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Perhaps it was because Serena\'s body was soft and warm.

Rub, rub.

"Mmm…"

As I buried my nose in the nape of Serena\'s neck, inhaling her damp scent, my cock grew even harder.

My hips moved naturally, undulating like waves, as I rubbed my erect dick against Serena\'s soft buttocks.

Rub, rub.

Such a luxurious dakimakura. Sigh.

…Dakimakura?

\'Gasp.\'

Awakening to the realization of what I was doing in my sleep, my eyes snapped open.

Serena, trapped in my arms, was unable to move.

As an older brother, I was shamelessly rubbing my cock against my little sister\'s ample ass, savoring the sensation!

"Serena, are you awake?"

If, by chance, Serena had noticed my vulgar cock-rubbing moment…

"…"

Her breaths scattered.

Without looking back at me, Serena\'s ears turned a deep shade of red.

\'…I\'m doomed.\'

We were like newlyweds. Just moments ago, as if indulging in the scent of his wife\'s body, I breathed in Serena\'s intoxicating aroma and rubbed my cock against her ass. The sensation was unforgettable, and my pre-cum continued to flow.

"So, that\'s why…"

Embarrassed, I murmured.

"…I should go to my room and sleep… that\'s what I should have done."

"...."

I felt a pang of guilt, as if I were blaming Serena. After all, I was the one who had embraced her and rubbed against her in the first place!

\'But, even if I were awake…\'

How could I control myself while sleeping? Serena was soft, her entire body smelled divine, and she was warm. Even now, the distance between us was not that great.

"…Do you want me to do it, big brother?"

What, what should you do?

"It\'s very late today, and my wrists are tired, so I\'ll do it again next time! Big brother."

That?

A handjob?

My cock throbbed as if it hadn\'t forgotten Serena\'s touch, on the verge of bursting. It was already fully erect, but any man would know the difference.

The fact that a man can experience erections beyond full arousal.

Serena still doesn\'t turn to look at me. She continues to speak with her back turned, seemingly shy.

"Because I agreed to do it…"

"So…"

Hurry.

Rebuke the nonsense and send her off to her room!

A small voice of reason inside me was screaming,

but Serena\'s alluring voice, filled with 50% teasing and asking \'Should I do it?\', had already taken over most of my brain.

Serena\'s handjob.

It\'s not sex, so maybe it\'s okay.

\'No, there\'s no way it can be okay.\'

At that time, I must have been momentarily out of my mind, allowing my sister to give me a handjob.

Serena, caught up in the moment, ended up indulging my lascivious desires. If I don\'t draw a line here, this behavior will only escalate further!

Yes.

I can take care of myself later. Let\'s quickly get her out of my bed.

"Do you want to put it in here?"

The moment Serena slightly pushed her hips back while opening the gap between her thighs,

I clung onto her like a monkey and inserted my cock.

\'Huh?\'

"Kyaa…"

Serena tightens her thighs, and my cock is drawn into the alluring flesh of her enticing thighs. It\'s locked in tightly.

"Ah, huh…"

As a moan escapes my mouth, the grip of Serena\'s thighs tightens even more.

"Do you like your sister\'s thighs?"

Yes! Incredible!

I can\'t bring myself to say it out loud, but I tremble with a mix of shame and pleasure as I move my hips. Serena, lying on her back, gently tilts her pelvis from side to side, causing her thighs to quiver. The sensation alone threatens to release a torrent of thick, pent-up semen that\'s been building for a century.

The fact that I, as her brother, am thrusting my hips against Serena\'s ample buttocks, begging for her to "give me more, give me more," is already so sinful that it borders on the obscene. Yet Serena gently moves her thighs to assist my pathetic efforts, urging me to continue without stopping.

"Serena, Serena…"

"Ah… yes… oh… you\'re trying so hard, big brother."

As my cock peeks out from the gap between her thighs, Serena tenderly strokes the tip, wrapping her hand around it as if to say "well done" in a gentle, approving caress.

Using the flowing copper liquid as lubricant, Serena carefully caressed the glans like a precious treasure, barely touching the skin, worried that I might feel pain.

Her hand gripped the front, her thigh pressed the middle, and her hip cradled the base,

My cock was perfectly ensnared by Serena\'s body. If this is a trap, there\'s no escape.

I have no choice but to shamefully rock my hips until I reach release… …

"Ah… ah… ah…"

I mark my territory by rubbing my cock against Serena\'s cherished pussy.

Holding my sister who\'s too embarrassed to even look back.

"Mm, ah… ah…"

I gently nibble her reddened ear.

"I\'m embarrassed…"

Tightly.

Serena\'s thighs lock onto my cock.

Perhaps she\'s tense from being firmly held by her brother engaged in pseudo-coitus, the sweat and heat soaking into Serena\'s thighs envelop my cock fervently.

I clench my hand.

It\'s because Serena\'s large breasts are gently swaying in the perfect position.

\'No, really. I can\'t.\'

"Brother…"

As if sensing my inner conflict, Serena stroked the head of my cock and said,

"I\'ll help you, so release it♡"

"Ugh…!"

I grabbed Serena\'s large breasts.

"Mm!"

Serena pushed her ample rear even further back. Sweat was no longer the only thing drenching my erection.

