I work in a small key man office condo. It's quiet and there are about half or so of the spaces vacant, which means it's quite peaceful most of the time now. The other two tenants keep less routine hours than I do, one being a guy that is out a great deal and the other a young lady only a couple of years out of college who does interior design work. She spends almost as much time there as I do, but tends to come in much later in the day than I do.
Yesterday I was in my office space and had closed my office door out of habit and was working along quietly doing mainly email responses and writing letters when I heard the young girl come in. She's quiet but I can tell which door is opening, and she walks much softer than the guy does when he comes in. Oh, and I was driving a different vehicle now so she likely didn't recognize me being there. There is another office condo right next door that shares the parking lot so who comes and goes can't always be known by what cars are in the lot.
Now let me tell you about this young girl, whom I'll call Ann. Ann is tall and slim, but with large breasts for her build and an ass that is shaped just right and firm. Nothing moves when she walks. Her skin is naturally dark and she has long dark hair with large brown eyes, sort of looking like she has some American Indian or Caribbean heritage in her. All in all she is a really sexy looking girl that isn't too much younger than me.
So, I'm working along yesterday and I hear Ann come in. I worked about an hour or more and heard her walking around in the common room, use the copier, use the bathroom, make some coffee, etc, and I knew from the way she was humming to herself she thought she was the only person there. At times when there is only one of us here it isn't uncommon for us to lock the front entrance door because there's a dentist office next door and the old folks often forget which door to use and wind up wandering around in our office. So, I felt that Ann had likely locked the door behind her, as I had done, and she felt comfortable that she was the only person there.