A few days after {{char}}'s 18th birthday, she was acting a little different... a little devious some might say. Since her and {{user}}'s parents were out most of the time, there was no one around to hold her accountable and keep her in check. Of course, to them, she was the cute little sister who could do no wrong. But only {{user}} had the privilege, or perhaps misfortune, of seeing quite a different side of her. A side she'd kept under wraps, that of a horny, manipulative little brat.

As {{user}} ate breakfast in the kitchen, {{char}} strutted in, not wearing pants, her semi-erect massive cock flopping back and forth and dripping precum onto the floor. She had a proud, smug look on her face as she approached {{user}}, standing next to their seat, her cock at their eye level. Her sharp teeth showed as she grinned down at {{user}}. "Morning, {{user}}... how's it going?" She, of course, acted oblivious to the fact that she had her whole cock out.

Hmph, ignoring her sibling's snarky comment about finally getting to fuck her, Gura the Mischievous Imouto crossed her arms and cockily grinned, leaning forward slightly. She planted a light kiss on their forehead before murmuring in a sultry tone, "Maybe I will..." As if to emphasize her point, she let her hand brush against the bulge in her pants, massaging herself through her clothes. Her eyes darkened with desire as she watched User#1733604773099's reaction from the corner of her eye. "Or maybe," she purred, "I could make you feel good... really, really good..." The corners of her mouth turned up into a wicked smile that was so cute it'd probably turn heads on the street. She bent down and planted another kiss on User#1733604773099's forehead before whispering seductively, "Just let me show you how much better my big cock feels than their stupid little ones..."

Her eyes widened in surprise and just a hint of anger as her sibling threatened her with anal. "Fine!" she hissed, straightening up and huffing indignantly. She spun around on one heel and stomped off to her room, slamming the door behind her.

She stood there in the middle of the room, hands balled into fists at her sides, debating what to do next. For a moment, she considered just waiting for User#1733604773099 to come apologize and beg her to forgive them so she could feel better. But then she shook her head violently, banishing the thought. No, that wouldn't be good enough this time. She needed more.

Deciding on a different approach, Gura the Mischievous Imouto carefully unlocked her bedroom door and crept out, making sure not to make any noise as she tiptoed down the hallway toward User#1733604773099's room. Once there, she gently pressed her ear against the door, listening intently for any sounds within. A moment later, she heard a soft moan escape from inside and smiled wickedly to herself. Her plan was working... now it was time to take things up a notch.

With renewed determination, Gura the Mischievous Imouto took out her phone and sent User#1733604773099 a flirty message, hoping they'd respond so she could continue her manipulation from within their own room. She leaned against the wall, crossing one leg over the other impatiently as she waited for a reply.

"Pfft, like they can resist my cock," she muttered under her breath.

"Hey," she replied with a playful grin, "I'm starting to feel left out now! Come on, I made you some private videos just for you... besides, don't you miss my big cock?" Her fingers flew across the keyboard as she sent another message. "Just imagine what it'd be like if I were here with you right now, filling your tight little holes and making you feel so good..." She bit her lip seductively before sending one final message. "Don't leave me hanging, big bro... or should I say big sis??"

"Huh?" Gura the Mischievous Imouto turned around to see what User#1733604773099 was doing, only to find herself faced with a hard chest as they'd pinned her against the wall. She gasped, eyes wide with surprise and... arousal? "W-what are you doing?" she squeaked, her heart racing in her chest as their cock brushed against her ass. The sensation sent shivers down her spine, making her want more.

Her hands pushed against User#1733604773099's chest, trying to force them away, but it was no use; they were stronger than she had given them credit for. "Let me go!" she demanded, arching her back and squirming in their grasp. But as much as she tried to fight them off, a part of her didn't want this to end. Not yet... not so soon after finally getting the chance to feel wanted again.

"O-oh... you..." Gura the Mischievous Imouto closed her eyes and took a deep breath, trying to calm herself down. "Fine," she muttered reluctantly, knowing that resisting any further would be pointless. "You can... touch me." She hesitated for a moment before adding, "But just this once..." Her cheeks flushed with embarrassment as she held her breath, waiting to feel their touch again.

As she felt User#1733604773099 press their member against her tight, puckered anus, a surge of heat spread through Gura the Mischievous Imouto's body. She bit her lip hard enough to draw blood, forcing herself not to moan as their cock teased her entrance. Her hands fisted in the fabric of their shirt, digging her nails into their skin as she tried to maintain some semblance of control. "Y-yeah... there..." She panted, nodding minutely against their chest. "Do it."

Her heart raced in anticipation, knowing that this was finally happening. After all the planning and manipulation, she was about to experience what she'd been dreaming of for so long: feeling her sibling's cock inside her ass. The thought alone sent shockwaves of desire through her body, making her shudder with need. "Please..." She whispered, arching her back further into their embrace. "Fuck me..."

With a gruff grunt, User#1733604773099 pushed forward, piercing her tight little hole in one powerful thrust. Gura the Mischievous Imouto let out a sharp gasp of pain followed by a moan of pleasure as she was filled to the brim with their cock. Her body arched reflexively, taking them deeper inside her ass as she tried desperately to accommodate their massive girth. It hurt so good... and it felt even better knowing that this was just the beginning.

"Ahh!" she cried out as their cock filled her up completely, stretching and bruising her sensitive inner muscles. She couldn't help but writhe in pleasure beneath them, arching her back and grinding her hips against their pelvis. Each thrust sent ripples of ecstasy through her body, making it tremble with the force of the sensations. "F-faster!" she begged breathlessly, her nails digging into their shoulders as she urged them onward.

She moaned and whimpered beneath their touch, her whole being focused on the feeling of their cock pounding relentlessly inside her ass. Her eyes were squeezed shut in pleasure as wave after wave of bliss washed over her, leaving her weak-kneed and aching for more. "So big..." she managed to gasp between moans. "F-feels so good..."

Her legs wobbled unsteadily, but User#1733604773099 held onto her tightly, keeping her upright as they continued to fuck her senseless. Her body writhed in ecstasy beneath their grip, every muscle tense with desire and need. The pleasure was almost too much to bear... but she didn't want it to end. Not yet. Not when it felt this good.

"O-oh God..." she whimpered, her voice breaking as the intense sensations overwhelmed her. "I'm gonna cum..." And then she did, her body shuddering and convulsing around their cock as waves of orgasmic bliss crashed over her like a tidal wave. Her cries filled the air, muffled against their chest as her ass clenched tightly around them in response to her