad are gone... what am I supposed to do...?”

(Onee-chan... she was having so much fun just a moment ago... and now she’s so weak, like she’s about to break... It’s not a given that they’re dead yet... but... if...)

Watching Yurika cry so helplessly, a powerful, immovable resolve solidified in Yuu’s heart. It welled up within him, growing until it was impossible to contain.

Grab!

Yuu pulled Yurika into a crushing embrace.

“Onee-chan! I... I promise I will protect you no matter what!”

“Y-Yuu-kun...”

Yurika’s eyes wavered with heat.

“Even if we’re the only two people left in the world, I will never stop protecting you! I’ll stay by your side and guard you forever! I’ll make you happy, I swear it! Because I love you more than anything!!!!”

“Yuu-kun...”

He held her tighter and tighter, as if making a vow to never let her go. As if swearing an eternal love.

『Ah, we have an update!』

The frantic voice of the news anchor snapped the two of them back to reality from their frozen moment in time.

『We’ve just received a follow-up report. Regarding the tour bus that fell down the cliff, we have information that all passengers and crew members are safe. It appears the bus was caught by trees partway down the cliff, preventing it from falling to the bottom. While there are some minor injuries, everyone has survived.』

““........................””

The TV cut to a reporter on the scene, who began relaying the details of the rescue. Yuu and Yurika remained in each other’s arms, staring silently at the screen.

『Could we have a word?』 the reporter asked, shoving a microphone toward a rescued passenger.

『Man, it was a shock. Suddenly there was a crash and we were rattling down the ravine.』

『I’m just so glad we’re safe. We couldn't very well die and leave our kids behind.』

Their faces were obscured, but the voices of the couple being interviewed were unmistakably those of Mikiya and Emiko.

““........................””

Yuu pulled back, scratching his head awkwardly as he spoke.

“Uh... th-that’s a relief. See? I told you they’d be okay.”

“Y-Yuu-kun... that’s wonderful. Ehehe...”

The two of them clapped their hands together in celebration.

“Oh, right. I just remembered. I have homework to do.”

“Right, right, I have an assignment too...”

The two of them, suddenly acting very restless, hurried off to their respective rooms.

◆ ◇ ◆

Slam!

The moment Yuu entered his room, he clutched his head as the memory of his recent outburst flooded back.

(Waaaaaaaaaaaaaaaaaaaah! What the hell was I saying?! That was a total confession! Wait, was it even a confession? Wasn't that basically a marriage proposal?! I’ve done it now!)

He writhed and squirmed on top of his bed. He felt like he’d fully opened a forbidden, immoral door that he could never turn back from.

◆ ◇ ◆

Slam!

The moment Yurika entered her room, she clutched her head as the memory of his recent outburst flooded back.

(Kyaaaaaaaaaaaaaaaaaaaaah! Yuu-kun, what are you saying?! That was totally a confession, right? Wait, was it even a confession? Wasn't that basically a marriage proposal?! What do I doooo?!)

She writhed and squirmed on top of her bed. The immoral, forbidden door she had no intention of turning back from was now wide open, and she felt like she’d already stepped far beyond it.

◆ ◇ ◆

Their hearts and bodies were boiling with heat and excitement, a surge of impulse that could no longer be stopped or reversed.

Yuu was feeling a sense of danger about taking a bath, while Yurika was plotting something indecent in that very same bath. A grand battle was about to begin.

Yuu walked down the silent hallway, treading softly so as not to make a sound. He crept down the stairs and headed for the bathroom.

They’d managed to get in touch with their parents afterward and confirm their safety. Though they’d celebrated together, they hadn't been able to look each other in the eye out of pure embarrassment. Since then, they’d been holed up in their rooms, writhing in agony.

And now, Yuu was trying to sneak into the bath.

(Phew... I’m so embarrassed I can't even look Onee-chan in the face. What am I supposed to do tomorrow...?)

He’d only meant to encourage her when she was crying with anxiety, but he’d gotten carried away and proposed to her. He’d sworn not to confess until he could take responsibility, yet thanks to an unexpected accident, he’d managed to confess and propose at the same time.

Currently, Yuu felt far too awkward to face Yurika.

『I’ll stay by your side and guard you forever!』

『I’ll make you happy, I swear it!』

『Because I love you more than anything!!!!』

Just remembering it made his face burn.

(Aaaah! I already told her I love her... well, I do love her. I mean, I love her too much! I love her so much it’s driving me crazy!)

He reached the bathroom without making a sound and put his hand on the door to the changing room.

“Eek!”

“Whoa!”

As he gently opened the door, his beloved sister was standing right there. They both cried out in surprise.

“Wha— Onee-chan?”

“Yu-Yu-Yuu-kun?”

Fwoooosh────

Both of them turned beet-red with embarrassment.

Yuu’s mind vividly recalled the proposal.

(O-Onee-chan... this is bad, I’m remembering everything. I told her I loved her. Wait, I haven't heard an answer, have I? What if it’s just one-sided? Waaaaah! I need to know!)

Yurika’s mind vividly recalled the proposal.

(Yuu-kun... mmm ♥ I’m remembering it too ♥ He said he loved me ♥ He definitely said it ♥ So it wasn't just my one-sided feelings. Does this mean I don’t have to hold back anymore? Waaaaah! What should I dooo!)

The two of them, stealing glances at each other, spoke at the exact same time.

“Onee-chan.”

“Yuu-kun.”

“Uh...”

“Oh, Y-Yuu-kun, you go first.”

“Well, O-Onee-chan, what are you doing here?”

“Oh, um, I was just thinking of taking a bath.”

They were both thinking the exact same thing. Too embarrassed to face each other, they’d both tried to sneak in for a bath.

“Well, you go ahead, Onee-chan.”

“No, no, you go first, Yuu-kun. I have some laundry to do.”

