Awakening: My Yandere sister is obsessed with me

Jun, who had been listening to the fragmented confession with a growing sense of bewildered frustration, could only grasp a single, undeniable fact: these two knew each other. And not just casually.

The way Haruto had held her, the quiet urgency in his voice, the raw emotion that had flickered in his usually stoic gaze – it all screamed of a deep, shared past. Internally, Jun wailed. His carefully guarded beautiful damsel, the one he had spent the better part of the evening heroically protecting, was now draped artlessly in the arms of his childhood friend.

The sheer injustice of it gnawed at him, a bitter resentment bubbling just beneath his usually calm exterior. He felt an irrational urge to stomp his foot, to demand an explanation, but Haruto was already moving, his face set in a grim line of determination.

Haruto, however, was oblivious to his friend's silent anguish. His focus was entirely on Yuki. Scooping her up with practiced ease, he adjusted her delicate weight in his arms.

There was no time to explain, no moment to address Jun's obvious displeasure. With a leap, he mounted his Moonlight Sword. The air crackled around them as he shot skyward, a fleeting streak against the urban night, leaving a flustered and utterly neglected Jun fuming below.

The flight home was a blur. Haruto's mind raced, processing Yuki's story and the implications of Miki's explanation about the Black Serpent.

He clutched Yuki closer, feeling the fragile beat of her heart against his own. He remembered the innocent sparkle in her eyes from years ago, now replaced by a haunted emptiness, and a protective instinct surged within him. The thought of someone wanting to harm her, wanting to erase her existence, made his heart sink.

As he neared the familiar silhouette of his home, a figure stood illuminated by the faint porch light. Her posture was tense, her shoulders hunched. It was Satsuki. Even from a distance, Haruto could feel the palpable aura of distress radiating from her.

As he landed, the revelation blade dissipating into motes of light, Satsuki turned, her eyes wide and red-rimmed, a stormy mixture of fear, hurt, and accusation swirling within them. The dim light cast long, anxious shadows around her, making her seem smaller, more vulnerable than usual.

"Haruto!" she cried, her voice trembling, laced with an almost desperate anger. "Where have you been?! Why did you abandon me?! And who… who is that girl?!"

The questions tumbled out, each one a sharp dart aimed at his heart. Satsuki, usually so composed, so understanding, was clearly distraught. He could see the unshed tears glistening in her eyes, reflecting the depth of her worry. The image of her standing there, alone and afraid, tore at him, adding another layer of complexity to an already tumultuous night.

Haruto moved quickly, his free hand reaching out to gently cup her cheek. "Satsuki, calm down. It's okay. I'm here now." He stroked her hair, his gaze soft, reassuring. "This is Yuki… remember? From when we were kids?" His voice was a calm anchor in her stormy emotions, hoping to soothe her frayed nerves.

At first, Satsuki's expression remained clouded, her gaze fixed suspiciously on the unconscious girl in his arms. But as Haruto uttered the name, a flicker of recognition ignited in her eyes, slowly pushing aside the hurt and anger.

Her brow furrowed, a faint memory stirring. Her gaze drifted from Haruto's comforting face to Yuki's bruised features, and a slow dawning understanding spread across her features. The initial defensiveness in her posture began to soften, replaced by a subtle shift towards concern.

"Yuki…?" she whispered, the name a hesitant question on her lips. Her eyes widened in genuine surprise, tinged with disbelief. "But… what is she doing here? After all these years?"

The accusatory tone was gone, replaced by genuine shock and a glimmer of her usual compassionate nature. A faint trace of a forgotten smile seemed to almost cross her lips, before being quickly overshadowed by something else...

Haruto nodded, a heavy sigh escaping him. He knew this would be difficult, that the past she thought they had left behind was now crashing back into their lives with the force of a tidal wave.

Gently, he shifted Yuki in his arms, ensuring she was comfortable, before beginning to recount the night's events, then started from the moment he found Yuki, the alleyway, the thugs, and then, slowly, carefully, he relayed her harrowing story of the Black Serpent, of the internal power struggle, of her father's downfall, and of the new leader who sought to erase her entire lineage. He omitted no detail, laying bare the grim reality of Yuki's situation, the desperation that had driven her to his doorstep.

As he spoke, Satsuki listened in silence. Her initial shock gradually gave way to a deeper, more profound stillness. Her eyes, still a little red, never left Haruto's face as he explained, absorbing every word, every nuance of his tone.

When he finished, the only sounds in the quiet night were the distant hum of the city and the gentle rustle of leaves in the breeze. The tension in the air was palpable, thick with unspoken questions and the weight of a shared, complicated history.

Satsuki didn't speak. She simply stood there, her gaze fixed, unwavering, first on Haruto, then on the unconscious Yuki nestled in his embrace. Her expression was unreadable, a complex tapestry of emotions that Haruto couldn't decipher. It wasn't anger now, nor even just surprise.

It was something deeper, something that hinted at a knowledge he didn't possess, a silent understanding that seemed to connect her to Yuki's plight in a way he couldn't quite grasp.

The air between them, already thick with the weight of unspoken history, grew heavier, charged with an almost palpable tension. The secrets of their shared past, long dormant, were beginning to stir, awakened by Yuki's unexpected return.

And as Satsuki continued to stare, her silence spoke volumes, hinting at a much larger, darker narrative yet to unfold.

Finally, after what felt like an eternity, Satsuki's voice, though quiet, cut through the silence like a sharp blade. "The Black Serpent… I see." There was no emotion in her voice, just a chilling calm that sent a shiver down Haruto's spine. "So, the past always catches up, doesn't it?" Her gaze flickered to Yuki's pale face.