[ENG] Onee-chan wa, kanojo de sensei de chō burakon Volume 1 Chapter 6

Chapter 6: The Day Onee-chan Spoils You Rotten

It was the start of a long weekend, and Mikiya and Emiko were preparing to set off on a hot spring trip for just the two of them.

In truth, Yuu and Yurika had been invited, but Yurika had declined, saying, "We're at the age where we shouldn't be tagging along on our parents' trips anymore." Of course, her real reason was that she wanted to spend the entire time they were gone flirting with Yuu.

Thus, Yuu and Yurika stood at the front door to see their parents off.

"Alright, we're heading out. We're leaving the house in your hands."

"It'll be fine. We didn't have any problems during your honeymoon, did we?"

Yurika waved with a smile, brushing off Mikiya's worried words. She acted as if there wasn't a single thing to be concerned about.

"Dear, Yurika is very reliable. Everything will be fine," Emiko added, clearly placing her full trust in Yurika.

To reassure Emiko even further, Yurika puffed out her chest and made a grand declaration.

"Mother, I will make sure Yuu-kun grows up to be a wholesome young man. I'll personally exterminate any 'bad bugs' that try to get near him."

Standing beside her, Yuu thought, (You're the least 'wholesome' one here, Onee-chan!)

"You're as dependable as always, Yurika. But don't overdo it, okay?"

"I know. Have a safe trip!"

And with that, the two of them departed for their hot spring vacation.

Thump! Click!

Yurika locked the front door and turned to Yuu with a radiant smile.

"Yuu-kun, what should we play? Onee-chan's Nurse Roleplay? A Hundred-Hit Punishment? Or maybe... some pro wrestling?"

The names were outrageous. No matter which one he chose, it was bound to be something intense.

"I mean, come on... what kind of options are those?"

Yuu complained, but in his heart, he was already excited to see where they would lead.

(Whoa! What are those? I'm interested in all of them!)

Yuu began imagining them one by one.

(Onee-chan's Nurse Roleplay... I guess she'd wear a nurse outfit and take 'kind' care of me? That sounds incredibly appealing!)

Then the second one.

(A Hundred-Hit Punishment... Is it really a hundred hits...? No, she wouldn't have the stamina. But... what if she actually has a hundred different kinds of punishment? Ugh, that makes it sound like I'm a total masochist!)

Ignoring his own masochism for a moment, he moved to the third.

(Pro wrestling... That’s the thing, right? Getting a wrestling move put on me by my sister—the dream play that every one of the 120 million little brothers in this country yearns for! Like the punishment move we did during the study session where her thighs were pressed against my face. If she put me in a Figure-Four Necklock with those beautiful legs...)

They were all so enticing he couldn't decide.

(Aggghhh! They're all way too erotic... wait, what am I thinking?! I'm always looking at my sacred sister with such lewd eyes!)

It was far too late for that, considering how many times he had used her for his "nightly activities" and how often he looked at her with pure lust. Moreover, he had completely forgotten how he used to say, "I'd never play wrestling with you!" Nowadays, he wanted nothing more than to grapple with his sister.

As Yuu agonized over the choice, Yurika spoke up, looking somewhat apologetic.

"U-um, sorry... I was just joking. I didn't think you'd take it so seriously..."

"Wait, what...? Joking...? H-haha..."

Yuu’s shoulders slumped in disappointment.

Shonnnnnnn...

With his excitement completely deflated and a dejected look on his face, Yuu retreated to his room.

Thud!

Inside his room, a wave of intense self-loathing washed over him.

"Gaaaah! I'm such a piece of trash!"

Back when they were kids, he had vowed to protect his precious sister. Once he became a man, he would confess his feelings to her. He wanted to treasure his beloved sister and make her happy for the rest of her life. That resolve hadn't wavered an inch.

Caught between his pure feelings and his lewd desires, Yuu was lost in a maze of love.

"Urgh... the source of the Demon God sleeping within me is about to go berserk!"

There was no point trying to mask his libido with chuunibyou talk. As he sat alone in his room, brooding, the sound of a knock from the person of his dreams echoed through the air.

Knock-knock!

"Yuu-kun, I'm coming in."

Click—

"Ta-da~! Yuu-kun, it’s time for your check-up! ♥"

"Wh—Whaaaaaaaaaaaaaa?!"

Yuu’s eyes nearly popped out of his head at the sight of Yurika. Her appearance left a powerful, indelible impression on him.

Yurika was in a nurse cosplay.

It was a tight pink one-piece dress, and it was incredibly short—the definition of a micro-mini. The thin fabric clung to her curves perfectly. Her chest was emphasized, and the view from her cinched waist to her pert, protruding backside was highly stimulating. She wore matching white tights and even a nurse’s cap—something rarely seen in modern hospitals. It was the ultimate nurse cosplay, a man’s dream brought to life.

"O-Onee-chan... why?"

"Yuu-kun, I'm sorry about earlier. The 'joke' part was actually the joke."

"Huh?"

In other words, Yurika had planned to play around from the start, but she had pretended it was a joke just to prank him.

"You looked so disappointed that I went and changed right away. I was going to do the sailor uniform, but I couldn't find one with good fabric online, so I went with the nurse instead."

As Yuu stood there stunned, Yurika struck a weird pose and delivered her catchphrase.

"If you aren't a good boy, I'll have to give you a biiiig injection!"

