Caught out

This was last week when the winter gave way to a few days of spring-like weather. It was around midday and I took the opportunity to go for a naked stroll around my back yard. At this time of day, and week, there is usually not much chance at getting seen by a neighbour. Sometimes the mere act of walking out in the open is quite arousing and this time was no different. Before long my cock was so hard and I felt I needed to very soon have to relieve the sexual pressure.
The sun felt warm against my skin and I could see the reflection of my naked self with hard cock in the glass, sliding doors. I must have stood there for a few minutes - occasionally stroking my erection and just enjoying the moment when I heard footsteps in the dead leaves of my back neighbours yard. I looked around and at this angle felt certain they could not see me, or at least may not realise I was nude. Then a female voice called, "hello". I didn't answer at first then she repeated, "hel-l-l-oo". Thinking she must know I was here and not wanting to seem an ignorant so-and-so, I called back. "Hi there", I replied.
Now, I won't go into the particulars of the conversation but will say that I do not think she knew I was naked. When she finished with the comments on the weather and so forth we said our good byes and I could hear her walking away.
There was something very erotic about talking to an almost stranger while I was nude. I was so incredibly turned on. As soon as I went back inside my house I had to lay on the couch and stroke my cock until I shot what seemed like cups-fulls of cum...I came that hard in fact that the initial blast shot up my chest and face.
How I wished she would knock at my door, or at least want to join me in a naked romp around the yard.
A day or so later I would discover that there is actually a particular angle that she could very well have seen me that day. This alone had me turned on again and a few times since has been fuel for some intense masturbation sessions.