Under the same roof, the relationship between the younger brother-in-law and his sister-in-law carried an unnaturally tense atmosphere. The sister-in-law's seductive demeanor exuded a clearly abnormal vibe. One day, the younger brother accidentally witnessed his older brother and sister-in-law having sex in a private room, leaving him deeply shocked. In that instant, a firm suspicion took root in his mind—he realized the sister-in-law was not merely a woman, but someone harboring a touch of madness. At that moment, he became certain she was not just a lustful woman, but someone concealing a dark secret. And the words, "Do you really crave my cock that much...," symbolized the darkness growing within his heart.