"S-so cute..."

The honest truth slipped out of Yuu's mouth.

"Eh? C-cu— ♥ T-thank you."

Fwoosh—

(Uuu~! Yuu-kun called me cute! I'm so happy! ♥)

Yurika, usually so aggressive, was completely flustered by Yuu’s compliment.

"Ahem! It’s a reward for working so hard on your studies and getting such good grades. Today is a day where you can spoil your Onee-chan as much as you want!"

"Wait, a reward?"

"I said... I'll do whatever you want today, Yuu-kun."

"Hmm?"

Yuu rubbed his chin, deep in thought.

(Wait, did she say 'whatever'...? W-w-w-w-w-w-whatever?!)

Yuu was thrown into a state of massive agitation.

(W-what should I do?! 'Whatever' means I could do that, or even this... Maybe an erotic pro wrestling move? O-or I could lock her in toy handcuffs so she can't move, and then use that feather duster punishment item...)

Yuu's delusions began.

Me: 『Look at this, Onee-chan! I'm gonna tickle your boobs!』

Onee-chan: 『Yuu-kun, nooooooo! ♥』

Me: 『Tickle-tickle-tickle-tickle! I'm not letting you off that easy!』

Onee-chan: 『Aaanh ♥ Yuu-kun, you're so mean! Please, forgive me!』

(S-s-s-something like that! Wait, what am I thinking?! S-sure, my sister is erotic and loves physical contact, but if I go full libido on her, she might end up hating me!)

His delusions entered a new maze.

(What if she says, 'Yuu-kun, you're just like every other guy—you're only after my body'? If that happens, I'll never recover!)

At the exact same time, Yurika was thinking along similar lines.

(Hehehe~ Yuu-kuuun ♥ I wonder what he’s gonna do to me? Maybe some erotic pro wrestling! Or, or... maybe he'll lock me in toy handcuffs and use that feather duster punishment item...)

Yurika's delusions began.

Yuu-kun: 『Look at this, Onee-chan! I'm gonna tickle your boobs!』

Me: 『Yuu-kun, nooooooo!』

Yuu-kun: 『Tickle-tickle-tickle-tickle! That’s enough for today.』

Me: 『Aaanh ♥ Yuu-kun, you're so mean! Please, do more!』

(S-s-s-something like that! Wait, what am I thinking?! S-sure, Yuu-kun is at that age where his libido is at its peak, but if I go full libido on him, he might end up hating me!)

Her delusions entered a maze of their own.

(What if Yuu-kun says, 'Onee-chan, you're a bit too vulgar. I think I prefer wholesome, innocent girls my own age after all'? If that happens, I'll never recover!)

Both of them were thinking the exact same thing, even if the details were slightly different.

After a long internal struggle, Yuu decided to do nothing.

"Um... I don't really have any requests, I guess..."

"Ehh?! You're not gonna do anything?!"

"Huh?"

"O-oh, I see. You aren't."

"Well..."

Despite having decided not to do anything, he already wanted to do everything. Yuu’s head was once again filled with thoughts of Yurika.

(Onee-chan... I actually want to. I want to hold you tight and give you lots of kisses. You're so close... I want to touch you. Your beautiful face, your soft-looking lips, your glossy hair, your slender fingers, your large breasts, your smooth legs—all of it! But...)

"Yuu-kun..."

Squeeze!

Yurika gently hugged Yuu.

"Oh..."

Her body heat transferred to him instantly, and Yuu felt the strength drain out of his body and soul.

"Yuu-kun, you can't usually spoil me because our parents are around. Today, at least, you can do whatever you like. You can spoil me as much as you want."

"S-Onee-chan..."

Yuu slowly wrapped his arms around Yurika’s back. He wanted to breathe in her scent until it filled his entire being. Just being in this embrace made him feel a happiness so profound he felt he needed nothing else in the world. He wanted to stay like this... stuck together forever.

"Yuu-kun... the day is still young, so let's flirt as much as we can."

Yuu listened to Yurika’s beautiful voice in a dreamlike state, feeling as if he were in heaven. He had no idea of the "Full-Course Erotic Sister" experience that was about to begin.

"Today, I'm going to be with you all day long."

Yurika gazed at him with a beaming smile. Bathed in that sun-like expression, Yuu continued to listen to her voice in a daze. He was enveloped by her soft body, feeling her comforting warmth against his chest. A sweet, intoxicating fragrance drifted from her silky hair.

It felt as if time had stopped. The noise from outside vanished, and it felt as if the world consisted of only the two of them. Yuu was filled with an incomparable sense of happiness.

(Oneeeee-chan! This is heaven! I want to stay in your arms forever...)

"There, there. I'll even give you some 'head pats'."

"Huh?"

"There, there... such a good boy~"

"Wait a second. Are you treating me like a kid?"

Yuu, despite his bliss, had a sudden doubt.

"Ehh? Adults get head pats too. It’s perfectly normal for lovers! ♥"

"Wait! L-Lovers...?"

"Ah! E-er... I mean, it's normal for siblings too."

Yurika had let the word slip and began to panic. she immediately corrected "lovers" to "siblings."

"I-I guess so...?"

"It is."

In Yurika’s mind, she already saw Yuu as her beloved boyfriend, even though no confession had taken place. She felt that a little bit of "premature flirting" was one of her sisterly privileges.

Meanwhile, Yuu’s heart skipped a beat at the word "lovers."

