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Keeping cool in the summer months would have been as easy as just heading back inside the house and plopping on the couch to enjoy the air conditioning, if Dylan and Cassandra weren't so invested in their sense of privacy.

The property was large enough that they didn't have to stray far to find some time alone, but there was a shed off the back corner of the lot that no one else ever bothered to go near; it was the perfect place for them to sneak off to when the mood struck, and it did so often enough that Dylan had taken it upon himself to make some minor improvements to the old building.

Splinters in painful places, after all, would be just as difficult to remove as they were embarrassing to explain.

"Thank goodness we can at least get a little cover from the sun in here...I don't think I'd be able to take much more of this if we were in the sunlight."

"Are you really saying that you'd stop me if we decided to take things outside?"

Inner walls clenched with feverish need around a full, throbbing member, silencing the tease from the playful fox beneath Cassandra. "You know damn well that I'm not," she murmured, keeping a lusty gaze cast upon her brother as she worked herself to yet another frenzy in his lap. "Though I think I've found a little...problem with our current situation."

Dylan took a moment to pull free of her womanhood, needing the break to collect himself. The juices on the base of his length collected against Cassandra's backside as he slowly eased back and forth, letting her feel the throb of the underside of his shaft as he worked.

They would both end up messy before too long if they weren't careful, but she didn't mind the slick juices upon her backside: she even rolled into his cock for a brief assjob as they stayed close, contemplating their options.

The summer months were flying by, and since they'd finally crossed a forbidden line together, Dylan and Cassandra were spending most of their days the same way: sometimes it was in the shed, sometimes it was behind the locked door of a bedroom, and sometimes, they went truly bold and brazen with a session right by the pool...but they almost always ended up on top of each other, exploring their vulpine bodies in a way that could land them in terribly hot water, if they were ever caught.

All of the risks involved weren't enough to stop them, and the small pile of filled condoms laying next to their huddled position made it clear that those potential dangers wouldn't even slow them down.

"Is it the fact that you're hungrier for a different kind of creamy treat?" Dylan asked. Cassandra giggled in his face as she perked an ear, the same as her brother did, and picked up on the distant chimes of an ice cream truck rolling through the neighborhood. "Because...I'd rather not stop, but if you're buying..."

"He'll come back around," Cassandra suggested. "Sooner than later, I'm sure. I think it'd be more fun for us to race him and see if we can finish each other off before he leaves."

"Have I ever mentioned that I love how kinky you are, sis?"

Cassandra licked the tip of his nose and smirked at his affectionate words. "Only once or twice," she teased. "But speaking of kinks, and problems...you're all out of condoms, aren't you?"

They would already have been tempting fate by using such a sloppy method in the first place: Cassandra allowed Dylan to penetrate her without a condom the entire way, but right at the moment of blissful completion, she'd hop off, slide a rubber over his tip, and put herself back in his lap, knowing the dulled sensations would buy each of them a couple more minutes of forbidden bliss.

Dylan only brought so many along with him that afternoon, thinking that they'd be too wiped out to keep going much longer...but a quick water break between rounds was all that they needed to rise to the occasion a second and even a third time. This far into the fourth round, they'd only just come to the realization that Dylan was out of condoms, and the pressure of his length pulsing inside of Cassandra's womanhood reminded her that they needed to do something about it, and fast.

"I very well could be," Dylan admitted, as he slowed the pace of his bucking, rolling hips. "Not that I've ever known you to complain about getting a little messy, but it'd probably be hard to explain a load of cum all over your face if we got caught on our way back to the house..."

The vixen was flustered at the idea, but she was grinning all the same, enamored with the idea of being marked by her brother's seed. Her panties would likely take some of the mess, and her shorts might not survive it, either...but clothes could easily be washed, if they pushed too far, too fast.

She was keeping just one tiny detail from him, however, and she wanted to hear how he'd react before she revealed it to him.

"While I'd be more than happy to put my mouth to work and claim my own treat from the 'ice cream man,' I think I've got a solution that'll work just fine for both of us."

Their bodies were addled with sweat, their limbs were starting to tremble, and both foxes knew that they'd only make it a little bit longer before they reached a mutual climax once more.

Dylan actually looked a little panicked as his hips picked up the pace all on their own, wanting to know the unbridled pleasure and excitement of finally cumming inside of Cassandra, rather than filling another condom and tying it off to add to their collection.

"If you've got one, y-you..._nnfff..._m-might wanna start telling me what it is," Dylan panted, biting his lower lip and fighting his way through every word as he pounded up into her inner thighs.

Cassandra met with his increased pace, dropping firmly against his lap and grinning as her juices left his cock as the wettest part of his body, even when the rest of his fur was drenched with a healthy shimmer of sweat.

The soft, powder blue thong around her hips was stained a full shade darker by the efforts of their lovemaking, and only by being stripped away so early on did her tight, tiny shorts of white manage not to be left sheer by the act.

