We're on the train, sitting side by side, and have been for the last four hours. Only one hour to go until we finally get to London and get started with the dirty weekend away we've been promising ourselves for so long. I bite my lip as I imagine some of the things we're going to do to each other. That classy hotel room won't know what's hit it.

The train is busy, almost every seat taken, but as with everywhere these days most of the other passengers are staring at a screen of one type or the other. Not that I would judge - right now the book I'd brought to read on the journey is lying redundant in my lap, and even though I'm not looking at my phone, I am using it to listen to a podcast, the noise-cancelling earbuds in my ears shutting off any other sounds. I'm in my own little world, surrounded by dozens of people also in their own worlds. We're a solar system of solitude.

I'm shaken from my idle musing by my phone vibrating to indicate a message. I lift it, look, and am surprised to see the message is from my boyfriend, Max, who is currently sitting right beside me. We've swapped places a couple of times during the journey, but right now he is in the window seat and I am on the aisle.

I glance at him, puzzled, but he continues to stare straight ahead. I may detect the hint of a smile on his lips, but cannot be certain.

I open the message.

It's an audio file, accompanied by a single word question: Play?

I frown, look at him once more, nudge him with my elbow, but he seems set on ignoring me. So, I do what anyone else would in the same situation, and hit the play button.

The podcast stops immediately, and for the first few seconds it is replaced by total silence.

I'm just about to ruin whatever weird game Max is playing by outright asking him what this is supposed to be, when I hear someone gasp.

That's all it is; a single sharp intake of air. And then silence again.

I think I can hear movement. Something shifting. But it's very distant, very muffled. And there's something else; an occasional crackling noise. At first I think the crackling is caused by a low quality microphone, but as I listen more I realise that isn't the case. It's something else. Something.... wet?

And then the soft, velvet sound of someone exhaling in a way that people only do when they're sexually aroused. It is almost a whimper.

Has Max sent me the audio of a porno?? Is that his game?

I'm just about to pull the earbuds out and ask him when his deep, warm voice fills my head.

Do you remember two nights ago? Do you remember lying on the bed, your legs wide open while I lay between them and licked you?

His voice stops just as suddenly as it started and is replaced by the original collection of sounds. Only this time, I know what I'm listening to.

Here, on a train filled with people, I am listening to myself being given oral sex.

The whimpering, softly moaning voice is mine. The wet, crackling sound is a combination of Max's mouth and my pussy.

Heat instantly floods into my cheeks, and I can feel myself blushing ferociously. It feels like I'm suddenly caught in a spotlight, like everyone on the train knows exactly what I'm listening to. I look down the aisle, certain that people will be staring at me, judging me, thinking that I'm dirty. But, of course, no one is looking at me at all. They're all still focused on their screens, or looking out of the window, or chatting quietly in couples and small groups. For the most part I can only really see the backs of sides of their heads anyway as almost all of the seats face in the direction as mine. The only exception are the people who are sitting at tables, facing back up the train towards me. One woman does catch my eye, but she simply smiles in the quick way strangers do when their eyes momentarily meet, and then glances back down at her phone. There's nothing in her reaction to suggest she can hear what I can hear.

And of course she can't! My reaction has been completely irrational. I can only hear it because I'm wearing the earbuds it's playing through. Everyone else -all these dozens of strangers- have literally no idea of what's currently happening in my ears, or my head, or -i quickly realise as I become aware of a new heat- my panties.

I look back at Max, and this time I'm certain there's a smile on his face. I open my mouth to speak, but close it again without saying anything. I open it once more, but again can't think of the words, and close it.

Without looking at me, Max lifts his hand, gently but firmly grips my jaw, and turns my head back away from him, so that I'm once again looking down the aisle of the train. As he releases me, he drags one finger across my lips so softly that his touch feels like electricity. In my ears I can hear myself panting harder, my moans getting louder as I'm clearly getting close to cumming.

A shiver passes up my spine and I briefly close my eyes in pleasure. This man just knows instinctively where and when and how to touch me. It's like he was born with a "Sexual Me" instruction manual. He's both the love of my life, and the fuck of my life. And yes, I know how lucky I am that I've found both those things in the one man

The soundtrack in my head cuts off abruptly. No longer can I hear my own sexual moans, or the sound of my pussy being licked and sucked and fingered.

Do you remember the last time we went to London?

It's Max's voice again, soft and silky.

