It was a Saturday afternoon and I was visiting a friend in a flat. On my way down the staircase I could see into the flat below and I saw this lovely woman’s feet as she relaxed on the lounge. I got aroused at this and decided to take a peek . It was close to six pm and cold and they had the heater on and at this stage the curtains were open. The guy was sitting next to her and after some time I saw them fondling each other. I couldn’t see much of her as the guy lay next to her on the lounge set and since my view through the window was obscured I could only see him fondling her. As they were getting hot and were going to step things up they needed to close the lounge window and it got dark in the lounge. It was a small flat so I could still see from the kitchen window. The scene was better for me because the lounge was dark but the heater was on so the red light made the scene pleasurable. For a while I could only see hands moving and obviously they were fondling each other. He was lying next to her and I couldn’t see her from the window that I was peeping through. They obviously never knew they were being watched which made it so interesting to me because there was no acting involved. As I looked on the lady came into full view as the guy started to get on top of her to mount her. Her naked body glowing in the red light from the heater was such a beautiful sight. The guy was also naked and was on top of her but I couldn’t tell whether he was penetrating her since I only had the view of their heads and parts of the body. Unfortunately for me I couldn’t see her pussy which I am sure must have been beautiful because her body was stunning. I believe the guy was mounting her because I could see him moving up and down and her legs were raising higher and stayed there on its own. I don’t know what the guy wanted as he got up to go to the room and he must have seen me because he closed the curtain and I was disappointed as I was thoroughly enjoying watching him fuck his beautiful lady. I made my way to the lounge window and tried to get a peek and if there was a gap in the curtains I would be able to see her pussy and penetration would be in full view. Needless to mention the curtains were fully closed and I couldn’t see a thing. Sometimes now when I reflect on the incident I think it was a good thing he closed the curtain otherwise I wouldn’t have come around to the lounge side as I started to hear her moan as he was mounting her. I just love it when a woman moans during intercourses. She made such beautiful sounds even a well practiced orchestra would be put to shame. The guy on the other hand was silent and not even a word came from his mouth. After enjoying her moans for a few minutes I heard what I now realize as her climax the loudest and best grunting from her. Everything then went silent and they didn’t even speak to each other. I really enjoyed this as they seemed to make passionate love and there was no acting involved since they never knew they were being watched and listened to. Hope to get another experience like this and I simply loved the moments I had in this experience