I'd had to work late. Again. My boss insisted that the report due out the following Monday had to be on his desk before I went home for the day. My wife seemed very understanding when I'd called and told her not to wait up for me. When I quietly opened our door, so as to not wake her, this was the first thing I noticed.
Then I heard the noise. I didn't want to believe it at first, though there was no mistaking my wife's grunting in sexual pleasure. Tiptoeing to our bedroom door, I slowly cracked the door and that is when I understood why my boss insisted that I work late.
And why my wife was not upset that I had to.