Karen and Yuki were assigned to a business trip in Osaka. Due to a sudden storm, all public transportation stopped operating, leaving them with no choice but to stay overnight. Unfortunately, there was only one room left in the hotel, so they had to share it. When they arrived at the hotel, both Karen and Yuki were completely soaked. Their wet clothes revealed their underwear and skin, exposing a part of Karen's ample bosom to Yuki! Yuki, a young man who had never been intimate like this before, couldn't take his eyes off this beautiful bosom! Karen noticed but knowing that Yuki was inexperienced, she teased him by exposing a part of her bosom for Yuki to see. Unable to resist, Yuki unexpectedly made a move on Karen. At first, Karen resisted, but seeing that Yuki was inexperienced in sexual matters, she reluctantly agreed. She allowed him to kiss, fondle her breasts, and then perform oral sex on him. But that wasn't enough for Yuki. He wanted more; he wanted to feel like a man! However, as it was his first time, Yuki quickly ejaculated. Nevertheless, his penis remained erect, and he asked Karen to let him have sex with her again. Karen agreed and began to teach Yuki how to wear a condom, different sexual positions, and how to pleasure a woman... Yuki's skills improved significantly, and he even made her feel more pleasure than her previous partners. Karen developed feelings for Yuki, and they engaged in passionate lovemaking all night long. By the time the morning came and the sky cleared, the train services resumed...