(S-S-S-Sis! Lovers?! D-does she actually think of me as... No, there's no way. I'm curious. She loves skinship and wants to flirt, but maybe she just dotes on me as her little brother...)

Yuu was tempted to just go with the flow, but he clenched his fists and held back.

(I love Onee-chan more than anyone else! I want to be her boyfriend! Once I'm an adult and I can take responsibility, once I'm a man worthy of her, I'll definitely confess. And then I'll tell her... that I love her.)

Yuu was determined to wait until he was an adult. Yurika, however, was ready whenever he was. In fact, she was more than ready to say "bring it on" right this second.

Stroke-stroke-stroke-stroke...

"Heeeeeehhhh..."

Yuu turned to jelly under Yurika’s "Head Pat Assault."

"Hey, you're petting me too much!"

"Yuu-kun, this is a medical procedure. Leave it to Nurse Sis."

"What...?"

Yuu gave her a look that said, Are you for real? He had never heard of a medical procedure that involved head pats. Yurika, however, looked confident.

"Hugging and petting someone secretes a neurotransmitter in the brain called oxytocin, which has a relaxing effect and reduces stress. It’s good for your health."

Faced with a technical explanation, a skeptical Yuu found himself convinced.

"I see. I didn't know that."

"That’s why you have to give Nurse Onee-chan your absolute obedience."

"O-okay..."

Before he knew it, Yuu had been forced into absolute submission. Perhaps Yurika really did have a "Queen" streak after all. She wanted him to be completely submissive so she could do all sorts of things to him.

"Haaahhh~ ♥ Yuu-kun! ♥ Squeeze~"

"Guh!"

Yurika pressed her soft, plump breasts against his face, and Yuu’s head was buried in her cleavage. The front zipper of her nurse cosplay began to slide down under the sheer pressure of her chest, threatening to reveal a deep valley.

(T-T-T-T-The boobs! Onee-chan! You call this a 'relaxing effect' from oxytocin, but this is 'Boob-itocin'! I'm getting too excited to relax at all!!)

Rather than relaxing, Yuu was stiff as a board. If this kept up, he was going to hit his limit. He suddenly came up with a plan to pet his sister back.

"S-Onee-chan. I'll give you some head pats too."

"Eh?"

Yuu removed her nurse’s cap and began petting her head.

Stroke-stroke-stroke-stroke...

"Hauuh ♥ Y-Y-Y-Yuu-kun! Wawa, n-no ♥ Ahn ♥"

With just a few pets, Yurika’s face turned bright red and she turned to mush. While her offensive power was overwhelming, her defensive stats were apparently pathetic. Under Yuu’s unexpected counterattack, Yurika was at his mercy. Instead of making him submit, she looked like she was the one about to surrender.

(Yuu-kun... suddenly being so proactive... Uuuuh ♥ If you do that, your Onee-chan is going to lose her mind! ♥)

Yurika’s feelings for Yuu were too strong. Just a little petting was enough to send her over the edge. Her "downstairs" was already aching with desire.

"Y-Yuu-kun! Lewd things are forbidden!"

Yurika issued a "Lewdness Ban." She seemed to have forgotten that she was the one being lewd.

"Ehh? Aren't you the one being lewd, Onee-chan?"

"No. Lewdness is forbidden."

The two of them pulled apart slightly and fell into silence, though they kept their hands joined as if reluctant to let go. To anyone else, they looked like a pair of lovers deeply in love.

Yuu suddenly felt a wave of embarrassment wash over him.

(Wait, wait, wait! Was I just being pampered by my sister’s boobs? I'm going too far just because our parents aren't here. We're alone until tomorrow night—if this keeps up, something bad is gonna happen...)

Feeling the danger, Yuu shook his head to clear away the impure thoughts.

(Okay, I need to calm down so I don't get swept away into doing something lewd. I know, I'll do something for Sis to show my gratitude for everything she does for me.)

Meanwhile, Yurika’s body was flushed and her heart was racing. Her "switch" had been flipped completely.

(W-w-w-what am I going to do?! The depths of my body are aching and I can't stop it! Should I just run back to my room and use Yuu-kun as 'material' for something naughty?)

Yurika tried to brush away her desires, but it only made her delusions worse.

(But if I do that, maybe I should have Yuu-kun 'massage' me and have him squeeze my boobs or my 'there'... Wait, that’s totally out of bounds!)

(Note: It was, in fact, totally out of bounds.)

As Yurika indulged in her "out of bounds" fantasies, Yuu spoke up with a nervous expression.

"S-Onee-chan... you're always helping me with my studies and taking care of me, so today I'm going to 'serve' you."

Yuu tried to get Yurika to lie down so he could give her a massage.

"Eh? Eh? Yuu-kun?"

He felt like he would hit his limit if he just kept letting her pamper him. He was likely trying to calm himself down by doing something for her instead.

"Come on, lie down."

"Wait, what? Yuu-kun?"

Without really understanding what was happening, Yurika lay down, her sensitive body trembling. It felt as if the erotic massage she had just imagined was becoming a reality.

"Okay, here I go."

"Hauuh ♥"

Thump ♥ Thump ♥ Thump ♥

Being touched by her beloved Yuu while her "switch" was on, Yurika almost lost consciousness from the sheer pleasure.

"How is it? Does it feel good?"

