The old family house creaked under the weight of summer heat as Elena pushed open her brother's bedroom door. At twenty-three, she had always been the steady one, the older sister who fixed problems with sharp wit and unflinching honesty. Marcus, nineteen and restless, sat on the edge of his bed, eyes bright with a mix of nerves and determination. "Elena, I need your help," he said, voice steady but laced with that familiar sarcasm they traded like currency. "I want you to nullify me—make me your younger sister. Hormones, clothes, the whole thing. No more pretending I'm the guy in this family."
Elena leaned against the doorframe, arms crossed, her dark hair tumbling over one shoulder. "Nullify? That's a hell of a word for turning my cocky little brother into a girl. You sure about this, or is this another one of your horny midnight fantasies?" She smirked, stepping closer, the tension already crackling between them like static. Marcus had always been bold, but this request stripped away the usual banter, leaving something raw and electric.
"Dead serious," he replied, standing to meet her gaze. "I've thought about it for months. You know how to handle things no one else does. Help me start—tonight." His words hung heavy, and Elena felt a familiar heat stir, not just from the idea of transformation but from the way his eyes lingered on her. She was strong, always in control, and she wasn't about to let this turn submissive.
"Alright, little brother," she said, voice dropping into a teasing drawl. "But if we're doing this, we do it my way. First, we test how serious you are." She closed the distance, her hand brushing his chest, feeling the rapid beat of his heart. The air thickened with unspoken want, witty jabs giving way to heavier breaths. "You think you can handle your big sister taking charge?"
Marcus grinned, though his voice wavered with building arousal. "Try me. I've been horny thinking about this—about you guiding me." Elena laughed, sharp and genuine, then pulled him into a kiss that ignited everything. Clothes shed in a rush of fabric and laughter, their bodies pressing close. She guided him to the bed, her fingers tracing his hardening cock, already thick and eager. "Look at this hard thing," she murmured, stroking it with confident pressure. "We'll make sure it behaves for your new life."
She straddled him, strong thighs pinning his hips, her pussy already wet and dripping with anticipation. "You want to be my sister? Then show me you can please like one." Marcus groaned, hands roaming her ass as she lowered herself, taking his cock deep inside her. They moved together in a rhythm of panting and sweat-slick skin, Elena riding him with fierce control, her witty taunts mixing with moans. "Harder, little brother—prove you're ready to change." He thrust up, their bodies slapping, her pussy clenching around him as pleasure built.
The climax hit like a storm: Elena came first, crying out as waves of ecstasy rolled through her, her juices dripping down his shaft. Marcus followed, his cock pulsing as he came hard, cum spilling inside her while they both panted, sweating in the afterglow. She didn't yield dominance, rolling off only to pull him close, whispering plans for hormones and skirts. "This is just the start," she said, voice husky. "Tomorrow, we shop for your new self."
Marcus lay there, transformed already in small ways by the intimacy, his mind racing with the promise of more. Elena's strength anchored the moment, turning his request into something shared and electric. The night stretched on with soft touches and lingering kisses, the house silent except for their slowing breaths.
But as dawn threatened, Elena's final words lingered like a spark: "Just wait until the family finds out their new daughter."
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