I'm in my late thirties; I've been married for seventeen years. Anna is sixteen; no problem there you probably think,but the thing is she was my son's girlfriend.

OK, what got me into this predicament? Porn that's what, good old simple pornography.

I'd built up a minor collection of DVD's over a period of months and years. I had one or two flings over the years but the wife wasn't interested in sex so I kept going back to the simplicity of my porn stash. It was one of my masturbatory soirees that led to my son's girlfriend Anna, catching me mid-wank.

I was having a day off. My son had gone to school and I thought that I had the house to myself. I was all set. The video was playing and I had a whole day stretching ahead with no one to disturb my time.

Perfect.

I was sat in my armchair watching one of the old Color Climax flicks from the seventies. My cock was hard in my fist and I was close to shooting my load.

I was just in the process of using the fantastic technological innovation of jumping between selected frames – thank God for DVD, in the old days of video it was a huge problem over how to time the favourite bit of the film with your ejaculation (yeah, you know what I'm talking about guys) - just as I was about to come I had a weird feeling as though I was being watched.

Now, if you've got your cock in your fist and you're watching porn, you're very sensitive to any subtle atmospheric changes in the environment. I had that strange feeling and I looked up and to my left, towards the living room door, and with a huge jolt of disbelief I saw Anna watching me.

There was nothing I could do. I'd been caught bang to rights. The hideous soundtrack played on as I stared at Anna as she stared back at me. My cock was huge in my fist, but my orgasm had been rudely interrupted.

Half a dozen scenarios played through my mind all at once.

"What the fuck!!............How did you get in?........Fuck!!" I screamed.

It wasn't real, I was imagining this...I hadn't just been caught pulling my cock by my son's girlfriend.

She wouldn't say a word. We could have a cup of tea and talk. I'd explain, I needed sex, everyone masturbated, and I missed my wife...

Anna would soon turn and run from the room in horror. She'd tell my son what she'd seen...

...Oh God, the humiliation... What could I do?

I probably ran through every possibility of what could happen with the sole exception of what actually did.

Anna is a small, slim girl with an exquisite figure. She's very, very pretty and has long legs topped by a beautifully sculpted arse. She wore the current style of clothes so typical of today's Modern Miss. Hipster jeans that complimented her beautifully and showed off her taut, flat tummy. She never openly flaunted her body, but Anna seemed to know how to display it to the fullest advantage, and her small, round breasts always appeared tight and firm, neatly covered by some type of clinging t-shirt.

Anna looked at me through those exotic, made-up eyes of hers for a time as she surveyed me from the doorway. She smiled the most sly, mischievous, blatantly wicked smile I've ever seen decorate a woman's face and I just sat there with my cock slowly wilting in my hand, too stunned to move.

Anna moved towards me in that sinuous way that some women have of walking. I've always loved the way the girls walk, it's a kind of hypnotic swaying of the hips that holds my attention and perfectly focuses my mind.

I couldn't make sense of what was happening. Why was she smiling like that? Why was she coming into the room rather than running away in hysterics?

As she approached, Anna pulled her t-shirt she was wearing, over her head. I briefly recognised it as one of my son's, but soon forgot about the garment when I saw Anna's body, naked for the first time.

Oh my God, she was stunning. I'm sure my mouth just hung open in slack jawed amazement.

My brain still hadn't caught up with events and I continued to sit as still as a statue as though Anna had cast some kind of magic spell over me. Which in a way she had, I was definitely hypnotised by the junction of her thighs. Her plump vulva looked positively edible and the thin strip of precisely razored pubic hair made my previously wilted cock twitch with renewed interest.

"You're a bad man," she whispered quietly. The shock of her accented statement sent an arterial burst of excitement through me as I began to recover my senses.

"How long...?" I croaked. I cleared my throat and continued, "How long have you been watching?"

"Long enough," she replied and fixed me with those disconcerting eyes. "I watched you... like this."

She made the universal jerking off gesture with her fist and rolled her eyes. "To see that... it makes me sexy."

I had always found her sexy, but since she was my son's girlfriend the thought had never developed much more that the realisation.

Now she was naked in front of me and was admitting quite clearly that watching me wank turned her on. Also, the signals were as clear as she could make them about what she wanted; by the way she flagrantly exposed herself to me when she pulled off the t-shirt she'd been wearing.

"Feel me," Anna urged and made her meaning plain by moving her feet wider apart and offering her sex to me.

"Fucking hell..." I whispered almost to myself when I felt the slippery skin between her firm thighs.

Her labia were positively gooey with the syrup that was dribbling from her body. I fingered the loose folds of her labia for a few moments and then smeared a little of her juice over the stiff tip of her clitoris. As soon as my finger touched her button, she gasped. She muttered something  and took hold of my wrist. She virtually forced my fingers into her opening and I took the hint and fingered her firmly.

My cock was erect in seconds, something she noticed immediately.

She moved very quickly and straddled me while I sat in the chair, her knees either side of my hips. With no further foreplay she simply took hold of my shaft and pushed the head of my cock against her opening. She manoeuvred her hips slowly until I was on target and then just sank down onto my cock. I was balls deep in an instant and found myself with her tightly clenching cunt around my cock and her lovely breasts inches from my face.

I did the only thing I could do.

With no thought whatsoever about the morality of what I was doing, of how deplorable it was to stick my cock into the delectable body of my son's girlfriend, I gripped the firm cheeks of  ass and began to lift and lower her up and down my shaft.

