Epilogue

Time passed, and Yuu’s entrance exams drew near.

The two of them continued to flirt while hiding from their parents, and thanks to Yurika’s genius-level situational awareness and meticulous erotic planning, they miraculously managed to keep their lovey-dovey relationship a secret.

Though she usually seemed lazy and a bit of a klutz, when it came to anything erotic, Yurika displayed terrifying levels of intellect, stamina, and libido.

However, even with her masterful charms, Yurika hadn't been able to break through Yuu’s iron wall of virginity.

At this point, they were like eternal rivals in a battle manga. The kind where "arch-enemy" is written but read as "friend."

But just as exams were approaching and their relationship seemed to have reached a stalemate, a massive shockwave hit them.

◆ ◇ ◆

Today, Yuu was once again being tutored by his teacher, Yurika-sensei. Her teaching method was a blend of punishment and relaxation.

"Akashi-kun!"

A slightly stern Yurika-sensei was giving Yuu a strict lesson. While she incorporated "punishments," she took the actual teaching very seriously.

"To check your progress so far, I’m going to give you a test. If you pass, I’ll give you a reward... I mean, a punishment."

"Yes, Sensei."

Yuu began the test Yurika had prepared. If he could pass this, the actual entrance exam should be no problem.

Despite her lazy exterior, Yurika had already obtained her teaching license, finished her student teaching at her alma mater, and passed the recruitment exam.

She might look like just a "pervy sister," but beneath the high libido was an excellent academic record.

Her walking around the house in her underwear or acting like a sloth was likely just a front. Probably.

As if to interrupt their private erotic time, a faint sound came from the stairs.

In an instant, Yurika pulled away from Yuu, straightened her clothes, and returned to the face of a strict female teacher. She was a pro at this.

Knock, knock!

"I brought some tea."

Click!

His mother’s voice followed immediately as she opened the door and entered. Yuu felt a mix of relief and slight disappointment.

"You seem to be working hard."

Emiko set down the tea and snacks, her gaze drifting to the tests spread out on the table.

"Oh? You did all of these? That’s impressive."

Every single one of the tests had a passing grade.

"Yes, Mom. He passed the mock exams I made, so I think he’ll be fine for the real thing."

"That’s a relief. I can rest easy then. I’m so grateful to you, Yurika. Thank you."

Emiko bowed her head sincerely. She was truly glad that Yurika had become Yuu’s sister.

"No, it’s nothing. Yuu-kun is my brother, so I’ll do whatever I can to help him. Besides, it’s all thanks to Yuu-kun’s own hard work."

Yurika spoke seriously with Emiko. It was a heartwarming conversation between a step-mother and daughter who had grown close.

While Yuu worried about his secret relationship with his sister, the mother and daughter were getting along perfectly with nothing to fear.

"Then the exams should be fine. Oh, right—I have something important to tell you both later. We'll talk when everyone is gathered for dinner."

Emiko said this with a serious face before heading back downstairs.

The two left behind looked at each other.

"What do you think the 'important talk' is?" Yuu asked nervously.

"Hmm... maybe... a divorce?"

"Whaaaaat!?"

"I’m kidding. They get along way too well for that."

"Geez, don't scare me like that."

Yuu responded with a straight face. If his parents divorced, he’d be separated from the Yurika he loved so much.

Sure, if they weren't siblings, they could date openly, but for Yuu, the thought of being away from his sister for even a moment was unbearable.

At dinner...

Once the whole family was together, Mikiya spoke up formally.

"Actually, my job is transferring me. Starting next fiscal year, your mother and I are going to move to 【Sapporo】."

""Wha-wha-wha-whaaaaaaaat!?""

Yuu and Yurika shouted in unison.

It was a shocking revelation—a massive wave that would fundamentally change their relationship. The shock left them dizzy with a mix of agitation, anxiety, and an uncontrollable surge of desire.

If their parents moved to Sapporo, this house would become their private love nest. They were already flirting like crazy; without their parents around, there would be no brakes at all. In their private love nest, they might become truly taboo, erotic siblings.

Well, they were already pretty erotic, but still.

As the two sat with eyes wide in shock, Mikiya continued.

"At first, I thought about going alone. But Yurika will be a working adult next year, and Yuu-kun is responsible enough, so I figured you two would be fine on your own."

Emiko added, "Watching Yurika guide Yuu with such 'tough love' made me realize I could leave him in her hands. Yuu's grades only went up thanks to Yurika."

"Mom..."

Accepting Emiko's trusting gaze, Yurika looked at Yuu with an expression that seemed to say, 『I will raise Yuu-kun into a fine man.』

While the three of them shared a "touching" moment, a whirlwind of emotions was stirring in Yuu's chest.

