Amelie had no idea that it had leaked. Not until everything started.
She entered the subway carriage and as was her habit on the way home from the lab, ignored the empty seats and took hold of the overhead rail. She liked to stretch her legs, to ride the sway of the train, to loosen her taut muscles after her lunchtime squash match and too much sitting in the afternoon.
As the train pulled away she busied herself with another ritual: looking around at the other passengers. She liked to people watch. She started with the fit young college jock reading his football magazine on the nearest seat - attractive but at least five years too young; the business woman sat opposite him, legs crossed, pummeling her Blackberry; the row of grey suits reading papers; the sixth form girl wearing her uniform as provocatively as she could - shirt unbuttoned to reveal the firm swell of her newly-formed cleavage, skirt a little smaller than it should be and showing three inches of thigh.
That was when she first felt it - when her eyes passed over that girl's body, lingering on the small waist, the long tapering neck, the pretty brown eyes. Her pulse quickened. Her stomach tightened. A warmth spread between her legs.
But in truth she was barely aware of these things amid the lurch and judder of the carriage. It was the eyes of the scruffy, bearded builder down the carriage that gave it away. He made no attempt to hide it. He was staring at her chest, drinking in the sight of her breasts.
She had beautiful breasts, she knew she did. She had breasts that drew glances from men and women alike, that boyfriends had loved and worshipped, dreamed of and photographed. But no one had ever stared at them like this - not in public. It was brazen and rude, unnerving.
She glanced down wondering if her blouse had unbuttoned. It hadn't, but she saw at once what had drawn the builder's attention. Her nipples were swollen, pointing upwards through the thin fabric of her blouse, creating sharp peaks, leaving little to the imagination. And only then, when she saw them, did she realize that the friction of the satin was intensely pleasurable. That her nipples were engorged as she had known them only in the wonderful, unbearable tension of good foreplay, with her lover's fingers creeping between her legs, or his tongue sliding up her thigh. It was the kind of pleasure that made her desperate to brush her hand over her breasts, just to feel her fingers catch on her nipples, to feel that delightful resistance and release.
But more than that, it was the kind of pleasure that made her wet. Hopelessly wet. Wet so that she felt it down the inside of her thigh. So that she just had to clench her thighs and her pussy - to feel that sharp, almost unbearable pang of pleasure. And suddenly the wetness was seeping down the inside of both thighs, edging towards the hem of her summer dress.
Jesus, if she didn't get hold of this thing it might even show! She pressed her thighs together but that was the worst thing she could do. She got another shock of pleasure, a deeper one this time, one that made her convulse, her breasts quivering so that they rubbed deliciously against that blouse. She felt her cheeks begin to flush and she pressed her eyes closed. She knew what was coming next.
Oh God, she thought, not here! Not here!
But it was too late. It was already gripping her belly, swelling in her pussy, surging through her body. She glanced about her and caught the builder's eye. He knew, she was sure, and he wasn't going to look away. It was weird, freakish, but something about that was welcome, arousing. For some reason, she held his eyes. Then she clenched the overhead bar and waited for the tsunami to hit her.
It came as the train swerved around a bend, making her hips jerk and her muscles convulse, making her pant and hang helplessly from the rail, bucking as she rode out the aftershocks of pleasure. She felt the wetness between her legs meet the cool air of the carriage and she knew it must be visible, but she didn't care: she was still cumming, still consumed by her pussy. She even opened her legs a little to feel the coolness ride up inside her dress. She didn't care.
Perhaps that was why she let herself groan so loudly. Loudly enough to be heard by the whole carriage. The eyes that were not already on her shifted in her direction, taking in her jerking hips, her erect nipples, her blushing, sweaty skin.
They saw. She knew it, but she didn't care.
It was all she could do to stop herself reaching down and lifting her skirt to slide her fingers into those soaking wet panties. She wanted to reach for the front of her dress and tear it away to expose her quivering breasts, to touch them, to squeeze those bullet-hard nipples. But she didn't. She just gripped the rail and rode out the orgasm, panting and gasping, swinging with the sway of the carriage.