About half an hour had passed since Jun Hao had been sitting and waiting calmly in the living room. Finally, the sound of the front door opening broke the silence. Siu Mei, his 17-year-old younger sister, came walking in, just returning home from school. Her condition was exactly like their mother’s had been earlier: she entered breathing heavily, panting for air, her face flushed bright red from the intense heat outside, and her entire body drenched in sweat. Her school uniform clung wetly to her skin, outlining her young body that had already developed quite fully and curvaceous, showing clearly her growing breasts and soft figure. She looked exhausted, hot, and incredibly thirsty.

Jun Hao watched her enter with dark, hungry eyes, admiring how the heat and sweat made her youthful form look even more tempting. He spoke to her with a feigned casual tone, though his voice was thick with hidden desire.

"You look completely out of breath... you are sweating so much and your whole body feels hot to the touch," Jun Hao said, observing her closely. "It must have been scorching hot outside today, wasn’t it?"

Siu Mei fanned herself with her hand, her chest heaving up and down rapidly as she tried to catch her breath, completely unaware of the danger sitting right in front of her.

"It was so hot, Brother! Seriously, it’s sweltering out there!" she replied, wiping the sweat from her forehead. "I’m sweating buckets like this... it feels so sticky and uncomfortable."

Without wasting a single second, Jun Hao reached out and handed her the small water bottle he had prepared earlier—the one heavily laced with the powerful aphrodisiac he had mixed just for her. He held it out towards her with a gentle smile.

"Here then, drink this first. Cool your throat down," he said smoothly.

Because her thirst was overwhelming and she trusted her older brother completely, Siu Mei grabbed the bottle immediately. She didn’t suspect anything at all. She twisted the cap open and drank it down quickly, gulping the contents rapidly, desperate to quench her thirst. Since the bottle was small, she finished it all in just a few large swallows, drinking every last drop until it was empty. She didn’t notice anything strange about the taste; it just tasted like slightly sweet, refreshing water.

"All done?" Jun Hao asked, watching her finish with immense satisfaction, knowing the drug was already entering her bloodstream. "Come here then, sit down next to me. Let’s just relax for a moment. Sit here and finish your drink... well, you already finished it. Afterward, you can go up to your room and change your clothes. You look so exhausted... I bet you were running all the way home just to escape the heat, weren’t you? If you are too tired to walk, I can carry you upstairs, you know."

Siu Mei giggled, her playful and teasing nature coming out as usual. She was known for always teasing her older brother, never taking him too seriously. She looked at him with a mischievous glint in her eyes.

"Really? Do you think you can carry me? I’m not that small anymore, you know, I’m quite heavy now," she teased, grinning broadly. "Aren’t you embarrassed to carry your own little sister like that?"

"What is there to be embarrassed about?" Jun Hao replied, his smile widening, hiding his dark intentions perfectly. "We are family, isn’t that right?"

"Oh, whatever you say!" Siu Mei laughed. Without hesitation or a single worry, she jumped straight towards him, leaping into his open arms. She wrapped her arms around his neck playfully, letting herself be carried by him from the front, pressing her body fully against his chest. "Thank you then, Brother! You really are a good big brother sometimes!"

Jun Hao held her tightly and firmly in his embrace. As he lifted her up, he felt her body weight and softness, and he realized once again how much she had grown. Her body was no longer that of a little girl; her breasts were firm and round, her hips were soft and wide, and her thighs were full and womanly. Seeing and feeling how mature her development had become only made his lust burn hotter and wilder inside him. She was ripe, young, fresh, and completely innocent—perfect for his taking.

He stood up slowly, carrying her securely from the front. As he began walking toward the stairs, Siu Mei was comfortably nestled in his arms, her legs dangling on either side of his waist, her chest pressed flat against his. Jun Hao took advantage of this position. While walking through the hallway and up the stairs, he deliberately and repeatedly rubbed and grinded his groin area against hers, pressing his lower body firmly against hers with every step. He enjoyed the friction, the warmth, and the softness of her young body through their clothes. Siu Mei thought it was just a natural movement from walking and didn’t think much of it, still giggling and chatting happily, completely oblivious to the hardness growing against her.

He carried her all the way up to the second floor, heading straight for her room—remembering clearly that each child in this house had their own separate bedroom, and he needed to take her to a place where they could be completely alone and undisturbed.

When they finally arrived at the door to her room, Jun Hao pushed it open with his shoulder while still holding her tight. The moment they stepped inside, he used his free hand to swiftly slide the lock shut, turning the key and locking the door tight from the inside, sealing them both inside the room with no way out.

Siu Mei noticed the sound of the lock clicking shut. She looked at him with a confused expression, yet still smiling playfully, thinking it was just another one of his jokes.

"Hey, why did you lock the door, Brother? You don’t need to lock it, you know," she said, tilting her head. "I feel shy... what if someone sees us or walks past the door?" She then teased him again, giggling naively. "What are you so afraid of anyway? We’re just siblings, right? There’s nothing to hide or be secretive about, hehehe."

