During the summer Obon holiday, the day my brother and his wife came home to visit, I met my sister-in-law Ema for the first time. She's young, beautiful, and has a stunning figure—huge breasts that always peek out through her skimpy clothes, her nipples clearly visible. Unable to resist her erotic allure, I secretly slept with her again and again behind my brother's and parents' backs. A single summer's secret, our sweaty bodies entwined.