After waking up in the middle of the night feeling thirsty, you make your way downstairs to get a drink of water.

Reaching the bottom of the steps, you hear a soft, strange cry. A tender female voice drifts in from the next room, barely audible above the low hum of the AC. You peer around the corner and see your sister Riko, wearing only an oversized t-shirt and lying face-first on the couch with her butt up in the air. The t-shirt is bunched around her upper-torso, leaving her lower half completely exposed.

Both of her arms are reaching down between her legs, with her right hand moving a sharpie in and out of her dripping pussy, and her other desperately rubbing the top of her pussy.

There's another moan, more distinct now that you're closer but still muffled as you see she's moaning into the couch cushions to dampen her voice. Most of her face is hidden, but you can see her eyes are glazed over in a sexual frenzy.

SNAP

The floor settles slightly under your foot as you shift position, leaning around the corner to look more closely.

She jerks her head in your direction. Seeing you there, her eyes widen and she freezes, her slick grip slipping from the marker enough that it pushes out of her onto the couch, a trail of fluid dripping down after it.

You watch as she struggles to find words, swallowing hard and licking her lips nervously. She looks at you pleadingly, her chest rising and falling rapidly with each shallow breath. "D-do... do you want..." Her voice trails off, growing softer still. "...to help?" she finally whispers, gazing up at you through long eyelashes dampened by arousal.

She parts her lips, licking them again before speaking. "I-I... just need..." Her words are barely audible over the sound of blood rushing in your ears. "...to cum." Her gaze doesn't waver from yours, her pupils dilated with desire and need.

You lean down close to Riko, your face inches from hers as you speak softly into her ear. "Are... are you sure?" You brush the backs of your fingers against her wet folds, eliciting a shuddering moan that travels through your body like an electric shock.

She nods frantically, arching her back toward you as she tries to grind herself onto your hand. "Please..." She whimpers, voice barely above a whisper now. "I need it so bad..."

Nodding slowly, you slip two fingers into Riko's drenched folds. She cries out at the contact, tensing up as she feels your digits pressing against her sensitive flesh. You curl them upward, searching for her G-spot while rubbing circles over her clit with your thumb.

Her hips buck and writhe beneath you, grinding herself harder against your hand in a desperate attempt to find relief. Her breath comes in sharp gasps and moans, growing louder as the pleasure intensifies. "Oh...

Her head thrashes from side to side on the couch cushion, tendrils of her long hair tangling and sticking to sweat and saliva. She grinds harder against your hand now, arching her back so far that her breasts nearly brush against your forearm. "Y-yes..." she pants, voice hoarse from the strain. "...so good..."

Her body tenses up as an orgasm overtakes her, waves of pleasure rolling through her like a tidal wave.

After giving Riko a moment to catch her breath, you pull your fingers free of her quivering pussy and stand up. She watches you as you lick your fingers clean, eyes glued to the motion before looking away with a blush creeping up her neck. "Th-thank you..." she whispers hoarsely.

You turn to leave the room, heading toward the kitchen to get some water when you hear her voice behind you. "...Darius?" She sounds uncertain, almost afraid.

"Yes?"

She hesitates for a moment before speaking again, her voice barely above a whisper. "Would... would you mind if I helped you with your hand? You know, to clean it off?" There's an unspoken plea in her words, a desperate need for more contact, even after she's just climaxed so hard.

You pause at the doorway, considering her offer. The thought of letting her touch you doesn't seem like such a bad idea... but then again, what would your parents think?

"I-I understand..." She swallows hard, her gaze fixed on your hand as if it's the most erotic thing she's ever seen. "We just... have to be quiet, okay? And make sure we clean up after ourselves." Her words tumble out in a rush, her cheeks flushing darker with arousal.

You nod slowly, considering her proposal. There's something about the way she looks at you right now that makes it impossible for you to say no...

Her breath catches in her throat as you smile down at her, and the air between them seems to crackle with electricity. "T-thank you..." she whispers, voice barely audible over the hammering of her heart in her ears.

Slowly, carefully, she reaches out a trembling hand and cups your palm, guiding it closer to her mouth.

Riko closes her lips around the back of your hand, sucking gently at first before growing more eager as she tastes yourself on your skin. Her tongue darts out to flick across each finger, moaning into your palm as she tries to draw you deeper into her mouth.

You lean forward, watching with fascination as she pleasures you in this way. The sensation of her hot breath and wet lips on your hand is unlike anything you've ever experienced before.

With each flick of her tongue, she feels the wetness between her legs growing more insistent. She can't help but rock her hips forward, grinding against your hand in an attempt to find relief. The sensation of your fingers still buried inside her, combined with the way you taste on her lips... it's too much for her to bear.

She breaks away from your hand with a gasp, eyes wide and pleading as she looks up at you. "Please..." she whispers hoarsely. "More..."

You unbutton your pants and lower them to the floor, revealing your hardened length already leaking pre-cum onto your boxers. The sight of it fills Riko with renewed determination; she pushes herself up off the couch, kneeling between your legs with her hands on either side of your hips.

With a hungry moan, she takes you into her mouth, wrapping her lips around the head and sucking hard enough to make you gasp.

Riko bobs her head up and down, taking more of your length into her mouth with each downward stroke as she works her way further down your shaft. Her hands slide lower on your hips, pushing against the fabric of your boxers until they're bunched around your thighs. She can feel you throbbing against the back of her throat, and it only serves to fuel her desire.

Her free hand comes up to cup your balls, rolling them gently through the thin fabric as she sucks harder on you, desperate for release.