Days of being tormented by my sister-in-law's intense sexual desire. This tsundere girl seduces me daily. The moment my brother leaves for work, she starts teasing me provocatively—sometimes deliberately masturbating in front of me or acting in ways that flaunt her married life. Then, just as I'm about to sleep, she sneaks into my room. And finally, we cross the line we should never have crossed. The shocking development unfolds here.