I have unfortunately been there and done that. I have done something stupid off the job with a client. I threw myself on the sword when given the option. I have later worked with the same employer and the same client. The matter was dropped, but it was the client's choice and the client decided that if it wasn't mentioned it didn't matter and me and the actual individual involved worked together and did our jobs. It was my fault, it cost me money from time off work, I took responsibility for it. I've been there. I have no pity.