First day of teaching(2)*

"Heh~ weren't you getting really cheeky for mere little brother?"

"H-hm? ah..."

Nao realized too late that he had been gently patting his older sister's head. Her cat-like eyes sparkled as if they discovered something amusing to play with, he noticed his sister looking at him with a mischievous glint in her eyes.

Her smirk grew wider. Nao hesitantly took a step back and removed his hand from her head. This was not something he would normally do, but seeing how hard she had been working, he couldn't help but pat her head without thinking.

Now, he feared that he had unintentionally hurt his sister's delicate pride once again, judging by her amused smirk.

"H-haha... nee-chan, I didn't do it on purpose you se-huh?!"

But before Nao could explain further, caught off guard by his sister's sudden playful attack, found himself lying on the bed with Chiaki on top of him.

As they both regained their composure, their faces mere inches apart, a rush of emotions flooded through them.

In a matter of seconds, his sister effortlessly shed her outer dress, unveiling a captivating ensemble consisting of a sleek black undershirt and form-fitting jeans.

As they stood side by side, he couldn't help but be mesmerized by the sheer elegance radiating from her every pore.

The way the fabric clung to her curves accentuated her natural beauty, leaving him in awe of her stunning appearance. Her impeccable sense of style and grace were impossible to ignore, and he found himself unable to tear his gaze away from her enchanting presence.

Her boobs were currently pressing on his chest, he could see a glimpse of her boobs. She looked stunning.

Even though he knew it was wrong, Nao could feel his heart racing, his cheeks flushing with a mix of surprise and excitement.

Chiaki, her playful demeanor momentarily forgotten, stared into her brother's eyes, captivated by the intensity of the moment.

The closeness between them allowed them to sense each other's breath, creating an intimate connection that neither of them had experienced before and time seemed to stand still as they held each other's gaze, their minds racing with unspoken thoughts and desires.

Nao, still chuckling from the initial surprise, attempted to find his voice to break the tension. He cleared his throat, his words coming out in a soft, breathless whisper.

"Chiaki-nee...what was that for?" he managed to say, his voice filled with a mixture of confusion and curiosity.

Chiaki, her playful nature returning, grinned mischievously. "It's your fault for getting cocky over teaching me some mathematics," she replied, her voice laced with a hint of playfulness.

"I couldn't resist teasing you a little. You looked so serious trying to clarify things." Her eyes sparkled with a mixture of affection and mischief as she continued, "Besides, it's not every day we get to be this close, right?"

"*Gulp* N-nee-chan please get off of me... immediately..."

Nao could feel the boobs of his sister squishing in his chest, and their fluffy sensation gave him a shock through his veins.

He gulped down a large amount of saliva, his breathing was getting haggard.

All this time, Nao barely controls his heightened sexual urges by diverting his attention to calisthenics but this time he goes too far to control himself. His dick had already gotten rock-hard.

He couldn't help but get shamed when he realized that he lusted over his sister's body. Even though Chiaki was not his original sister and it's just a simulation, that doesn't change the fact that she was his sister in this simulation.

Even though he has the strength to easily push his sister away, he's now in a predicament where his body won't cooperate. He struggles to contain the wild desire that's desperately trying to escape from within him.

If he gives in to his lust, he fears he won't be able to return to his normal self. With each passing second, his arousal intensifies. 

It's not like he didn't have any experience with girls in his previous life instead he had a decent amount of experience but his huge amount of testosterone made him unable to control himself.

Chiaki, his sister, suddenly feels something firm against her backside and notices his undeniable erection. This made her also embarrassed about their situation.

She understood why Nao's voice became desperate. But instead of getting off of him, her playful smirk intensified.

"It seems someone struggling with his hard member down there, do you want me to teach you something in return?"

"N-no need... just get off of me..."

"Heh~ I don't want to move away though... It's not like every day I can able to see my brother's cute expression like this... What should I do?..."

His sister Chiaki didn't appear to have any intention of leaving but rather deliberately pressed her chest against Nao's, trying to arouse him further. Nao's breathing became increasingly erratic as he felt the sensation.

He tightly gripped the bedsheet, desperately trying to resist any temptation. Observing his struggle, instead of releasing him, his sister grew bolder. She pressed her body even closer to Nao and whispered seductively in his ear.

"Do you want to see my boobs?~"

His heart pounded in his chest as Chiaki's warm breath tickled his earlobe.

She pulled on her undershirt, revealing a teasing peek of her cleavage. He caught sight of her perky pink nipples as she spoke in a seductive tone.

Her words sent shivers down his spine, awakening a primal desire he had never experienced before.

It was as if a forbidden flame had been ignited within him, threatening to consume everything he held dear.

'Dammit!!... She didn't realize how serious our situation is right now... I know she is just teasing me.... but... I am barely controlling myself...'

He couldn't help but curse at his situation in his mind without knowing how his situation became like this.

'It doesn't feel real at all... it feels like I am in a scenario.... of porn and hentai!... Wait!!...'

In that desperate situation, he achieved a certain realization as he thought deeply about everything, his current state, his past, the name of this simulation, and his unique gift.

The more he thought about it, he felt like he misunderstood the third condition of this simulation. His eyes widened in shock as he came to a single possible conclusion.

'Wait, am I trapped in a world straight out of a hentai anime?!!!'

***

Author's note:

I would like to express my deepest appreciation to Grey Knight Lord, Tempest1618, Manuel Chavez, WonderingAbyss, David Aderoju, GigaChad, Sir_dood134 (Mr. Andrew), Masutatai, Ceyhun Cagirici, Austin, Copinsa, Brandon Alberto Plata Espinoza, Nawaf Rashed, PhantomNite, Darkaito 121, Jaydon Tonkin, Eric, and Devor for their invaluable support and contributions to our fanfiction. Your sponsorship and encouragement have had a profound impact on our creative endeavors, and I will forever treasure your presence in our fanfiction journey.

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