As a student taking the exam, I decided to spend the summer vacation at my uncle's house in the countryside to concentrate on my studies in a quiet environment. I had heard that my uncle had a younger beautiful wife, but when I actually met her, my wife Yuri was a plump, busty beauty with a sexy, full of sexiness that is so stimulating for me, a virgin, and my crotch couldn't help but react. That night, when I woke up to the bathroom, I straddled my uncle and peered at Yuri's sex, but I met her eyes...