Summer Inside His Sister

Katie shifted in her chair, leaning over the laptop and letting out a quiet sigh. She was making an effort to focus on the lecture on her screen, delivered in a sleep-inducing voice by a balding professor. She managed to take a lot of useful notes, so it wasn't entirely futile, but there was no hiding it that her mind was mostly elsewhere.

"Fuck," she cursed, groaning in frustration. "I can't stop thinking about... oh!... about him, and about... oooh!..."

A long moan escaped her lips, which her breathy words folded into, as the shapely blonde added another finger to the soppy handiwork between her legs. She spread her tanned thighs a bit more, to give herself better access. She felt a pleasant shiver when the chilly air touched several new, freshly exposed spots inside and outside her sizzling hot pussy.

It aroused her nipples, too; not that they required much. The wanton girl allowed her other hand travel to one of the engorged nubs, squeezing it gently to elicit one more, lusty moan. She continued churning the gooey mess in her soaking wet hole, all the while trying to concentrate on the droning voice in her noise-canceling earbuds.

"O-okay, that's... a bit better," she breathed, now pinching the other hard nipple. "Maybe I just need... to touch myself... more..."

It wouldn't be too difficult -- indeed, Katie was able to touch every intimate spot on her nubile body. She was completely naked right now, which was in fact the normal state for the beautiful, nineteen-year-old girl. Neither she nor her family ever wore clothes anymore, save for her mom's occasional trips to the grocery store. Especially Katie and her brother Ethan, who became permanent nudists in order to aid the sexual education of the inexperienced, eighteen-year-old boy.

Or rather, the *formerly* inexperienced boy. Thanks to his older sister, Ethan had been quickly catching up on the matter, and in a very practical way. The siblings started having sex at the break of summer; since then, they hardly ever stopped. They walked around the house naked and fucked anywhere the urge struck them, often within earshot or in the full view of their mother!

And their mom actually *agreed* to this, tolerating and even condoning her kids having sex so openly. She considered it their journey of sexual exploration and discovery, which the cool mom wanted to be fully supportive of.

Needless to say, it had been a very memorable summer. But after living in this blissful sexual nirvana, the return to her usual college classes, even if she was now taking them remotely, was a tough ordeal for Katie. Her completely out-of-control libido, developed over the months of fucking her increasingly sexually adept brother, had a hard time coping with even just a couple of hours of academically motivated abstinence.

"Finally!" she let out, as the professor's monotonous voice announced the end of the lecture. "Last one for the day, and of course it had to be the most boring one!"

Sighing, she took the pruned hand out of her needy pussy and wiped the dredged-up juices over her flat, lightly muscled stomach. She closed the laptop and removed the earbuds, then lifted her bubbly butt and grabbed the wet towel she'd been sitting on. It was thoroughly soaked, mostly with her vaginal secretions, so she made a face and threw it straight in the hamper. For a moment she thought she'd heard a sound outside, but after several hours of listening to the droll voices in her ears Katie wasn't sure if it was real or not.

Once she opened the door to the hallway, though, she realized that the sound *was* real, and it was exactly what she'd thought it was. Now that she was hearing the full, orchestral version, it was extremely evident why Katie's earbuds had to be noise-canceling.

"Ooooh! Ooooh! Oooh!... Oh my god... Ethan, son... Yes! Fuck me! Fuck your mother, Ethan! Fuck her slutty pussy with your huge, hard, incredible cock!"

Yup, that was Katie's mom and brother. Judging by the pitch, intensity, and direction, it sounded like they were fucking somewhere downstairs, likely in the living room, and that they'd been going at it for a while now. The cadence of Mom's whimpers indicated that Ethan was probably thrusting into her with deep, full-length strokes of his unbelievable 10" shaft. He was shoving it in quickly, his sister thought, but taking his sweet time on the way out to tease and rub against his mother's sleek vaginal glove.

Katie could read all this from her mom's ecstatic cries, because this wasn't the first time by far that their mother was having sex with her kids. Living with the dynamite blonde daughter and her surprisingly capable brother -- both of whom had been doing nothing but fucking like bunnies, all over the house -- it took less than a week for their mom to discard all her inhibitions about incest. Then, after clearing up one little misunderstanding, their mother had finally joined the siblings in their sexual 'experiment', as she'd call it, and the three of them had been fucking ever since.

Yes, it had been a *very* memorable summer indeed.