"How about...instead of you pulling out and wasting all of that sweet, tasty cum on my tongue...you just pump it all inside of me, big brother?"

Just hearing that offering was enough to push him over the edge, but he clenched every muscle in his tummy and tried hard to fight back against an overwhelming wave of pleasure.

He knew it was a losing battle, but Dylan still fought back through every second of the buildup, until he felt the first long, thin strand of his cum gushing up into her vaginal passage...and right up into her womb.

"Yes...l-like that..." she praised him through quivering lips, unable to help herself as she collapsed into his lap and held still, wanting to know every deep pulse of his length as it filled her up. Even after three cumshots in a row, her brother still had plenty of volume left to give, and the second, heavy pulse of his rod filled her up to the point that a streak of his ejaculate sprayed across the floor of the shed, soaking right into the floorboards. "Keep f-filling me, Dylan! Make me cum!"

That extra, delightful pressure of his seed pouring into her was a delight that Cassandra had only been able to imagine before; now that she knew the reality of it, she didn't know if she'd ever be able to settle for anything less. Her body gave an immediate show of appreciation as the base of her passage clenched around her brother's cock and held it firmly inside, while eager muscles clenched and milked at his shaft, wanting to make sure he didn't spare a single drop of his mess.

She was so elated that her ecstasy played across her face, but Dylan could hardly believe the wide, playful smile on her lips as she began rocking against his length once more, wanting to feel a little extra motion as she rode out the waves of her climax.

I don't believe it...I just came inside of her and she doesn't seem to care at all, Dylan thought. She's loving every second of it...how come she isn't freaking out like I am?

If not for the sense of overwhelming dread that followed what he thought was a mistaken orgasm, Dylan could only imagine what level of elation he would have reached...leaving him just a little bit jealous of Cassandra, as she melted down into her brother's chest and leaned on his shoulder. For a moment, she was content to simply rest atop his pulsing length, letting her womanhood engulf every last drop that he could offer to her, but sooner or later, she'd have to own up to her little prank.

The afterglow hung around for longer than either of them could have imagined, and as she finally sat up enough to look Dylan in the eyes once more, she could see just how terrified he was at the prospect of what they'd done; her own expression softened accordingly, but she couldn't help a quiet giggle all the same.

"How are you taking this so lightly? I just...I just came _inside_you," Dylan reminded her, wondering if she'd become so dehydrated that she was delusional. "I know we've been taking things a little further every time, but...what if I just knocked you up? What if this takes?"

"Better question: what if I'm on the pill, and I just forgot to tell you?"

It seemed such a logical and common thing that Dylan wondered how he hadn't put those pieces together before, but he wasn't that privy to his sister's more private affairs. Until that summer, it was no business of his what she did with her reproductive health, but just hearing those words, he felt a new warmth over the base of his sack as his seed continued to pour back from her parted folds, dribbling down the tender underside of his shaft.

"That was our fourth round," Cassandra reminded him. "And by the looks of it, just the chance to cum inside me boosted your production that much...you really are a little freak sometimes, aren't you?"

"Tall talk, coming from the girl who let her brother think that he was going to knock her up if they kept going," Dylan countered. "I've never felt anything like that before! How was I supposed to know that it was going to feel so good?"

"You weren't, but now that you do...do you wanna go again?"

A fifth round seemed downright impossible when Dylan was still collecting his breath and his wits, but every time he felt his sister clenching around his tool, the possibility of jumping right into another romp became less of a distant fantasy, and more of an imminent reality.

"You don't wanna clean up first?"

"A little extra lubrication never hurt anything," she claimed. "Besides, now that you know you can finish inside of me, I wanna see how much you've got left to give...you're not the only one getting to experience something for the first time, and if I'm being totally honest, this...t-this feels incredible, Dylan."

Everything they did together was considered taboo by the world they lived in, but that knowledge wasn't enough to slow their rapid plunge into depravity. The fact that they shouldn't have been doing it in the first place was little more than fuel to an already raging fire, and knowing that his seed was the first to ever get a chance at Cassandra's womb left Dylan trembling inside all over again.

He'd be ready to go before long, and her inner muscles wouldn't let him get soft before she was completely satisfied.

"I've never known you to be this wet before," Dylan agreed. "This is...almost too much, if I'm being honest."

"Do you want me to stop, then?"

Dylan's paws moved up from Cassandra's hips and pushed at the hem of her already short t-shirt, giving her a message that he wanted it out of the way for their fifth and final round.

She was happy to oblige, but it took their combined efforts to lift the sweat-riddled garment from her torso, and when it finally snapped free, her modest bosom gave a tiny, cute jiggle before she settled into place against him once more. She could already feel his paws roaming over the strings of her thong and playing with it as she eased back into place, but she was nearly purring at the way he handled her undergarments.

"If that wasn't an obvious enough answer for you, I'd be happy to try a few other methods."