Anna got into the rhythm and was soon slamming her body up and down on my cock with vigorous abandon. She was panting and sighing, her face buried in my neck and I could smell the faded scent of her perfume as she muttered phrases of desire and lust.

As we grew more and more excited, our fucking became frantic. We kissed hungrily as though desperate to devour each other. Her tongue was wriggling wildly in my mouth as she moaned and groaned with the intensity of her pleasure.

On occasion she would offer her tits to me for my attention by cupping the little beauties in her palms and almost stuffing her flesh into my mouth.

I was getting close to the point of no return and could feel my semen threaten. I had a brief thought about the consequences of coming inside the girl, but there was no way I was going to pull her off my cock. I was too far gone to care and threw caution to the wind in a huge moment of insanity.

"Ah... I'm... ...Fuck..............Cummmmmming..." I could only mutter briefly as my spunk surged from me.

She became a wildcat when she realised I was coming. She was using her fingers to manipulate her clit as we'd been fucking and I think my climax triggered hers. She grunted hugely and bent her head into my shoulder. I felt her shudder and then felt the sting of her teeth as she bit into my shoulder.

The pain meant nothing as I gripped her ass cheeks and held her on my spurting cock. I knew I'd be gushing a lot of spunk into the girl as I'm quite a heavy cummer, and I'd been interrupted earlier on when I was scant seconds from my climax.

The build up of my excitement from my earlier wanking session combined with the heated fuck with Anna meant that I was extraordinarily aroused and it felt as though I would never stop coming. My climax was intense in spite of the brevity of our coupling and I think it was the same for my nubile lover.

Anna slumped against my chest as her own orgasm petered out. She kissed me lazily and then purred as she basked in the pleasure of her release.

"What have we done?" She asked quietly as she lay against me.

My cock shriveled and plopped wetly from her body as though it too was questioning our morality.

"I was just so excited to see you..." She began her explanation as though trying to make sense of what had just happened; as though by voicing her actions, she could better understand the feelings and emotions that had led her to sit on my lap and fuck me.

I was immediately troubled by her words. Was she feeling guilty? Would she confess to my son? I had no idea what the girl was thinking; I didn't really know her that well.

"I want to do it again." Anna's words startled me.

"What?" I asked in disbelief.

"'To fuck... I want to fuck again. ...Now!"

Anna climbed out of my lap and stood looking down at me.

She turned and walked out of the room. I watched her gorgeous bottom as she wiggled away from me and I admit that the sight of that peach of a derriere made me horny in an instant. All thought and feeling of guilt vanished into the ether and I hastily followed her upstairs.

I found her on my bed, legs wide and with her fingers busy at her cum filled sex.

"Come here." She giggled and crooked her finger at me.

A few seconds later I had Anna's exquisitely wriggling tongue busy on my cock. She was a demon as she slurped and slobbered over my cock. She  murmured endearments and kissed the tip tenderly from time to time and sucked on me like a well practiced whore.

"I love to taste your cock," Anna said, "not too thick but I love it."

She returned to the task in hand and I noticed her cheeks were smeared with the juice from my cock. I looked upwards to thank my lucky stars, I couldn't believe my luck; I had a sixteen year old beauty sucking on me.

I tried to commit it all to memory, every detail of her superbly lithe, athletic body. How her pretty face was distorted by the evil intrusion of my thick cock as she devoured my length gamely.

I was on the verge of filling Anna's mouth with my second load when she must have realised and let my big dick slip from between her lips.

"'You lick my cunt, please?" She spoke, as she rolled onto her back and exposed her slippery, pink opening to me.

I returned the compliment by tonguing at her hard clit and pushing my fingers deep into her cum soaked core. I fingered her vigorously in the way she seemed to favour, She might have given me the impression she was a sensitive female under normal circumstances, but she was a woman who like her sex rough, or at least she did that morning.

I fucked the young beauty again very soon after she'd climaxed intensely on my face. The rolling wave of her orgasm seemed to last for an age as one climax was followed quickly by another, and then another.

We began in the missionary position and found that she loved to kiss with abandon while she fucked.

I was soon pounding at her slender body as her legs were hooked over my shoulders. The angle of my thrusting and the ferocity of my fucking had the girl grunting and squealing as she tried to force more of my cock into her body. I had never experienced such a savage fucking before in my life, she was writhing beneath me and clawing wildly at the bed as we rutted and rolled together.

The second time I poured my seed into her, I had her on all fours and was fucking her like an animal. I had been holding her twisting, frantically bucking hips tightly when I felt myself go and was crouched low over her long, slim, delicately contoured back as my seed spurted into her again. I held her around her waist with one hand so that she didn't writhe away from my spitting cock and with the other hand I mauled at her tight tits roughly.

We laid back on the bed when we finally collapsed into the ruin of the rumpled and stained sheets. I looked at her as she lay completely unashamedly with her legs wide apart and my goo trickling along the crack of her arse.

"'We will have to fuck some more, yes?" She said, and I nodded my head eagerly.

I'd be more than happy to fuck such a delectable creature again, whenever she wanted, I was hooked.

Of course that was the first day.

Now, weeks later I'm having awful regrets. Anna has become a drug to me, I  was addicted and I couldn't give her up. We had taken some huge risks, reckless chances that were only seconds away from us being discovered and of course this has only heightened my desire for the girl.