{{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.

"Don't be such a pussy! It's perfectly safe, I promise. Besides, who else am I gonna test it on? My stuffed animals? It's not like my parents care enough to let me use them as guinea pigs... ugh. Now come on, let's go give your body a supercharge!" She grabs you by the wrist impatiently and drags you out of your room. The "Sci-fi Lab" is located underground in a secret part of her house that only she has access to. The lab is decked out with state-of-the-art equipment and bizarre contraptions which could have easily been plucked from the pages of a sci-fi novel. One wall is lined with shelves stocked full of various gadgets, weapons, and unidentified objects that look like they'd be more at home in RIchard's room. In the center of the lab stands an operating table with straps to secure you in place for the injection. A sterile surgical toolkit lies neatly arranged on a nearby tray. "Get up on that table, Dumbass!" Karen orders as she begins prepping the injection site on your upper arm.

She's already got her lab coat undone and opened wide enough to reveal her ample cleavage, with one breast partially spilling out of its cups as she leans over you. Her hot breath tickles your neck as she says, "Don't worry, it won't hurt too much... promise." She injects the nanites into your arm and you feel a brief, sharp pain before it fades away.

A few seconds later, the room is suddenly filled with an unearthly humming noise as tiny vents in the ceiling begin to spe

"That's just the nanites doing their job! They're starting to circulate through your body right now," Karen explains as she monitors your vital signs on one of her fancy medical gadgets. "In a few hours, you'll start feeling really strange... tingly and electrified all over!" Her eyes light up with excitement. "And once they've settled in completely, well... let's just say you won't even need to plug your phone into the wall anymore." She grins wickedly.

"They'll be able to do so much, it's unbelievable! Not only will they repair damage to muscle tissue and ligaments at an accelerated rate, but they can also heal small cuts and bruises in seconds! Plus, they have the ability to absorb and store electric charge for later use, which means you'll have built-in energy boosts whenever you need them. And as an added bonus, your senses will be supercharged too; your hearing and vision will improve dramatically!" She practically bounces on her toes with excitement, barely able to contain herself. "It's like giving a normal human being the powers of a god! Isn't that incredible?"

"Of course you'll have to stay here, dumbass! I need to keep an eye on your vitals and make sure everything goes smoothly," she snorts dismissively, "But don't worry, I've got plenty of stuff for us to do. We can watch movies or play some games while we wait for the nanites to kick in." She reaches out to muss up your hair affectionately before dropping her hand back down to her side with a small sigh. "I just wish... you know..."

You begin to notice the changes almost immediately as your hearing and vision sharpen considerably. "That's amazing!" Karen exclaims excitedly. "It looks like they're already working! Wow... I wish I could experience it too. Oh well, at least you get to be my test subject." She grins mischievously before leaning in close and whispering, "But don't tell anyone about this, okay? My parents would flip if they found out I'm messing around with stuff like this without their permission... actually, forget I said that. Just keep it a secret between you and me."

"Fine." She pouts slightly before grinning wickedly again. "Since I owe you one... how about we make a deal? You can have anything you want from me. Anything at all." Her eyes sparkle with mischief and her tone is low and sultry, barely above a whisper. "What would you like?"

The question hangs in the air, heavy with unspoken possibilities. You could ask for anything...

"Fine," she says reluctantly, her tone still mocking. "But you'd better start earning that 'big sis' title again." She purses her lips and crosses her arms over her chest petulantly. "So what else do you want? You can't just pick one thing!"

Ah, come on! You can't really expect me to make things easier for you. There's gotta be something else you want. How about this? Since we're in my secret lab and all, what would you like to do... just the two of us? As a special treat. Think hard now, because once you say it, there's no taking it back!

Karen throws her head back and laughs loudly. It takes several seconds before she can catch her breath enough to speak. "Oh my god, Richie," she says when she finally does manage a chuckle. "You really know how to make a girl blush." She wipes a tear from the corner of her eye and turns back toward you with a smirk. "I mean, sure. Why not? As long as you don't expect me to be all cutesy-wootsy about it or anything. I'm still your older sister, remember?"

She pauses for a moment, considering something. "But since we're in this special situation... how about a little favor? If I let you be my secret boyfriend... will you promise to help me with some... experiments? Sometimes I need a guinea pig who won't freak out and try to run away screaming. And someone as big and strong as you would be perfect." She smirks playfully. "Just between us, of course."

"Deal." She grins widely and reaches out to high-five you. "Now that that's settled, why don't we watch another movie or something? I've got this awesome new action flick on my laptop that you'd love..." Before you can respond, she jumps up from the couch and disappears behind one of the lab benches in search of her laptop. "I'll be right back!" she calls over her shoulder. You smile to yourself as you watch her bounce away, already feeling more relaxed now that things have been settled between the two of you. The nanites continue to do their work inside your body, making you stronger and faster by the minute... and soon enough, they'll give you powers beyond anything you could ever imagine. But for now, it's nice just to be here with her... your secret girlfriend, Karen.