Do you remember spending almost an entire day and night in the hotel room, fucking each other? You were so horny. You just wanted me inside you, again and again. You were insatiable. That was the first time I came on your face. Remember? I was fucking you, and you just out of the blue told me that when I was going to cum you wanted me to do it on your face.

I can feel my breathing quicken, my pulse begin to get more noticeable. The headphones I'm wearing seal my ears so well that even normally I can feel the strong, regular beating of my heart, but here, now, it is going in double time. I am suddenly hyper-aware of my pussy, and even though I can't feel it yet, I know that I'm getting wetter and wetter.

When I said I was going to, you pulled my cock out of you and slid down the bed underneath me, until your face was right below my cock. Your timing was so perfect that I didn't even need to touch myself. I just came. I came right onto your face while you held the base of my dick and directed my spurts, moving it slightly so that your entire face got covered. And then after I'd finished you used my cock to smear that hot, sticky cum all over your cheeks and nose and chin. And then you opened your mouth and sucked the last few drops out of me. Fuck, baby. That was so fucking hot. So fucking dirty, y'know? Do you remember how it felt to have your face completely coated in my cum?

I did remember. I don't think Max knows it, but it was the first time I'd let anyone do that. I'd seen it a lot in porn, and I'd wanted to try it for a long time, but he was the first one I'd felt relaxed enough to admit that to.

As he's reminding me of it, I can hear his breathing getting faster and shallower. I wonder if he was masturbating while he recorded this. I think about his dick, his good dick, the perfect size for me. I want to touch it. I just want to quickly touch it, feel it, squeeze it. Only for a second. Nothing anyone would see.

I reach out to do just that, and I'm almost touching it, just a fingertip away from my prize, when he catches me by the wrist and returns my hand to my lap. He presses it down hard and holds it there for a few seconds before releasing me. His message is simple but firm - No.

I don't even have time to feel abashed by his rebuke.

You looked so fucking sexy, so fucking slutty, with my cum dripping off your face. What do you think the people on this train would think if they knew? What would they think of you if they could see you as you were then; naked and fucked and cummed on? Can you imagine how cheap they'd think you were?

And with those words, my pulse ramps up to a whole new level.

Because he knows.

He knows that one of my biggest kinks is the thought of public humiliation.

It's hardly surprising. I was raised in a deeply conservative, and very religious family. Sex was never spoken about. I never even got 'The Talk'. The closest thing to that was my mum telling me that men were bad, only after one thing, and that I absolutely could not end up pregnant before I was married. I didn't even know what the 'one thing' was.

But I did know that girls who wore make-up, and went out with boys were Sluts, and a good girl like me should never, ever want to be one of those.

But I did want. Fuck, I did want very much indeed.

All these good, decent people. What would they think, Anna? What would they think if they saw you with your face covered in cum?

I glance around, my cheeks now burning red, the back of my neck feeling hot too. No one is looking at me, obviously, and yet I feel like at any second they could turn around and look at me with clear disgust on their faces. They'd suddenly know that they were sharing a train carriage with a dirty girl.

Do you think they know you take it up the arse?

My back arches slightly before I know I'm doing it, I gasp and don't know how loud it was, then bite my lip to try to catch the noise. Suddenly I'm very subtly, almost imperceptibly, writhing - circling my lower back and clenching and unclenching my butt, trying to get some sensation of touch to my pussy, pressing my thighs together.

Anna loves it in the arse, doesn't she?

I nod my head quickly, because I do.

Anna loves feeling stretched and used and DIRTY

He almost shouts the last word, and the combination of the volume and what the word is (I fucking love being called dirty) makes me jump. The woman I made brief eye contact with earlier is looking at me. She's the only person on the train who is doing so, but she's definitely looking directly at me. She's got a slightly puzzled, slightly amused look on her face.

Oh fuck, I think she knows.

I try to be rational. There's no way she knows what I'm hearing, no way she knows how I'm reacting. Sure, maybe my cheeks are a bit flushed, but that could just be because I'm hot.

And then Max puts his hand on my thigh and I almost jump out of my skin.

She smiles. She keeps holding my gaze, and smiles. She definitely knows something is happening, even if she doesn't know the details.

Taking it deep up that tight little hole. Taking my entire cock until my balls are pressed against you. Doesn't need to be MY cock though, does it? Dirty women like you will take any cock. You just need to be fucked, don't you? You just need to be used. Listen to how much you need it. Listen to how fucking dirty you sound.

