In the quiet of their home, a curious brother can't help but notice his little sister's growing womanhood. Their innocent interactions begin to shift, charged with an electricity they can't quite understand. As she blossoms, her brother struggles with his newfound desires, torn between familial love and carnal lust. Their games become more daring, their touches more lingering, until one day, they cross the unspoken line, giving in to their taboo cravings.