Following the lurid noises, Katie descended the stairs and peeked into the living room. A raunchy smirk instantly crept upon her face, as she spied the ongoing debauchery that was taking place only a few feet ahead.

"Yeees, Ethan, fuck me! Yes, yes, don't stop... Don't stop, sweetie! Yes, I'm so close... I'm so... Oh my god, I'm gonna.... AAAAAAAAH!"

It was clear that Ethan had just brought his mom to another screaming orgasm. The delirious cry was wrought from her lungs by the savage thrusts of his massive cock, then prolonged into a wailing aria by those same ceaseless efforts of the strong, virile young man. The sight of their coupling was pornographically erotic; as she took it in fully, Katie couldn't help but gasp.

Their mother, Linda, was splayed obscenely on a large ottoman in the middle of the room. Head hanging beyond the edge, her large pendulous breasts swayed and flopped from the force of her son's strokes. She was getting absolutely railed by the fit teenage stud, who had put her meaty legs on his shoulders and was relentlessly thrusting his huge meatpole into the piping hot furnace between them. Thick thighs were bouncing him off, assisting his expert hip work, as he was fucking the curvaceous woman throughout her ongoing, thunderous climax.

"Shit," Katie cursed under her breath. "So, this is what I'm missing out on now..."

Linda's howls of pleasure went on for a good while. Sometimes, they'd take the form of some primal pseudo-words, which she'd shriek out frantically atop one of the many crests of her body-shaking orgasm. Those crude, practically animalistic noises soon abated, however, as they were replaced by the regular chant of broken yelps and moans that punctuated their continuing mating.

But shortly after his mom calmed down, Ethan also slowed down and eventually came to a halt. He decided to change things up for the next bout of their lurid tryst.

"Flip over, Mom!" he growled. "I wanna pound that tight pussy of yours from behind!"

Helped massively in this task by her son, the half-delirious Linda assumed a stance on all fours, with the large ottoman supporting the weight of her tiring body. The fleshy hemispheres of her expansive ass were right in front of Ethan now, and so he plunged his juice-slicked shaft back into his mother's gaping wet hole.

Then, he simply started fucking her all over again.

"Okay, that's it," Katie decided, straightening up as she sauntered into the room with a sultry smile on her face. "Good afternoon, my dear brother. Having fun?"

"Hey, Katie," he greeted her with a grin, the pace of his thrusts unchanging. "You're all done? With your classes and stuff?"

She sighed, as she padded across the room. "Yes, for today," she said. "Bad news is, I'll have to do pretty much the same thing tomorrow."

A chuckle escaped her brother's throat, momentarily throwing him off-balance. He decided to slow down a little bit after that, but even then he was far from stopping his avaricious plunder of Mom's dripping wet snatch.

"I guess it is a bit funny," Katie said. She was staring at the lewd action, with both a frown and a lusty smile on her practically drooling mouth. "Funny for you, that is. You've got like what, half the number of classes that I do?"

"Ugh, yeah, something like that," Ethan admitted.

"So, you just wrapped it up and then ran to stick your hard cock inside Mom, huh?"

He gasped. "Sis, you're making me think you're jealous..."

"Of Mom? No," she denied immediately, smirk turning into a wider grin. "Of you *fucking* Mom? Instead of me? Right now?... Hell yes! Bro, I've been dreaming about your thick, hard, giant dick for hours!"

He let out another chuckle, as he looked at his sister's exposed and absolutely drenched pussy that was just about at his eye level. It distracted him, obviously, though it didn't disrupt his steady thrusts that rebounded, again and again, from Mom's bountiful asscheeks.

So far, he'd been keeping a measured pace inside his mother's steamy orifice. But his sister's simple praise of his extraordinary manhood, and the sight of her practically squirming slit that yearned desperately for his cock, had him on the verge of cumming within seconds.

"I'd love to switch... and I think Mom... wouldn't mind," he said between breaths, glancing down at the mature woman. He was right. Other than letting out constant moans, she seemed thoroughly pacified by her son's cock and the many orgasms it had already given her this session. "But I'm, uh, getting kinda close here... so maybe..."

"Oh, that's fine," Katie said, as she approached the other end of their mother's shaking, undulating body. "I think I can get her to help me with this..."

Ethan raised an eyebrow in curiosity, watching his nubile sister kneel on the soft carpet. She then scooted forward and brought her needy snatch in the vicinity her mom's drooping head. She cradled Mom's head in her hands, lifting it gently to have her look at her daughter's kind, loving, albeit mischievously grinning face.