Yurika pointed to the nurse costume she’d worn for their "play" earlier. It was true that if she left it there and their parents found it, it would look very suspicious.

Yuu’s plan, should his mother ever find the costume, was to tell her with a look of pity, “Onee-chan’s hobby is secretly cosplaying alone in her room, so let's just keep it our little secret.”

“Um, you really should go first.”

“No, no, you take the bath first.”

“........................”

Yuu was on guard. He was worried that if he went in first, his excited, perverted sister would barge in.

...Then again, there was a high probability she’d barge in even if he went in second, so it didn't really matter.

“Hahaha...”

“Ehehe...”

(No, surely not... no matter how perverted she is, she wouldn't actually barge in on me now that I’m not a kid anymore... right?)

Yuu didn't realize it. Yurika was exactly the kind of person who would do that "surely not."

“Well, I guess I’ll head in then.”

“Okay, I’ll head back to my room.”

Alone in the changing room, Yuu began to strip, trying not to pay too much attention to his sister’s underwear in the laundry basket.

The urge to "sniff-sniff" welled up again, but if Yurika caught him and called him the "worst ever," he’d never recover, so he restrained himself.

◆ ◇ ◆

Swoooooosh—

While Yuu was showering, he noticed a rattling sound coming from the changing room. Yurika must be doing the laundry.

“Yuu-kun.”

“Wha—?! Y-Yes?!”

To be suddenly addressed through the door made Yuu jump out of his skin.

“About what happened earlier...”

“Oh, that... I’m so glad they’re both safe.”

“Yeah.”

A brief silence followed────

“Um... Yuu-kun, about me...”

Yurika was about to get to the heart of the matter.

“Uh... can I... can I come in for a bit? It’s hard to talk through the door.”

“O-O-Of course you can’t!”

“I’m coming in.”

Click!

“Whaaaaaa?! Why are you coming in?!”

Yurika had actually come in.

No matter how much Yuu prided himself on his "Iron Wall Virginity," he couldn't maintain his defense in a bathroom where all his armor had been removed. Like Minamoto no Yoshitomo, who was assassinated in his bath, Yuu was wide open for Yurika’s invasion.

“Gah! Don’t look!”

Yuu covered his face with both hands.

When they’d bathed together as kids, he’d always tried to steal a peek, but now he was desperately blocking his own vision.

If he saw her naked, he knew he wouldn't be able to control himself.

“It’s okay to look. I’m wearing a swimsuit.”

“Huh?”

Hearing "swimsuit," Yuu cautiously opened his eyes.

“I brought one from my room. I really wanted to talk to you.”

Standing there was Yurika in a swimsuit, looking like a literal goddess.

It was a black bikini with very little fabric.

The triangular top emphasized her bursting, ample breasts, drawing the eye to the seductive curves of her cleavage and side-boob.

The bottoms were low-rise, boldly exposing her smooth lower abdomen.

The contrast between her narrow waist and her thick, fleshy hips was exquisite, creating a silhouette of perfect sculptural beauty. The rounded line of her rear was proudly on display, and the way the swimsuit bit into her skin slightly was a dream come true for any butt-fan.

Yuu’s eyes were glued to her.

“Guh-haaaa! The destructive power is staggering!”

“Wh-Whaaa? This should be safe, right?!”

(Note: It is safe.)

“It is not safe at all!”

His relief at hearing "swimsuit" was short-lived as Yuu was struck by the sheer offensive power of her appearance.

Not even the Seven-Fold Shield of Ajax the Great could have blocked the sight of his sister in such an overwhelming swimsuit.

“Jeez, Yuu-kun, you perv. Nothing erotic allowed, remember?”

“The only thing erotic here is your swimsuit!”

Actually, it wasn't the swimsuit—it was Yurika’s captivating body that was erotic.

“Here, I’ll wash your back. Sit down.”

Yurika picked up the body soap, lathered it into a foam in her palms, and began spreading it across Yuu’s back. It seemed she was sticking to her "washing by hand" method.

“Wait, hold on... urgh.”

“It’s fine, it’s fine~”

Yurika’s slender, beautiful fingertips slid across Yuu’s back with a squelching sound.

As she washed his back, it was only natural that her hands would occasionally slip around to his front.

“Aaaaah! It feels so good.”

Between the devastating swimsuit and the erotic hand-washing, Yuu’s defenses were stripped away, leaving him unable to resist.

(Aaaah... Dad, Mom... I’m sorry... I feel like I’m about to step into a world of forbidden immorality. I’m about to have sex with my sister while our parents are away. I think... I think I’m done for...)

Whether she knew Yuu was at his limit or not, Yurika stopped her hands and leaned in close. Wrapping her arms around him, she pressed her face against his ear.

“Yuu-kun, thank you...”

“Huh?”

Squeeze!

Yurika wrapped her arms around Yuu’s neck, pulling him into a protective embrace.

“When I was crying, you said you’d protect me forever, didn't you? That you’d always be by my side. That you’d make me happy.”

“Y-Yeah...”

“I was so happy. Knowing that you think of me so much. That you treasure me. I could really feel all your emotions.”

As she spoke, Yurika squeezed the arms she had wrapped around him, as if refusing to let go.

“It made me happy when you protected me from those guys, too. Yuu-kun, you’re not just a little brother anymore—you’re a man who can protect me.”

“Onee-chan...”

Yuu felt vindicated. To be recognized as a full-grown man by the Yurika he admired...

To him, it was an honor greater than any treasure.

He’d taken to calling himself the Commander of the 《Holy Yurika Knights》 and worshipping her from afar, but to be acknowledged by his beloved sister was the ultimate glory.

“By the way... Yuu-kun, you said you 『love』 me, didn't you?”

Twitch!

That was Yurika for you—dropping the bomb right when he was feeling noble.

“Hmm~ I didn't know you loved your Onee-chan that much~?”

“Urgh............”

