Summer Inside His Sister Pt. 02

But there was one more, the most important one of all... She didn't admit it to herself until later, but that didn't prevent her from granting her kids' the sexual freedom they desired.

"Give it to me, bro!... Fuck me! Fuck me with your huge cock!... Ooh, oooh, ooooh!... Yes! Ooh, oooh, ooooh, oooooh, ooooooooooooooooooh!..."

And boy, were they taking advantage of it! Before dinner, *during* dinner, after dinner, at least once more later in the evening, and of course they slept together, too. Judging by the sounds coming from Ethan's bedroom, today they picked up exactly where they left off last night. Linda was sure they'd be fucking when she leaves for work, and she suspected they would be going at it when she comes back home, too. There was just no stopping them; her teenagers were simply insatiable!

And Linda just couldn't tolerate it anymore.

Which is to say, she couldn't tolerate being left out!

It started with Ethan's dick, of course. Linda noticed it immediately, even before she learned of their incestuous activities. She had touched herself in her home office, thinking how it would feel to get pounded by such awesome specimen. Her husband, that cheating bastard, was no slouch in the cock department, but he had nothing on his own son. Ethan had to be over 10 inches long! And he had balls to match, too. No wonder the boy had to masturbate so often: they must be filled to the brim with hot, teenage cum!

But it hasn't been only about her son. Though Linda wasn't particularly into girls, save for a few encounters in college, she now found herself strangely attracted to her tall, athletic daughter. She had that carefree, effortlessly sexy attitude about her, and she simply radiated youthful vigor. To her own shock, she found herself wondering what her pussy would taste, especially when filled with her brother's warm seed...

Indeed, that was the hottest thing: the two of them actually fucking. She got a glimpse of it when they started having sex at the dinner table, and it got her so horny that she had to leave in a hurry. Even before that, she couldn't help but to egg them on, and she was thankful Katie somehow interpreted her allusions as just Mom being mom. For all her sexual experience, her daughter could be so naive sometimes...

"Oh my god, Ethan... You are so deep! Fuck! Your cock... I fucking love it!.... Aaaaah!"

Mmm, yes, Ethan's cock... When Linda left them after dinner, she went to her bedroom to spend some quality time with her trusty 8" dildo. Pushing it into her sopping wet snatch, she imagined it was her son's much bigger cock ravaging her mature pussy.

But she wondered: would Ethan even want to fuck her?... At 5'6", she was shorter than Katie, and she had nowhere near the fitness model body of her daughter. However, Linda more than made up for it with her generous curves, including large boobs and enticingly flaring hips. Her Asian heritage showed in her cute face, still looking the same at almost 40 years old as it did when she was only 20. Overall, Linda was a sexy, voluptuous woman. Surely a young buck like Ethan wouldn't pass on the opportunity to sample her feminine charms?...

Well, she wasn't sure, but she could at least stay optimistic. Like almost all teenagers, Ethan thought with his dick; he admitted as much, saying that Katie was simply too hot to ignore. If Linda could steer his lustful attention towards her, then perhaps she would get to feel her son's thick shaft stretching her pussy, too.

...Not that she wanted to drag him away from Katie. No, not at all! See, Linda wanted to have sex with *both* her children. After a failed marriage, and years of shoddy dating life that followed, her curvaceous body was desperately yearning for attention. Her own kids has just showed her how crazy and passionate sex can be, and it was all she could think about anymore!

"Keep fucking me, Ethan! I need your cock in me... Fuck me, bro! Then fuck me again... and again... and again... Oh yeeees!"

Thankfully, Linda had the foresight to set the alarm clock half an hour early. Her quivering pussy definitely needed another workout.

***

Ethan put down the dumbbells and wiped the sweat from his brow. He knew better than to push himself too much, especially the first few times, but he really hoped the results would come quickly. He urgently needed to get in shape, both in strength and endurance, or else he'd never be able to keep up with his super-fit sister. And he really, really wanted to...

Breathing hard, he hopped on the treadmill and set it to a light jog. It was liberating to exercise in the nude, even though his semi-hard dick would often flop around as he ran. At least that body part of his, the most important one, appeared to be in excellent shape. It never failed him during the yesterday's sex marathon with Katie, and then he was up and ready to continue fucking her in the morning, too!

