I work 9am to 5pm doing security, my post is an office building. It's pretty busy during the day, but I mostly find myself just sitting on my ass on the monitor and greeting employees and making new badges for new employees. I have 2 patrols I do during the day of the entire building. Yesterday while on patrol, I walked pass the mail room and ass I get to the office of the female mail clerk, when I suddenly hear buzzing and moaning sounds from her office. I gently open the door and holy shit she was masturbating at her desk. Shit like this has never happened to me before. It was so hot watching her woth that diildo as she drilled that wet pussy. She was nice looking too, middle age blonde hair very nice tits. As she climaxed my radio goes off and she gets startled as she quickly pulls her panties and pants up. Luckily I made look like I was passing by so she didn't notice I was watching her. I casually wave at her like I saw nothing and she smiled and back and waved, she was bright red with embarrassment. I end my patrol as if nothing happened, but hopefully I encounter her again soon.