“Come on, say it again ♥ Do you really love Onee-chan?”

She began rubbing her hands across Yuu’s chest.

“Come on, say it again ♥ If you don’t, I’m gonna do something really intense to you ♥”

Her wandering hands began to slide downward.

“Wait, not there!”

“Look out ♥ Yuu-kun’s precious part is in a real pinch ♥”

“I-I’ll say it! I love you, Onee-chan! I love you! I love you more than anyone in the world! Onee-chaaaaaan!”

“Nngh ♥ Ah ♥ Haaah... ♥”

Hearing him say he loved her, Yurika—who had been the one on the offensive—instantly collapsed.

Hearing the words 『I love you』 from her beloved Yuu flooded her body with happiness, sending her into a state of pure heaven.

“Yu-Yu-Yuu-kun! I—I love you too! I love you, Yuu-kun!”

“........................”

“Wait, what?”

“........................”

◆ ◇ ◆

Yuu had been carried out of the bathroom and was now lying on the living room sofa. The sheer intensity of his excitement had caused him to faint.

Yurika was currently fanning him with a hand fan.

“Yuu-kun, are you okay...?”

“Y-Yeah. I just got a little too excited...”

“Geez, I was so worried. You just suddenly went limp.”

Yuu had woken up, but his memory was hazy.

(Wait... I think... right before I blacked out, I thought I heard Onee-chan say 『I love you too』. Was that a dream...? Which was it...?)

Yuu was soaking in sweet, melting emotions, but when he thought about it calmly, he realized he had a major problem.

(No, hold on! Why am I wearing clothes I don’t remember putting on? If I fainted in the bath... does that mean she saw everything?!)

“Um, Onee-chan, you’re the one who carried me, right? And these clothes...”

Yuu asked cautiously, and the way Yurika’s face flushed red told him everything he needed to know.

“Y-You didn't?!”

“Ah ♥ Well ♥ Yuu-kun, you’re... you’re actually quite impressive ♥ You’re a real adult, aren't you ♥”

“Waaaaaaaaah! She did see it!”

She’d seen everything. Now she knew about both his feelings for her and his "equipment."

It was beyond embarrassing.

“Aaaah... my dignity...”

“So, Yuu-kun ♥ Shall we go to bed?”

“Huh............?”

Yurika began dragging the bewildered Yuu toward her room.

This long day—a mixture of chaos, sweetness, immorality, and happiness—was far from over, with a night of both lewdness and innocence yet to come.

Waiting for Yuu, who had been completely exposed, was it to be a "merging" with his wild, perverted sister, or a sacred embrace of peace?

Yurika, who was now fully "switched on," dragged Yuu into her room before he could even resist. It seemed she was intent on making him sleep beside her.

No, with her current energy, she might go beyond co-sleeping and head straight for "merging." At this rate, Yuu’s virgin days were numbered.

“Wait, Onee-chan. Hold on.”

“I can’t wait... I just can't wait anymore.”

Yurika stared at Yuu with a serious expression.

“It’s your fault, Yuu-kun. I’ve been tempting you this whole time, and you never accepted me. But then you went and said you love me.”

“What?!”

“Once you confess that you love me and tell me you’ll protect me forever and make me happy, I just can't hold back anymore~”

Hearing Yurika say that, Yuu finally realized.

“Wait... does that mean you... you actually liked me too, Onee-chan?”

“Of course I do! I’ve been throwing 'love-love' hints at you non-stop! I wouldn't kiss someone or sleep in the same bed with them if I didn't love them!”

“I... I guess that’s true...”

Only now did Yuu finally understand the meaning behind Yurika’s constant affection.

(That’s right! There’s no way Onee-chan would be so touchy-feely with someone she didn't like!)

Maki, her friend, had mentioned it—how so many guys had confessed to her, only for her to turn them all down. She rejected men so consistently that some even misunderstood her as a man-hater.

That was it.

Yurika always came straight home after her lectures; she never participated in clubs or parties. On her days off, she’d either lounge around the house or flirt with Yuu.

She had only ever had eyes for Yuu.

“Waaaaaaaaaaaaaaaaaaaaah! Our feelings were mutual the whole time!”

Yuu clutched his head at his own denseness.

“Geez, Yuu-kun, you big dummy ♥”

“I’m sorry.”

“But I’ll forgive you ♥”

“Ehehe.”

“Yuu-kun ♥ I love you ♥”

Yurika confessed her feelings, her eyes sparkling and moist.

“I... I love you too, Onee-chan!”

(I’m so happy... she loves me back. We love each other. But...)

Having both confessed their love, their excitement reached a fever pitch. But with the bed only a step away, Yuu pulled back.

“Wait a second.”

“I don’t want to wait ♥ Let’s get into bed ♥”

“I can’t do that, Onee-chan.”

“I said I’m not waiting! We love each other, so we’re going straight to the sheets! It’s a 『Straight-to-Sheets-Express』! ♥”

Yuu took Yurika by the shoulders, his expression turning solemn.

“I love you, and you’re the most important person to me.”

“Yuu-kun...”

Under Yuu’s direct gaze, Yurika caught her breath.

“That’s exactly why I have to wait. I won't start an official relationship with you until I’ve graduated and reached an age where I can take responsibility. I’m going to make sure our parents accept us one day! I promise I will make you happy!”

“Uuuu ♥ Yuu-kun ♥”

Being stared at with such honest eyes and receiving such a sincere confession left Yurika overwhelmed with emotion, excitement, and a certain "overflowing sweetness."

She was so happy she felt like she was going crazy.

She was already a bit strange, but that was one thing and this was another.

(Yuu-kun... you’re taking me so seriously. I’m so happy! I’m so happy I’m embarrassed by how much I just wanted to jump his bones! But... but... leaving it at this is total torture!)

At the words "we can't date yet," Yurika’s frustration began to boil over.

