My Taboo Academy

Dinner that night was pasta made by Yuna herself.

"Here, brother. Eat up."

"Thanks. Looks good."

It really was. The noodles were cooked just right, and the seasoning matched my taste perfectly.

Yuna turned out to be a surprisingly good cook.

The smell of garlic rose from the pan as she plated the rest.

"Mmm..."

I just nodded while chewing, too busy eating to answer properly.

"Brother, open up. Say ’ah’."

"Ah~"

I kept eating whatever she fed me without complaint.

Cleo watched the whole scene from the side with open disgust.

"What the hell is this? Why are you two talking like that?"

"Cleo, you too. Open up."

"...Since when did you two get so close?"

Even while complaining, Cleo reluctantly accepted the food Yuna held out.

Both of us stuffed our cheeks like hamsters, staring at Yuna while chewing.

"Um... since this morning?"

**Cough! Cough!**

I almost choked on everything in my mouth.

"Brother, eat slower."

Yuna handed me a glass of water with a bright smile.

...In some ways, she was scarier than Cleo.

Probably because we already shared secrets that went way beyond just glancing at underwear or taking pictures.

"...Something feels off."

Cold sweat ran down my back.

"Cleo, you opened up to brother a little today too, right?"

"Opened up? To who, exactly?"

"We’re all sitting here eating together, aren’t we?"

"That’s true, but..."

Cleo glared at me.

"The only difference is that the guy who used to lock himself in his room finally came out."

Ah. Right.

That shut-in role belonged to the old Ren.

Cleo had always been the confident one, so she probably ate with Yuna regularly.

From her point of view, the new me was just an uninvited guest crashing their peaceful family meal.

"No point staying locked up anymore. If I want to see Cleo’s panties, I’ll just ask her to show me."

"Who said I’m showing you anything?!"

"I already saw them today."

Startled, Cleo clamped her thighs together and glared daggers at me.

"No fighting at the table. Isn’t it nice that we’re all eating together?"

"Fine. Whatever."

"Besides, if a brother wants to see, a sister can at least show her panties, right?"

"That’s not how it works."

"What are you even saying? Have you lost it, Yuna?"

My timing with Cleo was perfect.

Yuna clapped her hands happily.

"Wow! Our chemistry is so good!"

"..."

"..."

We both shut our mouths at the exact same time. Reacting like Cleo when someone asks to see your underwear is normal. The scary part is thinking they might actually show it if you ask.

"Ah, brother. You have a mountain of laundry. Are you planning to wash all of it?"

"No. I’m throwing them away. I tried hydrogen peroxide and baking soda, but the stains won’t come out."

What the hell got on those clothes for the stains to be that stubborn? Still a mystery.

"School uniforms? It’s a waste to throw them away."

"They don’t fit anymore. I... grew a little overnight."

"Hmm... I can try altering them for you!"

"It’d be faster to just buy new ones. How much is a uniform?"

"Around 900 coins."

...

That would mean clearing about eighteen goblin hordes. I checked the balance on my student ID.

[Ren Asahi]

[Coins held: 54]

_Me and my broke ass can’t afford that right now_

If I kept showing up in improper clothes while trying to earn more coins, I’d probably get dragged back to the student council again.

My guilt hadn’t been wiped clean. The punishment was only suspended because of special circumstances.

Even a kid could figure it out if another incident happened in the meantime, the consequences would be much worse.

"Please, Yuna."

"Leave it to me, big brother! I’ll handle it."

"I’m heading up first."

Cleo put her dishes in the sink and went upstairs.

We both watched her leave.

"Do you think there’s any chance of making up with her?"

"Cleo gets lonely easily. If you keep reaching out, she’ll come around eventually."

"I can still hear you!" Cleo yelled from across the room.

If only she really would come around.

I hoped for some peace in this house...

Having two beautiful younger sisters who actually followed me willingly would be the best outcome.

A little later.

"Big brother... can we sleep together tonight?"

’This might be following me a little too well.’

At bedtime I stood in front of the door, my vision going a bit hazy as Yuna swayed her hips slightly.

["Fleshlight Aptitude Appraisal"]

[Yuna]

[Difficulty Level – None] [Fleshlight Aptitude S+ Rank]

[First Opponent is Older Brother] [Underwear – Black panties with minimal coverage. Yuna’s competitive underwear (no bra worn)]

[Fleshlight Traits – This younger sister has an incredible figure! A body balance with perfect volume, a devilish little sister’s Fleshlight that becomes irresistibly tight once experienced]

[A younger sister who adores and follows her brother. Beautiful, shy, and an exemplary student. At first she doesn’t give her body away easily, so the first step is difficult. However, once passion is ignited, she can’t stop her heart from being drawn to him.]

...I never wanted to know that my sister was a perfect hexagonal Fleshlight.

Dressed in a thin, almost see-through shirt with black lace underwear underneath, I had no idea where to look.

Yuna hugged her pillow tightly and looked up at me with slightly moist eyes.

This whole scene feels staged... is it just my imagination?

This is open seduction.

Or is it not?

Maybe my thoughts are just getting dirtier.

