I commute on the subway daily and was riding home from work after a late evening in the office during a heat wave a few weeks ago. Some of the seats in the subway cars face one another on either side of the doors.
The car I was riding in was nearly empty and there was a young woman sitting in a backwards facing seat across from me. The air conditioning in the car couldn't keep up with the heat and we were both perspiring and stretched out to remain cool. My job requires me to wear pantyhose even on the hottest of days and I couldn't wait to get home and change.
For the longest time I didn't notice what was happening ahead of me because I was reading the newspaper but looking up at one point I noticed that the girl's legs were slightly spread and it seemed she wasn't wearing underwear. Without being obvious I tried to glance over the top of my paper to be sure and with the jostling of the train and the heat, her legs spread a bit wider than she probably intended. She was reading too and didn't seem to be aware of my glances.
I had to adjust my position to view between her legs properly, the light wasn't very good. I'd never been attracted to a woman before, I change and shower in a public locker room three times a week, but something about the heat and the voyeuristic nature of watching her made me begin to tingle.
I positioned my bag so that I could hold one hand over my skirt and press down lightly. I knew when I got home to my apartment I'd have to give myself an orgasm.
As we neared a stop the girl began folding her paper and repositioned her legs so that I could no longer view between them. Then she reached down to pick up her briefcase and as she bent she let her knees open wide and I could clearly see her lips outlined by her pubic hair.
I tried to make eye contact with her as she rose to leave, but she didn't look my way.
When I reached my stop and walked to the enclosed parking lot I was so hot (from the weather and the girl) that I slid my pantyhose off in the car, started the air conditioner, and rubbed my clit until I came. I've seen her once since but she was sitting in a seat that was blocked by another. If I ever talk with her I'll write again.