On the day I returned to my parents' home, I found my sister-in-law cleaning the house wearing a short skirt. Her panties were clearly visible through her pantyhose, and I couldn't resist the urge, secretly jerking off. To my shock, my sister-in-law caught me in the act. I feared she'd be disgusted or angry, but instead, she became intensely curious about my cock and started touching me aggressively. It turned out she was frustrated from a sexless marriage with my older brother and had developed a strong interest in me. Our mutual desires quickly aligned, and we began secretly touching each other and giving each other blowjobs whenever the family wasn't around—until we finally crossed the line. When the house was empty, we passionately fucked in intense, deep thrusts in places that heightened her humiliation, like the hallway and kitchen.