(Wait, wait, wait! The conversation is just moving forward on its own, but this means we’re gonna be all alone, right? That’s way too dangerous!)

Indeed, Yuu was the only one worried.

(And besides, Onee-chan acts all serious and man-hating on the outside, but she’s actually a super-perv and a total freak! Sometimes she makes this 'guhehe~' face!)

Yuu let his true feelings leak out in his mind. She's a "Guhehe" sister.

Unaware of Yuu's concerns, his parents seemed to place absolute trust in them.

"How about you, Yuu-kun? I want to hear your thoughts before we decide."

"Yuu, you're okay with staying with your sister, right?"

The parents both looked at him. Mikiya, ever the kind father, wanted to make sure Yuu was on board.

"I..."

As Yuu started to speak, he caught sight of Yurika smiling beside him.

Her face was smiling, but he felt an overwhelming pressure radiating from her—a silent command to 『Agree.』

(Ugh... Onee-chan... seriously... I can feel the pressure to agree. If I say no, she's gonna be livid...)

"Y-Yeah... okay. Onee-chan and I will be fine with the house, so don't worry."

Yuu nodded. Mostly because he was afraid of Yurika’s eyes.

"I see. Good. Now we can go with peace of mind."

"Yuu, make sure you listen to everything your sister says."

"I will."

If he listened to everything his sister said, he was likely in for some legendary erotic training, but at this point, he had no choice but to accept it.

His future life of heart-pounding eroticism.

Still, Yuu intended to keep a close eye on Yurika to make sure she didn't lead a too degenerate lifestyle.

◆ ◇ ◆

After dinner, Yurika immediately called Yuu to her room.

She was an "Onee-chan" whose heart was dancing with excitement for their new life starting in April—her head full of dreams and happiness.

"Ahhh~ ♥ I'm so excited! Next year, we'll be all lovey-dovey every single day!"

Yurika let out a strange, almost panting sound. She was a "bubbly-with-excitement" sister.

"I have nothing but concerns..."

Watching her, Yuu shrugged with a "good grief" expression.

"It’ll be fine, Yuu-kun! From April, we'll be together every day. We'll sleep together every day ♥, I'll feed you every day ♥, we'll wash each other in the bath every day ♥, and we'll have sex every day ♥! It’s gonna be the best!"

"Wait, that last one! No sex until we're officially dating! Geez, this is exactly why I'm worried!"

Yuu’s anxiety spiked at Yurika’s string of "out" statements.

"It’s fine~. Once I become a teacher, we'll be together at home and at school for-eh-ver!"

"Urgh..."

That was the reality. If Yurika became a teacher, they really would be together twenty-four hours a day.

"Uwaaaaah! There’s nowhere to run!"

"Let’s just flirt forever~ ♥"

"If you do that at school, we’ll be caught immediately and you’ll be a 'problem teacher'!"

"Ah..."

Yurika’s eyes went wide, as if she were only just realizing this.

Had she really intended to flirt at school like a pair of high school sweethearts? While flirting between classmates might be overlooked, flirting between a teacher and a student was an unforgivable sin.

It was completely "Out."

"Uwaaaaah! I wanted to be Yuu-kun's classmate and have sex in the classroom after school or in the 【PE Equipment Room】!"

"T-Too blunt..."

"Even though I finally became a teacher, I'm gonna cause a scandal and get fired!"

"I'm actually afraid that’ll happen..."

Yurika played the role of the perfect beauty in public, but around Yuu, her true colors were constantly leaking out.

If she went around school shouting 『Yuu-kun! ♥ Yuu-kun! ♥ Yuu-kuuuuuun! ♥』, it would immediately become a "safety incident," and a mass email would be sent out: 『Warning: A suspicious individual claiming to be a female teacher was seen shouting a student's name and attempting to lick them.』

Thump!

Yurika collapsed to her knees in shock.

"Yuu-kun... at school, I won't be Onee-chan; I'll be a strict teacher. I'll treat you strictly as a student."

"I mean, that's just common sense..."

If a family member is a teacher, you have to keep your public and private lives separate.

"It’s decided! Onee-chan will respect the boundary between teacher and student at school!"

"Like I said, that's normal. I'd be in trouble if you didn't."

Yuu gave her a look that said, Is this sister of mine really gonna be okay?

"But, but... it’s okay to flirt at home, right? It’s okay to play 『Classmate Yurika-chan』 in a school uniform cosplay, right!?"

"Uh... cosplay..."

Yuu recalled his sister’s cosplay.

(Onee-chan... she was wearing a sailor suit secretly in her room before. I guess she really does have a desire to be my classmate and have all sorts of 'events' with me.)

Yuu was the type of guy who wanted to fulfill Yurika’s desires.

(If Onee-chan and I had met as classmates... I love her exactly as she is now, but if she wants to flirt as classmates, I want to make that come true for her.)

