I came to stay at my uncle's house in Tokyo while preparing for my college entrance exams. His wife, Ai, a prestigious university graduate, was supposed to help me with my studies. However, one day I accidentally saw her masturbating while wearing elegant, high-end lingerie, exuding a refined sensuality. As a naive virgin from the countryside, I was completely shaken by the sight, and studying became the last thing on my mind. Then, Ai moved closer to me and softly whispered, "You saw me yesterday, didn't you?" as she gently pressed her lips against mine, rapidly changing our relationship forever.