My girlfriend Susan and I had been driving across the USA, East coast to West coast for three days. It was midday and we had been on the road since 5am. It was hot, very hot, and the air conditioning in the car was broken. It was cold and dark when we left this morning so we had both put on a long shirt and jeans.

I looked over at Susan and noticed her wiping her brow, "You are sweating like a pig." I said as I watched her.

She undid her seatbelt and looked in the various bags in the back seat for a pair of shorts.

"I have to get out of these jeans, but I can't find my shorts," she said in an irritated tone.

"There is nobody on the road so why not just take off your jeans!" I suggested knowing she never would do so.

“I can’t take this bloody heat anymore. My cotton shirt is soaking through and my jeans feel like they are strangling me. I feel really sick and claustrophobic from the intense heat.” She continued moaning.

She then lifted her feet up on the dashboard, peeled the jeans off her legs and then took off her long shirt. She really surprised me. She sat in her pink g-string panties and white satin bra.

“There are no cars around so I think I am okay in this state of nudity. I feel much better and cooler now,” Susan said in a more relaxed tone.

"That looks much better, but I bet you are too much of a prude to take your bra off?" I dared her.

“You don’t think I ever would do something like that, that’s why you daring me,” she responded angrily.

She quickly glanced at the long empty road ahead, noticing that there were no other vehicles on the road and then unclasped the buckle and let her bra drop off to the side.

I could not help but turn to the side to ogle her. The idea that she was daring and exposing herself like this was such a turn on. It felt so strange having her topless in my car on a public road. She had never been topless in public before, not even on beaches where all the women did that.

Susan said, “It feels so strange being like this. I feel both self-conscious and slutty at the same time.”

I looked at her again. Her c-size breasts were untanned and white in contrast to her tanned hands, neck and stomach. They were large but still quite perky and her nipples appeared quite pinkish red with the tiny little dots surrounding each nipple standing out. I watched Susan as she cupped her breasts and pulled them up and then let them drop free.

"They need some tanning," I commented while peering over again.

I slid my right hand onto her breast and caressed her nipple, twirling it in between my fingers. It had been a while since we had sex and I was horny. It took only a few seconds of touching and Susan’s nipples became erect. I could see that she was getting aroused as she stretched her shoulders backwards and closed her eyes as I played with her nipples.

“This feels so good,” she said.

She put her hands onto my knee and then opened my zip. I had an enormous hard-on bulging out and straining against the jeans. She slowly slid her hands over my erection on top of my undies and grasped it in between her fingers.

I was slowing down as my concentration got diverted. I put my fingers on top of Susan’s cotton panties and started to gently rub up and down in between her now open legs, tracing vertical lines against her labia. I felt her swollen clit through the material. I knew it was screaming to be touched. I touched her pussy on the outside with greater pressure, pushing inwards into her slit. She pulled her knees up and anchored her feet on the seat and opened them as wide as she could to give me easy access to her throbbing, hot and wet pussy.

It was quite a sight having her squatting on the front seat with her legs wide open. I rubbed her up and down for a few minutes and could see a wet spot growing along her pussy slit. I pulled her panties to the side but Susan then pulled them down her feet and off. She now sat with her swollen pussy folds clearly visible. I so wanted to take her then and there and fuck her.

I have never seen Susan be open sexually before and she had never touched herself in front of me. Our sex life was a bit old fashioned and traditional, even you could say boring. Having her exhibit like this was driving me crazy. She was sexed up and slutty and enjoying it and her type-A personality which always stopped any sexual adventure was gone.

She then started to rub slow circles around and over her pinkish nipples as they got harder and longer. Watching her touch herself, sent blasts and volts of sexual tension through me. My cock was desperate to come out and for me to wank it. I reached over to her and with my fingers, touched her naked shaved pussy which was welling up with white creaminess.

She reached over, unbuttoned my jeans and pulled my erect nine-inch cock out of my undies. She stroked my hard-on up and down as best she could while I was driving.

I didn't delay and rubbed her damp clitoris up and down. I glanced again and could see her pink folds glisten in the sunlight shining through the car window. She was moaning as she enjoyed each and every nerve ending point being touched. She started to gyrate her hips up and down to help guide my fingers in towards her throbbing pussy. I inserted one then two fingers into her pussy.

"Let's pull over and fuck, please!" she said.

"We can't pull over here. There is no stopping for next 10km due to construction," I answered.

We had slowed down and with my focus elsewhere I didn't notice the tour bus pulling up behind us. It was overtaking us when I noticed it. I quickly tried to cover up, pulled my hands back from in between her legs as Susan quickly closed her legs and dropped her feet to the floor and covered her breasts with her arm.

We looked up and saw two guys staring from the window of the tour bus. They could see us and had seen us before.

I don't know what came over Susan but instead of covering her tits, she let her arm down, arched her shoulders backwards and sat upright with her breasts perking upwards on full displaying with hard nipples out in the open.

"Yes, have a good look and enjoy!” Susan said in the car.

I looked back at them as they were peering over her luscious body.

"Have you gone crazy?" I asked her.

"I didn't have time to cover up," she answered.

I gathered that some deep repressed psychological inhibition caused Susan to enjoy the attention.

My girlfriend being an exhibitionist revved up my hormones once again.

As the bus passed my car, Susan now sat back and opened her legs wide like in yoga. She flicked her right index finger against her clit. I had never seen her masturbate before. She just didn't care now and this was so unlike her. It was like she had been possessed by a demon. She continued to touch herself now rubbing her folds quite vigorously and moaning quietly. She then took her two fingers and pushed into her wetness again and again.

I had my right hand on my cock and I was pulling it too.

She then took her fingers out of her pussy, leaned over to me and placed them into my mouth. I could taste her salty almost acidic juices.

I really struggled to concentrate on driving. I had slowed down and the bus which I had passed before was again passing on the lane next to us.

I looked up and the guys were glued against the window looking at us.

I quickly covered my cock with my shirt but Susan was rubbing away with her eyes shut. I kept the car’s speed up so the guys in the bus could watch her.

She went still suddenly and then rocked her torso in small vibrations as she let out a long loud groan. She must have been orgasming. She had a smile on her face. I slowed right down to focus on her and let the bus move on ahead.

I was still wanking away when Susan stretched over to me opened her mouth over it, encircling it with her lips. I felt her tongue swooshing around my dick. She then went up and down my shaft trying to milk me. I didn’t need long and I started to ejaculate. My cock was pulsing. She squeezed my balls and my cock jumped up as a dollop of cum spurt out of it. She withdrew her mouth just in time, but my cock spurt again and again throwing cum onto Susan’s neck and breasts.