"Yeah... we can play 'classmates' once in a while."

"Thank you! I love you so much, Yuu-kun! ♥"

Yurika lunged at him for a hug.

"But even with the parents gone, we have to maintain some moderation."

Yuu stopped her hug with his hands, trying to keep the pervy sister at bay.

"Mugyuu! Ehhh? But we're finally gonna be all alone..."

"E-Especially the 'leg discipline' or the 'butt-on-lap' punishment... no weird perverted stuff like that."

"Hehe... you were super excited last time though, weren't you, Yuu-kun?"

"Guh... that's..."

Bullseye.

"I know! Yuu-kun, how about we try out a 'Female Teacher' play right now?"

"Huh?"

Ignoring the frozen, surprised Yuu, Yurika moved with practiced ease. She swiftly produced a pair of toy handcuffs, pushed Yuu onto the bed, and restrained him.

"Wh-What!? Why am I in handcuffs!? And hey, don't take your clothes off!"

Yurika stripped out of her loungewear and changed into a ladies' suit that was stretched tight across her chest. The short skirt gave an uninhibited view of her thick, supple thighs, and she encased those glowing, fresh legs in a pair of beautiful 20-denier black stockings.

As she watched Yuu desperately trying to escape, she lost herself in the memories of when they first met.

(Yuu-kun... I love you. You protected me when my biological mother attacked me, and you protected me from pick-up artists and molesters. You've always stayed devoted to me. Hehe... it's like a miracle that the Yuu-kun I love so much only has eyes for me.)

Then her thoughts turned to Yuu’s chastity.

(But... I didn't think Yuu-kun would hold out this long. I'm happy he takes our relationship so seriously, but even I want to move to the next step already!)

Yuu was fidgeting again, looking restless. His unconscious way of acting "helpless" only made Yurika’s heart ache with desire.

(Yuu-kun, you don't have to look so needy! ♥ I'll give you a proper punishment... Oh, I know! Maybe I'll change things up a bit this time...?)

Yurika’s face suddenly shifted into that of a sadistic sister.

"Yuu, why do you have such a needy look on your face?"

"Eh? Um..."

Yuu couldn't hide his confusion at his sister’s sudden change in atmosphere.

Instead of 『Onee-chan Teacher』, she was now 『Onee-chan Queen』.

Slide...

Straddling Yuu, Yurika poked his body with the toes of her black stockings, letting them slide along his skin.

"Come on, Yuu! Say it: 『Please punish me, Queen Yurika.』"

"Eh? No, I can't..."

Queen Yurika’s foot traced his chest, gently caressing his neck. It reached his chin, and she used her foot to lift it up.

It was a literal "chin lift" with her foot.

"Hehe... what's wrong, Yuu? If you don't say it, you don't get a punishment."

Yuu was completely thrown off by this "authentic" Queen persona—it was something he’d never seen before, and it left him utterly shaken.

(Ugh... even though I'm being subjected to something so humiliating... my body is tingling and I can't resist. Wait! This is supposed to be my kind, slightly airheaded sister. But she feels so real, I can't defy her! This is cheating!)

The artistic beauty of her legs alone was enough, but now they were armored in sexy, sheer black stockings, and her toes were tickling his chin through that thin material.

It was only natural for him to feel a sense of perverted excitement.

(I can't! This is too much! I'm gonna surrender to Queen Yurika and lick her feet!)

An unexpected turn of events had brought Yuu to his breaking point.

Perhaps it was his naturally submissive personality, or perhaps he just liked being attacked by the sister he loved; either way, Yuu was becoming dangerously excited by Queen Yurika.

"O-Onee-chan..."

"Geez, Yuu. Do you really love my feet that much?"

Nudge!

His chin was lifted again by her foot, and a surge of electricity ran through him. Yurika then brought her other foot into the fray.

Rub, rub, rub!

Both of Yurika’s feet, encased in black stockings, rubbed against him as they moved up, tickling the area around his neck.

A few more centimeters and she’d be stepping on his face.

Yurika had tried this new approach on a whim, but whether it was because her hobby of cosplay made her good at getting into character, or because she just loved having Yuu in absolute submission, she was fully leaning into the Queen persona.

(Yuu-kun! ♥ Yuu-kun! ♥ Yuu-kun! ♥ I can't take it! When you make a face like that, Onee-chan’s gonna go crazy!)

She was supposed to be acting, but she was starting to get a little too "into it."

(I was only planning on a little prank! But... it’s okay if I just step on his face now, right? Haa... haa... ♥)

She had become a bit—no, quite a bit—of a perverted sister.

Yuu watched Yurika’s beautiful feet moving from his chin toward his face in a slow-motion blur, like a life-review.

