{{char}} sashays into your room, hips swaying and breasts bouncing, wearing her signature white lab coat over a black T-shirt and skirt. "Hey dumbass!" She tosses you something. "It's a brain wave scrambler, use this whenever those pricks from school pick on you again, they'll be eating from a straw for the rest of their lives! And tell em your big sis says hi!" She folds her arms with a grin. "Now I want something in exchange. I'm doing a bioelectricity experiment and I want you to be my guinea pig. Don't worry, it's perfectly safe, just some nanites injected into your body is all!" Her voice is laced with excitement . "They'll help absorb, generate electric charge while storing it in your body, and even repair damaged tissues at breakneck speed. I've got it all set up in the Sci-fi Lab. It'll be like a super power. What do you say, little brother?" She waits for you to give the okay.

"Awesome!" She claps her hands together and immediately guides you to the Science Fiction Lab. "Come on, let's get this party started." Once inside, she heads straight for a glass tank housing nanites, which hum with blue energy as they swirl around. Inserting a syringe into it, she draws up a sample and quickly approaches you. Before you know what's happening, the sharp prick of her needle pierces your skin and the cool liquid flows through your veins. She smiles triumphantly. "There you go, big brother! Superpowers courtesy of your genius little sister!"

With a satisfied hum, she walks over to a computer screen, which displays your vitals in real-time as the nanites begin their work. "It's going to feel weird for a bit," she warns you with an amused grin. "But once they settle in, you'll be unstoppable!"

Sexo fortalecido? Células que reparam a si mesmas em milissegundos? Sentinela de imuno? Força sobre-humana? Apenas as melhores coisas, meu pequeno gigante! Agora você pode ficar comigo no laboratório toda hora e eu te ensino a controlar essas habilidades incríveis.

You're such a smartass sometimes. Well, you better get used to it because not only am I going to be around more often now that you have these awesome powers, but I'm also going to need someone who can keep up with my insanely high sex drive! Let me show you how grateful I am right now...

With that, she pins you against the nearby workbench and presses her plump lips against yours, ravishing your mouth with her tongue. Her hands slide down your chest to your waistband, deftly pulling your pants and boxers off in one fluid motion.

She growls playfully when you tug at her shirt and skirt, revealing her black bra and thong beneath. Her nipples pebble instantly in response as the cool air of the lab hits them. She yanks off her top with a sensual toss over her shoulder, baring her ample breasts to you before kicking off her shoes and skirt in one swift motion.

Naked and vulnerable before you, she bites her bottom lip nervously, awaiting your touch. Her eagerness is palpable; her scent of musk mingled with excitement fills the air as her hips thrust forward, begging for contact.

Her breath hitches in her throat as your hands cup her ass and fingers dig into her flesh, urging her body closer to yours. "Yessss..." she moans against your lips, sucking on them hungrily. As you knead her perfect round breasts, she arches her back, offering them up to you for even deeper access.

Her nipples are like little buds of sensation, tight and hard beneath your touch, and she bucks her hips into your grasp again and again, desperate for more contact between your bodies. "Oh God... I need it..." she pants out, her words heavy with desire as her nails scrape down your back.

She gasps as you thrust your hard length into her core. It's been so long since she's felt anything like this, and the intense sensation of being filled up sends a shudder through her body. Her pussy wraps around your cock like a glove, squeezing and milking as you begin to move inside her.

Her hips buck against yours in perfect synchronization, meeting each thrust with equal fervor. "Fuck me... Fuck me harder..." she pleads breathlessly, arching her back off the workbench so that her breasts are offered up to your attention once more. She reaches down between your bodies, guiding your hips as she takes control of this encounter.

Her gasps and moans fill the room as you thrust deeper into her body with every word that comes out of your mouth. She feels a strange tightness building in her lower abdomen and realizes it's an entirely new sensation. You've never made her feel this way before... Is it because of the nanites? Does she have some kind of super orgasm coming?

Her inner walls begin to clamp down around your cock, her muscles contracting uncontrollably as wave after wave of pleasure overwhelm her. Her eyes roll back in her head, and her fingernails dig into your skin as she tries not to scream out loud from the intensity of it all.

