[NSFW] Unexpected witness to office hanky panky what do you do?

If you went to the back supply room which hardly gets used because most stuff is in the front supply room, to get something and when you open the door you see the new gal in the office that seem to rise through the ranks at meteoric speed (which was presumed because she was said to be “gifted”) bent over a pallet of toner cases with a senior manager behind her giving her hard and fast piston action with his pants around his ankles, what do you do? If you didn’t stare, say anything but closed the door in stunned amazement would you tell the secret to her quick upward climb? Keep your trap shut less the manager go gunning for you and get you fired? Blackmail her for the same favor? Hit him up for a promotion? What would you do?