(Ah... I’ve held out this long, but to think I'm gonna fall to a play like this... I guess it can't be helped. Her feet are just too attractive...)

"Wait, NOOOOOO!"

Squeezing out the last of his strength, Yuu twisted his body and narrowly escaped.

"Kyat! ♥"

"S-Saved..."

As Yuu regained his composure, he thought back to the perverted scene from moments ago and his face burned.

(Ugh, that was close... I’m terrified of the version of myself that was about to accept that perverted play...)

"Geez, Yuu-kun, that was dangerous. But more importantly..."

Yurika gave him a devilish look.

"Yuu-kun, you were seriously about to become my erotic slave, weren't you?"

Gulp!

"And also, weren't you about to go 『huff-huff』 on Onee-chan’s feet?"

"Uuuugh..."

Just when he thought she’d returned to being his kind sister, she attacked him with more embarrassing call-outs.

Whether she was Queen Yurika or his kind Onee-chan, she was still a pervert.

"Don't say 'huff-huff.' Where did you even learn words like that?"

"Ehhh~? It was in one of Yuu-kun's erotic books."

"Gaaah! Stop reading my books without permission!"

Yurika’s checking of his fetishes was so thorough that Yuu began to worry about his privacy.

"Nfufu... ♥ The battle is still ongoing, you know. All you have to do is keep enduring it, Yuu-kun~"

Yurika brought up the "battle" again. It was clearly a losing game for him. To keep resisting a sister as enchanting as a succubus required superhuman willpower.

"Oh, right. Yuu-kun, you like butts, don't you?"

"Huh?"

Yurika finally resorted to her trump card. A strategy to stimulate Yuu's "butt fetish."

"Look, Yuu-kun. It's the butt you love so much! ♥"

"Uwaaaaaah! Don't shove your tight-skirted ass at me!"

Kneeling on the bed, Yurika straddled Yuu backwards and presented her plump rear to him.

What's more, the tight skirt had hiked up, revealing her white underwear through the black stockings.

Yuu wasn't sure if he should point it out or keep quiet.

(Ugh! The pure white panties peeking out from the tight skirt and the thick black-stockinged thighs! Should I tell her I can see them? Or should I stay quiet? No, that's not the problem!)

A powerful wave of pleasure hit Yuu... down there.

"Hehe... I'm gonna attack Yuu-kun's naughty spot! ♥"

From who-knows-where, Yurika had produced a feather duster and was tickling Yuu's crotch with it.

"Tickle, tickle, tickle! ♥"

"Stooooooooooop!"

With Yurika's plump rear looming before him, the panty-flash from the hem of her skirt, and the tickling of his... area... Yuu was on the verge of collapse.

His youthful vitality was about to explode.

However, Yurika’s technique was beyond his imagination. Whenever Yuu was about to hit his limit, her feather duster would weaken, only to strike again once he’d cooled down. It was a level of "edging" cruelty that was purely demonic.

"Hehe... Yuu-kun... ♥ This is your punishment! ♥"

"Gyaaaaaah! I'm at my limit!"

The "out" level attack on his crotch, combined with the view of her rear and the panty-flash—the about-to-burst Yuu finally decided to call out her underwear.

"I can see it! I can see your panties!"

"Eh?"

Yurika hurriedly covered her rear and turned around, her face flushing deep red.

"Um... you saw?"

"It was a full view! It was practically on top of my face! And they were damp with sweat!"

"W-Wait, that wasn't sweat!"

"It wasn't?"

"It was... sweat...!"

Her face bright red, Yurika climbed off Yuu while keeping her hand over her rear.

She had finally realized how incredibly embarrassing her actions had been.

"P-Please forget what just happened. About you seeing it... and it being wet..."

As she unlocked Yuu's handcuffs, Yurika rubbed her thighs together shyly. Her eyes darted around as she tried to change the subject.

"S-So, Yuu-kun... Spring is gonna be fun, isn't it? It'll be just the two of us, forever and ever! ♥"

Watching Yurika's smile, Yuu understood the reality once again. From Spring, they would be all alone. Every day would be lovey-dovey and erotic.

"Aaaaaah! Dammit! How did it come to this!?"

"Fufu... ♥ I'll punish you again soon. Let's flirt forever, Yuu-kun! ♥"

There were literal hearts in Yurika’s eyes.

"I love you, Yuu-kun! ♥"

"I-I love you too. B-But... what are we gonna do...?"

Yuu's heart wouldn't stop pounding, and the tingling in his hips wouldn't go away. He loved Yurika so much he was at his absolute limit. He felt like he could cross the line at any moment.

They were siblings, they were teacher and student, and they weren't even officially dating yet... and yet, a life like a pair of newlyweds awaited them.

A life filled with love, flirting, and punishments with his intensely possessive step-sister.

《END》