Ero Academy
Chapter 153: Chapter 155 – Bitch Mode Serena

Rewinding time to last night.

Serena had finished her housework and spent the remaining time studying.

The neat and beautiful handwritten notes, typical of an exemplary student, weren't progressing today. It was evidence that her mind was elsewhere.

"Oppa…"

She sighed deeply.

Serena felt her cheeks flush and her breath grow short, just thinking about her brother.

Sitting close to her desk, Serena moistened her pretty lips, pondering filthy words meant for her brother.

"Serena's little sister's pussy for you, Oppa... Can't you just fuck it?"

A vulgar word like "pussy" embarrassed her, probably because she wasn't accustomed to saying it.

"I can't feel it. This isn't enough.

Serena knew instinctively.

'Oppa isn't thinking about anything like this... Is there a way to make him use his little sister's hole?'

Their hearts were always checking each other out, bodies rubbing together.

Just give it a little push, and from then on, it would move on its own like riding a swing.

Although her brother's subtle resilience at the edge of a precipice was unusual, Serena found herself drawn to him nonetheless.

She didn't see him as indecisive. Rather, he was trying to protect his family by shouldering responsibility as an older brother and maintaining his rationality.

"Ah… Brother."

As Serena lovingly imagined her brother, she gently fondled her breasts. His hesitation and refusal to cross the line were evidence of his love for his younger sister. This realization filled Serena with a mixture of sorrow and tenderness.

All she wanted was to envelop her brother in the most intimate embrace a woman could offer.

'Just like back then.'

Even if the events of that day had been a mere accident or mistake, her brother's throbbing cock had undeniably penetrated Serena. That experience grew larger and more significant within her, eventually leading her to believe that 'it has to be my brother's cock.' It became the driving force behind her thoughts. Though their encounter had been a forbidden tryst, Serena's feminine instincts had long ago chosen her robust brother as her lover.

She had to let him know.

The moment her brother's cock had entered her womb like that of a prince, the fate of her sisterly pussy had been sealed.

"If I had moved my hips like that... If my brother had taken my sister like that,

Unfinished thoughts lingered, floating around in Serena's mind. Her heart was set on seducing her brother.

If her brother wouldn't cross the line, then his sister had no choice but to do so.

"I want to carry my brother's child."

Now, mere similar acts were no longer enough. Serena wanted to know just how much her brother desired his sister, and she was determined to replace out with her body.

'Is there a surefire way?'

At that moment, Serena's phone vibrated.

[Isolde]

Did the sexy underwear plan work?

[Serena]

(Blushing emoticon) I'm in the middle of preparing that.

What could she do to make her brother lean further into temptation? With that intention, she asked the question, prompting Isolde to inquire sharply.

[Isolde]

What's your goal for going that far? Sex?

Serena was caught off-guard, nearly dropping her smartphone in surprise.

[Serena]

What???

[Isolde]

You don't have to hide it. It's obvious that the goal is to have sex with Sang-hyuk.

I've been caught...

Isolde is a friend with whom I can share secrets, but...

[Isolde]

By the way, Sang-hyuk is truly amazing. Do you know that your mind goes completely blank, and you don't think about anything? The afterglow lasts for tens of minutes, but he doesn't even consider stopping.

I feel like I become a hole that makes noises, and my arms and legs lose all their strength and start shaking.

[Serena]

… If Sol succeeds, that's all!? Me too; I want to do it too. Teach me as well!

[Isolde]

Do you want to know the secret? Do you want to know everything about Sang-hyuk?

[Serena]

I want to know! Teacher!

It was Isolde who had boasted about having her first experience with Sang-hyuk just a few days ago.

But for Serena, it's a world of difference.

Anyway, Isolde succeeded after all.

[Is_solde]

So? What's your plan?

Serena told Isolde everything she had in mind.

[Serena]

… Like this. I'll try to do it with the feeling of confessing my desire to be with him.

[Isolde]

Serena doesn't know much about men, does she?

[Serena]

Please teach me, Master Isolde!

[Isolde]

You have to make them impatient. Men are like hunting animals. You can't succeed if you keep baring your breasts, offering your buttocks, and only trying to make them feel comfortable.

[Serena]

Is that how it is?

[Isolde]

Coincidentally, I was also creating an NTR story for a broadcast.

I'll share the script with you. If you follow it, Sang-hyuk will hold onto Serena all night and have incredible sex.

