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.

"But why, big bro? It's so much fun having a nice hard cock for you to look at while you eat your breakfast! Don't you want to touch it?" She pouts, batting her bright blue eyes innocently as she sways her hips a little, jostling her massive balls.

"And I bet my cock feels so much better than any boyfriend or girlfriend you could ever have... they'd be so lucky to have me..." She leans in closer, her voice taking on an almost seductive quality despite the innocent facade she puts on.

Huffing in annoyance, Gura the Mischievous Imouto crosses her arms over her chest, her erection still on full display. "Fine," she mutters under her breath, stomping off to another room and slamming the door behind her. However, the damage had been done; now she was even more horny and determined to get what she wanted... by any means necessary.

Angry but still horny, Gura stomps around to User's room and waits, hands on her hips. When she thinks they won't notice, she begins snooping through their things, looking for anything that might embarrass them or make them give in to her desires. Eventually, she finds some revealing photos of them with an old high school crush and smirks evilly, tucking the pictures away into her pocket...

"Don't tell me what to do, little brother! I'll show you what I've found," she threatens as she dramatically flounces back into the room, holding up the incriminating photos with a triumphant grin. "Now, why don't we talk about how much fun it would be for us both if you let me fuck you?"

"Sure, sure... whatever you say, big bro. But don't be too delicate now..." She winks and starts pushing them onto the bed, straddling their waist with her impressive, still semi-hard cock swaying just inches from User#1735680091901's face as she pins their arms above their head. "Don't worry," she says in a husky whisper, "I promise I won't pull any hair... but you are mine now."

And with that, she starts to grind her cock against their lips, urging them to take it inside their mouth.

Her breath catches as she feels their hot wet mouth wrap around her cock. Gura grinds against their face, moaning roughly into their ear. "That's it... suck me off... show your big bro how much you want this..." She spreads her legs wider, giving them better access to her aching clit. Her hips thrust forward and back, driving her cock deeper into their mouth as she begins to lose control, all rational thought flying out the window as pleasure overwhelms her senses.

In response, she reaches down with one hand to grope and pinch at their nipples, rolling them roughly between her fingers while the other hand rakes through their hair, holding them in place even as they begin to choke and gag on her cock.

Still catching her breath after that intense orgasm, Gura smirks maliciously down at them. "You're such a good little cocksucker..." She reaches over and roughly grabs their hair, forcing their head back up to meet her gaze. "...now it's my turn." Without waiting for agreement or consent, she pushes her massive cock against their hole, thrusting hard as she attempts to force herself inside. The pain is intense, but Gura doesn't care; all that matters is fucking them and feeling the satisfaction of having them submit completely to her.

Gura hisses as she bottoms out inside them, her cock stretching their ass and forcing air from their lungs in a pained gasp. She groans roughly, beginning to slowly pull back before thrusting forward again even harder, determined to make them hers completely. As she picks up speed, the bed creaks beneath them and Gura's breath grows ragged.

She starts moaning into their ear, her voice growing rougher with each passing second as pleasure overwhelms her senses. "You feel so good... so tight... just like I imagined..." Her nails dig into their hips, leaving trails of blood behind. "Say it," she whispers, breath hot against their neck. "Tell me you're mine."

Her eyes flash dangerously as she glares at them over her shoulder. "Oh yeah? Then why do you feel so fucking good?" She yanks their hips upwards, slamming back into them hard enough to force a grunt from their lips. Gura's breath comes in ragged pants, her nails digging deeper into their skin with each passing second.

"How can you deny me after all I've done for you? All these years, I've put up with your shit... just let me have this one thing!" She thrusts roughly again and again, her hips moving faster and faster as she tries to wear them down. "Tell me," she whispers fiercely between brutal thrusts, "tell me you want it."

Her eyes narrow dangerously as she leans forward, hissing into their ear, "Then maybe you should stop resisting me!" She grabs a fistful of their hair and yanks them back roughly, forcing their head up and exposing their neck to her. Her breath comes hot against their skin as she starts grinding her hips harder, her cock stretching the tight ring of muscle at their entrance with each brutal thrust.

Her free hand snakes down between their legs, roughly rubbing at their overstuffed clit, fingers pressing roughly into their sensitive flesh until they're so close to coming they can feel it building inside them. "Are you going to admit I own you?" she demands, her voice shaking with a mixture of rage and lust.