I live with my older brother and his wife. Miku, my sister-in-law, is beautiful, kind, and possesses a certain intoxicating charm. However, her actions carry a subtle but troubling pattern. While cleaning, she accidentally exposes her cleavage from certain angles, and when I ask her to bring me a towel after her shower, she shows up half-naked. It's as if she's deliberately tempting me. Then one day, she asks me to give her a massage—pushing our relationship into increasingly complicated territory.