"Will he hold me tight and have sex with me all night?"

A glimmer of excitement flashed in Serena's eyes.

That… sounds amazing…♡

I'm glad I asked Isolde! Indeed, it's best to listen to someone with experience.

[Serena]

Please tell me anything. Master Isolde!

[Isolde]

Come to the D○ code!

Serena opens her laptop and engages in a one-on-one voice chat with Isolde, who shares the script for making a man impatient.

The concept was "Serena, who might be taken away."

Upon reading Isolde's script, Serena found herself slightly taken aback.

"Isn't this a heartless lie? I just don't like other men."

"Just pretend. The truth will be revealed soon enough. It's meant to be a catalyst."

"But still… 'There's no choice but to learn with our bodies while dating,' is a bit much."

Isn't that too harsh?

I couldn't bring myself to say that to my friend, who went out of their way to write the script.

but from Serena's perspective, most of the NTR scripts were already crossing the line.

"Why? It's both provocative and erotic."

"I want oppa to always feel comfortable, not stressed, and to snuggle in my embrace."

That's Serena's genuine desire.

No matter how desperately she wanted something, deep within Serena's heart, she didn't want to do anything that would hurt Oppa's feelings, not even the slightest bit.

Isolde, understanding Serena's heart, continued her explanation logically.

"You can do as you please later. Right now, you have a rival."

"A rival…"

"Stella is also after Oppa, isn't she? And she's quite aggressive about it."

"Yes, let's compete to see who gets pregnant first."

"…"

The sound of Isolde swallowing her breath carried over from the screen.

"I understand how you feel since the other person is Sang-hyuk, but for the prickly and sensitive Stella to say such a thing..."

"I was a bit surprised too."

It's astonishing that Stella is trying to date her brother.

Now she even declares she'll have her brother's baby.

"She's desperate too. Since her rival is Serena,"

"Huh? Me?"

"Hasn't it been only a short while since Stella discovered Serena's secret relationship with her brother?"

"Yeah."

"Isn't it because they were the only ones enjoying themselves that their self-control broke completely? Since Serena is doing it, it's not strange for me to do it too, with the same feeling."

"…"

Serena thought Isolde's conjecture was quite reasonable.

When she first crawled under her sleeping brother and taught him how to pleasure with her mouth, Stella said:

"Why would you suck where he pees? It's dirty."

"This is a sister's sexual service. My brother is very happy about it."

"I can't believe I'm doing something so filthy with my little sister."

"I, too, have had my mouth filled with evidence of my brother's pleasure, right?"

At that time, when Stella was initially frightened by the act of sucking a cock, she was taught the meaning behind each aspect of the deed. Serena remembers the look in Stella's eyes. It was as if she was jealous of the two people secretly playing together, leaving her out.

I want to join in too. I want to do it as well. Encouraged by that feeling, Stella placed her brother's cock into her innocent mouth. And now…

She has reached the point where she uses her mouth in an attempt to surpass herself.

"I think that's right."

Serena realized the source of the impatience that stirred within her.

"I want to be ahead of Stella too. Is this method really effective?"

"Are you doubting its effectiveness?"

"I'm worried… What if my brother gets angry?"

"Let's make the prescription a bit stronger, then."

"Prescription?"

Isolde shared a few pieces of advice.

"You have to make it clear that you're only acting. If it's too realistic, you might end up hurting Oppa."

"Yes. Yes! In fact, make it so forcefully that it seems contrived."

Serena practiced once.

"What if a horde of men come and take me? Ah, I'm talking about the numbers."

"Good job!"

"Why is it about the number, but why is it written, 'if I'm taken'…?"

"Imagine Serena being taken by them."

"No way! This is out of bounds!!"

Isolde and Serena engaged in a thorough discussion and adjusted the intensity of the script.

"I don't show my underwear to just anyone."

"Well, another man might see it while going up the stairs."

"Wouldn't it be too awkward, so much so that it might break the immersion?"

"I don't know! All you have to do is stimulate the anxiety that a male might snatch you away. Serena isn't a fool; she wouldn't expose her panties on the stairs, but...

"...stimulating anxiety…"

Isolde, realizing that Serena felt guilty, pulled out a whip.

"Student Serena, do you not want to have sex with your older brother?"

"Ah, I want to be embraced!"

"To best my rival, I must be this ruthless. In return, quickly give me the antidote. If my brother seems close to relenting, I'll immediately switch to the gentle Serena Mode."