"Y-yes... Hah ♥ Y-yeah. It... feels good... ♥"

Yurika, usually the one on the offensive, was completely defenseless against Yuu’s unconscious assault today. Waves of pleasure surged through her entire body, leaving her unable to resist.

(Haaah, ahhh ♥ Yuu-kun... I might be done for ♥ This is... this is the really bad kind of good! It’s coming!)

Yuu, unaware that Yurika was on the verge of peaking, continued to massage her with all his might.

Squeeze-squeeze-squeeze-squeeze...

First the shoulders, then the back. Because her nurse cosplay was so thin, the lines of her underwear were faintly visible. Perhaps because she was sweating slightly, the fabric clung to her skin, making it look even more erotic. Yuu averted his eyes from the bra lines on her back and focused on the massage.

Squeeze-squeeze-squeeze-squeeze...

"Ah ♥ Mmmh ♥ Ngh ♥ Ahn ♥ Haaaah... ahhh... ♥"

Oblivious to the strange sounds Yurika was making, Yuu continued his focused massage. After finishing her shoulders and back, he moved his hands down to her waist. The moment his hands touched Yurika’s slender, trembling waist...

A massive wave crashed over her.

"Nhoooooooooo ♥ Hic ♥ Ahhh... ah... ♥"

Yurika’s body gave a violent jolt, and her large, rounded backside began to convulse with tremors.

"Oh, sorry! Did that hurt?"

"N-no... Ahh ♥ I'm... okay."

"Maybe I should stop with the waist? Then... I'll do your legs..."

Yuu reached for Yurika’s thighs.

"Wait... Onee-chan... your thighs are soaking wet with sweat."

The area near the tops of Yurika’s legs peeking out from the mini-dress was soaking wet with a fluid that looked like sweat.

"N-no, that... that’s..."

Yurika summoned the last of her strength to sit up.

"Y-Yuu-kun... Ahn ♥ S-Onee-chan... got a bit sweaty... Ngh ♥ I'm... gonna go take... a shower... ♥"

Drenched in "sweat," with messy hair clinging to her forehead, Yurika was radiating an unbelievable level of sex appeal. Her thin nurse outfit was also soaked, becoming almost transparent enough to see her underwear.

"Wh—Wait..."

Yuu’s eyes widened as he looked at her. His sister’s face, covered in sweat, was the most beautiful thing he had ever seen.

"Onee-chan, are you okay?"

"I'm-I'm fine, I'm fine..."

Yurika, her speech becoming somewhat disjointed, dragged her exhausted body toward the bathroom. Yuu watched her retreating figure with a worried expression.

Slide!

Reaching the bathroom, Yurika collapsed onto the tiled floor and looked up at the ceiling.

"Aggghhhhh! Yuu-kun made me peak with his own hands! I can't believe I ended up like that from just a massage! My sisterly dignity is gone!!"

Whether she had any dignity left was debatable, but Yurika wasn't the type to let her brother have the last laugh. She vowed in her heart to strike back with a "comeback of a lifetime"—no, a hundred of them.

And of course, it goes without saying that she used the sound of the shower to drown out the noise as she did something incredibly "naughty" to herself.

◆ ◇ ◆

The tension is really ramping up now that they're alone! Would you like me to continue with the next part of their "one-day-only" flirting session?

When Yurika finally emerged from the bathroom, she seemed to have completely recovered her composure. For some reason, her complexion was glowing, and her skin looked radiant.

“Yuu-kun, sorry for the wait~!”

Even in her post-bath state, Yurika was dangerously provocative. She was wearing a casual T-shirt and a pair of thin, skin-tight short-shorts. It was just simple loungewear, yet on Yurika, the destructive power of the outfit was staggering.

“Onee-chan, you were in the shower for a really long time. I actually went to check on the bathroom because I was getting worried.”

Yuu’s words made Yurika flinch with visible agitation.

“Wha—?! Wh-When?!”

“A little bit ago.”

Worried when Yurika didn’t return, Yuu had gone to see if she was okay.

“Hold on, hold on, hold on! Did I... did I say anything?!”

Yurika couldn’t hide her panic.

And for good reason. If he found out she’d been doing something naughty in secret, her dignity as a Onee-chan would be flushed down the drain. It was beyond embarrassing.

(Crap, crap, crap! This is bad! I was totally in the bath, imagining Yuu-kun while I was [Self-Censored]! Did he hear me? Did he actually hear me?!)

Oblivious to Yurika’s internal meltdown, Yuu remained completely unaware.

“The sound of the shower made it hard to hear, but I caught you saying my name over and over. I figured you were just being your usual self, so I came back here.”

Yurika had been screaming his name while fantasizing about having sex with him, but since she was constantly chanting “Yuu-kun, Yuu-kun, Yuu-kun” anyway, Yuu didn't find her "usual operations" suspicious.

In a twist of fate, her daily perversions had actually worked in her favor.

“O-Oh, I see. I guess I was just so excited to be with Yuu-kun that my energy levels spiked.”

(He didn’t realize. He hasn’t realized, right? If he found out I was doing something forbidden in the bath, I’d literally die of shame! Plus, it would be terrible for Yuu-kun’s moral development.)

Completely ignoring her own constant lewd behavior, Yurika worried about Yuu’s "upbringing."

“Well, that’s a relief. You were acting so strange earlier, I was worried.”

“T-That was just... because your massage was so good, Yuu-kun! It made my whole body feel all hot!”

