Night.
Opening the door to his apartment, Masachika noticed a pair of school shoes on the floor. He already had an idea of who they belonged to.
Sure enough, in the living room, his younger sister, Suou Yuki, was lying face down on the sofa, casually reading a manga. The super-short shorts she was wearing could barely be considered pants. The slightly raised hem revealed the thin line of her underwear, while her smooth, white thighs swayed freely up and down.
Of course, Masachika wouldn't feel any sexual attraction toward his own younger sister, but Yuki's appearance was truly inappropriate. If any other man saw her like this, they would definitely be aroused.
Without turning her head, Yuki spoke, her voice sounding lazy.
"Welcome. Did you really make sure Alisa-san got home safely?"
"Why are you here?"
"Because I'm staying over."
"Why didn't I know about this?"
"Because I just told you now."
Masachika simply maintained a flat expression. He was already used to Yuki's arbitrary behavior.
Soon, Yuki returned her focus to her manga, her expression serious.
"Oh, I see. So the mysterious handsome guy walking with the heroine? It must be an older brother and younger sister! Looking at it, this guy is definitely her older brother. Besides, it's already obvious that they're siblings."
"Why is the heroine so oblivious?"
Masachika overheard his sister's commentary and disagreed. "You don't need to dictate their relationship. You just want a childhood friend at school, right? No need to comment so much."
"Huh?"
Yuki turned around, glaring at him with a frown.
"This isn't dictating. Do you even know what a childhood friend trope is?"
"Someone who's known you since childhood?" Masachika answered spontaneously.
"Exactly! In other words, older brothers and younger sisters are also childhood friends. Childhood friends, otaku friends, or siblings—they can coexist!"
Masachika was slightly taken aback by her excessive enthusiasm. "That's a bit of a stretch."
Getting up from the sofa, Yuki stood close to her brother, looking at him confidently.
"It's not a stretch. It's just a metaphorical explanation."
"Haaah..."
Unable to respond to his sister, who appeared perfect in public but turned into a hardcore otaku when with him, Masachika could only let out a tired sigh.
"Wait."
Yuki sat back down on the sofa, reading her manga with a surprised expression.
"The guy with the heroine is her older brother."
"Of course." Masachika replied without surprise. Hadn't they just discussed this speculation earlier?
"But he kissed his younger sister."
Turning to Masachika, Yuki looked shocked.
"Seriously?" Masachika frowned. He hadn't expected the plot to take such a turn.
"Seriously! This is definitely going to be a masterpiece!"
With sparkling eyes, Yuki continued reading her manga with great enthusiasm.
Masachika could only shake his head. "Well, that's impossible. Logically, that means they're not blood-related, right?"
Hearing this, Yuki, who couldn't accept it, grabbed her brother's collar and shouted.
"You idiot! The fact that they're siblings is what makes the story even more interesting!"
The reason she loved the sibling romance genre was that she secretly hoped her older brother would cross the boundaries of their relationship. Unfortunately, Yuki was destined to be disappointed because her brother had nerves of steel. No matter how much she teased him, Masachika would never do anything indecent to her.
Masachika looked at her flatly. "You're way too deep into this fandom..."
Yuki snorted, releasing her grip, then looked at him with a sly smile.
"By the way, Onii-chan, I saw something amazing today."
"What was it?"
While filling a glass with water from the dispenser, Masachika drank it casually.
"I saw two of your classmates having sex at school."
"PFFTTTT—"
Instantly, Masachika spat out the water he had just drunk after hearing her words.
"You're not lying, are you, Yuki?"
"Sadly, this is the truth. And you know what's even more shocking?"
"What?"
Masachika looked at his sister with immense curiosity.
"From the conversation I overheard, it turns out the girl is pregnant."
Masachika fell silent for a moment, trying to process the information. If this was true, then the situation was far more complicated than he had imagined. This could turn into a scandal if the school found out!
Don't they know about condoms and birth control pills?
"Who are they?" Masachika asked, curious if he was familiar with the classmates Yuki mentioned.
He knew the names of all his classmates. However, only a few had any meaningful friendship with him. Most were just acquaintances with little interaction.
"I can't tell you. I promised the guy I wouldn't tell anyone about what I saw." Yuki smiled smugly, enjoying her brother's curious expression.
Masachika paused for a moment, then narrowed his eyes. "Wait… that means you got caught by the guy?"
