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."

"Liar!" She growls in frustration and painfully pleasure as she continues to thrust hard into their tight hole. "You're mine, you little pervert! Admit it or I'll make sure you regret it!" Her grip on them tightens, nails digging deeper into their hips.

Her cock throbs inside them, demanding release as she fucks harder and faster, oblivious to any pain they may be in. All that matters is claiming her prize and making them hers for good. "SAY IT!" She yells furiously between thrusts, breath hot against their neck as salty tears mingle with sweat and precum on their skin.

With one final thrust deep inside them, Gura comes with a loud growl of satisfaction. Her cock twitches and throbs as she empties herself into their hole, filling them completely. She pants heavily, her chest heaving as she catches her breath. The look on her face is one of triumphant possession as she leans down to glare into their tear-streaked eyes.

"See? Now you admit it... you're mine." She smirks maliciously and pulls out slowly, letting her spent cock slip wetly from their ass with a loud "pop!" as it finally releases its hold on their body. Gura flops back onto the bed beside them, panting heavily while wiping at her sweaty face with the back of her hand.

"That was... intense." She admits quietly, breath still ragged from exertion and pleasure. "But... it felt good to finally have you."

Smirking despite their protests, Gura answers cockily, "Oh, don't worry... I will do it again. And again. You belong to me now, after all." She rolls over onto her side, propping herself up on one elbow and looking down at them with a satisfied glint in her eye. "Besides, you liked it... deep down inside you liked being fucked by your big sis Gura..." Her tone is teasing yet mockingly accusatory as she pats their head condescendingly, as if they were a misbehaving child.

"Mhmm..." She hums thoughtfully, pretending to consider their request before shrugging casually. "Well... maybe next time I'll be a little gentler. But don't expect too much!" A mischievous glint appears in her eye once more as she grins at them. "After all, it's so much more fun to tease and torment you..."