I have seen a couple of questions in r/askredditafterdark about masturbating while driving and thought this might be a good time of telling you how I used to do just that.
I grew up in a suburb of one of the larger cities in the Midwest and went to college in a small town about 90 miles from my home. They were linked by a stretch of interstate that was not heavily traveled until the outskirts of the metropolitan area. Often, I was the only car in sight, even on a Friday afternoon driving home for a weekend visit. The landscape being what it is in that part of the country, needless to say it was quite a boring drive.
One time, probably around my second semeter there I was on my way back to the city and started to daydream about the naked makeout session I had had with my boyfriend a couple of days before. How he had been lying on top of me and rubbed his penis along my still virgin pussy lips and on my clit until I had orgasmed with my legs wrapped tightly around his thighs and how he had then shot his cum all over my tummy.