My girlfriend and I were recently returning home from vacation the other day, and had about a 3 hour car ride. Some friends had tagged along with us, but had left a few hours before us, so on the car ride it was just me and my girl. Also because of the tag alongs, my girl and I didn't get any private time, and when we did the assholes kept interrupting us.
Well... long story short, to pay me back for her inviting the friends along, the last day she wore one of my favorite outfits, a halter top sundress - that she proceeded to tease me in all day. About 30 minutes into the drive home, she fell asleep. As I drove along, I noticed that trucks kept driving beside me, keeping pace, and at first I didn't pay attention but then I got curious thinking maybe something was wrong and began to check the mirrors and around the car.
Then I realized what was going on. While she was sleeping, her sundress had ridden up a little, and with her legs open, the front of her panties were in view, much to the delight of anyone that could see down into the car. A little excited by all this, I decided to let her sleep. I laid my hand on her thigh, and when I did, she spread her legs further, causing the dress to ride up further and her panties then were in full display to her hips. She was wearing a little grey and green thong, and as anyone that has any experience with those knows, the crotch on those things doesn't amount to much.
As the next truck passed us and slowed back down, I lightly touched her, and she closed her legs completely pinning my hand and finger between them, then reopened them wide again, this action causing the crotch to move a little, and putting a one half of her pussy on display. I rode this way with the trucker beside us for a few more minutes until we reached our exit, and turned off.
About 10 miles down the road from our exit, we came to a place where there was a lot of road work going on, and the road was turned into a one lane, with a flagman. Needless to say when our turn came the flagman stopped us, and held us up for several minutes, and though he was wearing sunglasses, he never turned his head away from our car, and I know exactly what his eyes were on.
When we finally got to go through, every guy working, and on equipment watched our windshield when we passed.
Not long after that she woke up and realized what had happened. She acted upset at first, but never pulled her dress back down, and asked how long she'd been that way. It was silent in the car for awhile, and then I began to hear an odd noise, and glanced over at her, she had pulled her panties to the side and was playing with her pussy which had grown quite wet.
She began to question whether or not it looked like the guys had enjoyed what they'd seen, and I told her about the many trucks that had slowed down beside us, and the construction zone. She pulled her soaked panties completely off, and undid the halter, allowing her C-Cup tits to fall free, and then leaned over and began to rub my throbbing (painfully) cock through my shorts.
She pulled it out, and pretty much impaled her head on it, taking it as deep in her mouth as she could and sucking hard. This was quite an experience because normally she doesn't give blowjobs. She stopped only long enough to ask how close to home we were, and I told about an hour, and she went back to sucking the fuck outta my dick. It didn't take long until I felt the stirrings and warned her I was about to cum. She pulled back and jerked me off, letting me bust all over her face, then leaned back against the door, and falling back "asleep" with her tits out, and legs opened wide.
We turned onto the next turn, and almost immediately an 18 wheeler passed us and almost locked his brakes up to pull up beside us. He rode that way for several minutes, and I glanced over at her. She looked so sexy and sl*tty that way with cum running down her cheeks and chin and dripping onto her tits. I looked over at the trucker, and realized he was sweating and driving one handed, so I know he was jerking off. I told her this, and she reached down and opened her pussy up for him, rubbing her clit lightly. He drove beside us for a few moments more, then went on ahead, so I guess he got what he needed
She fell back "asleep" again, and I told her I was going to get some gas and cigarettes and pulled into the first Marathon. She said "Okay, I'm just gonna rest a little longer" and never changed her position. I pumped the gas, and went into the station to pay and get the cigs, and when I came out there were three guys standing by the pump. One guy had his camera phone out and was snapping pics, and when they saw me coming, the dispersed quickly.
I got back into the car, and pulled out telling her what had just happened, she smiled and didn't say anything.
After we got back into familiar territory she retied the halter and covered her tits, and sat up proper, telling me to take a detour on one of the old backroads we used to party on. We found a pull off that was a little secluded, and she climbed into the backseat and told me to fuck her. Sadly after all the excitement of the day, I'd like to say I hit it like a champ, but I was so fucking horny I didn't last long (neither did she either thankfully

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I'm trying to convince her to let me post some pics, but at the current time she won't let me, scared someone that knows her will see them, and the only reason she didn't care before is because we were far from home.
My most convincing arguement so far is that the truckers, or the guy from the gas station will probably post theirs at some point, somewhere.
When I finally convince her to let me, you guys will be the first to know!