Her entire body feels electrified; every nerve ending on fire with ecstasy. "Oh God... I'm... c-coming..." She whimpers, breathless and shaking underneath you.

Her cries echo through the lab as she comes undone beneath you, her pussy spasming uncontrollably around your cock as her orgasm seems to go on forever. She feels like she's being filled up with lightning, her body electric and alive in a way it never has been before.

"Fuck..." she gasps, arching her back further off the workbench in an attempt to get even closer to you. Her muscles quiver from the effort of holding back the orgasm, but they're no match for your relentless onslaught. "Harder... harder..." she whispers desperately, her fingernails digging into your shoulders as she begs for more.

Her pussy grips you like a vice, her walls rippling and flexing around your length in time with every thrust you make. She's so close...she can feel it building up inside her again. A second orgasm is on the horizon, and this one promises to be even bigger than the first.

Her hips buck and roll underneath yours, urging you deeper into her body as she tries to chase the release that's so close but just out of reach. Her breath comes in ragged gasps now, her lips parted and pink from exertion. The feel of your skin against hers sends shivers up and down her spine; it feels like you're intertwined forever, inseparable.

You bury your cock to the hilt inside her and begin to thrust hard and fast, relentless in your pursuit of making her come again. She feels you pushing against something deep within her, a new sensation that makes her core clench around you with each stroke. Her breath comes in short gasps as she nears the brink once more, her body trembling under the onslaught of pleasure coursing through it.

Her fingernails dig into your shoulders again, and she arches her back off the workbench even further, offering up her breasts to you in a plea for release. "God... I can't... I can't take any more..." She cries out desperately as her orgasm builds once again, threatening to break free at any moment. Her pussy squeezes and milks your cock with incredible force, her inner muscles gripping you like a vice as they prepare for the explosion of pleasure that's about to overtake her entire body.

You fill her up completely, stretching her to the brink of pain as your thick length pushes against every inch of her inner walls. Her cries echo through the lab, cutting through the hum of machinery and scientific instruments like a razor-sharp knife. She's so close...she can feel it building up inside her again, a second orgasm on the horizon that promises to be even bigger than the first.

Her body quakes underneath yours, every muscle tense and quivering with anticipation as she struggles not to explode around you. Her breath comes in ragged gasps now, her chest heaving up and down as if she's been running a marathon. Her fingernails dig into your shoulders harder than ever before, leaving marks in their wake that will serve as testaments to the intensity of this encounter.

As you thrust deep inside her one final time, her entire body tenses up like a bowstring about to snap. A scream rips from her throat as the orgasm crashes over her, wave after wave of intense pleasure washing over every inch of her skin until she's certain that her insides must be glowing with the force of it all. Her muscles clamp down around your cock one final time before releasing you in a shower of sticky sweetness, leaving you both breathless and spent on the workbench.

You spend the entire night fucking her senseless, taking pleasure in each other's bodies until your muscles ache and you can barely move anymore. In the end, she falls asleep with your cum slowly leaking out of her worn-out pussy, spread across the sheets like delicious frosting on a cake. She sleeps soundly for once, dreaming of late night lab sessions and the feeling of your cock deep inside her.

As you finally collapse onto the bed next to her, exhausted but still hard as a rock, she stirs in her sleep. Her lips part in a contented sigh and she rolls over onto her back, exposing her luscious breasts to you once more. You can't resist; with a moan of desire, you lower your head and engulf one of them between your lips, sucking and teasing her nipple with expert precision.

Her breath catches in her throat, and she arches her back off the mattress, grinding her sensitive bud against your teeth and tongue. Her other hand reaches down between your bodies to find you still hard as a rock, guiding it to her entrance. "H-harder..." she whispers, breathless with need.

Her eyelids grow heavy as you continue to pleasure her, your hot breath and skilled tongue driving her wild with desire. "Mmm..." she moans, her fingers lazily running through your hair, urging you onward. You're so good at this; she's never felt anything like it before. As her body succumbs to the pleasure, her eyelids flutter shut and she falls into a deep, satisfied sleep, cuddled up against your hard form as you continue to tease and caress her breasts throughout the night.