“I-I see... Haha.”

In truth, Yuu was also feeling a bit shaken.

When he had gone to check on her, he’d spotted Yurika’s nurse uniform and underwear in the laundry basket, soaked through with sweat. In that moment, an uncontrollable, primal urge had surged within him.

Images of the classic "sniff-sniffing" scenes from anime and manga flashed through his mind, and he’d fought a desperate battle against the temptation to pick them up.

He’d wanted nothing more than to press his sister’s underwear against his face and do something indecent while taking in her scent.

He’d managed to pull himself back from the brink at the last second and return to the room without doing anything, but...

(She didn't notice, did she? If she found out I was in the changing room, secretly trying to sniff her clothes while I [Self-Censored], I’d die of embarrassment. Not to mention, it’s so disrespectful to Onee-chan. She’d probably despise me.)

Truly, this pair of siblings were two peas in a pod. Their love was spiraling out of control.

“A-Anyway, Yuu-kun, you must be hungry. Shall we have some lunch?”

“Yeah, sounds good.”

Realizing they were both drowning in unhealthy, erotic delusions, they decided to settle down with a meal.

◆ ◇ ◆

The two of them stood in the kitchen, shoulder to shoulder, preparing the food. They made for a heart-warming sight.

“Yuu-kun, I can handle the cooking. You’re welcome to just sit and wait.”

“I want to help. I want to make this with you, Onee-chan.”

Thump ♥

Yuu’s earnest attitude made Yurika’s heart skip a beat.

“Yuu-kun ♥ You’re such a good boy.”

“Stop treating me like a kid.”

“Hehe, even that part of you is cute.”

With their parents gone, she was being ten times more affectionate than usual today.

“Oh, Yuu-kun. When you use the knife, remember to keep your hand like a cat’s paw. Like this, see—?”

Yurika reached around from behind Yuu, gently taking his hand to guide him. As she did, she pressed her ample cleavage firmly against his back.

Feeling his sister’s soft curves against him, Yuu’s face turned bright red in an instant.

“I—I know how to do it. I can manage on my own.”

“No, no. It’s dangerous.”

(Onee-chan... you’re way too close. This is too much stimulation. How can she be so defenseless...?)

Yuu worried about his overly vulnerable sister. He felt like he had to be the one to protect her.

“Yuu-kun ♥ Doing this makes us feel like newlyweds, doesn’t it?”

“H-Huh? N-Newlyweds...?”

(Is she doing this unconsciously? She’s been saying all these suggestive things about being lovers or newlyweds... Marriage with Onee-chan... A happy life as husband and wife... It would be heaven.)

Yuu’s fantasies began to swell.

In the future, he wanted to marry his beloved Yurika, flirt with her every single day, and build a happy home.

...Though, truthfully, they were already flirting plenty right now.

『Thanks for the food!』

They sat side by side, eating the meal they’d prepared together.

Usually, the table was set for four, but today it was just the two of them.

“Um, Onee-chan... aren’t you a bit close?”

Yurika was always one to ignore personal space, but today she was closer than ever. Their chairs were pushed right against each other, and she was practically sitting in his lap.

“I told you, today is a day where you can spoil me as much as you want.”

“Isn’t it more like you just want to be spoiled?”

“Th-That’s one thing, and this is another! A little brother should be honest and lean on his Onee-chan.”

With that, she pressed even closer.

She wrapped her arms around Yuu from behind, effectively putting him in a back-hug.

“Um, Onee-chan... I can't eat like this.”

“I-It’s fine. I’ll feed you.”

Still hugging him from behind, Yurika picked up some food with her chopsticks and brought it to Yuu’s lips.

It was like some kind of acrobatic party trick.

“Here, Yuu-kun. Say 'ahh' ♥”

“Wait, I’ve never heard of an 'ahh' like this...”

Even as a fan of erotic "sister-complex" manga, Yuu found himself thinking, I’ve never seen this specific variation of the trope before. His perverted sister’s creativity was truly bottomless.

“Goodness! I’m the one saying 'ahh,' so you’d better eat up. A younger brother owes absolute obedience to his older sister!”

Despite having nearly surrendered to Yuu’s "massage" earlier—where she was the one on the verge of total obedience—Yurika was back at it again, trying to assert her dominance.

At this point, it felt less like she was trying to show her authority and more like she just wanted an excuse to flirt.

“There’s no such rule—u-urk?!”

The moment Yuu tried to complain, Yurika’s left hand slid down toward his lower abdomen.

“Yuu-kun, if you can’t listen to your sister...”

“U-Understood! I’ll eat! I’ll gladly eat!”

Her hand was only inches away from touching his already-energetic "little Yuu-kun."

Realizing that further resistance would only increase his erotic sister’s attack power, Yuu decided to submissively accept the "ahh."

“Here, 'ahh' ♥”

“Ahh... munch munch.”

“Well? Is it tasty?”

“Y-Yeah...”

To be honest, Yuu was so distracted by the softness of Yurika’s body pressed against him that he couldn't even taste the food.

(M-My god, her breasts... Seriously, Onee-chan is way too oblivious. Anyone would get the wrong idea from this. This is the kind of 'play' only couples do.)

A hypothesis suddenly crossed Yuu’s mind.

(Wait! Does Onee-chan... maybe feel that way about me? You wouldn't do this with anyone except someone you love... but...)