Ethan thought, jokingly, that it was all those years he spent jerking off that prepared him for the never-ending trysts with his sister. The true reasons, of course, had more to do with Katie herself. She was incredibly hot; totally shameless; hornier than maybe even he was; and sexually demanding in just the right way that made Ethan rise to the occasion, time and time again.

For the last 24 hours, the two had been inseparable, rutting like wild animals and rocking the house with Katie's endless cries and moans. This was really the first time they gave each other some space, and put their nonstop fuckfest on a short, very much temporary hold. Ethan used the break to go to the basement gym, like he had planned, while his sister finally got to do something about those pesky tan lines.

But even as he trained, sex was constantly on Ethan's mind. He kept thinking back to their lurid sessions, including possibly the craziest one of them all: when they started fucking right at the dinner table, in full view of their mother! He still couldn't believe Katie has convinced Mom that this would be just fine -- that she should simply let them walk around naked and fuck wherever they pleased.

What mother would allow that? Only the coolest one, that's for sure! His mom was truly the best mom in the world, he thought. He pictured her standing between him and his naked sister, biting her lip as she tried to make sense of it all.

It was really cute.

His mom's face was cute, and very pretty.

Actually, the more he thought about it, the more he had to admit that Mom was just a very pretty woman.

Was 'pretty' even the right word, though?... No, Ethan realized. He only used it to conceal -- from himself no less! -- what he really thought about his mom.

She wasn't just pretty: she was hot! Those enticing curves, seductively accentuated by her body-hugging sweater and tight jeans... She wasn't dressed to impress, as she had just come back from work, but Ethan's subconscious had definitely picked up on her undeniable sex appeal. It was only because he'd been distracted by Katie fucking his brains out that he didn't realize it much sooner.

Ethan's mother was a MILF, and the "I" in there? That was him!

He slowed down the treadmill to a stroll, his cock rock-hard from the obscene fantasies he was now indulging in.

Mom was naked and on all fours, moaning his name as he drove his rigid meat into the steamy hot depths of her mature vagina. The same hole Ethan had come out from, he would now pound as hard as he could, hips bouncing against the soft butt cheeks of his voluptuous mother as he railed her with his massive cock. Her large, pendulous breasts would sway from the force of his long thrusts, and she would cry and groan as she creamed herself repeatedly upon her son's huge shaft. In his fantasy, Ethan would have no problem fucking his mom for hours, giving her more orgasms than she thought any woman could ever experience!

"Fuck, I need to cum," he said out loud, looking at his throbbing erection. It was tempting to just rub one out right there, but he knew a girl who would definitely appreciate if he brought her a big hard-on. His cock-hound of a sister was currently sunning her nude body in the backyard, so that's exactly where Ethan went next, right after a quick shower.

Sure enough, she was lying on a chaise lounge by the pool, eyes closed as she enjoyed the late morning sun. Quietly, her brother crept behind her and waved his swollen cock right above her lightly smiling face. The turgid shaft and the engorged balls cast a long shadow over Katie's neck and chest, and she opened her eyes to check why the sun was suddenly all gone. She saw there were no clouds in sight, but the sky was still darkened -- by her brother's enormous dick.

"Bro, I'm trying to get a tan here!" she scolded him jokingly, the smile now turned into a big grin. "Back from the gym already? I can see there's at least one muscle you have really pumped..."

"Yeah," he said simply. "I got horny."

"Been thinking of me, stud?" she purred sultrily, her hands reaching up to stroke his achingly rigid cock. "Wow, it really got you worked up, huh? Well, tell me what it was, brother! We can make that hot fantasy of yours come true..."

"Uhm... that might be difficult," he said cautiously. "I was actually thinking about Mom."

"Yeah, I still can't believe we are getting away --" she started, then suddenly stopped rubbing his cock when she realized what her brother actually meant. "Whoa! You really have been *thinking* about Mom! And it got you hard!" Katie said, letting out a lighthearted chuckle. "Damn, bro! That's fucked up," she added, then simply resumed stroking his large erection.

Ethan was dumbfounded. "You-you're not mad?"

"At you? When I have my hands on your huge cock, and I'm pretty sure it won't be long before it's going inside my wet pussy? Yeah, I don't think I could get angry with you right now," Katie said with a laugh, then continued in a sultry tone. "But maybe I should?... If you were fucking Mom, would you still have time for your horny big sister?"

