Far Too Long Without a Cum

So, last Friday, the last day in the "box" they threw everything at me they could think of. By the end, I was dripping with sweat, and mentally and physically shattered. The training Captain merely nodded, told me I was good for another six months, then gave me a list of areas I need to improve on. I quite literally staggered across the gantree and found myself in my car, at stupid-o-clock in the morning, driving home. Still, at least I was off for five days, and I figured I deserved a treat. There are times when I quite like being covered in sweat, and it's true to say, I love nothing more than knowing, and I mean absolutely KNOWING my knickers are wet. Mine certainly were, both with sweat and the fact I hadn't cum for ages. As I drove, I reach up my skirt and touched myself. The effect was electric. No way could I get away with masturbating and driving. The orgasm I was going t have would be incapacitating. Idea! What about a motorway service station car park? Public enough for me to find it raunchy. Private enough for me not to get myself raped, and well, who knows.... So, since there's only one service station on that particular motorway, I pulled into its car park and parked a way off in the corner. I was covered on two sides and had a perfect view around me. Bum up, knickers off, legs spread, and the car filled with my scent. Since I knew what I was going to do, my pussy was dripping readily and my clit was already throbbing. My fingers soon found my hole and plunged inside and I gave myself a hard finger fuck to get off the mark. Boy, what I wouldn't give for a cock right there and then. I licked my creamy fingers, plunged them back in my cunt and fucked myself, more gently this time, but building nicely all the same. I looked around. One or two lorries, no one in them. Then I noticed a car pull up and a guy got,out and headed into the services. For a moment I latched onto thinking about him screwing me, but then I noticed he had left his girlfriend or wife (or whatever...daughter?) in the car. It was facing right at me, and if she looked up she would see my top half. He didn't look like he was coming back any time soon, so I thought about this girl. I even let my knee hit the headlamp flasher a couple of times just to,draw her attention which it did. I saw her staring intently at me and I pushed my hand inside y shirt so she could clearly see me playing with my tits. There could be no doubt that she knew I was masturbating. Next, I put my knickers on the door mirror. Now she was open mouthed and staring. Oh, how I wanted her to come over to me. I took a breath and beckoned her. With a quick look back over her shoulder, she scooted out of her car and over to mine. I opened my window and said "please! Watch men." And made sure she got to see me bring myself off to the first orgasm for ages. When I finished, she turned on her heel and vanished......with my knickers in her hand,