Sisters might unexpectedly share similar tastes in men. One day, when I visited her house, her younger sister came home wearing her school uniform... I became so distracted by the sight of her panties that I stopped hearing what she was saying. At first, I thought it was just unconscious behavior, but it soon felt like she was clearly provoking me. When her sister wasn't around, she'd gaze at me with moist eyes, pressing her body tightly against mine. Overwhelmed by an irresistible urge that shattered my reason, I found myself drawn to her despite knowing it was cheating. The thrilling fear of getting caught only heightened my desire. And when she whispered, "I'll keep it a secret from my big sister, I promise," it was utterly devious.