This happened on a week night while my ex was working late. Her office was in a city high rise — a large open plan space with chest high cubicle walls for each workstation. Her line of work was such that it was not uncommon for staff, security and cleaners to pass through the office at random times during the night.
After finishing off her work, to show her appreciation for me waiting on her she unzipped my shorts, slipped out my cock and began to suck me off while still seated in her chair. Both being daring deviants, we undressed completely and moved to her bosses office a few feet away. She hopped onto the desk and I began to fuck her with slow deep passionate thrusts. The fact that she absolutely despised her boss made it all the more special. I imagined the very next day he’d be working where her ass, my balls and our juices were making a mess. I turned her over, pushed her face down into the table and continued to fuck her from behind. I could hear her head tap the computer monitor with each thrust. Cum dripped all over the edge of the desk and onto carpeted floor where her boss usually sits. I stopped thrusting for a moment when we saw a security guard doing his rounds outside the reception area. I did not pull out. When the coast was clear I picked up the pace. When I was ready to cum, she hopped off the table, sat in chair, leaned over and took my cock in her mouth. She swallowed and cleaned me off. No mess. We quickly cleaned the area as best we could, left the office, fetched our clothes from her cubicle and dashed over to the staff kitchen.