Back in the mid 90's my beautiful wife Diane (not real name) and I lived in a flat in a built up area but with no flats opposite. The flat was on the ground floor but elevated.
One afternoon, when I was at work, Diane decided to masturbate on the couch with her open legs facing the living room window. She knew no-one in a car could see in. She removed her pants, hitched up her skirt and started to finger herself.
After a minute or two she opened her eyes and saw that a lorry was parked right outside and the driver, who looked in his 20's, had a clear view of her masturbating and was leaning out of the cab to get an even better look. Rather than stopping, Diane continued masturbating whilst watching the lorry driver through half shut eyes.
She opened her legs further and furiously fingered her hairy pussy until she reached a huge orgasm, lifting her hips off the couch as she came.
After lying gently stroking her soaking pussy for a further minute or so she got up and left the room. She told me about all this a few days later.
I was delighted as I loved the idea of another man watching her and had often fantasised about it. This was just one of the times she did something like this. More to follow.