Cassandra giggled. "I think I get the point, Dylan...but by all means, try explaining yourself to me a few more ways! Seems like I enjoy each one a little bit more than the one before it."

As the very last trickles of his cum eased out of Cassandra, Dylan propped himself up against the edge of the workbench once more, giving her just enough time to settle in his lap again before he pressed his face into the slim gap of her cleavage.

Her bodice was warm, so much that it should have been uncomfortable in the middle of the sweltering, summer afternoon...but instead, he found comfort against the moisture of her sweat and that sweet, familiar scent that pleasantly eased from her body, tickling and teasing his nostrils.

He was enamored with his own sister, and even if someone walked in the shed on them in that very moment, he wouldn't have stopped; he might have pumped into her even harder , as his hips began rocking up into her body once more.

"So...letting your brother cum inside of you was the best part of your day, then?" Dylan joked with her, knowing those words would leave a scathing, new arousal in the pits of her loins. "Just wanted to make sure I fully understood your point."

"You know damn well it was," she assured him, as she kicked her legs forward and planted her feet on the floor behind him. Adjusting her pose was all it took for her backside to drop lower into his lap and her womanhood to take the whole of his cock in a single stroke, but as she held onto his shoulders, she found she could buck against his lap with greater depth...and he had no excuse to ignore her breasts any longer, close as they were to his face. "The same as getting to cum inside your sister was the best part of your day."

This time, they really were burning the last fumes of their energy, but they didn't want to leave anything on the table before they decided to take a break. Their bodies were overwhelmed with lust, far past the point of logic...and as sweat flung from their fur and dotted the floor with marks of their efforts, their quivering bodies continued driving into each other.

There wouldn't be any soft, gentle lovemaking in the old shed, that afternoon. They were letting out years of pent up sexual frustration, and each time they thought they'd given everything they had to each other, they found a little more drive in places that they didn't know they had.

"I hope you d-don't mind if I do it again, then," Dylan groaned, feeling the familiar tingle of climax after just a few minutes of Cassandra's new posture.

She leaned in and stole a quick, but ferocious kiss from his lips, moving past the stage of being playful with her brother. "You'd fucking better ," she demanded of him, just before her fangs nipped at his lower lip and gave it a subtle tug.

Whether it was summer heat or genuine estrus, the pair were going at each other with every ounce of effort they had left. Cassandra's thighs were trembling with the effort of her dropping hips, just as Dylan felt his backside cramping from pumping up into her wet, needy cunt so vigorously...but they ignored every signal their bodies gave them, save for one.

The pleasant, growing tingle of ecstasy was the only thing either one of them could listen to, and they chased it as far as their endurance would allow them to as precum flooded into Cassandra's passage.

She hardly noticed the slick, tiny tease after what had happened before, but there was just enough of it to trigger her memory of the first, heated burst of cum that her insides had ever known...and at that, they began to clench all over again, letting Dylan feel the blissful contractions of a deep, vaginal release.

His teasing grin and even his lusty bravado were stolen away from him as Cassandra bore down on his body and held his cock inside so tightly that he struggled to move against her...but it was impossible for him to resist that kind of pleasurable pressure.

He was already on the verge of cloud nine when he finally made it through her resistance, but he'd fallen right into her trap as the whole of his shaft disappeared inside of her welcoming passage.

It was immediately met with the uneven, fluttering squeeze of her orgasm, and once more, his inner muscles gave in, his resistance crumbled, and a jet of his seed burst from the tip of his cock, spilling the genuinely final drops of his mess inside of her already stuffed womb.

"I f-feel that," she assured him, giggling at his ear and nibbling at the base of it as she stayed in close, bouncing just the littlest bit that she could without losing the delicious fullness of his cock inside of her. "I can...feel all of it, Dylan! Yes! It's m-making me cum, big brother! Yes!"

They had to at least try to keep their voices down in the shed, but even the tools were rattling with the sound of their bliss as Dylan lost his cool, along with her. "So wet...s-so tight...how do you even do that, Cassie? It's t-too fucking much! Mnnnf!"

A gushing mess poured up into her womb for only the second time, but the act carried even more bliss this time through: she was practically drooling on her brother, and she felt him literally doing the same as he bit down on her shoulder, needing to muffle the sound of his delights, even just a little bit.

The proper, low rumblings of a drained, vulpine male moved through her shoulder, letting pleasant vibrations reach her ear and turn her into a puddle against him...just above the one that was leaking back out of her stretched, well-used folds and gathering on the floor between them.

"We...w-we're gonna have to clean that up," she mentioned, as she slumped into his arms, soaked from head to toe with the fruit of their efforts.

Dylan nodded, but his ear perked to the familiar jingle of the ice cream truck coming through their neighborhood once more. "All in due time," he agreed, before kissing her cheek with grinning lips. "But first...I think we've definitely earned a cool down."