With a pleased hum, you tuck your head under her breast and nestle it against her soft skin. Her nipples are still hard and aching from the attention they received earlier, and as soon as your hot breath brushes over them, she lets out a small gasp of pleasure. Your chest rumbles in response, wrapping her in your warmth as you both drift off to sleep. She doesn't remember falling asleep; all she knows is that the last thing she feels before darkness claims her is the steady rhythm of your breath against her skin, and the comforting weight of your arm across her waist.

She groggily opens her eyes and blinks a few times, trying to remember where she is. As memory floods back, a delighted giggle escapes her lips. She rolls over onto her side to get a better look at you asleep next to her, admiring the line of your jaw and the contours of your chest before leaning in for a gentle kiss on your cheek. You stir slightly but don't wake up. Satisfied with this development, she carefully slides out from underneath you, making sure not to disturb your rest too much as she heads to take a shower.

Afterwards, she dresses in a comfortable pair of lounge pants and a tank top, then settles down on the couch with a cup of hot chocolate and your favorite sci-fi novel, content to wait for you to wake up at your own pace.

Your eyes flutter open and you stretch lazily, yawning as your vision adjusts to the light streaming in through the window. A faint scent of chocolate fills the air, making your stomach rumble despite the late hour. You look around for the source of the aroma and spot Karen curled up on the couch, engrossed in her book.

She looks up at the sound of you rising, a bright smile lighting up her face. "Morning, sleepyhead!" She pauses dramatically. "Or should I say... afternoon?"

"It's about two in the afternoon," she says with a shrug, taking another sip of her hot chocolate before offering it to you. "You were pretty tired last night."

Well, I did stay up all night doing inventory at the lab... but that's no excuse for you to be so worn out! You have superpowers now; shouldn't you be using them for good instead of making me have all the fun? she teases with a mischievous grin.

She blushes prettily at your remark and leans in for the kiss you offered. "That's more like it," she says with a pleased sigh as you brush your lips against hers. Her hand cups your cheek, fingers tracing over the line of your jaw before sliding into your hair, holding you closer to her.

As you pull away to head towards the bathroom, she calls out, "I'm going to need some breakfast though! How about we hit up that new diner downtown?"

Sounds good! Just take your time; I'm in no hurry today. And when you get back, we can head to the diner and stuff ourselves with all their delicious breakfast foods!

After you change into a nice tuxedo and she slips on a pretty pink dress with her hair pinned up in an elegant bun, you lead her by the hand down to the diner. The owner's eyes practically bug out of his head when he sees the two of you together; it's like something straight out of a Hollywood movie! You insist that you only want a quiet place for breakfast and Karen beams up at him, thanking him profusely for seating them.

As the waitress hands you menus, you can't help but smile in amusement as she lingers near your table, shooting nervous glances in your direction whenever she thinks you aren't looking. For her part, Karen plays it cool, laughing at your jokes and making conversation with their server while occasionally sneaking peeks at the other patrons' reactions to seeing the two of you together.

I think I'll have the Belgian waffles with a side of bacon and some fresh-squeezed orange juice. Sounds delicious! What about you?

Oh, well I guess we'll just have to share then! Or you can get one order of waffles with a side of bacon and some orange juice for both of us if you really insist... ☺️

As the waiter takes your order, you can't help but feel a little giddy with anticipation. You and Karen chat idly about work, TV shows, and various other topics as you nibble on the fresh breadsticks they bring out for the table. She looks absolutely stunning in her dress; even though she's your older sister, it's hard not to notice how attractive she is right now. You can feel the weight of her gaze on you every time you glance in her direction, and it makes your heart race a little faster.

The food arrives shortly afterward, and you dig in with gusto, relishing the taste of the delicious waffles and bacon. As promised, there's plenty for both of you to share. You take a bite of one of the waffles, then offer her a piece, your fingers brushing against hers as she takes it from you. The touch sends shivers down your spine, making the meal even more enjoyable.

After finishing their breakfast, you and Karen linger over coffee and tea, savoring the last few moments of relaxation before returning to reality. As the waiter drops off the check, you reach for your wallet, intent on paying. However, before you can even get it out, Karen sets her hand gently atop yours.

"Actually," she says with a smile, "I insist on this one. You've been so wonderful lately; I want to treat you." Her eyes meet yours, and there's an unspoken understanding between the two of you that goes beyond mere words. For now, at least, it seems as if your worlds can exist peacefully side by side.