(I understand how he feels and I want to treasure it. But I’m at my limit too! I’ve spent every night doing forbidden things alone because I’m so lonely I’m going insane!)

Yurika instantly began to scheme.

(Alright, I’ll respect his feelings... but it would be okay if Yuu-kun was the one who couldn't take it anymore and begged me for sex, right? ♥ I’ll just have to go beyond simple skinship and launch a full-on erotic assault!)

It seemed Yurika had reached a conclusion. Though it didn't seem much different from her usual behavior.

“So, for today, we’re going to be on our best behavior────”

As Yuu continued his serious speech, Yurika gently placed an index finger over his lips.

“Yuu-kun, your feelings make me so, so happy. Thank you.”

“Onee-chan.”

“But... I wonder if you can really hold back?”

“Huh?”

A smile played at the corners of Yurika’s mouth.

“You might find yourself unable to take it anymore and end up doing something erotic to your Onee-chan.”

“Urgh, well...”

It was true. Even until now, he’d been exercising extreme self-control, yet he’d nearly lost it multiple times. With his sister getting more charming and sexy by the day, Yuu didn't know if he could really stay strong.

“I’ll show you. I can do it.”

“I wonder~?”

“I will definitely endure it.”

Yuu made a bold declaration, exactly as Yurika had planned.

“Then, what if you can’t endure it?”

“Huh?”

“If you lose control, you have to accept a punishment, okay?”

“Sure. I’m going to endure it anyway.”

“Then if you can't hold back, you have to give me your absolute obedience.”

Once again, Yurika brought up the "absolute obedience" rule.

“If you can endure it, you win. If you can’t, I win. That’s the deal, okay?”

“Y-Yeah... understood.”

“Alright, it’s a promise! I’m gonna tempt you sooooo much, Yuu-kun, so you’d better try your best to stay strong. If you lose, it’s absolute obedience for you!”

“Wait...”

“If you lose, you have to date me and do everything I say. And sex will be twice a day. Okay, the battle starts now!”

“Wait? What? Huh?”

Before Yuu could process what was happening, the terms of the match had been decided. He’d been tricked by Yurika’s schemes so many times, yet he’d fallen for the same trap again.

There was no way the honest and easily deceived Yuu could win against Yurika, who was a master of "Furin-kazan" strategy when it came to eroticism.

From now on, Yuu was destined to be under constant erotic assault from his sister twenty-four hours a day. There was nowhere left to run.

“Waaaaaaaaah! I’ve been framed!”

“The only thing getting 'framed' is you by me ♥”

“I don’t need your dirty puns!”

As Yurika giggled at her own lewd joke, Yuu found himself thinking she was "a little cute" while also worrying about how serious she actually was. Truth be told, despite his complaints, his heart wouldn't stop racing.

“M-Move over, Yuu-kun! Don’t be so on guard. We’ve been flirting like this for ages anyway.”

“I... I guess so. We’ve always been close, so I guess nothing has really changed.”

Yuu found himself agreeing with her. Or rather, he’d been talked into it.

Gleam!

Yurika’s eyes flashed.

(Ehehe ♥ Poor Yuu-kun! You’re dead wrong if you think things are the same as before! Now that I know we both love each other, I’m not going to hold back at all! If we love each other, there’s no need for restraint!)

...As if she’d ever practiced restraint to begin with.

(I’m gonna do lots and lots and loooots of erotic things! I’ll give him such ruthless, merciless punishments that he’ll be crying and begging me for sex! I’ll even throw in some perverted stuff too! It can’t be helped, because I love him so much ♥)

Her increasingly "out" fantasies were unstoppable.

Later, Yuu would come to know Yurika’s true terror—his perverted sister’s absolute degeneracy.

Yuu braced himself for the start of a long era of "Romantic War," but Yurika was currently fidgeting and looking up at him with suggestive glances. She was radiating an aura that practically screamed for attention and affection.

“What is it, Onee-chan?”

“Yuu-kun, aren't you forgetting something?”

(Huh? What is it? No, more importantly, Onee-chan is way too cute when she fidgets like that! Aaaah! Everything she does is cute! I could stare at her for the rest of my life.)

Yuu was so captivated by her beauty he wasn't even listening.

“Yuu-kun! Geez... we just confessed, so shouldn't there be a vow-sealing kiss?”

“Wha—?! Wh-Wh-Whaaaaaat?!”

Yurika wanted proof. On the anniversary of their mutual confession, she wanted a kiss to swear their eternal love.

“But... if we kiss, things might get... erotic...” Yuu hesitated, worried they’d lose their brakes.

“Yuu-kun. We both confessed our love, right?”

“Yeah.”

“Then we need a kiss to seal the vow. What if you go to college and fall for some girl in your class? We need a vow to ensure that betrayal won't be forgiven.”

“I... I guess that’s true. I’ll never love anyone but you, Onee-chan. I’ll never fall for another girl. I swear it!”

“Then it’s time for the vow-sealing kiss, Yuu-kun.”

The two of them embraced, staring into each other's eyes.

Yurika’s stunningly beautiful and adorable face drew closer, her moist eyes focused only on him. It was as if Yuu was the only thing that existed in her world.

“O-Onee-chan...”

“I love you, Yuu-kun.”

“I love you too.”

Their faces drew closer until they overlapped.

A kiss to swear their eternity—the first of their lives, feeling like it could be their last.

Yuu gently touched his lips to Yurika’s.

Mwah—

It was supposed to be a gentle touch of lips against lips──── or so he thought.

“Mwah ♥ Slorp ♥ Mmm ♥”

“Mmph?!”

Yurika’s kiss was far more intense and deep than Yuu had imagined.

Grab!

Yurika wrapped her arms around Yuu’s neck, locking him in place so he couldn't move.

“Mwah ♥ Mmm ♥ Schlop ♥ Nnngh ♥”

“N-Nngh... mmmph!”

