"I'm home mum!" Kevin called as he shut the front door and wandered into the living room, kicking off his soccer boots as he did so. "Mum?"
Generally, his mother Julie was in at this time, late on a Sunday afternoon, but she didn't seem to be around.
Shrugging, 13-year-old Kevin headed up the stairs. He was dying for a piss, and cursed to himself when he saw that the door to the bathroom was closed. He could hear the unmistakable sounds of someone in the bath.
"Mum?" he called from outside.
"Yes honey?" Julie responded from the bath.
"Are you going to be long in there? I'm gaspin' for a pi...a wee."
"I've only just got in," Julie said, "Just come in anyway. The doors not locked."
It sounded a little strange, entering the bathroom whilst his mother was bathing, but his bladder was fit to burst, so he didn't have much choice. He opened the door and walked in, instinctively looking across the large bathroom to where his mother was. The bath was full of soapy water which protected her modesty, but the ample breasts of the blonde 35-year-old were almost breaking the surface, the deep cleavage visible, the nipples just below the frothy water line.
"Hiya Kevin," she smiled across the room.
"Hi mum," her son shyly replied, dragging his eye's from his mum's almost-visible breasts to her face, then to the toilet which he rapidly approached. He was wearing his soccer kit still, and tugged the shorts halfway down his thighs, followed by his underwear. Relief surged through him as he urinated.
From the bath, Julie admired her handsome young son, the only good thing to come out of her brief marriage in her early twenties. Kevin was slender, and had short blonde hair similar to Julie's. She admired the boy's toned young legs and his cute bum as the lad stood and pissed.
"How was soccer practice?" she asked.
"Fine," Kevin responded, "I scored three goals."
He naturally turned to his mother to speak, and Julie had slightly raised herself, just enough so that her nipples now broke the surface. She was 5-foot-3, average build and with tits to die for. They were large but firm and shapely, as was her slightly plump bottom. Since her divorce 8 years ago, she'd had few sexual relations, but her appetite for fucking was beginning to creep up on her the last few months, and being a devoted, working single-mother, she'd had few chances of getting out and meeting a man. Though a little voice in her told her she was being perverted, Julie had been unable to resist admiring her growing young boy's body, realising he was indeed growing up after she'd found those porno mags under his bed (she'd placed them back into their hiding place with a knowing smile).
Kevin finished pissing and flushed the loo, pulling up his underwear and shorts.
"Could you fetch a towel over for me honey?" she asked.
"Hmm? Oh sure mum," said Kevin, and took a large towel from the radiator and walked over to the bath.
His eye's went straight to her lovely big tits, which attracted his attention despite his reservations about eyeing up his own mother.
"Thank you sweetheart," Julie said, and took the offered towel and dried her face, the act of raising her arms lifting her tits up further, the whole lovely melons out of the water, glistening and soapy.
Julie dropped the towel on the floor and looked up into her son's wide eyes.
"Do you think your old mum's still nice looking," she grinned.
"Yeah," Kevin responded, "I mean...you always were. You still are." He smiled nervously.
"And you're such a handsome young boy," Julie said soothingly. There was an unmistakable stiffness in her only child's shorts, and the mother was unable to resist reaching out and place her hand over the lad's groin.
"You're growing up too," she commented, stroking the boy through his shorts, then, with her other hand, gently slid the boy's shorts and underwear down once more to his knees, revealing a sparsley haired groin. Kevin's prick was naturally small, given that he was only in his first teenage year, but the four-and-a-half inch member jutted out proudly, rock hard and veiny, the head swollen and purple. Julie gripped it and began stroking the foreskin back and forth.
"That nice?" she asked.
Kevin just nodded. It felt damn strange, his own mum jerking him off, but he'd never been anywhere close to having sex with a girl or woman, and the curious feeling of another hand stroking his prick sent ripples of thrilling joy through him.
"Very nice," he said eventually.
"Just tell me if you want me to stop," Julie added, masturbating her son a little longer before leaning in and taking the boy's cock in her mouth. She sucked it slowly, savouring the taste of such lovely, young meat in her mouth. Kevin still felt guilt and shock at this act, but as he stood with his arms hanging by his side, he felt unable to pull out. In fact, his hips operated independently of his reluctant attitude, and he was slightly thrusting to and fro, actually fucking his mum's hot, wet mouth.
Julie could sense her horny young son was approaching orgasm, and she sucked harder, moaning inwardly, desperate to taste the lad's sperm.
"I'm..." began Kevin, then stopped, unable to bring himself to say 'spunking up' in front of his mother.
