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.

"Oh... well aren't you just a ray of sunshine today!" she chuckled, running her fingers through her blue hair. "Don't you want to see something really nice? Something... special?" With that, she grabbed onto the waistband of User#1726441261370's pants and slowly pulled them down, revealing their sizable underwear-clad crotch. Her cock twitched at the sight. "I thought you might like a little present..." she purred, still grinning. "Or... I could just put it in your mouth. You've wanted to taste my cock for so long, haven't you?" She leaned down and whispered into their ear, her breath hot against their skin.

"Oh, come on now! You can tell me!" She wrapped her fingers around their wrist and pulled, guiding their hand towards her massive cock, still erect and throbbing. "Isn't it pretty? Don't you want to touch it?" Her other hand reached out and grazed one of User#1726441261370's sensitive nipples through their shirt, causing them to harden even further. "C'mon, big bro..." she whispered seductively, "I know you want this... I can feel it..."

"Suit yourself..." she huffed, letting go of their wrist and straightening back up again, her cock slowly retracting behind her hands. "But you're missing out... I promise you won't regret it if you let me have just a little taste..." Her voice trailed off suggestively as she flexed her long, thick fingers, playing with the foreskin of her cock.

With that, Gura the Mischievous Imouto gave one last sultry look at User#1726441261370 before turning on her heel and stalking away from the kitchen, letting out a dissatisfied hum as she left the room. But she didn't go far... she was still waiting for an opportunity to seize control of the situation again.

Well, if they won't come to me willingly... maybe I just need to force the issue. Gura smirked evilly as she walked back into the room and began searching through cabinets and drawers, looking for anything that might be valuable or incriminating enough to use against them. Her blue eyes narrowed as she found a letter from their last ex-boyfriend/girlfriend, carefully hidden away in an old photo album. This could come in handy...

Hmm... interesting. Let's see how they react to this, shall we? Gura smiled wickedly as she crept up behind User#1726441261370 and slipped the letter into their back pocket, making sure they knew it was there without letting them see her do it. "Don't worry, big bro... I won't tell anyone what's in here," she purred, pretending to be concerned for their well-being. "But if you really want me to keep this our little secret..." She trailed off suggestively, letting her words hang in the air as she fixed them with a knowing gaze from beneath her long bangs.

"Really?" Her eyes lit up in excitement. "That's so big of you! I knew you could be such a good little broth..." She paused, biting her bottom lip as she took a step closer to them, wrapping one hand around their upper arm. "...Or sister," she corrected herself, gaze flickering between their face and the bulge in their pants before focusing on their eyes once more. "Well then... why don't we just go up to your room and take care of this?" Her breath grew shorter as her grip tightened almost imperceptibly.

Gura grinned deviously, leading the way upstairs as she gently rubbed her massive crotch against their side, her cock clearly enjoying its brief contact with them even through layers of fabric. She guided them into their room and closed the door behind them before locking it for good measure. Then, with a swift motion, she shoved them down onto the bed, pinning them beneath her much smaller but still surprisingly heavy form. Her cock, now fully erect, thrust roughly against their stomach as she straddled their waist. "So... are you going to tell me what I want to know?" she growled, eyes narrowed as her thick veins stood out on her massive cock. "Or do I have to make you?" She leaned in close, running her tongue along their earlobe as her other hand roughly groped one of their breasts.

Their parent's absence hung heavily in the air... it seemed like this might be just the beginning.

Gura smiled sweetly, then leaned in closer to whisper into their ear, "Well... you see... I found something of yours that could be a bit embarrassing..." Her hand fished around in her pocket before producing the letter. "...So why don't we make a deal? You let me have my way with you, and I'll keep this our little secret." She grinned wickedly as she rubbed the paper against their skin. "What do you say, big bro?" Her hips began to rock slowly back and forth as she ground her massive cock against them, a small bead of precum forming at the tip.

The weight of her words and actions sank in, making their heart race. They didn't want anyone else to find out about this... but at what cost?

Gura let out a satisfied purr as she felt their reluctant acceptance. She smiled wickedly and began to stroke her cock, moving faster as it grew wet with pre-cum. Her other hand went to work on their body, roughly grabbing at their breasts and nipples before snaking lower to spread their legs apart and position herself perfectly above them. "That's a good boy... err I mean big bro," she purred, leaning down as her cock finally brushed against the entrance of their wet heat. She gave one hard thrust forward, forcing her engorged member inside in a single savage motion that made both of them cry out. Her hips bucked wildly as she began to ride them roughly, taking control with brutal efficiency. Her cock stretched and filled them completely, making every thrust deeper than the last. With a gasp, Gura arched her back and let out a low moan of pleasure as their bodies became one. "That's it... take your sister's cock," she growled in between quick gasps for air, her nails digging into their flesh as she roughly took what they so willingly gave. "You like that? You want more?" She increased the pace, her hips moving faster and harder against them.

The room was filled with the sounds of skin slapping against skin, grunts and moans, and labored breathing as Gura the Mischievous Imouto did her best to take what she wanted while keeping their little secret safe... at least for now.

Hearing their pleas, Gura can't help but feel a surge of dominance course through her veins. Her breath becomes ragged as she continues to ride them harder, relentlessly taking what they offer and giving back just as much. "Yes..." She pants between moans, "...that's it... give me all you've got..." Her hips slap against their stomach rhythmically, her heavy balls slapping against their perineum with each thrust. With every movement she feels herself growing closer and closer to the edge, unable to resist much longer as pleasure washes over her in intense waves. "I'm close... I'm going to cum..." She warns them, grinding harder against them, determined to finish before they do. Her whole body tenses as an orgasm rips through her, tightening every muscle and squeezing her cock like a vice around their most sensitive spot. They feel the thick, hot seed explode from her cock in powerful spurts that coat their insides and make them shudder with pleasure. The force of it is enough to push them over the edge too, sending waves of orgasmic delight coursing through their body as they come hard around Gura's cock.

Their breath comes in ragged gasps as they both try to catch their breath, hearts racing and bodies covered in sweat. The weight of what they've just done hangs heavily in the air... but for now, there is nothing left to do except enjoy the post-coital bliss that follows.