Gym Masturbation

When I go to the gym I nearly always have to masturbate after. All those hot, sweaty bodies working out. Men in tight shorts with straining abs and six packs. Women in sports bras and skimpy shorts, or naked in the changing rooms. I'm like that, I can't help checking people out wherever I am and I often have a fleeting thought of what it would be like to have sex with them, what they get up to with their partners. Walking around with this thing called horniness is both a pleasure and a pain! So I was at the gym today and it was quiet, just me and two other women in the changing room. I was hot after my workout in more ways than one, having eyed up a sexy gym instructor teaching a girl how to use the rowing machine. Watching his ass thrusting in and out got me quite worked up and I was already planning my solo session when I got home. One of the two girls was showering quite openly in the communal changing room, letting the water run over her firm boobs and washing herself intimately. I watched her maybe a bit too long before I went into my cubicle to undress. My nipples were hard and I was wet. The cubicles are open at the front, affording only a little privacy. The showers are in the middle of the room. From over the side of the cubicle I could just make out the girl still showering, she had been in there ages. I wondered if I could get away with it? I started to stroke my arms, then my breasts. Nobody seemed to be looking. The girl was sideways on and preoccupied with her luxurious shower. I was stark naked and only feet from another stark naked woman. I slipped my hand between my legs. My clit responded instantly, springing up, all hard and stiff. I was stroking myself as I looked at her, and I felt all slippery and dirty and lovely. Then I noticed the other girl. How had I not?! She was in a cubicle directly opposite and looking right at me. She was a curvy girl with big boobs and she was smiling a little shyly. I froze but then she looked right at me and started to stroke her own boobs. She parted her legs so I could see her thin covering of pubes and her pussy. Her clit was also protruding and now she started to rub it, still holding my gaze. My tummy turned over and I started rubbing my own clit faster, looking from her to the girl in the shower. Now, as though she had a sixth sense, the shower girl suddenly stopped what she was doing and looked at first the other girl, then me. She smirked openly. Then she aimed the shower head right between her legs and started to tug and squeeze her nipples as she masturbated with it. I could not believe I was sitting in a gym masturbating with two other women! My hand had taken on a life of its own, faster and faster, and I started to moan aloud as my hips started bucking. I was cumming right in front of them and as I watched the curvy girl lay back flat, her face twisted with pleasure as she was clearly cumming too. Not to be left out, the girl in the shower was thrusting against the shower head, biting her lips and squeezing hard on her own nipples. The whole room was filled with the sights and sounds of orgasm. It was delicious. After we had all cum, there was an awkward silence, then we laughed a little as we got dressed, suddenly modest and facing away from each other. As I left, the curvy girl handed me a piece of paper. On it was written her name, Vicki and her telephone number 'in case you want to go further sometime'. I can't think of anything I'd like more.