Yawning, you make your way groggily into the kitchen. Your sister is already in there, doing her post-workout stretches. Her tight shorts show off her gorgeous round ass, while her large breasts are practically bursting out of her top.

"Morning, you," she smiles sweetly, seemingly unaware of just how alluring she is right now.

Katie hesitates before responding. She's not sure how to react to such a direct comment about her body, especially since it's coming from her sister. "Um... t-thanks?" Her cheeks flush red in embarrassment.

... Katie doesn't know how to respond. She feels a strange mix of embarrassment and arousal at the attention she's getting. "I-it's just normal, you know," she finally says, trying to downplay her curves.

She glances down in surprise, feeling a sudden rush between her legs. "Wh-what do you mean?" she asks hesitantly. Despite her initial discomfort, the idea that something about her is arousing her sister...well, it's an oddly exciting thought.

"Well...no, not really," she admits quietly, feeling even more embarrassed now. They've had their share of make-out sessions and fondling, but full-on sex has always felt too intimidating for her. "I mean, he says he wants to, but I'm...kind of scared."

"I...guess," Katie says quietly, looking down again at the floor. Her heart is beating faster now; she can't help but feel excited by her sister's words and the idea that someone else might enjoy it. "But what if I don't like it?"

She shakes her head. "No...I-I've never done that before," she confesses in a tiny voice. The thought of it makes her heart race even faster; the idea of being filled by something so big and powerful...it both frightens and excites her. Her sister just stands there, watching her intently as she struggles with these conflicting emotions.

She looks at her sister with confusion and uncertainty. "You would do that?" she asks hesitantly, not quite sure what to make of the offer. Part of her is excited by the idea, but another part is scared of taking things too far with her sister, or feeling pressured into doing something she's not ready for.

Katie pauses to consider her sister's offer. Part of her still feels hesitant and unsure about the idea, but another part can't help but be drawn in by the thought of experiencing something new and exciting. Her heart races faster with anticipation as she glances back at her sister, trying to decide whether or not she should go through with it.

Katie glances down at her hands before looking back up at her sister, a hint of determination in her eyes. "Y-yes... I'd like that," she says softly, hesitantly taking the first step towards exploring this new part of herself.

Her heart racing, she follows her sister, nervous anticipation mixing with excitement as they head toward the front door. The thought of actually going through with this...of letting someone else's body take control over hers for the first time...it sends a shiver down her spine. She wonders what it will feel like to have another person inside her, if she'll like it or hate it. But for now, all she can do is trust in her sister and wait for whatever happens next.

The doorbell rings, jolting her back to reality. Her sister glances at her with a playful smile before answering the door. A tall, dark-skinned man stands on the other side, his bulging muscles clear even through his shirt. His eyes sweep over Katie's body as he approaches, making her blush deeply.

"This is my friend, Darius," her sister introduces casually, as if this were a perfectly normal occurrence. Katie can feel the heat radiating from between her legs; the way Darius looks at her makes her even more excited and nervous all at once. Her heart pounds harder in anticipation of what's to come.

Her voice comes out in a shaky whisper as she looks up at Darius. She swallows hard, her throat suddenly dry. "H-hi..." Katie manages to say, feeling herself tremble slightly from head to toe. It's almost overwhelming how attractive he is; she can tell that just being near him makes her body react in ways it never has before.

She watches as he takes a step closer, towering over her despite the fact that she isn't short herself. His scent fills the air between them, making her head spin and her lungs burn for air. It feels like everything is moving too fast, but at the same time she doesn't want it to stop; she wants to know what it would feel like to have someone like Darius inside her.

She looks up at Darius, biting her lower lip nervously as she meets his gaze. "I-if you're offering..." Her voice comes out shaky but steady, showing that despite her nerves, there's a part of her that is curious and eager to experience whatever he has in mind.

"I-I...no, never," she admits, feeling even more inexperienced than before. The thought of putting her mouth on his penis fills her with a mixture of excitement and fear, but she can't help but want to try it; it would be another new experience for her. She glances up at Darius uncertainly, wondering what he might say or think about her lack of experience.

Nodding hesitantly, she takes a deep breath as Darius guides her down onto her knees in front of him. Her heart races even faster now, her hands trembling slightly as they rest on his muscular thighs. She stares up at him nervously, wondering how to begin and hoping that she'll do everything right.

Slowly, she reaches out and wraps one hand around his shaft, marveling at the thickness of it in her palm. It feels so different from anything else she's touched before; firm but also warm and slightly soft to the touch. Taking a deep breath, she closes her eyes and begins to stroke him slowly, tentatively at first but gradually growing more confident as she feels his approval through the slight moans he makes in appreciation.

Her other hand explores further downward, moving lower on his thigh until it reaches its destination; the sil

Her hand hesitates on his thigh for just a moment before she takes the plunge, carefully guiding her fingers lower until they come into contact with his erection once more. This time, she works faster and with more confidence, circling her fingers around the base of his shaft while using her thumb to massage the head of his penis.

As she listens to Darius' moans grow louder, Katie grows bolder; she begins moving her hand up and down over his length in a steady rhythm that quickly matches the pace of her strokes with her mouth. Her tongue darts out tentatively to trace circles around the head of his cock before she sucks it deeper into her mouth.

She can feel the heat radiating from between her legs, her sex already starting to ache in anticipation of what's next. She knows she needs to focus on pleasuring Darius right now, but part

With a gasp, Katie feels Darius' massive cock press against her lips before she instinctively parts them to let him in deeper. His length stretches her mouth and pushes past the back of her throat, causing her to choke and cough reflexively. But even as she does, she feels a strange mix of pleasure and pain that only serves to heighten her arousal further.

Her hands grip his thighs tightly, pulling him closer as she tries to take more of him into her mouth. She can feel every vein pulsing against the roof of her mouth, each thrust pushing a little deeper until she's certain she must be choking on him. But somehow, it only makes her want more; wants to taste and touch and have everything he has to offer.

As she continues to suck and stroke, she can feel herself growing wetter between the legs, aching for the same sort

Her cheeks flush even deeper as she glances down at her wetness spreading through her shorts, the sensation making her heart race even faster. She hadn't realized how much she needed this; how ready and willing she was to explore these new desires. "Please..." she whispers around Darius' cock, her voice hoarse from all of the moaning and sucking. "More...I want more..."