I was trying to finish the document for tomorrow when suddenly it started pouring rain. Without an umbrella and with all the trains having stopped, I had to stay at the office overnight. While I was working, Hikari-senpai rushed in. It turned out she had forgotten something and came back to get it, but since it was raining so heavily, she got drenched. So, both of us were stuck here together. Her thin shirt clung to her body, revealing her fair skin and her sexy black lingerie. As I was admiring, thunder suddenly crashed, and Hikari-senpai tightly hugged me! The scent from her body and the smoothness of her skin made my mind go blank. I couldn't help myself and took a deep breath of her scent, touching all the seductive curves of senpai's body. When I regained my composure, I realized that my actions were extremely wrong. Just as she was about to stop, Hikari-senpai changed again, she was no longer as resistant and shy as she was before, but she even took the initiative to solicit my love! And then we had sex all night, our bodies drenched in sweat and rain until the next morning...