What's the name of a porn movie with noir sex scene?

(The picture is not related) Some time ago I've seen a porn movie on xvideos, that featured a scene inspired by a noir crime movie. It was monochromatic and featured a classic detective having sex with his sexy female client and his female assistant (I think) in his office. I've seen it once and I can't find it now, I don't remember any of the actors. Does anyone know what movie can it be?