The Heroine is My Stepsister, and I'm her Final Boss-Chapter 128: Sin part 3

Her breath hitched, a low mutter escaping her lips. "You’re holding up... too well," she said, her voice a sultry mix of awe and wounded pride, tinged with the haze of ecstasy. He’d already unraveled her three times, his thick fingers coaxing waves of pleasure that left her trembling. Yet here he was, his hard shaft pulsing in her grip, unyielding, a relentless throb that refused to break.

The slick, wet sound of precum coated her hand as she stroked him, her fingers gliding along his length with deliberate, teasing slowness. Each movement was a dance of control and surrender, her touch faltering as desire coiled tighter within her. She couldn’t help but pause, her gaze locked on him, the heat between them crackling like a live wire.

"...a boy would have been satisfied with just the hand," Aiden murmured, his voice low, a slow thunder rolling beneath calm skies. "But a man..." His gaze pierced hers. "A man would never stop there."

Isabella tilted her head, lips parting in a breath she didn’t realize she was holding. That response—sharp, unexpected—cut through her composure like a knife through silk. Her smirk was slow, deliberate. The kind she used when she wanted someone to feel the edge beneath the velvet.

"I’m liking you more and more, Aiden." She stepped closer, her heel echoing against the marble. "Then let’s make a bet."

"A bet?" he repeated, more amused than surprised.

She circled him now, eyes dragging along the sculpted lines of his chest like a painter studying form. "Yes. If you can keep control—longer than ten minutes—you win. I’ll hand over the mage. The one you’ve been pretending not to ask about."

He stilled. "So you knew."

"Of course I knew." Her tone was laced with dry amusement. "Every noble in Berkimhum is scavenging for talent, especially the kind that comes wrapped in danger and mystery." She paused in front of him, voice dropping. "But."

He waited.

"If you fail," she continued, "you’ll be mine. Entirely. No more games, no more masks. You’ll serve me. As my personal butler. As my shadow. And yes, whenever I want your time... I take it."

There was no humor in her voice now. Just hunger, veiled by elegance.

Aiden didn’t flinch. He only exhaled slowly, as though accepting the terms of battle. "Then let me raise the stakes."

Her brow arched. "Oh?"

"If I last ten minutes... and you break before I do..." he took a step forward, close enough for her perfume to reach him—jasmine, smoke, and sin, "then you’ll serve me."

Her lips curled. "Serve you?"

He leaned in. "One day where you follow my every word. Where I give the commands. Not the Queen. Just the woman."

The challenge danced between them like a live flame. Isabella’s eyes narrowed—not in anger, but in fascination. No one had ever dared place her in check. No one had dared name her desire out loud.

And that was why, without blinking, she stepped back, fingers sliding into her green hair, twisting it into a tight ponytail with a swift, practiced motion. A visual promise of something more primal than power.

"Deal," she whispered.

He blinked. "Wait, you—"

She silenced him with a single look. The look of a woman who had conquered generals, not with armies but with nerve.

"You didn’t specify how we begin," she said, pride dripping from every syllable. "And I’m not a woman who waits for orders, Aiden."

The air thickened. The distance between them barely existed now. Her breath ghosted across his collarbone, her emerald eyes flickering with something ancient—lust, yes, but also something more dangerous. Possession.

"I told you," she said. "I start things. I finish them too."

Aiden didn’t respond. Not with words. Because whatever game they were playing—it had already begun.

And neither of them would walk away unchanged.

Her tongue darted out, locking onto the tip of his shaft—his python of a staff, thick and pulsing with need. It flicked against her face, a teasing brush of skin on skin, before she took control. She traced the swollen head with slow, deliberate swirls, tasting the salt of him, her breath hot against his flesh.

Aiden’s hands clenched at his sides, knuckles whitening as he fought the urge to grab her, to surrender completely. No no... hold... hold... hollllddd atlas,’ he chanted silently, his mind a battlefield of restraint and desire.

Then came the warmth—sudden, engulfing, irresistible. Isabella’s mouth closed over his tip, her soft wetness enveloping him in a furnace of sensation. Her lips stretched around his girth, slick and yielding, while her tongue pressed flat against the underside, coaxing a low, guttural moan from his throat. "...Fuck..."he rasped, the word escaping despite his efforts to cage it. His hips twitched, an involuntary thrust, but she held him steady, her hands gripping his thighs with a possessive strength.

She pulled back just enough to let her tongue dance along the vein that throbbed beneath his skin, her eyes never leaving his. "You like that, don’t you?" she purred, her voice a velvet taunt, thick with lust. "You’re so hard for me, Aiden—so desperate." Her lips glistened with saliva and his precum, a sight that made his chest tighten, his breath hitch.

She licked the underside of his shaft, slow and deliberate, before taking him back into her mouth, deeper this time. Her cheeks hollowed as she sucked, the wet slurping sound mingling with his ragged breathing, filling the room with their sin.

Aiden felt like he was unraveling. Her mouth was a paradox—soft yet relentless, warm yet searing. Each bob of her head drove him deeper, the tightness of her throat teasing the edge of his control. Her hands joined the assault, one stroking the base of his cock where her lips couldn’t reach, the other cupping his balls, rolling them gently between her fingers. A spark of pain flared as her nails grazed his sensitive skin, blending seamlessly with the pleasure that threatened to drown him.

"Isabella..." he groaned, his voice a strained whisper, his resolve crumbling. She chuckled—a low, throaty sound that vibrated against his shaft—and pulled back to look up at him. "Cum for me, Aiden," she commanded, her voice husky with desire, her lips hovering just above his tip. "Let me taste you." Before he could respond, she plunged down again, taking him to the hilt, her throat relaxing to accommodate his length. Her eyes watered, but she held his gaze, unyielding, triumphant.

His hands betrayed him then, tangling in her deep green hair, guiding her movements as his hips bucked. The tension coiled tighter, a spring wound to breaking. Her tongue swirled, her suction intensified, and the sounds—her soft moans, the wet glide of her mouth, his own desperate gasps—pushed him to the brink. ’Hold... hold...’The mantra faded, drowned by the rush of heat surging through him.

[Yggdrasil’s seeds are reacting]

With a strangled cry, he shattered. His body tensed, every muscle locking as he came, his cock pulsing in her mouth. Isabella swallowed greedily, her throat working around him, savoring the flood of his release. The taste—salty, bitter, uniquely him—filled her senses, and she hummed in satisfaction, her eyes locked on his as the waves of his climax subsided.

He slumped back against the wall, chest heaving, his hands falling limp at his sides. Isabella released him with a soft ’pop’, licking her lips with a slow, deliberate swipe of her tongue. "Delicious," she murmured, her voice a purr of contentment, her expression one of victory.

The taste lingere in her tongue, it tasted good, very good. Normally it should not have been. She didn’t know what but something was different about it, as she swallowed every bit and drop, like she wanted more.

She rose to her feet, her gown whispering against her skin, and leaned in close. Her lips brushed his, a fleeting kiss that let him taste himself on her tongue. "So...my new Slave," she whispered, before turning and gliding from the chamber, leaving him alone with the flickering candlelight and the lingering echo of her power. But she saw him, his lips clearly etched in smile as if he had won.

’...don’t tell me...’

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