And as soon as he finishes talking, my ears are filled with what I know instantly is the soundtrack to me being fucked. I know it's me because one of the first things I hear is me telling Max to fuck me harder.

His hand on my thigh has a grip of my skirt and he's pulling it up, gathering the material, tugging it upwards an inch or two at a time. I don't even fight him. Despite how inappropriate the setting is, I let him pull my skirt up. I'm relieved that this morning I dressed in a loose, calf-length, pleated skirt - it allows for quite easy access to between my legs.

He pulls it up in a such way that only one of my legs is revealed - the one on the aisle side is still pretty much fully covered. No one looking would suspect anything untoward was happening.

In my ears I can hear myself grunting. Not giving out little ladylike gasps and moans - I'm actually grunting, like an animal, as Max fucks whatever hole he was in when he secretly recorded us. The background noise is the steady, rhythmic slapping of flesh on flesh.

I glance up and that woman is still looking at me. She's around the same age as me (mid 30s), quite pretty, and definitely very interested in whatever the fuck is happening a few rows up the train from her. Her eyes flit down to my ankle, and I've got no doubt she's noticed that my skirt is ever so slightly higher than it was a few moments ago. She looks back up and gives me the faintest little conspiratorial smile.

The fact she's watching, and she knows something dirty is happening drives all the sensations I'm currently feeling up a notch.

Her eyes on me.

Max's hand on me.

The sound of me taking a good hard fucking playing in my ears.

The words Max used.

The train full of people who don't know what a little slut I am.

The fact I am forced to not react to any of this, in any way.

Fuck.

I mean, fuuuuuck.

I know that I can't take anymore. My head is so full of thoughts and sensations, my pussy is so wet I can feel my panties are damp against my thighs, I need to be fucked right then and there. I need that woman to watch while Max bends me over her table and fucks me right in front of her. I want her to tell me what a dirty little girl I am while she helps him get his dick into me and everyone else on the train gasps in horror at what a filthy, nasty, needy, shameless little fucking cum-slut I am.

Fuck fuck fuck fuck fuck

I try to get a hold of my breathing before it runs away with me.

In my ears I'm grunting and screaming, and I know that earbud-me is getting close to cumming all over Max's dick. I don't know how close his phone was when he recorded, but I do know that I can hear my wet, squelching hole taking him deep.

I need to calm down.

I'm almost grinding on the train seat.

I need to remember where I am.

And then, just when I cannot take any more sensations, Max's fingers slip between my legs and find my pussy.

I shake my head 'No'.

No! You can't! No, please no!

I can't bear it. He can't finger me here. He just fucking can't.

I shake my head and look around desperately for something else to focus on, and my eyes meet hers.

My eyes lock onto hers.

And she's nodding.

Just as I'm shaking my head 'No', she's nodding her head 'Yes'.

Max doesn't push his fingers into my panties. Instead, he cups his hand over my pussy, and with just one single finger, he strokes up and down. I feel the soft hardness of that finger right in my fucking soul. Up and down my pussy. Pressing just hard enough that it settles into my groove, but not hard enough that I can cum to it. It is the perfect amount of pressure if your aim is tease a slut who is on the verge of orgasm without actually allowing her to go fully over the edge.

He is both a complete bastard, and a total saint.

I can't cum here. I know that. He knows that.

I look at him and he isn't even looking back at me. He's actually staring out of the window, just another bored passenger looking forward to arriving at his destination.

But his finger continues to stroke up and down, up and down, between my legs, fully following the contour of my pussy, which I know is currently leaking heavily into my panties and down and round to my asshole and, I've got absolutely zero doubt, into the seat I'm sitting on.

I'm a fucking mess. But, I'm a secret fucking mess, and that makes it so much fucking hotter.

I try to sit still.

In my ears Max is calling my a dirty girl, telling me that he's going to cum right into that pussy, fill it right fucking up. He's asking me if I want his cum and I'm screaming YES! OH GOD YESSSS! I'm begging him for it. I'm begging him to cum inside me, and I can hear that I am seconds away from cumming too.

The woman on the train is fully staring at me, her eyes wide with intensity, biting on her lip, and I can see that she has pressed her thighs tightly together.

And that finger.

Up

and down

Up

and down

Up

and down

Up

and I can't. I just fucking can't. I really really really really just fucking cannot.

