Watched by Security

My wife and I lived in Las Vegas at the time and we were staying in a short term rental between apartments. There was 24 hour Security who monitored the property and would make rounds. Our unit was 3rd floor end and the balcony past our bedroom window gave a good overlook of the parking area. I later learned Security would often stand there and watch the parking lot from the vantage offered. One night we're getting into it, role playing and using toys. I really enjoy watching her and keep the lights on at every opportunity. Being on the top floor end no one ever has need to walk past our bedroom window (or so I thought) so our window was often open. The bed was positioned right below it to let the cool night air blow in. My wife is laying back, legs spread while I work a larg black dildo into her pussy. I'm watching her expressions of pleasure and listening to her moans as I described watching her get stretched by the dildo. It was was then I noticed him, the Security Guard was standing down the way trying to keep in the shadow looking our way. Not even realizing I was doing it, I turned her around, head to the foot of the bed; on her back spread legs to the window. I glanced towards the window and the Security Guard had moved closer. I then spread my wife's pussy and slowly began to fuck her with the dildo. When I looked back to the window he had moved right up; only a screen and about 3 feet now sperated this stranger and us as I worked the large black cock into her. I began to talk dirty to her, asking if she wished that were a real black cock fucking her in front of me. Making her describe how she wants him to fuck her like she needs. She had no idea we were being watched by the very thing she (and I) wanted. I couldn't hold out any longer. I layed down and pulled her atop me; ass still facing the window. I reached down and grabbed her ass, spreading it wide. I exposed and played with her dripping pussy, telling her how I was getting her ready for a BBC. Just as I entered her I pulled her head close and whispered "we're being watched" then plunged in as hard and deep as I could. She gasped and tried to turn to look but my arms held her in place as I reached down continuing to spread her ass, giving our guest a good view. "No, pretend you don't know and tell me loudly how you're getting fucked by a bbc right now" I quietly said to her. With that she fucked me like never before and said some of the dirtiest and hottest things ever to come from her mouth. I didn't last long and soon was cuming deep inside her. I continued to fuck her slow and deep. She then kissed me passionately and loudly said "maybe our new friend at the window will come and finish what you couldn't!" My heart stopped beating, we both turned to look to the window; our guest had left. She looked back at me "too bad for him" and began to grind against me, my hard on remerging. She then used my cock as her plaything until she was exhausted. Our friend never returned for an encore but we made sure the window was open, blinds pulled up, and lights left on whenever we were feeling extra naughty.