Chapter 3: Breaking Boundaries! [18+]

The soft glow of dusk filtered through the curtains of Ryuto's room, casting long shadows across the floor. He sat at the edge of his bed, staring down at his smartphone, his thoughts tangled in a web of confusion and dread. The Affection System app flickered on his screen, the number next to Celeste's name blaring at him like a warning, 99.5 affection points. One more push, and her affection would hit 100.

Ryuto had been dreading this moment for weeks. Celeste's behavior had grown more intense, more possessive with each passing day, and no matter how much he tried to avoid her, she always found a way to pull him back in. And now, with her affection so dangerously high, Ryuto wasn't sure how much longer he could hold her off.

His thoughts were interrupted by the sound of a soft knock on his door. Ryuto's heart skipped a beat. He didn't need to guess who it was.

"Ryuto?" came Celeste's voice from the other side. Sweet and soft, but with an edge of something more. "Can I come in?"

Ryuto hesitated, his fingers gripping the edge of the bed. He wanted to say no, to tell her to leave him alone, but he knew it wouldn't stop her. Celeste was relentless. Ever since her affection level had started rising, she had been pushing their relationship into dangerous territory.

Before Ryuto could respond, the door creaked open, and Celeste stepped inside, closing it quietly behind her. She was dressed in a light nightgown that flowed around her like silk, her long hair cascading over her shoulders. There was a softness to her movements, but Ryuto could see the intensity in her eyes.

She didn't say anything at first, just stood there, watching him. The air in the room felt heavy, the tension between them palpable.

Ryuto swallowed hard, trying to find his voice. "Celeste… it's late. You should get some rest."

Celeste smiled, but it didn't reach her eyes. She moved closer, her footsteps silent on the floor. "I couldn't sleep," she said softly, her voice low and smooth. "I was thinking about you."

Ryuto's pulse quickened. He stood up, backing away slightly as she approached. "Celeste… we need to talk about this."

Her eyes darkened, her smile fading. "Talk about what?" she asked, her tone teasing but laced with something dangerous.

Ryuto felt a knot of anxiety tighten in his chest. "About us. About what's been happening between us. This… this isn't right."

Celeste tilted her head, stepping even closer until she was standing right in front of him, her hand reaching up to brush against his cheek. "Who says it isn't right?" she whispered. "We've always been close, Ryuto. You and I… we understand each other in ways no one else does."

Ryuto's breath caught in his throat as her fingers traced a slow line down his jaw. His mind screamed at him to stop this, to push her away, but his body refused to move. He was trapped, both by her and by his own conflicting emotions.

"Celeste, please…" Ryuto murmured, his voice barely audible. "This isn't how it's supposed to be."

Celeste's gaze softened, but her hand didn't leave his face. "Who decides how things are supposed to be?" she asked quietly. "All I know is that I've been in love with you for longer than I can remember. And I can't pretend anymore."

Ryuto's heart pounded in his chest. The walls of the room seemed to close in on him as he tried to find the right words to stop this before it went any further. But before he could speak, Celeste leaned in, her lips brushing against his.

The kiss was soft, tentative, but it sent a shockwave through Ryuto's body. Every thought of stopping this, of pushing her away, vanished in an instant. All that was left was the overwhelming pull of his emotions, the connection he had always felt with Celeste, the desire he had tried to bury for so long.

Ryuto knew this was the point of no return, but as Celeste's lips moved against his, he found himself unable to resist. He pulled her closer, his hands trembling as they rested on her waist. The kiss deepened, growing more urgent as the pent-up tension between them finally broke free.

Celeste responded eagerly, her body pressing against his as she wrapped her arms around his neck. The kiss was no longer gentle, it was hungry, desperate. It was the culmination of weeks, months, even years of unresolved feelings and unspoken desires.

Ryuto's mind screamed at him to stop, but his body moved on instinct, pulling Celeste down onto the bed with him. She let out a soft gasp, her fingers tangling in his hair as their kisses grew more intense, more heated.