"Always," he said, ogling her naked, glistening body. "Forget about Mom! Let's go back to bed, sis."

She giggled. "Do I have to remind you again, brother? Anywhere we want," she said huskily, turning around and getting on her hands and knees. "My pussy is always wet and ready..."

Ethan didn't need to be told twice. He moved behind his sister and lined up his stiff rod against her vaginal opening. Much more confident than he was just the day before, he pushed his rock-hard cock deep into his sister's dripping snatch.

He didn't know it, but Katie had been fingering herself as she lay out there in the sun. staying wet and horny for whenever her brother would come back to ravish her. She didn't really need much in the first place, as Katie was practically always ready for sex now, but she'd tease her clit all the same, driving her insatiable libido to whole new levels.

"Oh fuuuuuck! I missed your cock so much!... Fuck me, Ethan! Fuck your slut of a sister! Make her come on your huge prick!"

Ethan gasped. Until now, he hasn't heard Katie say that she was a slut, not even in the deepest throes of their shared passion. It surprised him just how hot it was, and he started fucking her harder.

"Are you... a slut... sis?" he asked, in between his deep thrusts.

"Oh yeeeees... I'm such a slut... that my own brother... fucks me... whenever he wants!"

"And you like it," he said, finding the confidence he didn't think he had.

"I love it!... Oh god... I never want him... to stop fucking me!"

His pride soaring, he added on a whim, "What about Mom?"

"He... he can fuck her too! Oh yes... That'd be soooooooo hot!"

Katie was almost out of her mind with lust -- almost. What she was moaning out, as her brother pounded her slutty pussy, was exaggerated to be sure, but also more or less true.

When Ethan told her that he was hot for Mom, it wasn't the first time Katie thought about their mother in a sexual context. She definitely wasn't truly bisexual, but Katie found herself attracted to women on a number of occasions, particularly in college, but also back in high school. Her nearly boundless sex drive, and a very casual attitude, led to more than instance where her current boyfriend would sweet-talk her into a threesome. She always enjoyed making out with another girl, even if it was mainly for the guy's benefit, and would typically find herself fooling around with the female extra long after her boyfriend was spent, and snoring.

On her own, however, Katie didn't usually go for women. The thought of her mom getting involved in their incestuous activities hasn't really entered her mind, not until Ethan mentioned it. Sure, Mom had already "involved" herself, when she normalized their son and daughter having sex all over the house, but that only made her a passive bystander. Could they get her to actively participate, too? Katie wasn't sure. It was too complex to ponder right now, with her brother's cunt-splitter making her shudder with every slide into her slick pussy!

"Hah!... You really are... a slut," Ethan groaned, a fresh load of cum boiling in his bloated nuts. "Maybe you would even... fool around with Mom yourself?"

"Fuck yes!... I'd eat my brother's cum.... out of her pussy... in a heartbeat!"

This was getting too much for Ethan, who had been a virgin only a little over 24 hours ago. With a final, strained groan, he spurted what felt like ounces of his hot jizz deep inside his sister's clenching pussy. It set off Katie to her own powerful orgasm, and she cried out in ecstatic pleasure as her brother blasted his seed into her, one wave after another.

She eventually just collapsed on the lounge chair, overwhelmed by the intensity of her climax. The last few shots of Ethan's cum landed on her lower back and ass. She lay like that for a few moments, savoring the afterglow, until she felt something warm and thick rest in the valley between her taut ass cheeks.

"Don't mind me, sis," said Ethan. "I'll just use your ass crack like this... It doesn't count as jacking off, right?"

Katie snorted a laugh. "Be my guest, bro! And it does feel pretty nice, actually," she said, twisting her head to watch her brother slide his big, still hard cock along the cleft of her shapely derriere.

She winked at him, rather impressed by his rapidly growing boldness. Her seduction of Ethan, unplanned as it was, has already paid off massively -- not only in countless orgasms, but also in the pleasant comfort of always having access to her brother's hard cock. It was exactly what Katie's horny pussy needed, and a great start to a summer filled with sex.

Now she just had to figure out how to get Mom to join in.

***

All throughout the day, Linda has been feeling very sexy.

