I SEE MY STEPSISTER PLAYING WITH HER PLASTIC PENIS AND I PUT MY REAL PENIS ON IT.

The description should be a minimum of 400 words.

In the description, we have a steamy sister-fantasy encounter that unfolds in the dimly lit living room of a college dorm. The scene begins with a curious little sister, who's just turned 18, playing with a plastic penis, her eyes sparkling with innocent curiosity. Her brother, a strapping, muscular college jock, walks in, catches her playing, and can't help but be intrigued by her innocent display. She doesn't even notice his presence as she continues to explore, her fingers gently caressing the toy, her cheeks flushed with excitement. He can't help but approach her, his own cock stirring at the sight of her. He takes the toy from her and shows her what a real man's cock looks like. She's wide-eyed, her mouth falling open in a mix of shock and awe. He gently guides her hand to his cock, showing her how to handle it, how to stroke it. She's hesitant at first, but her curiosity gets the better of her as she starts to stroke him, her soft hands wrapping around his thick shaft. He groans in pleasure, his hips thrusting forward, meeting her touch. She looks up at him, her eyes filled with a mix of fear and desire. He leans down, capturing her lips in a searing kiss, his tongue exploring her mouth. She melts into him, her body pressing against his, her hands still stroking his cock. He breaks away, his breath ragged, and whispers in her ear, "I want you to suck my cock, little sister." She nods, her cheeks flushed, her eyes filled with determination. She gets on her knees, her eyes never leaving his as she takes his cock in her mouth. He groans again, his hands tangling in her hair as she starts to suck. He can feel her inexperience, but her enthusiasm is undeniable. She looks up at him, her eyes watering, her lips stretched around his cock. He can feel himself getting closer. He groans, his hips moving, fucking her mouth. She takes it all, her head bobbing, her eyes never leaving his. He comes with a groan, his cock pulsing in her mouth. She swallows, her eyes filled with satisfaction. He pulls her up, his arms wrapping around her, his lips capturing hers in a passionate kiss. They fall back on the couch, their bodies entwined, their breaths ragged. She looks up at him, her eyes filled with a newfound confidence. He smiles down at her, his fingers tracing her jawline. "You did so well, little sister," he says, his voice filled with pride. She smiles back at him, her cheeks flushed, her eyes filled with desire. They continue to explore each other, their bodies entwined, their breaths ragged. The scene ends with a passionate kiss, their bodies entwined, their breaths ragged.