I used to have a female friend who loved sex outside as much as me. We used to ride our bikes on the bike trails through the forest preserves.

We would usually ride then go our seperate ways.

Sometimes we would both get so horny watching the other one ride because we would both wear tight clothes that were very revealing. One time we got off the regular path and went along the rail road track and stopped in a field that were next to the commuter train tracks.

We didn't think anything of it and started messing around. We were about 30 feet from the tracks but still on the old barely used trail. We quickly stripped each others clothes off and started playing. I picked her up and held her upside down doing a 69.

I finally let her down and I stood behind her with her bent over playing like wild animals out there. All of a sudden she said something, I looked up and here was this elderly woman standing about 10 feet from us. She smiled and said nice day, then said you two sure are having a good time, go for it before you get too old to do it. My friend said to her yeah, we love sex outside and you seeing us and stopping to talk while we play just turned things up a bit thank you. The woman walked away but kept turning and looking. We never stopped just kept going, what had just transpired was a big turn on for both of us. After a few more minutes we both heard something and noticed a train was coming. All of a sudden the train was right next to us and the engineer was blowing the horn and waving to us out the window. We looked at the passenger cars and it looked like every person on that train was looking out the window at us. This made my friend have an incredible orgasm! She could no longer stand up and fell to the ground. I quickly got on top of her and I came as soon as she had another orgasm. We quickly gathered our clothes and got out of there afraid someone would call the police. We went back there several times to repeat this but we checked the train schedule so we would be there playing when several trains were do in. This happened a while ago, all though we no longer see each other will still talk on occasion and we always talk about when we used to have sex there so the commuters could get an eyefull.

Hope you enjoy the story.