The outfit she had picked has definitely contributed to it, as she was clearly pushing the limits of her company's generally permissive dress code. A white, semi-transparent blouse with a prominent cleavage, and a pair of tight yoga pants that highlighted her large butt -- those were very much on the edge of what could still pass as "professional", even in the laid-back software house where she worked.

If the guys there weren't so intimidated by some bitter and sad bitches who would report anything off-color to the HR, Linda would likely have enjoyed plenty of suggestive compliments. In this day and age, however, she had to be content with perhaps catching some furtive glances, all promptly averted before she even had a chance to smile.

Not a huge loss, she thought; these weren't the men she wanted to impress with her flattering getup. Rather, it was about one particular man: her son. It was one part of Linda's plan to get the young stud to notice his sexy mother, the other being a much more revealing set of clothes that she would now be wearing at home. What she wanted was to capture Ethan's attention from the moment she walked into the house -- a tall order, really, considering what he'd likely be doing at the time...

"Hnnng!... Hnnng!... Ooooooh!... Yes!... Right... there..."

Yup, she was right: they were, in fact, still going at it like bunnies! This time, they even picked not only a spot outside of their bedrooms, but also a rather lewd position. Linda saw that her son was kneeling on the floor, right here in the living room, in front of a couch that her daughter was "sitting" on. In reality, her perky butt was hanging beyond the edge of the cushion, and she was holding on to the back of the couch for purchase, all while her sleek muscular legs were swung over Ethan's shoulders.

Elaborate though it was, this position opened up Katie's pussy and allowed her brother to fuck it freely, with nothing to stand in the way of his huge cock. Needless to say, Linda's daughter was shrieking like a banshee, cumming repeatedly as her brother pounded her without mercy. They were both dripping with sweat; they must've been fucking like this for quite a while now.

And Linda couldn't help but stare. She leaned across the kitchen counter and just... watched. She didn't even feel like touching herself, though her pussy was obviously dripping. Instead, she simply admired the lurid spectacle -- this beautiful display of pure, carnal passion. For the next ten minutes, Linda was totally mesmerized, until the loud roar of her son's powerful orgasm brought this erotic masterpiece to a close.

"Ahem," she cleared her throat, pretending that she came in just now. "Kids, it's me. Try not to make a mess when you stand up."

Katie looked at her groggily, still experiencing the aftershocks of her nearly continuous climax. "Moooom... Ethan is fucking me sooooo good!" she said rapturously, a smile of pure bliss painted on her tired face.

"Glad to hear it, sweetie," Linda replied, feeling naughty to carry on such a conversation. "Have you been doing this all day?"

"More or less," Katie said dreamily. "Ethan worked out for a bit, then we had some quick lunch, but other than that... Yeah, Mom, all day..."

Life's not fair, Linda thought. While she had to deal with a botched database migration, her children literally fucked the day away! She had to be patient, she told herself. Just a few days, or maybe a week or two, and they'll realize that Mom is just as much a sexual creature as they are. And when that finally happens... oh my!

"You must be starving," she said, out of genuine care. "Get your butts in the shower while Mom makes you something to eat!"

"Thanks, Mom," Ethan said, helping his sister stand up. "You really are the best!"

The siblings waved back to their mother, then quickly made their way to the bathroom. They were in a hurry to take that shower, although washing was of secondary importance. Even though they have been screwing on the couch for the past hour, not to mention other places throughout the day, Ethan was inside his sister as soon as the water was running. Their sexual appetites remained robust, whetted rather than dulled by their constant rutting, and that was all the better for pulling off their new scheme.

"Oh, Ethan... Not that I'm complaining... but shouldn't we wait until Mom's around again?"

"I want you now, sis," said Katie's brother, pushing her against the shower wall while he thrust into her from behind. "Don't worry, we'll do it again in front of her later."

Their plan was precisely that: to flaunt their incessant mating around Mom, as often and as obnoxiously as they thought they could get away with. It was their hope that she would get horny, watching her children fuck, and...

Well, that point of the plan was essentially three question marks, but the intended "profit!" part was to have her strip naked and join the sexy fun times. Katie came up with this, and even she thought that it was rather far-fetched, but hey, why shouldn't they at least try? At "worst", they'd have even more, and even naughtier sex!