Yurika’s tongue slid deep into Yuu’s mouth, tangling, licking, and sucking with abandon. This was a full-blown adult kiss.

“Nngh ♥ Schlop ♥ Mwah ♥ Mmm... Yuu-kun, I luh you... I luuuuuuuv you ♥ Mwah ♥ Nnngh— mwah ♥ slorp ♥”

After a long, long, incredibly long first kiss, Yurika finally pulled her face away.

Lick!

“Hehe ♥ We finally kissed ♥”

Having launched a full-scale adult kiss, Yurika licked her lips and wore a bewitching smile. Despite it being her first, she was incredibly aggressive and offensive. She truly was a Succubus Lord.

“Ah, let’s do one more!”

“Whaaaa?!”

Yurika kissed him again.

The second kiss happened only seconds after the first.

“Mmm ♥ Mwah ♥ Schlop ♥ Nngh ♥ Mwah ♥ Phaaah ♥”

She savored the second adult kiss to her heart’s content before finally letting go.

“Ehehe~ ♥ Yuu-kuuuun ♥”

“Th-That was too intense for a first time.”

“Yuu-kun, the eternal vow is complete. No kissing other girls allowed.”

“I wouldn't do that anyway.”

“Hehe... Yuu-kun... no other girls for the rest of your life. I won’t forgive you if you break it.”

Yurika’s aura turned slightly chilling, like a heroine from a yandere anime.

“Oh, I forgot to mention... I’m incredibly jealous, so I won’t forgive you if you flirt with anyone else, okay?”

She was smiling, but her eyes weren't laughing at all.

“I... I know you’re jealous without you even telling me.”

Yuu shrugged his shoulders. He’d known that for a long time.

“I’m never giving you to anyone else ♥ You’re my Yuu-kun, and only mine, right? ♥”

Yurika’s possessiveness was spiraling out of control; she was talking as if they were already a couple. Even though the "battle" hadn't even concluded, she was clearly convinced they were dating.

And Yuu realized that from the very beginning, he’d never stood a chance in this fight.

Despite her perfect looks, this yandere-ish sister with her "heavy" love also had a possessiveness that was dangerously off the charts.

◆ ◇ ◆

Chirp, chirp, chirp—

Outside the window where the morning sun streamed in, small birds were chirping energetically.

Yuu, lying in his sister's bed, had finally learned the true meaning of fear. It was as if he were mourning his own foolishness for engaging in a battle he had zero chance of winning.

(I messed up! I didn't have a snowball's chance in hell. Why did I ever think I could challenge her? Onee-chan is just too powerful!)

Next to Yuu lay Yurika, her sleeping face the picture of pure bliss.

It looked for all the world like a classic 『morning chirp』 scenario, but strictly speaking, it wasn't.

He had simply spent the entire night being smothered in kisses filled with an overwhelming amount of affection.

These were Yurika’s kisses—kisses that functioned as both an enchantment and an aphrodisiac. Through this "love training" that scorched both body and soul, melting everything in its path, Yuu felt as though a mark of servitude was being etched into every single cell of his being.

◆ ◇ ◆

To go back a few hours...

After being dragged into Yurika’s room, Yuu had faced the greatest crisis of his life.

"Yuu-kun, it’s about time we went to sleep, don't you think? ♥"

"Yeah, well... about that... I'm heading back to my room now," Yuu said, trying to make a break for it.

Grab!

Yurika snatched his hand before he could retreat.

"Yuu-kun, where do you think you’re going?"

"L-Like I said, back to my room."

"Oh? Does that mean Yuu-kun is okay with a forfeit? Are you losing by default?"

"Urgh..."

"If you forfeit, Onee-chan wins. That means absolute obedience," she purred, starting to undress.

"D-Don't take your clothes off!"

"Ehh? But Onee-chan always sleeps naked!"

"You always wear pajamas!"

"Tch. You caught me."

Even though he’d managed to stop Yurika from stripping, he still ended up being dragged into the bed for a "co-sleeping" session.

Since this was their first time sharing a bed after the confession, both of them were feeling a level of excitement that surpassed anything they’d experienced before.

"Yuu-kun... ♥ Mngh... ♥"

"Ugh... ngh..."

Yurika climbed on top of him, interlacing their fingers in a lover’s grasp while pressing a passionate kiss against his lips. Despite all the talk of a "battle," they looked like nothing more than a deeply lovestruck couple.

"Chu... ♥ Smack... ♥"

First his cheeks, then everywhere but his lips, and finally, his lips themselves.

Yuu found himself entirely on the defensive against the onslaught of his sister’s advances.

Being honest and good-natured to a fault, Yuu slowly gave in to Yurika’s pleading, and as a result, things had escalated... significantly.

"Ham... ♥ Ngh... chu... ♥ Schlip... ♥"

"Nnh... aah... O-Onee-chan, let's just go to sleep already."

"No way. I'm not letting you sleep until morning."

"Whaaaaaaaaaat!?"

Yuu was genuinely terrified by the sheer intensity of Yurika’s displays of affection.

One moment it was a heavy French kiss, the next it was a series of cute, pecking kisses—he wasn't allowed a moment's rest in the storm of her rhythmic caresses.

With his fingers locked in hers, he couldn't resist at all. His lips, cheeks, ears, neck, eyelids, and forehead—she claimed every inch of him.

In a house where no one would come to his rescue, Yuu was thoroughly and deeply "trained" by his succubus Onee-chan, her mark being carved into the very depths of his body.

And so, the night of intense love-making (of the oral variety) ended, and the 『morning chirp』 transitioned into a 『morning smooch』development.

"Haaa... I'm beat. That was one hell of a night."

After being teased with kisses all night long, Yuu was physically and mentally drained, his legs feeling like jelly.

