Heard my married coworker get railed

Just got back from an international event that we put on every year. There’s always a lot of drinking and fun after hours. I had a room next to one of my coworkers but she didn’t know, because I was down the hall when she went into her room. One night after we were all out, I started hearing noises from her room. They started to intensify and it was clear that somebody was fucking her. One of the hottest things I’ve experienced.