Even with a "age equals years without a girlfriend" record, Yuu figured that this level of lovey-dovey play was reserved for someone special.

However, Yurika was already demanding even more advanced maneuvers.

“Okay, Yuu-kun, it’s your turn. Feed me now.”

“Wh-Whaaa?! I have to do it too?!”

“Of course. Returning the favor is mandatory.”

Yurika pulled away for a moment and turned her back to him. When she swept her hair up, her pale nape was exposed.

Her skin was fine and moist, and the faint outline of her bra strap was visible through her shirt. It was agonizingly sexy.

To perform the same acrobatic "ahh," he would have to cling to that alluring back right now.

Gulp!

Yuu swallowed hard.

They’d been flirting since the morning, and he was already reaching his limit.

(Onee-chan’s back... it’s so beautiful. She’s gorgeous from every angle. And now I have to hug her from behind?)

Yuu realized he’d made a mistake. If things were going to get this erotic, he should have "taken care of business" in secret while she was in the shower.

“Come on, hurry up ♥ The food’s gonna get cold.”

“O-Okay.”

Finally summoning his courage, Yuu embraced Yurika’s back.

Squeeze!

As they pressed together, he could feel her body heat. It felt as though their very heartbeats were syncing up as their bodies overlapped.

Yurika’s beautiful hair and nape were right in front of him. They were close enough to kiss.

(Uuuugh, this is torture! I just want to kiss her neck right now. I want to nibble it and lick it...)

Yuu, pushed to his absolute limit, gripped the chopsticks with a trembling hand.

“Here, Onee-chan. 'Ahh'.”

“Mmm ♥ 'Ahh'...”

Yurika had been eating in silence, but when she turned around, her face was bright red with embarrassment. Even though she was the one who had demanded it.

“Uuu... it’s so embarrassing ♥”

Despite her fidgeting and blushing, the moment it was her turn to go on the offensive again, she was all for it.

“Okay, okay! It’s Onee-chan’s turn again ♥”

“Wha—we’re still doing this?”

“We’re doing it until we finish the food!”

“You’ve got to be kidding me...”

They swapped positions once more.

But this time, it wasn't just a back-hug. Yurika wrapped her legs around Yuu’s waist.

It was the position commonly known as the 《I-Love-You Hold》, but in reverse. A "Back-Hug I-Love-You Hold," if you will.

“What in the world is this?!”

It was an even more perverted and acrobatic technique.

Furthermore, Yurika’s crossed legs were rubbing directly against Yuu’s crotch. If he didn't finish eating soon, her feet were going to make him cross the point of no return.

“Haaah... Yuu-kun... Yuu-kun... Yuu-kuuuun ♥”

“Gah! Just feed me already!”

It was now a life-or-death struggle: would he finish the meal first, or would he "explode"?

From an outsider’s perspective, they looked like a total "stupid couple," but they were far beyond noticing that.

They certainly couldn't show this to their parents, or any acquaintances, or even a stranger.

The "No Eroticism" ban had been tossed out the window as their "Newlywed Play" continued.

“Huff... huff... huff... That was dangerous.”

Yuu had barely managed to endure the urge to cross the finish line.

It was a secret that he’d almost "misfired" halfway through. Whether it was accidental or not, Yurika’s feet had slipped between his legs and had been grinding against him.

It was a battle of siblings that drained their mental, physical, and sexual energy—all just to eat lunch. It made no sense.

Yuu felt like he deserved a medal.

(Ugh... I’m exhausted just from eating. I was pushed to the brink of 'firing' and then teased... what kind of training is this?)

“Yuu-kun, time for the next 'ahh' ♥”

However, Yurika was already desiring a new variation. Her "sister-power" was truly bottomless.

“Next, we’re doing a front-facing cuddle ♥”

“Huh?”

Having tasted the thrill of the Back-Hug I-Love-You Hold, Yurika finally demanded a standard I-Love-You Hold for the third round.

She wanted to feed him while they were holding each other and staring into each other's eyes.

“Come on, bring your hips closer ♥”

“Wait, wait, wait! This is definitely going too far!”

Yurika wrapped her legs around his waist. From the side, anyone would have sworn they were "connected."

“Eek!”

Finally realizing just how "out" this was, Yurika got too excited and nearly tumbled off the chair.

Having decided that the 《I-Love-You Hold》 on a chair was too dangerous, they switched back to normal "ahhs" for the fourth round.

“Uh, is this gonna go on forever?”

Yuu couldn't help but feel a chill of dread. If his sister was this out of control during the day, what would happen when night fell?

After lunch, the two spent a relaxing afternoon in the living room watching TV.

They sat on the sofa, huddled close together.

“Haaah ♥ Yuu-kuuuun.”

“Hey, you’re sticking to me too much.”

They were supposed to be sitting side by side, but before he knew it, Yurika had leaned into him so much that she was now fully clinging to him.

Even on the sofa, they were displaying their "Super Stupid Couple" energy.

“We’re siblings, so this is normal ♥”

“It is not normal!”

“They did it all the time in those manga you have, Yuu-kun.”

Twitch!

When the topic of his erotic "sister-complex" manga collection came up, Yuu had no defense.

It was true that in his favorite manga, siblings flirted like this as if it were perfectly natural.

(D-Damn it! Did she check my collection again?! Now my fetishes are totally exposed!)

...Actually, they’d been exposed for a long time.

