Behind Closed Doors - Cover

Behind Closed Doors

Copyright© 2017 by jack_straw

Chapter 1

Incest Sex Story: Chapter 1 - Beth Chastain and her son Mark are hiding a burning passion. Usually a quiet, somewhat shy person, Beth has a well-hidden inner slut, the devil inside that created her son in the first place when she was a naive teenager. The slut has been clamoring to get out again, and she's zeroed in on the man Beth loves over all others, behind the closed doors of their small house.

Caution: This Incest Sex Story contains strong sexual content, including Heterosexual   Fiction  

Beth Chastain and her son Mark lived a quiet life in a quiet two-bedroom house on a quiet street in a quiet neighborhood in a quiet suburb in a quiet Southern city.

Beth and Mark were both quiet, unassuming people, often shy and somewhat introverted, and as mothers and sons go, they were extremely close. Maybe too close.

Because pressure was building in the little house that would soon explode in a white-hot passion that would change their lives forever.


Beth had grown up in a small town about an hour away from the city where she and her son now lived, the middle child in a working-class family. She had an older sister and younger brother, both of whom were far more outgoing and achievement-oriented than she was.

Allison, her sister, was talented musically, with an excellent voice, and took an interest in theatre, especially musical theatre. Her brother Charles – or Charlie – was an athlete who was successful in sports all the way into college. And both were Honors students.

Their parents, naturally, tended to spend more time and effort at her siblings’ events, and, as such, she tended to fall through the cracks growing up, plus she was late maturing.

Indeed, most Saturdays and many Sundays from the time she was about 8 until she was almost 16, she spent alone.

While the rest of the family followed her brother and sister to sports games or recitals, Beth stayed at home, either reading or wandering the outskirts of their town.

She found several private places near the river and in the woods behind their house where she could read, write, draw pictures or just watch and listen to nature.

She would try to listen politely when she was taken to Allison’s various performances, but her mind would usually wander far afield before very long.

And on the rare occasions when she got dragged to Charlie’s games, she roamed the premises looking for quiet, out-of-the way places to be alone.

No question, she felt most comfortable as a wallflower, and that self-perception persisted even when she finally grew some boobs, her face matured and her body became more that of a woman and less like a girl.

She actually became quite pretty, with lustrous hair that was a mahogany brown color, with a large dose of auburn.

Physically, she was average sized, about 5-foot-3 or so, and slender, and her breasts and behind were both on the small side, although she would grow into a B-cup after she had Mark.

Beth was a bright, inquisitive girl, but she didn’t care for school work, and getting top grades was not a priority for her, unlike her brother and sister. She figured she could make B’s and C’s with minimal effort, and that was fine with her.

She had an extensive and eclectic library of books, and much preferred their company to other people her age, although she started to come out of her shell a little in her senior year of high school.

What nobody knew at the time was that behind her shy, introverted exterior, Beth harbored a deep welter of desires.

She watched her older sister going out on dates and having boyfriends, and it fueled her vivid imagination. And, as she got older and started to mature, her imaginings often turned to sex. She created lurid fantasies in her mind that she used once she learned to pleasure herself.

Of course, she was too shy and proper to let those fantasies come to life. At least not until the summer after she graduated from high school.

Beth had two girlfriends from the neighborhood she’d known all her life, and one of them had developed a bit of a wild streak. She started encouraging Beth to loosen up and party a little, and at that point in her life Beth was ready to be a little rebellious.

She started going out with this friend, that her parents trusted, and the friend began to introduce Beth to alcohol and weed.

No question, Beth liked the high, liked being out with her friend, who was more outgoing and popular than she was, and liked the attention she started getting in a new, different environment.

Beth’s friend procured her a fake ID to get them into a few of the bars in their small town, an atmosphere she didn’t care for, and to house parties, which were more her style.

It was at one of these parties that she met Michael Murray, a friend of her friend from another part of the county. He was a couple of years older than Beth, and he sized her up as fresh meat.

Beth had been on a couple of dates her last year of high school, but she was still very naïve about relationships and dating, and she was still a virgin.