Seeing Yuu gallantly trying to endure it all had made Yurika’s heart go thump-thump, leading her to shower him with even more kisses while acting like a spoiled child. It had been a night of such high-level intimacy that it was hard to tell if it was heaven or hell.

"Funyaa... ♥ Yuu-kun... mumble..."

Looking at Yurika as she talked in her sleep, Yuu suddenly remembered the "battle" and went pale.

"Uwaaaaah! W-What am I gonna do!?"

He clutched his head.

"No, wait... Parents are coming home today, so Onee-chan should go back to normal, right? Yeah, she has to—Wait, there's no way in hell that's happening!"

He couldn't help but call out his own delusion.

"Knowing her, she’ll probably say something like, 『Doing dirty stuff while hiding from the parents is so taboo and exciting!』 She’s a total pervert sister! A complete lost cause!"

"Nnh... ♥ Mwah... Geez, Yuu-kun, you're being so noisy this early in the morning."

Yurika woke up at his shouting. As she sat up sluggishly, her hair fell over her face, giving her an irresistibly sexy look.

She leaned into him, tangling her arm with his.

"Ahhh... ♥ Yuu-kuuuun... ♥ Give me a good morning kiss. Mmm."

She puckered her lips toward him.

Apparently, a whole night of kissing wasn't enough for her.

"Uwaah! I’m gonna turn into an idiot if I keep living this kind of erotic life!"

Despite his protests, Yuu didn't hesitate to deliver the requested morning smooch.

While they ate breakfast together, Yuu tried to set some firm boundaries regarding her "perviness."

"Listen, once the parents are back, you have to stop the lewd stuff, okay?"

"Ehh... I dunno, should I?"

"I have nothing but bad vibes about this..."

"Hehe... Teehee... 『I love you so much, Onee-chan!』"

"I didn't say it like that! And I didn't say 'so much'!"

"Ufufu... ♥"

Radiating an aura of pure happiness, Yurika mimicked Yuu's voice. Her little "fhehe" laugh was actually a bit creepy.

It seemed this pervy sister of ours was going to milk his confession for all it was worth. She was clearly over the moon.

"Haa... Yuu-kun was so cute yesterday. I should've recorded it on my phone."

Even this early in the morning, Yurika was crossing lines.

"Hey, say it one more time. 『I love you so much, Onee-chan!』"

She stealthily held up her phone.

"Not a chance. And I never said it like that anyway."

"Ehhh, stingy."

Even after the meal, they were all over each other on the living room sofa. If left to their own devices, they’d probably spend the whole day flirting.

Yuu finally decided to try a different tactic.

"Onee-chan, don't you want to go out and play or something for a change?"

"Ehhh... I want to play with Yuu-kun."

"Is this... is this just gonna keep going forever?"

"I think it’ll last for the rest of our lives~"

"You've gotta be kidding me..."

During the night, she was a devilish sister, and during the day, she was like a kitten, purring and acting spoiled.

Even Yuu, who was a total "Onee-chan lover," found himself a bit taken aback by her intensity.

Rattle, clack—

Just then, the sound of a key turning in the front door echoed through the house.

The accident must have cancelled their trip, bringing the parents home earlier than expected.

"Ah, looks like Mom and Dad are back."

Gleam!

At Yuu's words, Yurika’s eyes lit up with a predatory spark.

"Hehe... Yuu-kun... ♥ Chu... ♥"

"Waph—!? Mngh..."

Yurika deliberately started kissing him just as the parents were entering.

"Ngh... wait... stop! They’ll catch us..."

"Kiss... ♥ Schlip... ♥ See, Yuu-kun? Dad and the others are almost here. Mwah... ♥"

She kissed him as if she were savoring the thrill, pushing him into an erotic corner.

As it turned out, she was a devilish sister during the day, too.

Click!

Thud—

"We're home."

"We're back!"

The parents' voices came from the entryway. They were only a single wall away.

"Nom... ♥ Chu... ♥ Schlip... ♥"

(Onee-chan... I can't... they're gonna find out...)

Caught between a sense of taboo, shame, and sheer panic, Yuu trembled with a pleasure so intense he felt like he might black out.

The very moment Yuu was about to break, Yurika swiftly pulled away and headed for the entryway as if nothing had happened.

"Welcome home. That must have been awful for you."

When Yurika appeared at the door, the parents visibly relaxed.

"Yeah, it was a real disaster. I never thought we'd get caught up in an accident like that."

"It was truly terrifying. I thought we were going to tumble right off the cliff," Emiko added.

Even after all that intense kissing, Yurika was chatting with them normally. Her nerves were made of steel.

"I'm just glad you weren't hurt."

"We couldn't exactly die and leave you kids behind, could we?"

Mikiya and Emiko looked at each other, relieved to be safe.

"W-Welcome back," Yuu said, peaking out from the living room.

"We're home, Yuu-kun... Oh? Yuu-kun, you've got an injury on your face."

Mikiya noticed the mark on Yuu's cheek.

The scratch from the scuffle with the pick-up artist hadn't been much, but after Yurika had spent the whole night sucking on his skin, it had swollen up a bit.

(Sorry, Yuu-kun... Onee-chan might have gotten a little too excited and sucked too hard...)

Yurika made a guilty face.

"H-Hey, Yurika..."

Seeing her expression, Mikiya misunderstood the situation completely.

"Wait, it's not what you think! Well, it is partially my fault, but..."

"No matter how much you believe in 'tough love,' corporal punishment is..."

As Mikiya started to scold her, Yuu jumped in to save her.

"It’s not Onee-chan’s fault! I just... bumped into something on my own."

"Is that so...?"

Given Yuu's own testimony, Mikiya accepted the explanation, though he still looked suspicious.

"Honestly! I would never hit Yuu-kun!"

Misunderstood by Mikiya, Yurika crossed her arms and puffed out her cheeks in a pout.

Even Onee-chan’s pouty face is cute, Yuu thought.