’...Would close siblings really share a bed?’

I need to think carefully. Ren Asahi.

But as an only child, I genuinely don’t know.

I thought back to holidays when I used to sleep in the same room as my cousins.

That didn’t help at all.

I can say for sure that the atmosphere back then was never this sexual.

My cousins looked like they were somewhere between monkeys and humans, so sleeping tangled up never made me think anything.

...But just the idea of sleeping next to Yuna...

"Brother... I’m scared to sleep alone."

I swallowed hard.

Her skin looked incredibly soft, still a little damp from her shower.

Yuna’s striking purple eyes glowed softly in the dim hallway, giving off a mysterious allure.

"Even now that you’re grown up, you’re still scared to sleep alone?"

"Yes."

"...Come in."

The moment I gave permission, Yuna jumped into my arms with a playful smile.

*Tightly!*

"Hehe!"

"You...!"

"Am I still a kid who’s scared of sleeping alone? Huh, brother?"

She’s not a kid, that’s the problem!

Wait... no bra?

I couldn’t stop myself from getting hard as Yuna pressed her breasts against me and even rubbed them a little.

She smiled alluringly, as if she knew exactly what she was doing.

No matter how much I tried to push her away, she wouldn’t let go.

Yuna kept rubbing her breasts against me while teasing.

"Mmm, brother, why do you keep stepping back?"

"C-Cleo might see..."

"Haha. It would be a total mess if Cleo found out you and I already had sex."

"...What sex?!"

It wasn’t sex!

"You said it was a mistake too."

"Brother, are you trying to run away from responsibility?"

"It’s not that. It was an accident! For the sake of your future husband too."

Yuna stood up straight and looked me in the eyes.

"...You already knew?"

"What...?"

"... the feeling when it fills me all the way to the root... the way I reacted when I clenched around it... the sense of becoming one."

"..."

"At that moment I felt like I had no choice but to become your woman... You made me swear it in my room, remember?"

Every word from Yuna made my head spin.

Is it really like that?

Is there no going back?

I felt my brain melting as she kept rubbing her breasts against me.

"Am I still a virgin, brother?"

"...Ah, ugh."

"Did you take me earlier... or not?"

"No."

I had to force myself to think that way.

Our relationship...

"But..."

I grabbed Yuna’s slender shoulders.

"Ah, brother?"

"If you don’t want it to stay a mistake, I’ll take full responsibility."

If that’s how Yuna feels...

Then I’m...

"Your brother, and your lover. Can I be your boyfriend?"

"..."

Yuna’s expression went blank, like she was intoxicated.

"...Then let’s go tell Cleo what happened between us."

That snapped her out of it immediately.

"Ah, no! Brother... I was just joking because it was funny watching you get flustered..."

"There are better things to joke about! Do you want to get scolded for real?"

Phew...

I let out a quiet sigh of relief.

It seems I’m still okay as her older brother.

"I’m sorry. I didn’t mean to act like I found a weak point..."

"It was a mistake... right?"

"Yes. No matter how you look at it, it was clearly an accident. Don’t feel guilty."

That’s true...

"...Was what you said earlier also a joke?"

"...What part?"

"The part about it reaching all the way to the root..."

Yuna only gave an awkward laugh.

...It must have been a joke.

There’s no way my dick has some evil effect like ’once a woman tastes it, she can never go back.’

Right? Goddess?

To Yuna’s future husband, she is still a complete maiden in both body and heart.

Please let it stay that way. The thought that I might have ruined her life makes me shudder.

"Now we can sleep together, right? Brother."

"...Huh? Is that how it works?"

"Yes. Everything’s settled. All that’s left is to sleep with my reliable big brother!"

"...???"

Is this really okay?

Yuna pulled me by the hand onto the bed.

Seeing how happy she looked... there shouldn’t be any problem... right?

After turning off the lights, the room went dark.

Feeling Yuna’s skin and body heat, we ended up tangled together.

She didn’t seem to mind my hard cock pressing against her at all. Instead she just snuggled closer into my arms.

"I’m glad you’re my brother."

"We haven’t known each other that long, though..."

"But I’ve known you for years."

Ah. Right. From Yuna’s perspective, that’s true.

"Brother. I like you."

This time it really felt like my brain was melting.

I didn’t think anything could be more unsettling than Cleo’s "Drop dead, brother."

After staying tangled together for a while, I gently brushed Yuna’s bangs and carefully asked,

"...Does that mean you like me as an older brother?"

My face burned with heat.

Why was I asking my little sister something like that?

What if she said she liked me as a man? Would I just touch her right away?

Yuna was already fast asleep in my arms, looking completely at ease.

’...’

I let out a long sigh.

We had settled on "older brother."

Yuna was just happy to have a big brother.

If I had taken it seriously and tried something, she would have reacted the same way she did when I grabbed her shoulders earlier.

So...

As a man, my job was not to touch her.

Even if Yuna gave me an opening as wide as the Pacific Ocean, I wouldn’t lay a finger on her.

’...This is the hardest thing I’ve done today.’

It was especially difficult with my cock still this hard.

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