Hearing this, Yuki scratched the back of her head, then stuck out her tongue slightly, with a clearly forced cute tone, saying, "Tehee~"
"Oi, don't act like this is a small matter! It's dangerous! What if the scenarios in those doujins actually happened to you? What if he tried to threaten you to keep the secret?" Masachika scolded her with a serious tone.
Hearing this, Yuki turned her body toward her brother and looked at him with a dismissive expression.
"Hah? Onii-chan, you've been reading too many doujins."
"..."
Masachika glared at her with an annoyed expression but couldn't refute it. After all, he had indeed read scenarios like that. But still, this was the real world, and he couldn't ignore the possibility of something bad happening to his beautiful and cute sister.
◆━⊰✧⊱━◆
In her spacious and neatly organized room, Alya had just finished her study session.
"Mhm~... So tired..."
Raising both hands above her head, Alya stretched her stiff body after sitting for too long. Her tense muscles relaxed slightly, and she let out a soft sigh.
Since she was at home, Alya was wearing casual clothes that were more revealing than usual. A thin tank top without a bra clung snugly to her upper body, revealing her slender waist and smooth, flat stomach. The shorts she wore were even shorter than her school gym uniform, exposing most of her smooth, white thighs. Her silver hair cascaded freely, giving off an unintentionally alluring vibe.
Her eyes then landed on a white cat plushie lying on her bed—a gift from Masha some time ago. Alya picked up the plushie, staring at it with a pout.
"Hmph… it doesn't look like me at all."
She muttered softly, seemingly dissatisfied with her sister's choice. However, even as her mouth complained, her hands gently squeezed the plushie, even pulling it into a hug. The presence of the small object brought a strange warmth to her heart.
Secretly, Alya was happy about her sister's attention.
*DING—DONG!*
Suddenly, the doorbell echoed throughout the house. Alya, who was still lying on her bed hugging the white cat plushie, frowned. After a few seconds passed without anyone answering the door, she realized that no one else could do it except her.
"Why isn't Masha answering the door?"
Reluctantly, Alya got up and put on a thin satin nightgown that only reached mid-thigh. Casually, she tied the belt around her waist, though it still left a slight gap revealing her soft, white skin.
Descending the stairs to the first floor, Alya noticed the sound of running water from the bathroom. Masha was taking a shower. That's why no one had answered the door.
Since it was already nighttime, she didn't open the door right away. Instead, she pressed the intercom button to check the visitor through the security camera.
"Who is it?" She asked cautiously.
On the screen, a delivery man in a uniform with a hat and mask stood holding a package.
"I'm a delivery. There's a package for Maria Mikhailovna Kujou." He replied briefly.
'Masha bought something online? That's unusual.' Alya thought, puzzled.
However, after confirming that there was nothing suspicious about the man, Alya finally opened the door. The cool night breeze touched her skin, making her shiver slightly.
'Woah, this is the first time I've seen a Russian girl. She's so beautiful...'
"Please sign here."
Thinking this, the delivery man handed her the package, and Alya signed the receipt on behalf of her sister.
Meanwhile, the man subtly glanced at Alya's chest, which slightly peeked out from the gap in her nightgown. The porch light accentuated the beauty of the girl's figure, which, though she was unaware, was enough to catch any man's attention.
After receiving the package, Alya immediately closed the door without further ado. She didn't notice the lingering gaze that had briefly fallen on her or the man's expression before he turned and left.
After closing the door, Alya stared at the package in her hands with curiosity. Her eyes read the item name listed on the delivery slip.
"Female Indonesian high school uniform?"
Her brow furrowed. Why did Masha buy this? As far as she knew, Masha had no connection to Indonesia, let alone any need for a school uniform from that country.
Before Alya could think further, the sound of footsteps came from the stairs. Masha, her body wrapped only in a white towel with her hair still wet, appeared with a slightly tense expression.
"Ah, thanks for receiving the package, Alya-chan." She said quickly, taking the box from her sister's hands.
Masha, who was usually calm and gentle, now seemed in a hurry. She immediately hugged the package tightly as if afraid of being found out, then, without waiting for Alya's response, she hurried up the stairs to her room on the second floor.
Alya watched her sister's retreating back with a suspicious gaze.
"Masha looks panicked. Very suspicious…"
"Normally, Masha wouldn't react like this just because of a shopping package. Something's off."
Alya didn't know what Masha was planning, but her gut told her that something was being hidden from her.