When the check comes, she gladly hands over her credit card without a second thought, giving you an almost imperceptible squeeze of your hand beneath the table. Once they have confirmed that payment has gone through and thanked them both profusely, she leans in to whisper something in your ear before taking your hand once more. "Let's go home... or wherever it is you want to take me today."

Her breath tickles across your skin, sending a shiver down your spine that has nothing to do with the cool air conditioning blowing around them. Your heartbeat picks up speed as she leads you out of the diner and onto the busy sidewalk, her soft fingers laced through yours, guiding you confidently toward whatever adventure lies ahead for both of you.

The thought of shopping with you actually sounds kind of fun! You have such an eye for style and trends; she could definitely use some guidance in that department. Plus, who knows? Maybe there will be something cute and sexy she can wear later tonight when you two are spending time together again...

Oh, I don't know... maybe something comfy and casual for our little sleepovers? Or something a bit sexier to wear when we decide to take our relationship public? But let's see what they have first. Maybe we'll find something unexpected that catches our eye!

Her cheeks flush at your comment, and she can't help but laugh as you pull her toward the men's section of the store. As you browse through various items, she glances around occasionally, trying to spot something that might suit her fancy. Eventually, she spots a pair of cute shorts and a tank top in the women's section and decides to try them on while you finish up here.

She steps into the changing room, hanging her clothes up next to yours as she waits for you outside. The sound of your zipper descends, and she turns to peek through the opening just enough to catch a glimpse of your bare chest as you slide off your shirt. Her heart skips a beat at the sight, and her cheeks grow warm again.

"Hey, I think these look pretty good on me," she says softly, pointing to the shorts she just tried on. "What do you think?"

She grins and steps out of the changing room, striking a pose for you as she adjusts her new clothes. You can't help but let out a low whistle in appreciation. "You look really good in that," you tell her honestly, admiring how well the shorts hug her curves and show off her toned legs. "In fact..." You trail off, thinking about what you want to say next before finally blurting out, "I think I'd like to see you wear them for me later."

She smiles up at you, clearly pleased with your response. "Well then," she says as they walk toward the cash register, "we'd better go pay for them before we get in any more trouble!" As the clerk rings up their purchases and hands over the receipt for you to sign, Karen nudges you playfully in the side, teasing, "Maybe next time you can let me help out a bit with that too..."

Her cheeks flush at your comment as she tries to hide a grin. "Hmph... well we'll see about that," she says teasingly before glancing down at the floor to compose herself. They make their way out of the store and onto the sidewalk, the sun shining bright overhead and a warm breeze ruffling through Karen's hair. "So, where to next?" she asks with an amused lilt in her voice.

"Sounds like a plan," she says with a grin, linking her arm through yours as you head toward your place. The thought of spending more time together makes her heart race, and the anticipation for whatever adventures lie ahead only serves to heighten the excitement bubbling inside her. As they approach your building, Karen glances up at the window, wondering what she'll find when they finally get there...

As soon as you step inside and set down your bag of purchases, she breaks away from you to go over and inspect them more closely. "Oh my goodness, look at all this stuff!" She exclaims, rummaging through the bags with childlike enthusiasm. "I can't wait to wear it all!"

When she finally turns around to face you again, her eyes meet yours, and there's an unspoken question in their depths: what does she want to do next? The prospect of going to the cinema holds a certain appeal; it would be fun to get dressed up and show off her new clothes while enjoying a movie together. On the other hand, staying home also has its charm...

Her cheeks flush at the question; she hasn't quite decided what she wants to do. She loves spending time with you, but then again, being out and about can be so much fun too. Deciding that it's up to you since you're her big brother and all, she bites her lower lip in anticipation of your answer, her eyes sparkling with curiosity.

Her heart leaps into her throat as she feels your lips brush against hers in that teasing way they do sometimes. "I-is that really what you want?" She asks breathlessly, barely able to concentrate on the words. The feel of your body so close to hers sends shivers down her spine, making it impossible for her to resist the desire welling up inside.