Julie knew anyway what the boy meant, and she thrilled in the feeling of the throbbing cock in her gob beginning to spurt. Kevin was panting and moaning as his climax shot through him, his dick pounding madly as it pumped thick salty spunk into his mother's mouth. Julie swallowed it as fast as it came, sucking on after the flow had died down, sucking out every last drop.
Finally, she pulled her head back.
"Thanks," Kevin said, unable to think of anything else to say. His libido had seen him through his guilty feelings at getting a blow-job from his mum, but now he'd cum he felt a little anxious.
"You're welcome," Julie replied, "Now, do you want to go and get changed? I'll leave the water in the bath for you if you want one."
"Sure mum, thanks."
Kevin stepped back, pulling up his shorts, before leaving the room.
Julie sat back and smiled to herself, savouring the experience and the taste of what had just happened. There was no doubt her son was a little freaked out by it, which was fair enough. She wanted a repeat of the performance though, and possible the chance to go a bit further, but it would have to be if Kevin wanted to.

Later on, Julie and Kevin sat on the sofa next to each other, watching TV. Both had the afternoon's events on their mind, but neither had said anything regarding it.
Julie was hopeful though; Kevin had seemed to be trying to summon up the courage to say something for the last hour, often making eye contact with her before just smiling and looking back to the TV. Julie decided to wait.
Eventually, Kevin found the courage and turned to his mother.
"Mum?" he began.
"Yes darling?" Julie responded.
"About this afternoon. You know...that thing you did?"
"Yeah," Julie nodded.
"Shall we er...you know...do it again. Would you like to?"
"Sure. I enjoyed it. Did you?"
"Mmm," Kevin nodded, "It was fun. But er...wasn't it wrong? I mean, guys shouldn't like, have sex with their moms. I'm sure."
"It wasn't really sex," Julie explained, "Not full sex. Just a bit of mutual fun. That's okay."
"It is?"
"Sure. Sex is only er...vaginal intercourse. You've done about sex in school yeah?"
"Yeah. Last month."
"Well," continued Julie, "Full sex is full intercourse. If we do other stuff it's no big deal. Just having fun. No problem."
Kevin was happy with this; he felt suddenly even more eager to have his mum suck him off again. However, Julie had a sudden idea.
"What we could do," she began, "Is to have anal sex. You heard of that?"
"I think so," Kevin replied, "I saw er...magazine. A friend had one. Anyway, it featured that. Anal sex. It's where a guy put's his dick up a woman's bum isn't it?"
"Sure is. Shall we try it?"
"Okay. It's not like sex though is it?"
"Not proper sex," Julie reassured her son, "It's just mucking about, having fun without clothes on. Like this afternoon. C'mon."
She got up and Kevin did likewise, both eagerly heading up the stairs and into Julie's small, cosy bedroom.
"Wanna get undressed?" she invited her son. Kevin began stripping, looking over as his mother did so too.
Soon, they were stark naked, admiring each other. Kevin was slim but toned, his body blooming towards adulthood but still with great evidence of his youthful status. Julie was delightful to look at for Kevin. He'd noticed his mum's nice big tits before, but seeing them totally bare in front of hi was great. She was fairly slim but with child-bearing hips and, when she turned to her dressing table, revealed a nice, shapely, rounded pair of buttocks.
Julie took a small tub of vaseline from the table and walked over to her son, scooping some out and smearing it on the boy's stiff little cock.
"This'll help," she commented, "Make it a bit easier for you to put it up me."
She finished greasing up Kevin's prick and stood, handing him the tub and getting up onto the bed. Kevin felt even more turned on as his mother got on her hands and knees, her bare arse pointing right at him. Her buttocks were lovely and smooth, her cunt neat and wet looking, and above it, a puckered, hairless little arsehole.
"Put some of that stuff on my bum," she asked over her shoulder.
"Okay," Kevin grinned, and clambered onto the bed behind his mother, scooping up a bit of vasaline with his fingers and delicately placing the tips of his smeared fingers to Julie's anus. He pasted it on, following his mother's casual instruction to 'pop your finger up there', watching the sight of his forefinger slip up easily into his mum's greased arsehole.
Finally, he placed the tub of vaseline onto the bedside table and knelt up behind Julie.
"How do I do it?" he asked, realising how much of a novice he was at this.
"Just place the end of you cock up to my arsehole," instructed Julie, "Then push. Just push it in slowly."
Kevin did so, his mum's anus twitching as his throbbing cock-head touched it. Then, he began to apply pressure, his mum's arsehole resisting a little before slowly opening up, Kevin wide eyed and thrilled as half his cock slid up into the tight hole between his mum's plump buttocks.