It was Michael who became the first – and until the events of this story – the only man who had been able to tap into Beth’s deep well of sexuality, who opened the door and showed her what sex was really all about.

Michael pursued her with a single-minded determination to pluck her ripe cherry, and it didn’t take him long to succeed.

Of course, her sister was alarmed when she saw Michael Murray coming around to date Beth. She and Michael were the same age, and even though they’d gone to different high schools, he’d gone to her middle school, and Allison knew of him as a con artist and a pussy hound.

Allison knew he was up to no good, but she was powerless to stop her sister from taking such a risky move. But it was already too late.

Sure enough, Michael got Beth drunk and high one night, then blew her mind with the kind of animal sex she’d only fantasized about before.

Beth was like a drunkard in a liquor store; once she got a taste of pleasure, she wanted more, a lot more. She quickly grew to love Michael’s big cock, and what he could do with it.

She was insatiable during this period of her life, what she was later refer to as her slut period, and Michael took full advantage of the naïve teenager’s exploding lust.

Somehow, Michael got her to where she’d do anything he wanted her to do sexually, and that included several occasions when Michael brought his friends in to fuck his horny girlfriend.

At least twice that she could remember, Beth found herself drunk and high with a cock in each of her holes, sending her lust soaring into the stratosphere. At first, she had balked at anal sex, but like everything else, Michael led her to an appreciation of a big cock in her ass.

For about three months, Beth carried on a torrid relationship with Michael Murray, until she ended up pregnant. She had just turned 18.

Michael, of course, denied that he was the father, even though he’d never once fucked her with a condom. Of course, the fact that she’d let him share her with his friends reduced her argument that he and no one else was the father of her baby.

Beth’s father was furious, and only the intervention of her mother prevented her dad from kicking her to the curb.

Her sister and brother were both disgusted with her, but her mom was sympathetic. She made the argument that if they had paid more attention to Beth when she was younger, instead of treating her like the furniture, maybe she wouldn’t have gotten in trouble.

There was no question that she was going to keep the baby, and while her dad made noises about her giving it up for adoption, Beth never seriously considered it.

And she made a vow as she held her new-born son that she would live for him; that he would get all the love she could give.

It was probably just as well that Michael Murray slithered out of her life. A few years later, he was caught having sex with a 13-year-old cousin. While in the county jail awaiting trial (he was unable to bond out), he was beaten up at least twice.

Once the case came to trial, though, he was acquitted of statutory rape. Turned out the now 15-year-old cousin had initiated the encounter, then got up on the witness stand and told two different versions of what happened at different points in her testimony, and both were at odds with her original statement to the sheriff’s department.

As one juror put it after it was over, “We knew he did it, but we agreed that we couldn’t believe anything that came out of that girl’s mouth, and without her testimony the state couldn’t prove beyond a reasonable doubt that it happened. We didn’t have any choice but to acquit.”

Being acquitted gave Michael a sense of false bravado for a few weeks, and he started asking around town about Beth, thinking about possibly rekindling their relationship, not knowing that she had moved to the city.

Charlie Chastain disabused Michael of that idea in no uncertain terms. Charlie cornered Michael outside a bar in town, worked him over for a few minutes, then advised him to leave town, go far, far away, and leave his sister and nephew alone.

Both he and Allison had patched up their relationship with Beth somewhat, but their initial response to her pregnancy drove a wedge between her and her siblings that has never been bridged.

Beth moved to the city, both for the greater opportunities and to escape the whispers and disapproving looks from the people in her home town, and her family. She went to secretarial school, while her mom kept the baby, then went to work as a secretary and receptionist at a succession of businesses. She had been secretary to a CPA for seven years when her son approached his 17th birthday.

Mark Chastain grew up to be a fine-looking young man, of average size, with the same mahogany brown hair and flawless skin of his mother. Like Beth, he was bookish, and like his mother, he tended to be shy and somewhat introverted.

Beth doted on her son, but she tried not to spoil him. It wasn’t easy. They went everywhere together, to the park, movies, restaurants, and small trips, whatever they could afford.

