While drinking at our mutual boss's house with my girlfriend, she got drunk and started unbuttoning her blouse, revealing her big tits. She suddenly spread her legs wide open, exposing her panties, and our middle-aged single boss became completely absorbed in sexually harassing her. I could barely hold back, feeling like I was losing my mind. Just then, we ran out of alcohol and the boss ordered me to go buy more. Frustrated because there was no nearby convenience store in the residential area, I tried calling the boss—but at that moment, I heard my girlfriend making strange noises, throwing me into even greater confusion.