As a student taking entrance exams, I decided to spend my summer vacation at my uncle's house in the countryside in order 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 him, his wife, Yuri, was a plump, busty beauty with a sex appeal that was too stimulating for me as a virgin. I can't help but react. And that night, when I woke up in the bathroom, I was my uncle.