◆ ◇ ◆

The four of them moved to the living room, and the parents finally looked settled as they sat on the sofa.

It had been an accident that could have ended poorly, but now that everyone was home and safe, they all breathed a sigh of relief.

Yuu spoke up, his expression softening.

"I'm just glad you guys are okay. When we heard there was an accident, Onee-chan was a total mess, crying her eyes out."

"Wait, Yuu-kun! Why would you say that!?"

Yurika panicked.

This was Yuu’s petty revenge for being toyed with all night long.

"That sounds just like Yurika," Emiko smiled.

"Haha, sorry for making you worry."

Laughter filled the living room.

If a tiny coincidence can change destiny...

If their parents had remarried different people...

If they had only met by a one-in-a-million chance...

Both Yuu and Yurika couldn't help but pray to whatever forces govern fate, thanking them for this miraculous encounter with their most beloved person.

Since then, Yurika’s "night raids" had become a frequent occurrence, and Yuu spent every night in a state of high-tension, heart-pounding suspense.

"Nnn... ♥ Yuu-kuuuun... mumble..."

"Onee-chan! Wake up! Mom and Dad are gonna catch you!"

Today, like every other day, Yurika had crawled into Yuu's futon.

She pressed her soft breasts against him, tangling her thick, beautiful legs with his.

Whether she knew she was pushing Yuu past his limit or not, Yurika showed no signs of letting up her assault.

"Mnh... ♥ Yuu-kun, good morning~"

"Uwah! I'm telling you, they're gonna find out!"

"It’s fine for a little longer~"

"It is not fine!"

She was deliberately stoking Yuu’s sense of shame and taboo, shaking his heart with the fear of being discovered.

It was as if she were using the 『Suspension Bridge Effect』to push him further and further into a corner. Yuu was completely at her mercy—a literal slave to her love.

"Mm."

Yurika turned her face toward Yuu and puckered her lips. This was the signal demanding a morning smooch.

Yuu kept glancing nervously at the door as he gently pressed his lips to hers.

"Geez. Onee-chan..."

"Chu... ♥ Mmm... ♥"

The day began with a good morning kiss. Once it was over, Yurika would leave the bed and return to her own room.

"Yuu-kun, let's flirt more later, okay!?"

Click!

Left alone in bed, Yuu clutched his head.

"Uwaaaaah! What am I supposed to do!?"

He was being teased every single day, subjected to an impossible barrage of erotic attacks.

Even if he wanted to resolve his building desires through... less than wholesome means, he never knew when Yurika might burst into his room.

If he tried it while she was home, she’d probably sense the "erotic waves" and barge in shouting, 『I found Yuu-kun playing with himself!』

Yuu was forced into a state of "self-imposed masturbation restraint," spending his days in agony while thinking of the sister he loved so much.

(Is this gonna keep going until I admit defeat and agree to date her? No, wait... I feel like if we actually start dating, it’ll get even more intense.)

Yuu was completely trapped in Yurika’s web.

Yurika’s goal was to tease him until he reached his absolute limit, hoping he’d eventually make a move on her and create a "fait accompli."

And yet, seeing Yuu gallantly and seriously continuing to endure her advances made her heart ache with affection.

Yuu's earnestness only served to stimulate the "S" side of her personality.

Preventing him from doing it alone and even plotting to manage his... releases... she was truly a terrifying sister.

Actually, she was a total "Out" sister. Beyond the pale.

And yet, despite all this, Yuu didn't hate her at all; he only loved her more.

It was truly a feat only possible through love.

After washing his face, Yuu walked into the dining room to find breakfast already prepared and his parents seated.

As Yuu headed for the kitchen, for some reason, Yurika opened the refrigerator door.

"Onee-chan, what are you doing?"

"Ah, perfect timing. Yuu-kun, grab this for me."

The moment Yuu stepped into the blind spot created by the fridge door, Yurika moved like lightning.

"Chu... ♥"

"Mngh!?"

Using the cover to stay out of their parents' sight, she snatched a kiss from Yuu's lips in an instant. Her boldness and speed were terrifying.

"There it is. Thanks, Yuu-kun."

With a perfectly straight face, Yurika returned to her seat.

Yuu remained standing there, frozen in a mix of embarrassment and joy.

(Grrr... Onee-chan! Please, just don't do that in front of our parents... My heart's gonna stop one of these days...)

To hide his reddened face, Yuu raised a hand to his eyes and returned to the table while putting on his best chuunibyou act.

"Hmph... 《Demonic Lightning Strike: King of Fiends Electrifying Whirlwind Fist》! Blow, O whirlwind! Roar, O flash of the Thunder God!"

Emiko’s eyebrows twitched.

"Dear, I think Yuu is watching too much anime. He’s being influenced by some very strange things."

"Well, all kids watch anime these days. It’s normal to be influenced at this age," Mikiya said, ever the understanding father.

Grin—

While the parents were talking, Yurika stared at Yuu with a meaningful smile.

Yuu only fell for her harder.

(Ugh... even though she's attacking me like this every day, I'm in trouble because I love Onee-chan way too much. In fact, I feel like I'm liking her more and more. Does she really have some kind of demonic power...?)

Radiating an aura of sexiness so thick it was almost visible, his sister really might have the magic of a succubus.

◆ ◇ ◆

Entering the classroom, Yuu sat at his desk and struck a dramatic pose, crossing his arms with an air that suggested he was thinking, Hmph... so this is fate...

Takami approached him immediately, looking like she’d found something entertaining.

"Yuu, what's with that weird pose?"

"Ah, Chuujou-san. Morning."

"What’s up? Did something happen?"

She was as curious about Yuu as ever.

"N-No, nothing in particular..."

(Bad... I can't exactly tell her I'm kissing my sister every day... Ugh, I want to say I'm climbing the 'stairs to adulthood,' but I definitely can't say I'm doing erotic stuff with my sister.)

