I ran into my ex Marco recently. I wasn't seeing anyone at the time and was feeling horny, (and I knew he had nine inches of cock to play with), so I invited him over. I made it very clear that we were not getting back together, and this was just going to be some no-strings sex.
My backyard has a hill at the back that goes up about 10 or 12 feet. There are no fences at the back or the sides as my house sits further back than the two on either side. The neighbors can't see into my yard unless they walk to the back of their yards. On the hill are some trees and a Korean church, and the parking lot for it, accessed from the next street over.
It was late afternoon on a nice sunny day, so we went out back. I started kissing Marco and taking my clothes off at the same time. He was quite surprised to see me get naked outdoors. We never did anything outside back when we were together. He had no idea how much I had experienced since then. As we continued to kiss, I undid his pants and let them drop to his ankles. Then I dropped to my knees and took his cock in my mouth. After a minute or two I told him to lay down, and I mounted him.
Marco was lying in the grass with his feet pointed toward the house. I was on top, riding his cock cowgirl style, facing the hill. We had been going at it for a few minutes when I happened to look up and see someone standing on the top of the hill between the trees, watching us. It looked like one of the monks from the church. He was only about twenty feet away from us, and it excited me. I started bouncing faster and harder on the cock below me. I stared back at the monk the entire time and smiled, even pinching my nipples for him.