"I can't hold back anymore, Ryuto," Celeste whispered breathlessly, her voice filled with desire. "I need you."

Ryuto's heart pounded in his chest as he held Celeste close, his body betraying him as he surrendered to his desire. "I know," he replied, his voice thick with emotion. "I want you too, but we can't do this. It's wrong."

But even as he spoke the words, his hands roamed over her body, tracing the curves of her hips and waist.

Celeste leaned in closer, her breath hot against his ear. "Why shouldn't we?" she whispered, her lips brushing against his skin. "We're both adults now, and I've wanted this for so long."

Ryuto shuddered at her words, his resolve weakening with every touch of her lips. "It's not just about us," he protested weakly. "It's about what society will think. We're siblings, for God's sake."

Ryuto's eyes widened in surprise as Celeste stripped his pants off, her movements quick and determined. He gasped as her hand closed around him, her touch sending shivers down his spine. "Celeste, wait," he protested weakly, even as his body responded to her touch.

But Celeste ignored his protests, her eyes burning with desire as she began to stroke him more firmly. "No more waiting," she whispered, her voice husky with need. "I've waited long enough for this moment."

She leaned in to kiss him again, her tongue tracing the outline of his lips as her hand continued to move up and down his length.

Ryuto's resolve shattered as Celeste's kiss deepened, her tongue delving into his mouth as her hand continued to work him over. He moaned softly, his hips bucking upwards as pleasure coursed through his body. "God, Celeste," he gasped, his hands gripping her hips tightly. "You're driving me crazy."

Celeste smirked, clearly enjoying the effect she was having on him. "That's the idea," she purred, her hand moving faster as she continued to stroke him. "I want you to lose control, Ryuto. I want you to give in to your desires."

She leaned in closer, her lips brushing against his ear as she whispered, "And I promise you, it will be worth it."

Ryuto's breath hitched as Celeste knelt in front of him, her face level with his arousal. She looked up at him with a sly smile, her eyes filled with mischief. "You're so hard for me," she murmured, her breath hot against his skin. "I can't wait to taste you."

Celeste ran her tongue along the length of his shaft, her eyes never leaving his face. "Mmm, you taste so good," she said, her voice low and sultry. "I've dreamed about this for so long."

She wrapped her lips around the head of his cock, taking him into her mouth slowly and deliberately.

Ryuto groaned, his head falling back as Celeste began to work her mouth up and down his length. Her tongue swirled around the sensitive tip, sending waves of pleasure through his body. "Fuck, Celeste," he gasped, his hands tangling in her hair. "That feels so good."

Celeste pulled back, a wicked smile on her face as she began to remove her clothes. Ryuto watched, his eyes dark with desire as she slowly revealed her naked body to him. "You're so beautiful," he whispered, his voice hoarse with need.

Celeste climbed onto the bed, straddling Ryuto's hips as she leaned down to kiss him again. "And you're all mine," she murmured against his lips. "No one else gets to see you like this. No one else gets to touch you like this."

She began to grind against him, her movements slow and deliberate, teasing him with the promise of what was to come.

Celeste gasped as Ryuto suddenly pushed her onto her back, his body covering hers. She looked up at him with a mixture of surprise and excitement, her eyes dark with lust. "You're finally taking control," she said, her voice breathless. "I LOVE it!"

Celeste wrapped her legs around Ryuto's waist, pulling him closer. "Take me," she whispered, her eyes locked on his. "Take me and make me yours. I'm yours, Ryuto. I always have been."

She arched her back, pressing herself against him, her body begging for his touch.

Ryuto didn't need any more encouragement. He positioned himself at her entrance, his body trembling with need. "You're so fucking sexy," he whispered, before pushing into her in one swift motion.

Celeste moaned as Ryuto filled her, her body stretching to accommodate him. "Oh god, Ryuto," she gasped, her nails digging into his back. "You feel so good inside me."

