In the confines of their shared home, a curious sister can't help but notice her brother's growing manhood. She begins to masturbate in secret, her fingers dancing over her clit as she imagines his thick cock inside her. One day, he catches her, his own arousal evident. They argue, but the tension between them is undeniable. Later, they find themselves alone again, her eyes locked on his cock as he strokes it. They're interrupted, leaving them both breathless and yearning for more.