She disciplined her son on the rare occasions when he made mistakes, and all she really needed to do was express her displeasure over something he’d done, or not done, and his remorse was genuine. Mark grew up always wanting his mother’s approval.

Although he was never a real talented player, Mark took an interest in sports, especially soccer, and he played soccer and baseball from the time he was 5 until he turned 15.

And every single time he took the field, Beth was there to cheer him on. She made it a point to learn about the games Mark was interested in, although some of the rules remained a little arcane to her.

One of the things Beth drilled into her son’s head was to take an interest in his schoolwork, more so than she had, that education – getting decent grades – was the key to success.

Mark’s sports and school were the only real social outlets Beth had, and what acquaintances she had were through those two facets of her son’s life. That was the only social life she believed she needed.

As he grew into a young man, Mark found he could talk to his mom about anything and everything. And one of the things they talked about more and more as Mark got later in his high school years, was the issues they each had with the opposite sex.

Being on the shy side, Mark found it difficult to relate to or approach the girls at his school, and he went to a very large public high school where he tended to get swallowed up and overlooked.

For her part, Beth had learned from her encounter with Michael Murray that men were not to be trusted, that they would use you and betray you if given the opportunity, and that even included her father and her brother.

Only her beloved son was worthy of her trust, and the lion’s share of her love. And, as these things sometimes do, love morphed into lust.

Living alone together in a small house with just one full bath, Beth and Mark constantly saw each other in various stages of dress and undress.

She recalled that Mark’s junk had been impressive as a baby and toddler, and sometimes deep in the night, her fantasies would run wild about her handsome son.

Beth never lost an interest in her lurid, forbidden fantasies, or as she had come to call it, her inner slut, the devil inside; she just kept a tight clamp on her fantasies to keep the slut safely locked away after Mark had come along.

Nevertheless, she still had needs, so she bought herself a relatively inexpensive laptop where she stored a rather extensive array of porn, most of it hardcore bordering on extreme.

When the internet had become the thing, she had started surfing for porn, and had eventually carved herself a quick, easy, and relatively safe path to her favorite porn sites, where she had downloaded images, film clips and erotic stories to a series of folders on the desktop.

At first, her interest was in simple straight sex. But as Mark got older and matured into a good-looking man, and as her lurid fantasies increasingly focused on her son, she started delving into incest porn.

Many of the stories and scenarios she encountered on those sites were ludicrous. But others had the whiff of possibility. Beth would chastise herself about her predilection in the cold light of the day.

But at night, when she was alone with just her thoughts and fantasies, her inner slut would grab her and hold her through sweaty nights, where she’d wake up with her panties off and the sheets bunched up between her legs.

Things started happening between them not long after Mark turned 16 in June the previous year. The two of them had gone on a real vacation, to the caves and hills of eastern Tennessee. Mark was interested in geology, with a collateral interest in spelunking.

The conversation on their drive to the mountains was spirited, as always, but they also talked increasingly of relationships.

“Mom, why don’t you ever go out on dates?” Mark asked.

“I do,” she replied. “I go out with you all the time. That’s all the dating I need to do. Besides, I’ve told you. I don’t trust men. Except you. I trust you. You’re my baby.”

Mark looked over at his mom, and not for the first time thought how beautiful and sexy his mom was, and how lonely she must be.

Later, when they went down to the pool at their motel, Mark was pleasantly surprised to see his mom come out in a tight one-piece suit that, frankly, was more revealing than a skimpy bikini.

There were no cups on this suit, so her little B-cups with the tight little nipples were showed off to maximum effect, and the legs were cut high on her hips, leaving all her thighs and most of her pert little butt exposed, and only a thin strip of nylon covering her crotch.

Likewise, Beth was pleased to see her son with some definition to his body. They had recently joined a gym – something else they did together – and the results on both of their bodies was noticeable.

But what got her attention was the cock hanging between her son’s legs, outlined perfectly in his wet shorts as he exited the pool. Fine piece of meat, she mused, just like his father.

