My boss is Matsu-san, who is like an older sister to me. She always smiles and treats me kindly. She was someone I admired. Today, I had a lot of work to do, so I ended up working overtime with Matsu-san. I was glad that I had finished work, but the last train had already passed. Then Matsu-san told me that I had no choice but to buy some alcohol, so I went to the convenience store. As we drank, the conversation turned to my girlfriend. In fact, I had broken up with my girlfriend a while ago, and Matsu-san asked me why we broke up. I was embarrassed about the reason, so I evaded the question, but she pushed me and said that it was because of my sexual desire. I had asked her many times, and she had lost interest in me. While we were talking, Matsu-san got drunk and fell asleep. I got up from my seat to get some water, and when I came back, Matsu-san was sleeping with her skirt open. I kissed her on impulse. Excited by her nice smell, I caressed her over her clothes. But then I came to my senses and put my jacket over her. The next day, I couldn't look Matsu-san in the face. A few days later, I ended up working overtime with Matsu again...