Julie let out a long sigh of pleasure. It'd been so long since she'd been fucked, and whilst anal sex had always been enjoyable for her, the 35-year-old felt intense, orgasmic joy flood through her naked body as her own son's prick was pushed into her arsehole.
"Keep going," she panted, and Kevin obeyed, a quick thrust of his hips burying the rest of his dick into his mother's arse.
"This feels great," he gasped in awe, "Really nice."
"Good," responded his mother, "It feels great for me too. Now, just begin to thrust. Just fuck back and forth."
A little shocked to hear his mother use the 'f' word, Kevin did so immediately, placing his hands on his mum's lower back as he pumped his hips, blown away by how fantastic it felt to have his mum's tight sphincter gripping the base of his erect cock, and the feel of her wet, slippery rectum into which his cock-head was delving into.
Julie went down from her hands to her elbows, laying her head on the pillow and closing her eyes. It was pure ecstasy, her own boy buggering her. The clumsy enthusiasm of Kevin's quick little thrusts turned her on even more, knowing that she would be the first woman to have his cum shot up into her body.
Kevin was so turned on that there was no chance for self-control. After a few minutes his orgasm began to rise and he just fucked away up to, and beyond, his climax. His body was wracked with jolts of pleasure, moaning out as his cock pulsed and throbbed in the depths of his mum's rectum, spewing out thick cum.
"Oh God," he cried, "Oh shit I'm cumming!"
Julie moaned out too, back her arse up against the lad's cock, receiving his sperm in her guts. After a dozen squirts, Kevin's orgasm began to fade away, and he popped his prick from out of his mum.
"That felt great," he smiled to his mother as she turned and knelt before him.
"Couldn't agree more," Julie replied, and gave the lad a little peck on the forehead. "It's getting late. Do you want to start getting ready for bed?"
"Sure mum," Kevin said, getting up, "Shall we do this again sometime?"
"Okay. Why not? How about tomorrow after school?"
"Yeah. Cool!"
Julie smiled as her boy left the room.

They continued their little set-up as the weeks went by.
Kevin saw it as just masturbating, but using his mum's sphincter instead of his fist. That enabled him to fully silence the little twinges of guilt he had about what he was up to. In fact, he began to relax, as did his mum. Julie had been considering getting a dildo of sorts before hers and Kevin's antics had begun, so she too felt at ease when she justified their little anal sessions as just masturbation with another person.
Occasionally, she wondered whether it'd be okay to suggest normal intercourse, but on reflection, she wasn't really that bothered anyway. Being fucked in the arse, she realized, was far more enjoyable than in the cunt. Kevin thought the same thing too. Buggering his mum felt fantastic; if cunt-fucking was even better, then he'd have something to look forward to when he got a girlfriend and laid her.
One evening, madly fucking his mum's arse, Kevin asked her if she's mind 'sucking me like you did in the bath that time'. Julie was happy to do so, slurping on the lad's stiff, arse-flavored cock until he gasped and shot his salty fluid down her thirsty gullet.
If anything other than vaginal sex was acceptable, Julie reasoned to her son, perhaps Kevin would like to fuck her tits? She lay back and instructed the randy 13-year-old to kneel astride her belly and slide his prick to and fro in between her breasts, which Julie clamped together, the lad's cock hidden completely in the deep cleavage between those big, juice busoms. Only the throbbing head of his little dick emerged on the upstroke, and it soon sloshed sperm over his mum's neck and face. That, like blow-jobs, was another fun trick they enjoyed regularly, Kevin sometimes slipping his prick from between his mum's tits and sperming up directly onto her pretty, smiling face, or perhaps just gushing cum over the tits themselves, wiping his slimy cock-head over her stiff nipples.
Buggery remained the primary activity though, and neither seemed to get bored of it. Certainly the novelty wore off enough for them to remain in a full, seemingly normal mother-son relationship - they just arse-fucked when they felt horny, which was usually once in the morning before school/work, once as soon as they both got home and then one or two times before bed. They slept in seperate beds during the week, but Kevin liked to sleep with his mum on Friday and Saturday nights so that they could have a long morning session as soon as they awoke.
Kevin once wondered aloud as to how often he could cum in a single day. Julie jokingly told him to find out, and her son took up the challenge. That Sunday, he got up his mum's arse whenever he was faintly aroused, Julie impressed that, in that single day alone, her boy fired nine loads of cum into her bum.

Early one morning, Julie woke up early. She'd slept naked, as she usually did these days, but before going into her son's room she fancied putting on something a to excite him further. Not that there was any real need; the lad was as insatiable as her for their little antics, but nonetheless Julie had decided to see if she had any sexy lingerie around.
