A couple moved into the apartment across from mine. The wife is stunning, and since seeing her, she’s been on my mind. I started peeking at her through the window like a habit. One day, while she was changing, I saw her perfect body. As I enjoyed the view, she caught me staring. Panicking, I thought she’d be furious or call the police, but she waved me over. Expecting anger, I apologized and offered to do anything. As if waiting for that, she made a dreamlike request: 'Practice sex with me.' Her husband, Konomi-san, isn’t into sex, no matter how she tries. So, she wanted to practice cowgirl with me to please him better. We kept fucking under the guise of 'practice,' more than she did with her husband. She even fucked me at my place while her husband stood across the window.