Due to my father's remarriage, a new younger sister suddenly arrived at our home. She appeared delicate, kind, and somewhat reserved in demeanor. But one night, while tending to me as I was drunk, she began revealing an unexpected side. She seduced me with a gentle, warm voice, and I could no longer resist—my instincts ran wild. The moment she took my penis into her mouth, her true nature was unveiled. In fact, she was hairy, deeply interested in sex, and harbored an aggressively passionate personality. Her true self drives the story into even deeper territory.