In fact, she hadn't bought anything of that description for years, but lurking in the back of her wardrobe, she discovered an old nightdress, a white satin one trimmed with lace. Grinning, she plucked it out.
Kevin had been awake for a few minutes, his morning erection as strong as ever as he lay nude under the covers. His mind was still groggy from sleep when his door opened and in came his mother.
"Morning sweetheart," Julie greeted him.
"Hi mum," Kevin responded. He became more alert immediately after seeing his mother. Julie was pretty much average build - well, maybe an extra pound or two here and there, she reluctantly admitted to herself - but the nightdress she wore had been bought years ago when she was slender an in her twenties. With the little bit extra flesh she had put on in the meantime mostly around her hips, it meant the shiny, white satin material hung loosely around her midsection but was a little stretched over her arse, those lovely, round cheeks beneath showing every contour. The garmant had a wide, plunging neckline that revealed a lot of Julie's impressive, natural cleavage, and what little part of her breasts that were covered were behind thin lace, her nipples easily visible through it. The cut-off of the nightdress was halfway down her thighs, bordered with more frilly white lace.
"You look great mum," Kevin said.
"Thank you sweety," Julie smiled.
"Shame I got school soon."
"No, silly, it's Saturday."
"It is? Shit, yeah. I forgot. Cool."
"Any plans for today?" asked Julie as she swiped open the curtains that overlooked the large, tree-filled garden.
"Might head to the cinema with a few friends," her son informed her, his gaze fixed on her arse before she turned round.
"When will you go?"
"Not for a while. Probably about lunchtime. I'm feeling pretty randy at the moment."
"Me too," Julie replied, and whipped the covers back from her son, Kevin's slender body revealed, his prick, throbbing and hard, laying across his belly. The boy's cock appeared to be a little bigger that it had been a couple of months ago when they'd started their sessions.
"C'mon, up y'get," Julie ordered Kevin, light-heartedly, and the teenager eagerly got up and stood next to the bed, onto which Julie clambered. She got on her hands and knees, briefly reaching round and pulling up the hem of her nightdress to her lower back. His mother's mouth-watering, chubby arse bared and thrust at him obscenely, Kevin felt even more aroused than ever, his cock so erect it almost hurt.
"Climb aboard baby," Julie ordered, lust creeping into her hoarse voice. Neither of them felt the need to hide their randiness.
Kevin got on the bed and knelt behind his mum, seeing that her anus was a little dilated and glistening KY-Jelly.
"I'm all lubed up," his mum said, "No need for delays."
Kevin couldn't agree more, and soon pushed his prick up into his mum's bum, mother and son letting out long, pent-up sighs of ecstasy as Kevin slid in to the hilt.
Gripping his mother's waist, Kevin began slamming his hips, both of them grunting animalistically as they arse-fucked, Julie panting into the pillow whilst Kevin drove his swollen cock-head into the clasping, moist depths of his mum's rectal passage.
His pelvis made a deep clapping noise as it smacked against Julie's spread arse, the randy woman bucking her bum up against her son and urging him on with obscene cries. After a short while, Kevin's orgasm hit him like a thunderclap, and he had to grip Julie's shoulders to keep himself upright as his pelvis jolted spasmodically, his cock geysering forth spunk up his mum's bowels.
When he'd shot his load, Kevin slowed down and breathed deeply with his cock still lodged in his mum's arse.
"Shit," he panted, "I think I'm ready again."
"Yeah?" responded Julie, looking over her shoulder, "You're right, your still hard."
Kevin began moving his hips a little, proud that his cock had only become semi-flaccid and, as he gently buggered his mum's sperm-filled arse-guts, it began to re-stiffen.
"Lay down mum," he said, and Julie did so, slowly lowering herself onto her stomach, Kevin following so that he soon lay flat across the back of his mum, his prick fully hard once more in her bum. Propped up on his elbows and breathing hard into Julie's ear, her began grinding his hips, their hoarse grunts of delight starting up once more. His previous efforts keeping his orgasm in check, Kevin got ready for a long trek towards a second climax. He and his mum were sweaty and exhausted when, half-an-hour later, the teenager finally cried out and spunked up hard inside his mother's arse.
They lay like that for a while, recovering, before Julie asked if her son was hungry.
"Damn right," Kevin chirped, getting up, his cock - finally flaccid - sliding out of his mother's well used anus.
"Fancy a big breakfast?" his mum asked, "Then you can help me buy some groceries."
"Then can I do you in the bum again?"
"Of course honey. C'mon, get dressed. I'll get that breakfast ready."
"Excellent," Kevin responded, climbing off the bed and eagerly dressing, his mother heading into her room to do likewise.