My cock, nestled in her thighs, met with the slick wetness of Serena\'s eager pussy, intertwining perfectly.

Ahh!

Serena\'s warm pussy!

Serena\'s warm pussy was incredible!!

Instead of voicing such crude words, I shook my hips enticingly and continued to thrust against Serena\'s large buttocks.

Thump, thump, thump♡

"Coming…!"

Unable to resist, I climaxed into the tight embrace of Serena\'s thighs.

Vrroooom… Plop… Plop… Vrroooom!

"Kyaa…!"

I tried to catch the release in my palm, as I had done the first time, but it didn\'t work out,

and it seemed to have scattered all over the floor.

Vrroooom! Splat! Vrroooom! Splat!

Oh, oh, wow.

Squeezed out by Serena\'s thighs.

Twitch, twitch.

Catching my breath with my hips still pressed forward was the best I could do for now.

I found myself completely relieved on Serena\'s thighs.

However, it was not over yet.

"Ugh."

Serena locked my erect cock between her thighs once more and said,

"Is once not enough for you, big brother?"

Squeeze.

I embraced Serena tightly, as if trapping her within my arms. She let out a satisfied sigh.

"Let my thighs take care of you, big brother ♡"

Serena\'s thighs, perfect for rubbing my cock!

I vigorously shook my hard cock, cumming four times.

I continued to hold Serena close and shook my hips.

Time passed, and Serena became covered in sweat.

"Big brother… I… should… slowly… go to… the academy…"

"Just one more time…!"

I clung to Serena, who was trying to finish, and bumped my hips against her buttocks.

Cumming once more on Serena\'s thighs…!!

Spurt… Splatter… Spurt…!

"Ah, ah, my thighs feel so tingly…"

"…Then, should we call it quits here?"

"Are you satisfied? Oh…"

Serena gazed at my still-hard cock,

muttering in admiration with a hint of astonishment.

"…Wow. My brother\'s future girlfriend… will really be in for a treat…♡"

Yesterday I pleasured myself with my hand.

Today, I begin the day by rubbing against my younger sister\'s thigh.

I wonder if it\'s the "OnaAka" that has made me like this, or if I\'m just naturally this way.

Even amidst the anguish of pathetically succumbing to my lust, the sensation of Serena\'s thighs loftily floated through my mind like clouds.

A short while later.

Serena kneels down and wipes the semen I spilled on the floor with a tissue.

"I\'ll clean it up, so just leave it be."

"Uh-uh! This isn\'t something my brother should do. It\'s something a sister should take care of."

"...."

I\'m not sure what she means by that,

but as I mop the floor, I start gazing hypnotically at Serena\'s big buttocks as they sway back and forth.

…Oh. Oh oh.

Mm. Hmmm. Oh oh.

Huh? She\'s already finished wiping it up.

My eyes meet Serena\'s, who had been focused on cleaning the floor.

"Brother…"

"Ah… Well, about that…"

As I try to explain my \'naughty gaze,\'

Serena stands up and says with a bashful expression.

"Next time, I\'ll think of an even better method."

"Next time?"

"Yes. Next."

Serena\'s eyes formed an enchanting half-moon shape.

It\'s because I was admiring her backside.

My simple, inner thoughts were already exposed to Serena. I have no control.

"Wouldn\'t you prefer if there were no next time? Brother."

"...The next one… isn\'t important...."

From today on, my top choice is neither 9-letter words nor Ne2 ver.

"Serena! Where are you?"

Stella is searching for us.

A hectic morning has started.

I decided to prepare breakfast for Serena, who was running out of time due to indulging her brother\'s leg fetish.

\'Let\'s go with egg and mayo sandwiches.\'

Upon opening the refrigerator, I found a can of tuna as well.

This combination is a surefire hit!

Seeing Stella, who came out to eat later, devouring her food with enthusiasm, it seemed I hadn\'t failed.

\'She probably doesn\'t know I made it.\'

"What? Why are you looking at me?"

"…O-panty-color?"

"Huh?"

"It means, what color is your underwear today?"

Stella left her seat, clearly displeased.

It\'s okay. I didn\'t actually ask her to show me….

I\'m merely ensuring that the sole connection between Stella and me remains strong and functional.

Bidding farewell to Serena and Stella at the entrance as they wear their school shoes, I too prepare to head out.

\'I didn\'t need to give them a ride today.\'

It seems that my two younger sisters are using public transportation. Strangely, I feel a tinge of disappointment.

\'I guess I enjoyed going to school with Serena. I did.\'

Ding.

A message from Serena arrives.

[Serena]

(A picture showing her panties as she lifts her skirt up slightly)

Today, my panties are purple. Big brother, cheer up ♡

…Alright. Let\'s stay strong today.

Onahole man Kim Sang-hyuk, whose entire fortune amounts to 54 coins.

I don\'t want to remain a D-class older brother to my two adorable younger sisters until "OnaAka" comes to an end.

Fortunately, today\'s Yagem Sang-hyuk is invincible.

I\'ve managed to free six feet from my sister\'s sturdy thighs since the morning.

As much as I feel a sense of shame for losing my true self, I\'m filled with confidence to live in "OnaAka."