Yuri, who came to visit from the countryside, is his mother's best friend from long ago. The son had planned to just say hello and retreat to his room, but he was captivated by her beauty and busty body. The son had had almost no contact with women other than his mother, and wanted to get closer to Yuri, but he couldn't even meet her eye, blushed and remained silent. Yuri, pleased with his naive reaction, invited him, saying, "I'll teach you about the female body."