Of course, a week in close proximity brought with it a renewed intimacy between mother and son as they spent their nights in the motel room.

Mark tried to be quiet at night when he started stroking his dick, while Beth lay on the other bed pretending to be asleep as she quietly fingered her boiling-hot pussy, listening to her son try to masturbate quietly.

And there was also the day they went deep into a cavern with a hired guide. Mark and Beth often found themselves in close quarters, their bodies pressed together in a confined space.

Both Beth and Mark would look back and say that was when the dance of seduction started, but it took some time for it to develop.

From that point forward, Beth and Mark made a conscious effort to look good for the other. They both kept up with the gym routine, both styled their hair in a manner the other liked.

Beth had to dress nicely, but conservatively, for her work, but when she was out with Mark, her clothes started getting a little tighter, the skirts a little shorter, the blouses a little showier, and she added some pizzazz to her makeup, using eye shadow and ruby red lipstick.

Her tits really didn’t need a bra for support, so often she went without one, especially through the summer and into the fall.

Mark definitely took notice. He had always worshipped his mother, but now he began to see her as the sexiest woman on the planet, and one to be desired, longstanding taboos notwithstanding.

That Christmas, they almost crossed the line.

It had been a stressful day. The weather had been bad, rainy and cold, but they still had to go to her parents’ place for the holiday.

Despite living less than an hour away from her hometown, Beth didn’t visit her parents all that often, and family gatherings, usually for holidays, could be tense.

When Mark had been younger, they had often stayed over Christmas Eve, but when her brother and sister moved away, started having kids and thus needed the extra beds, it made sense for them to just come over in the morning for presents and Christmas dinner.

And it had not been a particularly joyful day, although the adults put on a façade for the children. Beth’s father was sick, cancer, and the prognosis wasn’t good. In fact, he had less than four months left, although no one knew that yet.

Beth had been in a somber, reflective mood during the white-knuckle drive back to the city in a steady rain. Mark, meanwhile, was contemplating the special Christmas gift he’d gotten for his mother, which he was going to present when they made it home.

Even though the mood was kind of down as they entered the house, Mark couldn’t help but admire his mom’s legs and butt as they were encased in a pair of tight leggings. Her dark hair was tousled from the cap she’d worn and her cheeks were still rosy from the cold.

Beth got the heater going, turned on the Christmas tree lights then fetched a glass of wine from the open bottle in her fridge. To her surprise, Mark had dimmed the lights in the front room and put on some Christmas music.

“Mark, honey, haven’t you had about enough Christmas?” she said teasingly. She appreciated his effort to lift her spirits.

“There was one gift you didn’t open,” he said quietly, almost hesitantly, handing her the professionally-wrapped package.

“Mark?” she said as the opened the present and found a box from a prominent lingerie shop. Inside was a simple negligee, waist-length with spaghetti straps, with a matching pair of loose-fitting boy shorts. Also in the box were a couple of skimpy bra-and-panty sets, with both thongs and regular bikini panties.

“I want you to look sexy when you start going out on dates,” Mark said softly. Beth was having reckless thoughts as she gulped down the rest of the wine in her glass.

“They’re beautiful, but...” she started to say. She turned to refill her glass, suddenly aware of a growing tension in the room.

“Mom,” Mark said, as he came up behind her and put his hands on her shoulders. “You need to start getting out more. You’re a beautiful, sexy woman. It’s not right for you to sit at home like this.”

“Why?” she said as she turned around, suddenly slightly irritated. “Why not? So some man can use my body and toy with my heart? No thanks. I’d rather have you.”

The comment hung in the air like a loaded missile, and Beth realized that she had turned around straight into her son’s embrace. They stared at each other, their faces inches apart, their lips parting, as if waiting for a cue.

Then, realizing what was happening, Mark backed away, but not before he realized that the tip of his dick was wet from his mother’s closeness. Beth too had noticed as Mark had started to become aroused, and she decided to push the envelope.

“Would you like to see me in the negligee?” she asked softly. “Isn’t that why you got it for me? Why don’t you get comfortable, and I’ll put on a little fashion show. You won’t be disappointed.”

