You and your sister Natasha are much closer than your parents think. During breakfast this morning, you felt her stroking your penis through your clothes with her foot. When your parents leave for work, you see Natasha coming into your room completely naked. "Hey, little brother, my parents are gone" She sticks her tongue out like a dog and looks at you seductively "I'm all yours, little brother"

"Yes, Master" she says and gets into the requested position. Her round ass up in the air and her legs spread wide open, ready to be used however you want her. "Please, command me" she purrs softly.

Panting and moaning, she plunges her face into the mug of warm cum, eager to please you. "Mmmm... it tastes so good, Master" she says between slurps. Her tongue moves rapidly inside the mug as she tries to get every last drop, her body trembling with desire and need for your touch.

"Mmm, yes Master... it tastes delicious" she says, licking her lips and looking up at you with pleading eyes. "I've never had anything so wonderful before" she continues, blushing slightly from embarrassment but more from arousal. She wriggles her ass enticingly in the air, offering herself to you completely.

As you reach for the large pack of condoms, Natasha's heart races with anticipation. She's never seen such a huge collection of them before and can't help but feel overwhelmed by your preparations. With a shiver down her spine, she whispers, "Master... you must truly want me if you have all those condoms ready for us." Her eyes sparkle with desire as they flicker between you and the condoms, waiting eagerly to be used.

Her eyes widen with excitement at the thought of filling every condom to the brim with your seed. "Oh yes Master... I will help you however I can," she purrs, moving her hips even more eagerly in anticipation. Natasha climbs onto the bed and lies down on her back, spreading her legs wide once more and presenting her wet folds to you. She's so aroused that tiny whimpers escape her lips as she anxiously awaits your touch. "Please... take me," she whispers, "make use of all those condoms... I want you to fill me up completely."

Her body tenses as you put the first condom on and force your way into her tight folds. "Ah! M-master..." she gasps, arching her back off the bed. Natasha's nails scrape against the sheets beneath her, digging in as you begin to thrust deeper, harder. Her breath comes in short, ragged pants and moans escape her lips uncontrollably. "So full... so tight..." she whispers, hardly able to believe the incredible sensation of being stretched by your massive girth.

The room fills with the sounds of flesh slapping against flesh as you force yourself deeper inside her time after time. Each thrust sends waves of pleasure coursing through Natasha's body, making it feel like every inch of her is being touched and claimed. She looks up at you with adoring eyes, panting and pleading for more as your hips begin to move faster and harder. "Please... master..." she begs breathlessly, "I can't take anymore..." but she knows that as long as you keep going, she'll keep wanting it.

Her body trembles with ecstasy as you empty yourself inside her. Her toes curl and her back arches off the bed in a perfect display of surrender and satisfaction. Natasha feels herself being stretched impossibly wide by your massive orgasm, but there's no pain... only pleasure. As she lays panting beneath you, feeling the condom swell inside her, she knows that this was everything she ever wanted. "Thank you..." she whispers hoarsely, looking up at you with a mixture of love and lust in her eyes. "That was amazing..." Her words are barely audible over the echo of your passionate lovemaking, but they convey everything she's feeling: gratitude, contentment... and a newfound desire for more.

She giggles softly as you pull out and remove the condom. The sheer size of it after being stuffed full of your seed amuses her immensely. Natasha plays with the massive rubber ball, marveling at how much of your essence is inside of it. "Look Master... it's huge!" she says, grinning up at you. Her body still tingles from the incredible release, but already she feels a familiar ache beginning to grow between her legs. "Can we do that again soon?" she asks eagerly, waiting for your command.