The glance as you walk by (grey skirt and jacket, white blouse - the corporate uniform) lets me know where you're headed and what you want.

I give it a full minute, get up from my desk and follow your steps, past colleagues who don't know a thing about our secret-sometime meets.

I walk along the corridor, exchanging nods and smiles, trying to act as casually I possibly can. I reach the door to the stairs, walk through, and begin to climb upwards.

Hardly anyone ever goes to the top of the stairs. There's nothing up there apart from a locked door that allows access to the roof for maintenance. You found it when you were looking for somewhere to have a sneaky cigarette, and even though it isn't suitable for smoking, it's perfect for a quick fuck.

I cough twice as I turn the last bend on the stairs to let you know it's me. You're standing with your back against the wall, your hands behind your back, the sexiest smile on your face.

As I reach you, you slide down the wall until you're squatting, and immediately begin to unbutton my trousers and unbuckle my belt. You've got my soft cock in your hand within seconds, gently tugging and squeezing it, taking my balls in your cupped hand.

You take me in your mouth while I'm still soft, easily fitting all of me, sucking and very, very gently biting down on me.

You've told me that you love feeling me grow in your mouth - going from soft and pliable to hard and rigid in seconds. And it's no different this time. I put my hands either side of your head and push myself into you, looking down and watching you work my dick. I could happily let you suck me off until I cum in your mouth, but you want more than that today.

As soon as you feel I'm hard enough you stop sucking, stand up and kiss me, your tongue wet in my mouth. I kiss you back enjoying the slight taste of myself on your lips.

As we kiss I grip your skirt and pull it up over your thighs. You wiggle your hips to make it easier. You open your legs eagerly, jutting your pussy forwards, almost like you're presenting it to me, and I push my hand down over your stomach and into your underwear.

You are soaking wet.

We don't have long before someone notices our absence. No time for foreplay or pleasantries. We're here to fuck, and to be fucked.

I turn you around until you're facing away from me, your hands on the wall. You bend over slightly, your ass sticking out.

I reach between your legs, take a grip of the crotch of your red panties and yank them hard to one side, freeing your pussy just enough that I can get my dick into you.

I hold it by the base and rub it between your legs, pushing forwards as I do. One second I feel the softness of your lips, the bump of your clit, and the next I'm inside you, the warmth and wetness of your pussy enveloping the head of my dick. And then I drive fully into you.

You're so wet you pussy squelches and pops. You push back against my strokes. My hands are on your hips and I'm fucking you hard.

Somewhere beneath us a door opens. The sound of heels echoes up to us.

I put one hand over your mouth, bite my lip, and keep fucking you. Your pussy is tight and it squeezes and milks my cock. Looking down I see your panties pulled to the side and stretched out of shape over one ass cheek. It's such a slutty look on you. It suits you. It suits the woman who sneaks away in the afternoon to take a cock in a stairway at work.

Fuck. Your ass jiggling and bouncing.

Your breath on the palm of my hand.

How slutty you look.

How hot this feels.

I can't last. I know I can't.

I cum hard, my knees shaking as I empty my balls inside your wet little hole, the last few strokes so powerful and deep that they lift you up onto your toes.

Even as I cum I keep fucking you, feeling my cum and your juices coating my dick, feeling how much wetter you get.

You reach between your legs and I feel you rubbing your clit as I slow down my strokes, pulling almost entirely out of you before inching it all back inside you.

I let go of your mouth, lick my thumb, and press it against your asshole. I don't push it in - just make little wet circles over and around that hole.

You cum almost straight away, your body shuddering, you collapsing against the wall, the side of your face pressed against it. I can hear the effort it takes for you not to make any noise. You snort and splutter and cough.

Another doors opens beneath us. Brings us right back into reality.

You grip the base of my cock and slowly pull me out of you, sliding your panties back into place at the same time so that my cum will fill them.

I put my dick away and quickly button and buckle up.

You pull your skirt back down, smooth out the material, run your fingers through your hair and ask me how you look.

And then you're gone, heading back down the stairs. I watch you go, knowing that by the time you get back to your desk your panties will be slick with my cum.