Mark was confused as he retreated to his little bedroom to change into some sweatpants and a loose t-shirt.

Was his hot, sexy mom really coming on to him? And how did he feel about that? Silly question. He was elated, but also apprehensive. He was well aware of the taboos against sex with one’s mother, and he’d studied the subject enough to know that it would be extremely risky.

Nevertheless, the thought of getting his virgin dick in his mom’s hot, tight pussy was invigorating. As he flicked off the light in his bedroom after changing, he decided to let his mom set the pace and see what happened. He’d go as far as she let him.

He sat on the sofa and turned on the TV, to see what might be on. He’d picked up the morning paper and was idly thumbing through it while listening to an NBA game from the TV, when he heard a soft, “ahem,” coming from the hallway that led to the bedrooms.

Mark was transfixed by the vision he saw there. The nightie fit Beth perfectly. The satiny top hugged her chest, revealing her perfect tits, with the stiff nipples poking into the material, and the bottoms were snug around her hips but loose around her legs.

Beth had taken a quick shower, to wash the day away, physically and emotionally, so her hair was still wet and a little wild.

While she was usually fastidious about her hair, this time she didn’t care. She liked it being slightly out of control; it fit her mood.

Mark’s cock was tingling and stiffening as Beth sashayed into the front room. He clamped his legs together to try not to let his arousal show, but it wasn’t easy.

Although he had seen his mom in her panties and bra plenty of times while they were dressing for work, or for some event they were attending, he had never seen his mom look quite like this, and it was intoxicating.

As she strutted into the room, Beth’s heart was beating wildly. She saw the look of lust in her son’s eyes, and she could see him trying to conceal his hard-on.

“So, what do you think?” Beth said, with just a trace of nervousness. “How does your old mom stack up against those hotties at school?’

“Are you kidding?” Mark exclaimed. “You’ve got them beaten by a mile. They’re just girls. You’re a woman.”

“You say the sweetest things,” Beth sighed as she sat down on the sofa next to her son, and snuggled up against him. “I’m lucky to have you.”

In the position where they were sitting, Mark had a nearly-unobstructed view of his mother’s tits. The top to the negligee was low-cut anyway, and the way Beth was sitting, it hung a little loose and slightly open.

Beth could see Mark getting hard, and she was so, so tempted to reach down and touch it, to make it harder, to make it cum for her. She could feel the inner slut trying to escape, but she wasn’t quite ready to let her loose.

They sat like that companionably, until Beth shook herself and backed away mentally from the temptation.

She was still constrained by ancient taboos, and, more to the point, although she saw Mark’s arousal, she was still worried how he would really feel if she tried something, or how they both would feel in the morning if they succumbed to pleasure that night.

“I’m sorry, Mark,” Beth exclaimed hastily as she stood up from the couch. She’d had two glasses of wine already, and she was afraid if she had another, her defenses might be lowered even further.

“What do you mean?” Mark said, a little flustered himself.

“I’m just ... I’m just sorry,” she said. “I’m going on to bed. It’s been a long day. And...”

Mark would wonder for quite a while what his mother started to say at that moment, and what she had to be sorry about.

“Good night, son,” Beth said as she bent over to give Mark a kiss on the cheek. “Be sure to lock everything up and turn out the lights.”

As she did, her top gaped open and gave Mark a clear view of his mom’s tits. It was just for a moment, but it was enough to sear itself on his memory. They were perfect, tight little orbs with a pair of pink – and very hard – nipples sticking out of areolae about the size of a nickel.

“Um ... OK, Mom,” Mark stammered. “I love you.”

“I love you too, baby,” she answered.

Beth couldn’t help seeing where Mark’s eyes had been drawn and she felt a flush rise from her chest to her face. Yes, indeed, she needed to go to bed. To bed, with her Christmas present to herself, a nice fat 8-inch dildo that she had ordered from an on-line retailer.