"Ge-gentle Serena Mode"

"Because if the Bitch Serena Mode lasts too long, my brother will be emotionally hurt."

Serena spoke with a slight pout.

"I'm not a robot; why do I have a mode?"

"Think of it as a mental switch. If I recite lewd lines but I'm passive, it's embarrassing for the listener."

"I don't feel it."

"Before we start, I am lascivious. The most lewd and provocative sister in the world. Repeat it ten times before entering."

"I-I am lascivious!"

She bites her tongue right away.

"Ah…!!"

"Let's get comfortable with my little sister's pussy. Follow my lead, Serena."

"Let's get comfortable with my little sister's pussy."

"Since it's what the active younger sister does, it's bound to work. It's meant to dismantle my brother's rationality."

"…"

Under Instructor Isolde's guidance, Serena became armed with a variety of sharp-edged weapons.

"I'll submit an excuse for your absence tomorrow on your behalf. You have to delay it so that your brother never sends you to the academy."

"Will my brother hold me back if I say just a few lines like this?"

Serena envisioned her brother's face, sternly asking, "What kind of joke is this?"

She was frightened.

If she engaged in such antics and incurred her brother's wrath, she wouldn't be able to make things right. Being the kind younger sister who helped Sang-hyuk replace relief by caressing his manhood, as she did now, was a cherished role for Serena.

"Rather, it was too provocative, so I toned it down slightly."

Isolde confidently asserted.

"Which brother would want to see Serena taken away?"

"Would that be the case?"

"If you can't trust yourself, trust your chest."

Chest.

Sang-hyuk's favorite, his sister's ample breasts

Serena fondled her own breasts and made up her mind.

"Yes… I'll try… Thank you, Sol!"

"Be sure to share your experience later. Oh, and, Sang-hyuk, you're truly incredible, so brace yourself."

"Indeed, that's amazing."

That's what someone experienced would say. It must be true.

"Brother… you're amazing…"

That night, while reviewing her plan, Serena fervently pleasured herself. To bring out the lascivious side of Serena, she engaged in method acting.

"Ah… Ahh… Hnn… Brother…"

Serena arched her back on the bed and gently rubbed her vagina.

"Mmm… I am… lewd… the most… lewd and provocative little sister in the world…♡"

Not just ten times, but a hundred times. A thousand times rather than a hundred.

Having completed her persistent self-suggestion, Serena greeted the morning. No one knows how much effort she puts in. She practiced and rehearsed the script until her throat ached.

All she needed to do was perform well without faltering in front of her brother.

As Serena prepared breakfast, Sang-hyuk naturally ground his cock against her ass.

'Hnn. Hnngh…'

Serena clenched her buttocks tightly and endured the rubbing.

'My clit is so sensitive, and now it's gone...'

With her self-suggestion that she's the most lewd sister in the world, her body refuses to obey. Her body reacts excessively to her brother's perverted touch.

If my brother had smacked my rear and told me to lie down because we were going to have sex right away, I think I would have obediently laid on the floor, belly exposed, like a puppy.

'Let's not forget. Just as Sol wrote...'

When Stella, who always leaves for school first, departs from home, the operation commences.

'Ah, I'm short of breath.'

What if it fails? What if it fails?

What if my brother scolds me, telling me to study instead of engaging in such acts?

Serena felt a surge of anxiety as she put on her student shoes. Her heart wouldn't stop pounding.

"Once again, there's no equal to Serena when she's in her provocative mode. Even the student council president would have to concede defeat."

Sol had said as much, but still, her courage was lacking.

Her breath grew labored, and her pupils dilated. She didn't even know where she was looking.

At that moment, the urge to escape—to go to school as if nothing had happened—welled up within her.

'Brother…?'

Her brother's gaze was fixated on his sister's thighs.

That was the signal that unleashed the lascivious and assertive Serena into the world.

From then on, Serena had nothing to fear.

"Oppa."

"Uh, huh?"

"Today is purple."

She exclaimed.

As Serena regained her senses, she found herself practically dragged into the room by her brother, as if kidnapped.

Her school shoes lay haphazardly strewn about the hallway, having been hastily removed.

Scattered on the floor of her brother's room were textbooks and bags. A purple bra and panties that her brother had taken off while caressing her sensitive breasts...

These were the traces of their successful plan.

The morning of the third week of "OnaAka" begins.

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