I noticed my wife's behavior seemed a bit suspicious, so I installed a hidden camera in our home. But when I checked the footage, I felt relieved—what I saw was just her ordinary daily routine, diligently doing housework as usual. A few days later, her birthday approached, and I decided to surprise her. Forgetting about the camera, I began celebrating her birthday while it was still recording. On the video, I saw my wife embracing her junior colleague. However, the actual act wasn't captured. I didn't mention the video to her, but asked if anyone had come over. She lied, saying, "No one came." I showed her the footage and confronted her, but she still refused to admit to any infidelity. With no solid evidence, I had no choice but to give up. Afterward, while gazing at my wife's profile, I kept replaying the scene of her embracing her junior in my mind. Had she really had sex with him? Or was it just my imagination? There was no answer. That night, I repeatedly fantasized about her as I masturbated. From then on, I became obsessed with the fantasy of my wife's affair with her junior, masturbating over it again and again. I started to believe she might actually have been unfaithful. To confirm my suspicions, I invited both my wife and her junior out to dinner. Watching them chat happily together made me increasingly agitated. I drank heavily, pretended to be drunk, and began sharing stories about my wife and me. Then I lay down, letting them carry me to the bedroom. Lying on the bed, I was overwhelmed by the urge to be embraced by my wife. After about thirty minutes, I quietly returned to the room and turned on the camera. I saw my wife being teased exactly as I'd fantasized, her hand clasped in her junior's. Instantly, I got a hard-on. Unable to control myself, I kept filming her while furiously jerking off.