"Mom," Katie pleaded sweetly, "I *really* need you to lick my pussy. Can you do that?"

"Y-yes," was her mom's weak answer, but it was all that the horny girl needed. She scooted even closer, all but shoving her juice-leaking cunt in Mom's face, and winking at her brother who knelt on the other side of Mom's prone body.

Before long, the slapping and shlicking sounds of Ethan's vigorous rutting were joined by another source of lustful, feminine moans. This time, though, it was his nympho sister who was gasping and moaning in pleasure, struggling to keep her body upright while her mother attacked her overheated and under-stimulated pussy. That poor, neglected slit was receiving the thorough licking it deserved, getting the girl off several times in preparation of getting totally reamed by her brother's immense cock.

"Oooooh, yes, that's it, Mom!... Lick me... right there!... Oh fuck, fuck... Fuck, I'm coming, Mom! Oh my god... Oh my... OOOOOOOOH!"

She was struggling to stay on her knees, so her mom tried and helped. She swung her arms around her daughter's firm, perky butt, squeezing the taut globes and bringing Katie's crotch even closer to her mom's hungry mouth. The distance was further closed by Ethan, who kept thrusting into their mother with the same youthful vigor, literally fucking her face into his sister's throbbing snatch!

But it wasn't going to be for long. The boy's bloated nuts were arriving at their boiling point, as the pressure rose greatly at the hilt of his straining cock. He didn't resist it. He'd been fucking Mom for over half an hour now, taking her through a gauntlet of full-body orgasms, so the teenage stud more than deserved to unload the voluminous content of his massive testicles.

"Ugh, fuck," he let out, "this is it! I'M COMING, MOM!"

He yanked his exploding cannon out of his mother's thoroughly plowed pussy and aimed it at her luscious body. Jet after jet of his virile cream coated the large, fleshy pillows of her derriere, before more of the potent boy's cum landed on her arched back and even stuck to the long tresses of her hair.

"Oooh, yes, son!" his mother croaked, struggling to stay conscious as her arms fell from her daughter's shapely ass. "Cover me... in your cum! Ahh..."

Grunting and groaning in pleasure, Ethan did just that. He then directed the last few spurts straight ahead, where his sister was shuddering from the aftershocks of her numerous oral climaxes. The force of his final volleys was still strong enough to hit her, landing on her round breasts and the flat tummy. The rest ended up on Mom's upper back and neck, which her playful and slutty daughter immediately scooped up and shoved into her hungry mouth.

"Oooh, thanks, bro!" Katie purred. "Is this an appetizer?"

"Yeah," he panted, grinning at the sultry blonde. "And you got more on your tits, too!"

"Mmm, I think I'm gonna keep it there for now," she said, savoring the taste of her brother's thick cum. "There's gonna be more there soon, because obviously you're going to fuck me and *glaze me* next, right?"

Katie put her hands on her hips, indicating she absolutely wouldn't accept no for an answer. In her opinion, that was only fair. Mom already had a few hours of sexy fun time with Ethan, so Katie obviously had to be next. Her studly brother was simply going to have to cope with the demand, bringing his huge dick to bear where it mattered and where it was truly needed.

...Not that he'd ever lodge any complaints about this, of course. Fucking his insatiable sister, or fucking his nympho mother -- or indeed, fucking them both together -- were precisely the kind of activities that Ethan was *very* well versed in.

"Sure thing, sis," he said, grinning, as he gripped his barely softened cock. "Lay down and spread your legs, uh, *somewhere*, and you'll get every inch of my dick, you slut!"

After all, this whole summer he'd been doing little else.

***

"So, uh, I think you've been talking about it earlier but I was... well, a little *preoccupied*," said Linda, sheepishly, talking to her children who sat across the dinner table. "I wanted to ask: how was your first day back in school? After such a long time, it must've been quite an adjustment..."

The siblings were in their usual position, with Katie grinding on her brother's lap. She had his hard cock buried in her softly quivering pussy, feeling its rigid tumescence as it pried apart her glistening lips. There was a look of serene contentment on her face, which unfortunately didn't exactly match what the naked girl had to say.

"It's... oh!... it's been really difficult, Mom," she replied, letting out a gasp as Ethan slowly thrust into her. "I think we are just so used to fucking all the time, it feels weird that we are now... ah!... that we're not supposed to do that anymore. It's a pretty big change..."