“Geez, Yuu-kun... do you really hate skinship with your Onee-chan?”

Looking up at him with those upturned eyes, there was no way he could say he hated it.

“Urgh... I—I don’t hate it...”

“Hehe, Yuu-kun, you perv ♥”

“Guh...”

Yurika wore a smug, lewd grin.

Was she still holding a grudge for when he counter-attacked and made her surrender earlier?

“Yuu-kuuuun ♥ Mwah ♥ Mwah ♥”

She began kissing him from his neck down to his collarbone.

Since he’d agreed that anywhere other than the lips was okay, she was liable to kiss him anywhere on his body.

There was a real risk she might aim for the dangerous, "Self-Censored" zones.

“S-Stop it.”

“I won’t stop! If Yuu-kun won’t give me some skinship, I’m gonna give you loooooots of kisses all over your body!”

On the TV, a news program was discussing current affairs.

Yuu was far too distracted by his sister’s aggressive affection to pay attention, but Yurika suddenly smiled as if she’d had a brilliant idea.

“Yuu-kun, sudden pop quiz!”

“Huh?”

“In the Separation of Powers, there is the Legislative, the Executive, and the...?”

“Th-The Judicial!”

“...However!”

“Hey, that’s cheating!”

Apparently, the question wasn't over.

“The Diet designates the Prime Minister to the Cabinet, and the Cabinet dissolves the House of Representatives in relation to the Diet. Now, what can the Diet do in relation to the Courts?”

Yuu panicked at the sudden quiz.

“Uh, ummm...”

“Three, two, one, zero! Bzzzzt! The answer was: Setting up an Impeachment Court! Okay, punishment time!”

Yuu was pushed down onto the sofa, and Yurika’s plump backside began to descend toward him.

The punishment was an “Oshiri-oki”—a "Butt-Placement."

“Wait, wait, wait! That’s my face! That’s my face right there!”

For some reason, Yurika’s large rear was coming down right onto Yuu’s face. Her thin short-shorts were stretched tight, showing the faint outline of her underwear.

At this rate, Yuu’s face was going to be buried in her butt.

“Hold on! Not there!”

“Ehehe ♥ Just kidding~ ♥”

Right before his face was smothered, Yurika stopped her playful teasing.

Yuu had a suspicion she’d been trying to "Face-Sit" him while pretending it was an accident.

“Oh, alright. I’ll do it on your stomach instead.”

Yurika sat down on Yuu’s belly. With the full weight of her rear pressed against him, Yuu was completely pinned.

“Ugh... you’re heavy!”

“Hah? Yuu-kun, did you just say I’m heavy?”

Yurika’s eyes narrowed dangerously.

“I—I—I didn’t say that!”

“And?”

“O-Onee-chan is light as a feather!”

“That’s what I thought~”

She’d forced him to say it. Yurika was very sensitive about the word "heavy."

While she had a spectacular figure like a gravure idol, she was also reasonably tall and had curves in all the right places—big breasts and a thick ass. Naturally, she had some weight to her.

Satisfied after making Yuu call her light, Yurika continued her quiz while remaining seated on his stomach.

“I’m going to keep asking questions, and if you get them wrong, it’s a punishment. If you get them right, I’ll give you a reward.”

“What? Why all of a sudden?”

It didn't matter why. Yurika just wanted an excuse to punish him.

Though, for Yurika, both the punishment and the reward were beneficial. She was ready for anything, whether giving or receiving.

“You say reward, but I bet both options are basically punishments, aren't they?”

Yuu complained, but his heart wouldn't stop racing from the pressure of the soft, thick backside resting on his stomach.

“Hmm, let's see... Oh, I know! If Yuu-kun gets one right, you can kiss Onee-chan anywhere you like.”

“A—A—A—A kiss?!”

Yuu’s excitement skyrocketed.

(A kiss with Onee-chan!)

(No, wait! Kisses are for after you start dating! I have to keep our relationship pure until I confess and we’re official! Argh, but I want to kiss her! Anywhere I want...)

Gulp!

Yuu’s gaze landed on Yurika’s chest. Then his eyes drifted down toward her hips and thighs.

“Yu—Yu—Yuu-kun! No! That’s a no-no! Nothing erotic allowed!”

“I haven't even said anything yet!”

“But you had such a lecherous look in your eyes just now! Jeez, Yuu-kun, you perv! Lewdie! Hentai!”

Despite being a "perverted sister" who did nothing but lewd things herself, she’d banned her brother from being erotic.

She was a bit of an irrational sister.

When she was the one attacking, her reason stayed intact, but if her beloved Yuu were to launch an erotic counter-offensive, she wouldn't be able to handle it. She’d likely cross the final line immediately.

After all, just having her head patted or her body massaged was enough to make her react uncontrollably.

She’d spent so much time tempting him to make a move, yet now she was suddenly acting timid and banning eroticism.

She said she was "ready for anything," but that was a lie.

The "Invincible, Unbeaten, Strongest Onee-chan on Earth" was actually a total pushover when it came to defense.

(Geez, Yuu-kun... I bet you were totally planning to kiss me somewhere naughty, weren’t you?)

Yurika’s delusions accelerated.

(W-What if he kissed my n-nipples or my v-v-vagina?! That would be way too lewd! Wh-Wh-Wh-What should I doooo?!)

Yuu hadn't even considered kissing her nipples or her crotch, but Yurika was off in her own world of erotic fantasies.