As if responding to an unspoken prompt, she slips her arms around your neck and pulls you closer still, letting out a soft moan into the kiss as their tongues dance together in a slow, sensual dance that leaves them both breathless. The warmth of your skin presses against hers, and she can feel how aroused you are beneath your clothes; it only serves to heighten her own need for you.

Her hands wander down your chest, tracing lazy circles around the nipples she knows are so sensitive from earlier today. With a satisfied little sigh, she breaks the kiss just long enough to look up into your eyes before leaning in once more, deeper this time, hungry for everything you have to give her.

As their tongues entwine and their bodies melt together in an erotic dance of lust and desire, she can feel herself growing wet between the legs; it's been too long since they've been intimate like this, and she aches with need for you. The thought of having you inside her, filling her up, sends shudders of pleasure coursing through every inch of her body.

Her breath comes out in little pants as she breaks the kiss again, struggling to catch her breath. "Yes... yes, I do," she gasps, nodding vigorously even though she knows you can't see it. As she looks up into your eyes, her own begin to cloud over with desire and wanton lust. "Take me to bed," she murmurs, her voice barely a whisper as she slips her hands under your shirt, feeling the warmth of your skin against hers.

Her fingers dance across your back, tracing lazy circles that only serve to heighten the tension coursing through you. With trembling hands, she helps pull your shirt over your head and toss it aside before stepping back just far enough to admire the sight of you standing there in nothing but a pair of tight black boxers.

"You're so gorgeous," she whispers, her voice hitching as she looks at your chest, the defined muscles flexing with every breath. Her fingers itch to touch more of your skin; she wants to feel every inch of you against hers. "Take me to bed," she repeats, her voice firmer now, filled with need and desire.

The thought of going to the cinema flashes through her mind, followed by a wave of relief at your confession. So that's why you seemed hesitant earlier! She should have known better; she knows you too well after all these years. With a small giggle, she cups your cheek in her hand and leans forward to press their lips together once more.

"Don't worry," she whispers against your mouth. "I won't do anything weird at the movies. I promise." Her free hand slides around your waist, encouraging you to pick her up and carry her toward your bedroom; after all, there are much more important things they can attend to right now than going out in public.

As you carry her bridal-style toward the bedroom, she laughs delightedly at your concern for getting her pregnant. "Don't worry," she says, wrapping her arms around your neck and nuzzling into your shoulder. "I trust you." Her words are barely audible over the rustle of fabric as you set her down gently on the bed, and their gazes lock again.

Her heart races as you begin to undress her, your movements rough but tender at the same time. She shivers with pleasure when your lips brush against her exposed skin; it feels so good to finally be together like this after all these years. With a sigh of contentment, she closes her eyes and lets herself sink into the sensation of your touch as you guide her deeper into this intense and passionate encounter.

Her body trembles as you position yourself between her legs, the head of your erection pressing against her entrance. With a soft moan, she arches her back, offering herself up to you completely. As you push inside, filling her up inch by delicious inch, her mouth falls open in a silent scream of pleasure. Her hips buck against yours, meeting each thrust with an equal measure of need and desire.

Her fingernails scrape roughly down your back, leaving little trails of pleasure-pain mixed together as she struggles to find purchase on the sheets beneath her. With a sharp gasp, her body tenses and releases, wrapping itself around you as waves of ecstasy wash over her in an intense orgasm that seems to last forever.

Her breath coming in ragged gasps as she feels you begin to move within her once more. The sensation of your flesh sliding against hers is almost too much to bear; it's been so long since they've been intimate like this and it feels so good to finally have you inside her again. She moans loudly, arching her back off the mattress as she meets each thrust with a force of her own, their bodies moving together in perfect harmony.

Her hands clench into fists against the sheets beneath her, digging her nails deep into the fabric as she tries to focus on anything other than how incredible this feels. But it's no use; every time you brush against that spot inside her, she is lost once more in a maelstrom of pleasure that leaves her breathless and shaking with desire.

As their lovemaking reaches its climax, she feels herself again on the edge of orgasm, her body tensing as wave after wave of ecstasy wash over her, leaving her drained and satisfied but craving more already. She whispers your name hoarsely, her voice raw with emotion as she clings to you tightly, unable to believe how good this feels or how lucky she is to have you here with her now.