Hearing those innocent yet teasing words made Jun Hao’s heart race with intense, burning desire. Her naivety was the most tempting thing of all. He simply smiled back at her, a dark, lustful, predatory smile that she didn’t understand yet. He didn’t answer her question; instead, he continued walking straight toward her bed, still carrying her from the front, their bodies pressed tightly together, their private parts still rubbing against each other through the fabric.

Reaching the edge of the soft mattress, Jun Hao didn’t gently place her down as she expected. Instead, he suddenly let his own body weight drop backward and downward, diving onto the bed while still clutching her body against his. As he fell, he twisted slightly so that he landed on top, pinning Siu Mei underneath him, his heavy, muscular body crushing her small, youthful form completely beneath his weight.

"Ah! Brother, you’re so heavy!" Siu Mei cried out in surprise and laughter, struggling playfully under him, trying to push his chest away with her small hands. "You nearly scared me to death! You are so heavy... I can barely breathe with you crushing me like this... get off a little!"

But Jun Hao didn’t move an inch. He remained fully on top of her, his legs trapping hers between his knees, his chest flattening her soft breasts, his face hovering just inches away from hers.

It was right at this moment that Siu Mei began to feel something very strange happening deep inside her body.

The aphrodisiac she had drunk earlier had finally reached its full effect, surging powerfully through every vein and nerve ending. The heat she had felt outside multiplied tenfold. Her skin felt like it was burning, feverishly hot and incredibly sensitive. A strange, unbearable itchiness began to spread all over her body, but it was worst in her most private places—between her legs in her groin area, and on her chest where her breasts were developing. It was a maddening sensation: itchy, tingling, throbbing, wet, and aching all at once.

Yet, mixed with this discomfort was an overwhelming wave of pleasure. Every time Jun Hao’s heavy body pressed down on hers, every time his weight squeezed her breasts, every time their lower bodies pressed together, she felt a rush of intense, wonderful sensation shoot through her. It felt so good, so satisfying, so desperately needed. She didn’t understand what was happening to her, why she felt this way, or why her body was reacting like this to her own brother.

"What... what is this...?" she whispered breathlessly, her eyes widening in confusion and haze. She looked up at him, her pupils dilated, her breathing becoming rapid and shallow. "Brother... what are you doing...? It feels... so strange... everything feels hot and itchy... especially down there... and here..."

She tried to push him away again, but her hands were weak, trembling, and instead of pushing, her fingers curled into his shirt, pulling him closer instinctively.

"I just... I just want to stay in this position a little longer," Jun Hao replied in a low, husky voice, his eyes fixed intensely on her lips. He didn’t stop; he continued to grind and rub his groin hard against hers, moving his hips slowly, deliberately, pressing his hardness firmly against her most sensitive spot through the clothes, sending waves of friction straight into her core.

"It feels... weird... but... it feels good too..." Siu Mei moaned softly, her mind becoming foggy and clouded by the powerful drug. "Why does it feel like this...?"

"This isn’t strange at all," Jun Hao whispered, bringing his face even closer until their noses were touching, breathing his hot breath right onto her lips. He reached up and gently cupped the side of her face, holding her head steady. "I am just really looking at you now... really paying attention to you... and I realized... you are so beautiful, Siu Mei. You have grown up to be absolutely beautiful."

Before she could process his words or react properly, Jun Hao closed the small distance between them and crushed his lips onto hers in a deep, hungry kiss.

He kissed her fiercely, forcefully, dominating her mouth immediately. He parted her lips with his own and thrust his tongue deep inside, searching frantically for her tongue, swirling around, hunting for it, wanting to suck it completely, to drain her breath, to claim her mouth just as he had claimed their mother’s.

At first, Siu Mei was shocked and stunned. Her eyes flew wide open, her body stiffening in surprise. She tried to pull her head back, confused and startled that her own brother was kissing her like a lover. But the effect of the aphrodisiac was too strong. The moment their tongues touched, the moment she felt his wet, hot tongue exploring her mouth, the maddening heat inside her body exploded. The pleasure was too great to resist.

Her eyes slowly closed, her resistance vanished instantly. Driven mad by the drug and the overwhelming sensation, Siu Mei surrendered completely. She kissed him back with even more intensity and passion.

She didn’t hold back. She wrapped her arms tightly around his neck, pulling him down closer to her. She moved her own tongue wildly, dancing and twisting against his, meeting his aggression with equal hunger. She sucked on his tongue hard, moaning softly and happily right into his mouth, completely lost in the pleasure. Her hands began to roam freely over his back, his shoulders, his chest, touching and caressing every part of his body with insatiable desire, returning every bit of his affection with twice the fervor.

Jun Hao was surprised for a second when she kissed him back so fiercely, but he immediately broke into a wicked, delighted grin. He was thrilled, overjoyed that she had fallen right into his trap just as he planned. She was no longer his innocent little sister; she was now his prey, completely enslaved by lust.

Embracing her tightly, crushing her body beneath his, he intensified the kiss even further. He began to kiss her over and over again, attacking her mouth relentlessly, sucking and devouring her lips and tongue fiercely, again and again and again, drowning her in pleasure, marking her, and claiming this young, untouched body as his own property, just like he had done to her mother before her.