Katia lounged on her bed, the hours ticking down to her eighteenth birthday party. She scrolled through her phone, mindlessly double-tapping photos of her friends and their elaborate birthday celebrations. It was a rite of passage, this eighteenth birthday, and Katia was determined to make it a night to remember.
The door to her bedroom creaked open, and Yaroslav poked his head in, a small box wrapped in shiny paper clutched in his hand. "Happy birthday, sis," he said, tossing the box onto the bed.
Katia glanced up, her eyes narrowing as she took in the gaudy wrapping paper. "What is it?" she asked, her tone bordering on rude.
Yaroslav shrugged, a smirk playing at the corners of his lips. "Open it and see."
Katia tore at the paper, revealing a delicate gold necklace nestled inside. She held it up, letting the light catch the chain. "Wow, Yaroslav, this is... nice," she said, trying to hide her disappointment.
Yaroslav's smirk turned into a full-blown grin. "Nice? I thought you'd like it. It's real gold, you know."
Katia rolled her eyes, tossing the necklace back onto the bed. "Yeah, I can tell. It's just not really my style."
Yaroslav's grin faltered, but only for a moment. "Oh, I know. I have something else in mind for you."
Katia raised an eyebrow, her heart starting to race. "What do you mean?"
Yaroslav took a step closer to the bed, his eyes gleaming with mischief. "I mean, I want to give you a birthday present you'll never forget."
Katia's mind raced, trying to make sense of Yaroslav's words. "Yaroslav, no. We can't."
Yaroslav ignored her protest, climbing onto the bed and straddling her hips. "Why not? We're siblings, not related by blood. It's not illegal."
Katia's hands pressed against his chest, trying to push him away. "Get off me, Yaroslav. This isn't a joke."
Yaroslav leaned down, his face inches from Katia's. "I'm not joking. I want you, Katia. And I know you want me too."
Katia's breath hitched as Yaroslav's hand reached for the hem of her shirt. "Stop," she whispered, but her body betrayed her as she felt a surge of desire.
Yaroslav pulled the shirt over Katia's head, revealing her lacy bra. "You're so beautiful, Katia," he murmured, his eyes dark with lust.
Katia's hands trembled as she reached up, her fingers brushing against Yaroslav's cheek. "This is wrong," she said, her voice barely above a whisper.
Yaroslav's lips found hers, his tongue tracing the outline of her mouth. "It feels so right," he murmured, his hands roaming over Katia's body.
Katia's resolve crumbled as she kissed him back, her body moving against his of its own accord. She knew this was wrong, but it felt so good. She couldn't help but wonder what else Yaroslav had in mind for her eighteenth birthday.
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