Her mom nodded. "I know, sweetie. You and Ethan were practically inseparable, and now you have to stay apart for several hours each day. It must be very tough on you, which is why I've been wondering... Have you considered that you could maybe go through both of your schedules, in detail, to try and find some small gaps where you could sneak in at least a short quickie?"

With her ample boobs shamelessly groped by her younger brother, Katie let out a protracted moan. "Ooooh!... I don't know, Mom," she panted." We, uh, we don't really do 'short', like, at all. Ever since Ethan and I started fucking, it's always been hours and hours of sex, every time... Once we get going, it's pretty much impossible for us to stop, so most of the time we'd just try to tone it down a little, like... ooh!... like now..."

A soft sigh escaped Linda's lips, for she was well aware of her kids' insatiable appetites. Her own rampant libido wasn't all that far behind either -- she was simply more used to controlling it. It was Linda who had maintained a semblance of sanity during their wild summer of unrestrained love, after Katie and Ethan had instigated and then fully succumbed to an all-consuming, lustful madness.

Because, let's be clear: madness was the only accurate way to describe it.

For many long weeks of summer -- indeed, until as recently as *yesterday* -- the siblings had sex practically around the clock. There had been many periods, of several days or more, when they seemed to do little more than eat, sleep, and fuck. The only thing that somewhat moderated this carnal frenzy, other than mere hunger or thirst, was the fact that Ethan liked to work out in the home gym. This one short hour was about the longest break that the sex-crazed couple could stand, for otherwise they were rutting more or less constantly.

"Right, I suppose I should've known, huh?" their mother said, teasingly. "Whenever I see my kids fucking at the dinner table, I should appreciate how much they are *toning it down* for me..."

Both of them snorted a laugh. "Yes, precisely!" the girl said with a cheeky grin. "I mean, it would be really hard to keep a fork steady if Ethan was actually railing my pussy right now, so it's not like we are doing it just to be polite." Her brother chuckled. "But anyway, more seriously -- it wouldn't work for us, Mom, to have those short fucks during the day. We can barely let go of each other already, so having to split not once but multiple times a day would be, ugh..."

"Difficult," Linda finished for her, and sighed. "Yes, I get it. It would be silly to expect that we'd get back to -- well, definitely not *normal*, but somewhat more manageable -- overnight, but I don't think we have much choice... Unless, of course, you have some other ideas how to make this transition a little easier?"

The siblings looked at each other, eyes clouded with a fog of ambient lust. Their nonverbal communication, honed over days and weeks of nearly constant sex, was close to perfect now. They could understand each other practically without words, especially when Ethan's huge cock was sheathed inside Katie's tight pussy,

Unfortunately, all they got from this melding of minds was that no obvious answer had come to either of them.

"Maybe we should first, uh, try to figure out what it is that we want?" Ethan then suggested, as his first contribution to the whole conversation. "We might have a better idea what to do then..."

"Oh, that's easy," Katie said, looking straight at their sexy mother. "I want to fuck you, Mom, and of course Ethan!"

"And I want to fuck Katie and Mom," Ethan added.

Their mom raised an eyebrow and smirked. "And I want my children to one day become productive members of the society," she said pointedly, but she also couldn't resist giving an amused chuckle. "Well, that, and of course for the three of us to keep fucking each other silly!"

Katie threw her hands up and cheered, allowing her brother to really maul her round, shapely boobs. She jumped and rocked on his lap, and soon the two of them lost track of the conversation as they began to focus more on their ongoing coupling. His sister gyrated on top of his throbbing dick, squeezing it with her sleek pussy muscles, while Ethan's fingers were busy rubbing and pinching her pencil-hard nipples.

"Hmm, yes, I guess that *does* help," Linda admitted, watching her nude, lewdly groped daughter as she writhed on her brother's lap. "At least we know where we stand, huh?"

"Ooooh, yes," she moaned, not really trying to reply to her mother. "What... what do you mean, Mom?"

"Let's face it, sweetie: we have become a family of completely unabashed, incurable sex maniacs," Linda declared, a narrow smirk on her face betraying that there was more pride than regret in this statement. "This is just a fact, and we've got to stop pretending that it isn't. I believe our journey of sexual exploration and discovery is therefore moving into a brand new territory. It is one where we take our little holiday adventure and turn it into a whole new lifestyle. In other words, forget about fucking all summer -- we need to figure out how we can do it all year long!"