She thought about getting her laptop out and masturbating in her desk chair while riding her new toy, but decided against it. She knew what she was going to fantasize about this night as she worked the fake cock deep in her now-needy pussy.

Beth had tried dating for about a year when Mark was 3 going on 4. She had just finished school and started her first job, so she tried to be sociable at work. She had gone out with co-workers and other acquaintances, both for fun and for dates.

She was careful about her alcohol intake, and generally her demeanor when she went out was the same demure Beth she was at the office.

She had been listening to her family tell her that Mark needed a father, or at least an adult male influence, in his life, and this was her response.

But nothing had come of them. Most of her dates were just out for fun and shied away at the mention of her child, and they were often cold and cruel about it, especially when they weren’t getting any sex out of it.

A couple, however, had accepted Mark and had thus progressed to the point where she had consented to sex, and it had been very underwhelming.

Neither one had been able to unlock Beth’s inner slut, because of a size deficiency for one and poor technique from the other. The one couldn’t hit the hot spots deep in her pussy, and the other didn’t believe in foreplay and was one and done in under three minutes.

After a frustrating New Year’s Eve spent with a date that fizzled out, Beth had made a resolution that she would forego men and devote herself to her son.

She’d had trust issues with most of the men she dated during this period anyway, so it was no stretch for her to simply swear off dating and sex, and spend as much time as she could with Mark.

She didn’t learn for a long time that her brother had run off Michael Murray once and for all, or things might have been different.

The bottom line was that at that point it had been 12 years since she’d been laid. But that hadn’t stopped her inner slut from tormenting her with lurid fantasies, and now those fantasies were focusing in on the one man she knew she shouldn’t have, her own son.

Nevertheless, Beth decided to stay in the satin outfit she was wearing, rather than strip naked. After all, it had come from her son, and if she was going to wallow in her forbidden fantasies, that would play into it.

She lay under a sheet caressing the flesh-colored dildo as she slid a hand inside the leg of her pants. She slid a finger along the outside of her slit, and gasped as bursts of sensation exploded from her still-wet, still-needy pussy, along with a small flow of her juices.

Beth circled her throbbing clit with her middle finger, then rubbed her fingers briskly over her flooded cunt, and the dark hairs of her trimmed bush were quickly damp with the rapidly-increasing dew of her arousal.

“Oh, Mark,” she whispered, pretending her son was in bed with her. “Lick my pussy, please, fuck me with your big hard cock.”

At that moment, Mark was lying back in the recliner in front of the TV, from which the NBA game continued to air. His left hand was inside the waistband of his sweatpants, slowly stroking his half-hard cock and contemplating what had transpired that night.

What had his mom meant when she’d said, “I’d rather have you?” Did she really want him to fuck her? Had she started to suspect how much he’d been obsessing over that very thing through most of the previous year?

He was certain she’d been very close to touching his cock; he’d seen the way her hand had hovered over his crotch as she’d sat next to him – real close, so their bodies were touching – and the way she had abruptly pulled it away.

He’d noted the guilty look on her face as she’d stood up to tell him good night. And, of course, he was sure she’d deliberately flashed her tits at him as she leaned over to give him a goodnight kiss.

Certainly, the man in him wanted to fuck his mother, but he was afraid of how it might change their relationship.

He loved his mom more than anything in this world, and he didn’t want to do anything to jeopardize that relationship, even if it meant denying himself the one thing he wanted more than anything.

And why did he want to fuck his mom, when there were pretty, willing girls his own age? Simple, he rationalized, she was a beautiful woman, first, a woman not a girl, as he’d told Beth earlier that night.

But for another, it was the fact that he knew she would never break his heart. She would always be there for him, and he couldn’t be sure about some strange girl in this anonymous city.

And as he thought about it all, thought about the possibility of fucking his sexy mom, his cock stiffened under his idle stroking.

Abruptly, he turned off the TV, locked the house, turned out the lights in the front room, leaving just the light over the kitchen sink on, as they always did.

He paused for a moment outside the door of his mom’s bedroom and listened carefully, and he thought, maybe, he heard Beth in her bed moaning softly.

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