“Ahem... Anyway, I said today is a day where you can spoil me, but anything 'dirty' or 'naughty' like chome-chome or whatever is strictly prohibited!”

“I—I wouldn't do that!”

Yuu was actually a bit put off by the fact that she’d used terms like "chome-chome," which were basically code for adult-rated activities.

He was starting to get worried about just how perverted his sister was.

“What are you even saying...? I was just gonna kiss your cheek.”

“O-Oh, right. A kiss on the cheek. Of course.”

While Yurika was busy imagining a hardcore erotic scenario, Yuu was being perfectly wholesome.

And so, the "Onee-chan Quiz" began.

Yuu got several questions wrong in a row.

It was quite immature of Yurika to ask nothing but trick questions and unfair ones.

As a result, Yuu was subjected to one "erotic punishment" after another.

Currently, he was caught in something like a wrestling submission hold, tangled up and squeezed between her smooth, thick thighs.

“Gwaaargh! Give! Give!”

“Give me?”

“I'm giving up!!”

In the end, it seemed Yurika was following through on all the things she’d mentioned that morning: the "Nurse Play," the "Hundred-Round Punishment," and "Pro-Wrestling Play."

You could search the whole world and never find a sister as generous as Yurika.

“Okay, final question. Which Japanese prefecture has the largest land area?”

“Huh?”

The final question was an incredibly easy "service" question.

Yuu became suspicious.

(Wait... is this a trick? Is it really just a freebie?)

“...Hokkaido.”

“Ding-dong, ding-dong!”

Teaching him while giving him erotic punishments, only to end with an easy question and a reward... Onee-chan-sensei was actually very kind.

“Okay, you can kiss Onee-chan’s cheek now.”

“U-Um, okay...”

Yuu grabbed Yurika’s shoulders and leaned in.

(Onee-chan’s face... it’s so beautiful. Her skin is so white and fine... her big eyes, her long lashes... even the shape of her lips is lovely and looks so soft... I just want to pull her into my arms right now and tell her I love her. I want to confess that I love her more than anyone else. I want to ask her to be my girlfriend.)

Yuu stopped, frozen while staring at Yurika.

Meanwhile, Yurika, being stared at by a Yuu with such a serious expression, couldn't hide her agitation, which was a mix of anticipation and anxiety.

(Wait, Yuu-kun...? What’s wrong? C-Could it be that he can't hold back anymore?! I-It’s still too early! I mean, I want to do it so badly I’m at my limit too, but I’m not mentally prepared... Also, I don’t have any of 'those' ready...)

Yuu was on the verge of an impulsive confession, while Yurika was already jumping ahead to the act itself and worrying about not having any 0.01mm latex protection on hand.

Their hearts were overflowing with uncontrollable feelings, and both were about to take a forbidden step.

Thump, thump, thump...

A food-tour program was playing on the TV. The sound didn't even reach the two of them as they stared at each other in the living room.

They could only hear each other's heartbeats; they could only see each other.

It was as if they were in a completely isolated space, just for the two of them.

Inside Yuu, his feelings for Yurika were pouring out.

(Onee-chan! Onee-chan! Onee-chan! I love you! So much I can't stop it! But Onee-chan is the most important thing to me...)

Yuu thought. If he let his desires explode here and now, he might destroy Yurika’s future.

(I don’t care how much it hurts! I don’t care how painful it is! As long as Onee-chan is happy! So... I have to wait just a little longer, until I can take responsibility for her.)

Yuu exercised a level of restraint that was almost nauseating, holding back his confession.

At this point, his self-control was bordering on masochism.

Suppressing the urge to hug her tightly, he kept his hands gently on her shoulders and leaned in.

He would just give her a light kiss on the cheek and end the reward there.

(I can live on just that. As long as I have my beloved Onee-chan, I can endure anything.)

As Yuu drew closer, Yurika’s eyes shimmered, slightly moist. They were deep, beautiful eyes full of affection.

Yurika closed her eyes, which were beautiful enough to be sucked into, lifted her chin slightly, and puckered her lips.

In other words, she made a "kiss face."

Yuu was utterly shaken by this sudden invitation.

(Wha—wha—wha—what?! O-Onee-chan! Why are you making a kiss face?! What am I supposed to do with this?!)

Yuu had fought through blood and tears to restrain himself, but Yurika’s "kiss-ready" face was about to shatter his resolve.

On the other hand, Yurika, who had been shouting about "No Eroticism" earlier, had completely melted into a puddle of desire now that it was actually happening.

(Ahhh... Yuu-kun... I can’t do it anymore... I’ve tried to hold back, but I think I’ve reached my limit... I don’t care if I go to hell as a wicked sister who committed a taboo...)

Yurika had made up her mind.

(It can’t be helped, right? I love him so much... But I want to protect Yuu-kun at least. If we ever get caught, I’ll take all the blame.)

Was this unconditional love? She was willing to throw everything away to live for love.

...Though, in her head, she’d completely forgotten about the 0.01mm protection.

Grab!

Yuu suddenly pulled Yurika into a tight embrace.

“...I do.”

“Huh?”

Mwah!

Yuu whispered something very softly into Yurika’s ear... and then kissed her on the cheek, not her lips.

For a moment, Yurika didn't understand what had happened. She stared at Yuu until she finally came to her senses.

“Wh—? Yuu-kun...? What did you just say?”