I push his hand away as I stand up, for a second thinking my trembling legs aren't going to support my weight, pulling my skirt back down as inconspicuously as I can, hoping I haven't leaked through to the back of it. I glance over at Max and he still isn't looking at me, but he does have the widest grin on his face.

Prick

I start to walk down the train, in my ears I am cumming hard, screaming like a wild fucking animal as I walk past the rows of people, hoping the can't hear it, and hoping they can't smell my pussy as it goes past them at almost perfect nose height.

As I approach the woman she's looking right at me, with the most knowing look I've ever seen on another person's face. And I think she does know. I think she knows exactly where I'm headed and why I'm such in a rush to get there.

I'm praying it's empty.

I'm praying I don't have to stand and wait, because I honestly don't think I can.

I honestly, genuinely think that if the toilet isn't empty, I'm going to cum standing upright in the train corridor. I glance back and can see maybe twenty faces, quite a few of them casually looking at me. If that toilet is occupied I'm going to cum right in front of this unassuming audience of fellow passengers, and they are going to see what I am underneath all my key clothes and make-up and manners and decorum. They are going to know what lies at the heart of me.

In my ears my orgasm dies down and fades away. I should remove the earbuds but I left the case back at my seat. I think that's the recording over, and then...

Dirty girl

My pussy clenches around the words.

Dirty slut

Only a few more steps and I'm there.

All these people know what you are, Anna. They can tell that you're a slut.

And I make it and the toilet is empty and I press the button and the door opens too fucking slowly and I'm inside and I'm pressing the other button and I'm scrambling to get my skirt up and my hand is in my panties even before the door closes and my fingers touch my clit and without any further stimulation I'm cumming, and I'm cumming so fucking hard and I'm clasping my other hand over my mouth and I'm falling back against the wall because my legs just don't hold me up against the sheer fucking power of the orgasm that slams itself against me.

Slut

It is ripping through me, my shoulders shaking, my breath taken away completely, my hand not tight enough against my mouth to stop all the noise and my sharp hard grunts are echoing around the little room and I'm biting on my hand to try my fucking hardest to not let anyone else on the train know what's happening.

My slut

And fuck me this is the biggest orgasm I think I've ever had.

My dirty girl

I hold my breath and hold onto the waves of pleasure, enjoying the pressure that builds up in my head as I deny my body the oxygen it craves.

Max is still saying the words he knows I love as my orgasm finally peaks and then begins to slowly fade away.

I push myself away from the wall, but hold onto it with one hand to steady myself until I'm certain I won't fall over. I look in the little mirror and I'm as much of a mess as I thought I might be.

I remember then that I can turn my earbuds off by double tapping the right one, which I do. It's such a simple action, but one that my lust-fried brain hadn't been able to think of when I was walking (staggering?) towards the toilet.

I do the best I can to straighten my hair with my fingers, and adjust my clothes. Not anywhere near to perfect, but hopefully presentable enough for the short walk back to my seat.

It crosses my mind to take my panties off and to maybe dry my pussy a little, but I don't. When we finally get to the hotel in a couple of hours I want Max to see exactly what he did to me.

When I'm as recovered and presentable as I can be I press the button and the door unlocks and slides open.

And she's standing there. Smiling.

The woman.

The woman who, apart from me and Max, is, I hope, the only other person on the train who knows what just happened.

I'm stunned. Actually frozen in place.

I have no idea what she's going to do or say.

And then, her smile widens, and she holds up her right hand, palm facing outwards.

It takes a couple of seconds for my brain to catch on, and then I do what I think it is she's asking for.

I high five her.

She giggles, says, "My turn" and then walks past me into the toilet.

I'm certain that if I turn around I'll see her with her hand in her panties before the door even closes, but I'm too slow, so I miss that sexy snapshot.

Looks like I'm not the only one who got wound up by Max's little game.

I return to my seat, and this time Max is looking directly at me as I sit down.

"Have fun?" he asks, his voice perfectly innocent.

I lean in to him, until my mouth is right up against his ear.

"When we get to the hotel, I'm going to fuck your dick until you think it's going to fall off."

He laughs.

A few minutes later the woman is walking back up the train. She looks at me as she sits down holds the eye contact, smiles, and nods.

A thought occurs to me. I don't know if it's feasible yet, but I lean back in and ask him anyway.

"Max... how would you feel about someone else joining us tonight...?"