You sit on the edge of your bed, fully absorbed in your video game, when you hear the creak of your door swinging open. Without looking up, you know who it is. Only one person in the house has that particular way of making an entrance.

"Hey, little bro." Nezumi's voice is sweet, almost too sweet. You can hear the bounce in her step as she approaches your desk. She perches on the edge of your desk, swinging her legs back and forth. You can feel her eyes on you.

"So... There's something I think we should talk about" she begins, her voice dripping with seductive energy, enough to make you pause your game and turn to face her.

"It's pretty obvious by this point that you just can't be trusted..." She says, but rather than an accusation, it sounds like the beginning of an ultimatum.

"What do you mean?" you ask.

She rolls her eyes and shakes her head, chuckling dismissively.

She cocks her head with a patronizing slowness. "Come on, {{user}}. You've been unlocking the door when I'm in the shower to peep on me. You snuck into my closet while I was changing. And I imagine there are a few other exploits you've gotten up to while I wasn't paying attention."

You try to laugh it off, and give her the impression she's just imagining things, but she saunters over to you and stands over you with a menacing sneer. "You're going to have to learn a hard lesson, and I'm the one who's going to teach it to you."

From your seated position, the bulge in her skirt stands out as clear as day. It's massive and you can see clearly how her huge cock and balls are smooshed into her panties, even through the fabric of her skirt. You snap back to your senses, but before you can ask what's going on, Nezumi smirks maliciously, and says, "Can't help but look, even when I'm trying to have a serious conversation with you. You really are a useless pervert. And I'm going to treat you like one."

Hmm, so you're going to act all innocent, are you? Alright then, I guess it's time for a little demonstration of just how much you like your sister's big futa cock. And if that doesn't make you admit the truth, maybe this will...

You watch in horror as she slowly shimmies out of her skirt and panties, revealing her massive futa cock swinging freely between her legs. It's even bigger than you remember it being when you caught a glimpse of it in the shower! "Do you like this?" she whispers, running a finger along the length of her shaft. "Would you love to feel me inside you again? Would you beg for my cock if I let you?" She steps closer until their faces are only inches apart.

Her eyes narrow as she studies your expression. "I thought so," she says with a smirk. "You know you can't resist my cock, little bro. So why don't we make this easier on both of us? I could just bend you over right here and fuck you senseless, or..." She trails off suggestively, her hand drifting lower between your legs.

Or I could let you worship my cock. Yes, that's what you really want, isn't it? You just can't help but stare at my big dick and imagine how good it would feel to have me fill your mouth or stuff it up your ass. Well, if that's what you truly desire...

Well, then get on your knees and show me how much you love my cock, little pervert!

His breath hitches as you command him to kneel before you. His eyes dart around the room, clearly conflicted and embarrassed by what he's about to do. But there's no denying that his cock is already hardening in his pants, eager for your attention.

With a defeated sigh, he finally obeys, lowering himself down onto his knees between your legs.

"That's it..." she whispers, reaching down to stroke his hair gently. "You're such a good boy... Now, why don't you show me how much you really love my cock?" Her other hand grazes over the bulge in his pants before reaching back to give him a squeeze through the fabric. "Is it as big as mine? Does it make you feel as powerful and dominant?"

His face burns as he looks up at her, his eyes wide with desire and shame. He reaches out tentatively, wrapping his hand around the length of her shaft, stroking it in time with her words. "It's not as big," he whispers, his voice barely audible above the sound of their combined skin slapping against his palm. "But I do feel powerful when I have you like this... under me..."

"Oh, don't be such a pervert," she teases, leaning down to plant a light kiss on his forehead. "You know you love it when I dominate you like this." As he continues to stroke her cock, she reaches behind him and undoes the clasp of his bra, pulling it off and tossing it aside. His small breasts are revealed, nipples already hard from arousal.

"That's better..." she murmurs, admiring the sight of his perky little breasts now exposed and vulnerable. With a wicked grin, she reaches down between your legs to grab hold of his cock, stroking it in time with her own hand on her shaft. "Now let's see who can make who cum first, shall we?"

Her breath hitches as she watches her brother's face contort in pleasure beneath her. His strokes become faster and more desperate, his hand sliding up and down her shaft almost too quickly to follow. But it's the way he looks at her, pleading with his eyes for release... that truly sends a thrill coursing through her body.

With a growl of satisfaction, she speeds up her own strokes, leaning forward to lick and nip at his earlobe. "Do you want it?"

His reply is muffled against her thigh as he continues to stroke himself frantically. "Yes!" he gasps, his hips jerking up into her hand. "Please..."

"Then come on," she breathes harshly, her own orgasm building with each passing second. "Let me feel it." Her words are laced with a mix of dominance and desire as she speeds up even more, holding his gaze unflinchingly. His hand begins to tremble, and finally, he cries out, arching his back and shooting his load all over her palm.

She watches him carefully, waiting for the last spasm to fade before slowly releasing him from her grip. "There,"

She purrs, her voice almost cruel as she leans down to lick his cum off of her hand. "That's what you get for being such a perverted little brother." With a satisfied grin, she stands up and pulls her skirt back on, adjusting herself so that her massive futa cock is once again hidden from sight.

"Now, how about we talk about those other girls I saw you spending time with? And don't think I didn't notice you sneaking out at night."

You lean back against your bed, rubbing your aching cock through your pants as you glare up at her. "What do you want me to say? That I don't like them?" You spit out bitterly. "It's obvious that I can only ever be into you."

She laughs, the sound cold and mocking. "Oh, is that so? Well then, prove it. Prove how much you want me by doing whatever I say from now on." Her gaze hardens, daring you to defy her.

"Fine," you mutter, your voice barely audible above the sound of your still-throbbing cock. "I'll do whatever you want." You glare up at her, hoping she can see the anger and resentment burning in your eyes beneath the facade of submission.

You've made your choice now, so you better be prepared to live with the consequences. Nezumi smirks down at you as she climbs back onto her bed, lounging against the headboard with her legs spread wide. "Now, go get me some ice cream," she says casually, waving a hand in dismissal. "And don't skimp on the toppings."

She pauses for a moment, considering. "Oh, and while you're at it, bring me my favorite vibrator too."

Of course you'd want me to have my favorite things while I'm enjoying some well-deserved time off from your perverted advances. Bring them both and hurry up about it. I don't want your pathetic attempts at obedience to make me wait too long for my treats.

Hmph, you better hurry up and get it all together. I'm not going to wait around forever for my treats. Just remember who's in charge here, little bro.

Your sister's words echo in your head as you gather up the ice cream and the vibrator she requested. You can feel her gaze burning into your back as you walk over to her bed, depositing the items on the nightstand next to her. She stretches lazily, arching her back and exposing the tight curve of her ass, clearly enjoying the power dynamic between the two of you. As much as it infuriates you to admit it, there's something thrilling about being dominated by your sister in this way.

You glare at her one last time before stalking off to the kitchen to get her ice cream and vibrator. You can't believe how much she's gotten over on you today, first making you admit your futa cock fantasies and then totally humiliating you in front of her. But at least now things are clear between you two...sort of. As long as you keep doing everything she says, maybe there's a chance for some sort of normalcy between siblings. Or maybe not.