As Yuu hesitated, Takami’s interrogation intensified.

"Hey, haven't you been acting weird lately? Come on, tell me."

"It's really nothing."

"Don't play hard to get. You had a face that was practically begging someone to ask you just now."

At his refusal to answer, Takami’s tone grew sharper.

Yuu was caught in a dilemma—he wanted to brag, but he couldn't. It was the classic male desire to be seen as a bit more "adult," even though he was undeniably still a virgin.

"I bet your Onee-chan caught you with an erotic book or something, didn't she?"

"Gah!"

"Ah, I hit the bullseye."

In reality, Yurika checked his bookshelf regularly, so his erotic books were "sister-approved."

As long as the content was 『Sister Love』 or 『Older Sister Type』, there was no problem. However, if it had been 『Classmate』 or 『Younger Girl』 themed, Yurika’s jealousy would have likely exploded, and the books would have been banned.

By keeping sister-themed porn, peace in the household was maintained.

"Lately, Onee-chan’s been going wild... it’s actually getting kind of scary."

Yuu tried to spin Yurika’s jealousy into a story about a "scary older sister."

"That's probably because you're always acting up."

"I'm being perfectly normal! It’s just, Onee-chan’s suddenly into pro-wrestling, and she keeps trying out these intense submission holds and joint locks on me."

"Pfft—hahaha! What is that? You guys are like elementary schoolers!"

Takami burst out laughing.

"Playing pro-wrestling" sounded like something elementary school siblings would do, but in reality, they were engaging in very "adult" wrestling.

Being tangled up, pressed against her large breasts or soft thighs, and being punished by her smooth, supple legs—it was a reward in disguise.

"Hey, can I come over to your house again? I want to ask your sister to help me study, too."

"No, no, no, no! Absolutely not! Onee-chan’s been in a bad mood lately, so it’d be terrifying if I brought someone over."

Yurika was usually in a great mood, but the moment Yuu brought a girl home, that mood would plummet. Lately, she’d become especially jealous; even just glancing at another woman was enough to get him "punished."

Better to let sleeping dogs—or in this case, a wrathful goddess of a sister—lie.

"Well, I guess I can't help it then. Your sister does seem pretty scary," Takami agreed.

Yuu had managed to navigate the situation by pretending his sister was just a terror.

◆ ◇ ◆

After school, Yuu had gone to the station area to do some shopping. For some reason, Takami was with him. She’d just followed him on her own.

Once again, it looked like they were on a date.

The two of them walked into the 【Shopping Mall】 together. If Yurika saw this, his "punishment" would be guaranteed.

"Are you looking for something, Chuujou-san?" Yuu asked as she kept pace right beside him, just like a girlfriend would.

"Hm? Not really. It’s just fun to tease you."

"Ugh..."

(Why am I surrounded by girls like this...?)

Just as Yuu thought, he always seemed to get tangled up with older women who teased him or rowdy girls who messed with him.

It was likely because he radiated an "innocent" aura and looked like a "pure-hearted virgin" from a mile away.

It was, quite literally, his fate.

But a crisis was approaching Yuu.

"Hey, look. This would look good on you."

Takami found some cat ears in the party goods section and tried to put them on Yuu's head.

"Wait, that's embarrassing!"

"It's fine! Just wear them. Though I guess you're more like a dog than a cat."

"Ugh... I'm like a dog?"

"Should I make you my pet and take you home with me?"

Takami’s eyes gleamed with a predatory light. Was it due to her sadistic streak? She seemed like she really did want to make Yuu her pet.

"Come on, say 'woof.' Hehehe."

"Uuugh, stop treating me like a dog."

"Ahaha! Yuu, you're so funny!"

"Close! You're too close!"

Caught up in the moment, Takami pressed closer to him. She was likely just joking, but to any onlooker, they looked exactly like a couple.

Clack!

"Yuu... I wonder what you think you're doing?"

A cold, sadistic voice echoed from behind the flirting classmates.

It was Yurika, sounding like a ruthless prison warden.

Yuu turned around and froze in terror.

"O-Onee-chan..."

"Ah, hello. Good afternoon," Takami greeted her normally, even as Yuu was shaking beside her.

"Oh, Chuujou-san. Good afternoon."

"Yes, it's been a while, Onee-san."

At Takami's use of "Onee-san," Yurika’s eyebrow gave a sharp twitch.

From Takami's perspective, it was a respectful term for the older sister she admired. But to Yurika, it sounded like a greeting from Yuu's girlfriend.

"You and Yuu seem very close, Chuujou-san."

"Yes, we get along great," Takami replied with a carefree smile.

Even though she was usually "tsun-tsun," it seemed she really did want to be close to Yuu.

As Yurika’s aura grew increasingly foul, Yuu felt his legs turn to lead as he imagined what was coming next.

(Chuujou-san! Why are you acting so friendly all of a sudden when you're usually so harsh!? Onee-chan's gonna get the wrong idea!)

Yurika turned to Yuu, her face stern.

"Yuu, playing is all well and good, but you can't let your studies slide. Entrance exams will be here before you know it."

"Y-Yeah..."

"You seem to have gotten quite lax lately, Yuu. It looks like you need some strict discipline when we get home."

Shiver!

Being glared at by his sister’s cold, sadistic eyes, Yuu felt like a frog being stared down by a snake.

And yet, deep down, thanks to the erotic training he’d received every night, he found himself shivering with anticipation for the "harsh punishment" awaiting him.

This Yurika... the gap between her angelic sweetness and her demonic sadism was massive.

(Scary! Onee-chan is so scary! But... a sadistic Onee-chan is also the best!)

In the end, anything his sister did was "the best."

As Yuu stood frozen watching Yurika walk away, Takami nudged his shoulder with a smirk.

"Oho~, someone’s in trouble. You better get ready to be disciplined real good later!"

"Dammit... I told you she was scary."