I'm a gay guy having an affair w/ a married bi guy?

and yesterday I went to meet him for lunch. I was waiting for him to finish up his work in his office, when his wife knocked on the door, coming to "surprise him. He made me get under his desk and let his wife in. As he was sitting at the desk talikng to her, he slowly unzipped his zipper. Then he grabbed my head and put it between his muscular biker's thighs and forced me to start giving him while he talked to his wife. She left after about ten minutes. I was surprised, it was pretty hot. But I felt bad about it, like i was doing something wrong. What should I do?