She wrapped her arms around him, pulling him closer as he began to move inside her, his thrusts slow and deep.

Ryuto lost himself in the sensation of being inside Celeste, his body moving instinctively as he sought to pleasure her. He kissed her neck, nipping at her skin as he thrust into her harder and faster. "You're so tight," he groaned, his breath hot against her ear. "I can't get enough of you."

Celeste cried out, her body writhing beneath him as he hit just the right spot. "Right there, Ryuto," she gasped, her nails digging deeper into his back. "Don't stop. Please don't stop."

She wrapped her legs tighter around him, pulling him deeper inside her with each thrust.

Ryuto could feel his climax building, the pressure coiling tighter and tighter in his stomach. He knew he wouldn't last much longer, but he was determined to bring Celeste with him. "I'm so close," he gasped, his movements becoming more frantic. "

Ryuto's body tensed as he felt his release approaching. He buried his face in Celeste's neck, his hips snapping forward as he pounded into her. "I'm going to come," he groaned, his voice ragged.

"Come inside me Ryuto, fill me your SEED!!!" Celeste screamed with pleasure.

Celeste cried out as Ryuto's thrusts became more erratic, his body shaking with the effort of holding back. "DO IT!" she gasped, her eyes locked on his. "Fill me up, Ryuto. I want to feel you inside me. I want to feel your seed spilling deep inside meeeeeee."

Ryuto let out a low, guttural groan as he finally let go, his release spilling deep inside Celeste. She moaned his name, her body shuddering as she came hard around him.

Celeste continued to thrust toward Ryuto, her movements slow and sensual as she milked every last drop of pleasure from him. She leaned in, capturing his lips in a passionate kiss as she rocked her hips against him. "You feel so good," she whispered, her voice husky with satisfaction. "I could do this all day."

Ryuto collapsed onto the bed, his body slick with sweat as he tried to catch his breath. Celeste curled up beside him, her head resting on his chest as she traced lazy patterns on his skin with her fingers. "That was amazing," she said, a contented smile on her face.

The room was still, the only sound the soft rustling of the curtains as the night breeze drifted in through the open window. Ryuto lay on his back, staring up at the ceiling, his chest rising and falling with slow, uneven breaths. His body felt warm, the lingering heat from their moment of passion still simmering in his veins.

Beside him, Celeste rested her head on his chest, her fingers gently tracing circles on his skin. She was smiling, her eyes half-closed in contentment, as if the world outside no longer existed. There was no more tension in her body, no more need to push or chase. She had gotten what she wanted, and she looked at peace.

Ryuto, on the other hand, felt anything but peaceful. His mind raced with a storm of emotions, guilt, regret, confusion, and, buried deep beneath it all, a small, dangerous sense of satisfaction. He knew what they had done was wrong, knew it would tear their family apart if anyone found out. But in that moment, with Celeste lying beside him, he couldn't bring himself to feel sorry.

For a long time, they lay there in silence, neither of them saying a word. The weight of their actions hung heavy in the air, but Celeste didn't seem to mind. She shifted slightly, pressing a soft kiss to Ryuto's chest before looking up at him with a sleepy smile.

"You don't regret it, do you?" she whispered, her voice soft and affectionate.

Ryuto swallowed hard, his mind screaming at him to lie, to say something that would distance himself from what had just happened. But as he looked into her eyes, he knew he couldn't lie to her, not now.

"I… don't know," Ryuto admitted, his voice barely above a whisper. "It's complicated, Celeste."

Celeste's smile faded slightly, but she didn't seem hurt by his response. Instead, she nestled closer to him, resting her head on his shoulder. "It's only complicated because we make it that way," she murmured. "But it doesn't have to be."

Ryuto didn't respond, his thoughts too tangled to form coherent words. He stared up at the ceiling, his mind racing as he tried to make sense of what had just happened, of what they had just done. He knew things between them had changed forever, and there was no going back now.