FSE

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It was a feeling unlike any other she had ever experienced before. This was more than a simple physical attraction. This was beyond lust; it was more of a hunger, a need to satisfy some unknown desire.

Mida was just as surprised at what was happening. The person she was facing was the polar opposite of everything she knew her sister to be. Cynthia had always been the shy, quiet girl of the family. She had always been unique in that regard. With the exception of Cynthia, every single one of Claudia Mason's children had been overly lucky in their sexual development. Claudia herself was gifted with this hyper sexuality, and this had been passed down to her children, in one way or another.

All except Cynthia. Until now.

The white and blue girl was nothing unlike what she used to be, both in appearance and through her actions. While Mida had always been the playful, assertive one during their previous trades of affection, Cynthia was beginning to take charge. The eerie grin that had lodged itself on her face was unlike any expression she had ever shown before. It was a predatory gaze, the look of the stronger creature pouncing down on its prey, in a situation where the latter had no chance of escaping.

Luckily for Mida, Cynthia's intent was not to maim or devour, but rather to enhance what had already been developing during the long shower. Licking and nibbling, squeezing and caressing, all of this had given way to a rougher, more exhaustive form of expression. As confused and surprised as she was, Mida couldn't help but enjoy every passing second of this strange phenomenon.

"So many questions... I'm so curious..."

Cynthia spoke softly, almost a whisper, as she squeezed the large, erect member which had found its way between both of her hands. By this point, she had gradually rolled over, so that she lay on top of her sister, while the water dripped around both of their bodies. However, at the size her breasts had gotten, they were about the only part of her body which directly touched Mida's, other than her knees. Even with the large shower their mother had had built specifically to accommodate the family's large sizes, the sides of Cynthia's breasts managed to press against both of the shower's walls at the same time.

Mida was lucky enough not to have her head lost beneath the expanse of pearly flesh, although this was where her freedom ended. Her entire body was pinned underneath Cynthia's now enormous chest, leaving her arms and legs restrained under the weight. The only other appendage to have escaped mammary imprisonment was firmly restrained within Cynthia's fingers.

This seemed to please Cynthia.

Her eyes had remained closed ever since the strange expression had taken over, but this was in no way a handicap to her movements. Using her expert knowledge of Mida's anatomy, she had managed to wriggle herself around just enough so that the very tip of the oversized shaft bumped against her lips. She confirmed this with a kiss, which made Mida shudder gently, causing small tremors to travel along the fleshy walls serving as the prison.

Feeling the mutual consequences of her actions, Cynthia repeated this maneuver. Another kiss, another quiver. She did so repeatedly, gradually replacing each kiss with a quick nibble, or sometimes even with a small suckle, causing Mida to start sighing or moaning, in addition to the pleasured shivers. Shifting along as best as she could, Cynthia suddenly licked the erect member very slowly, letting her long, scratchy tongue find its way upwards, from around halfway to the very tip, letting it bounce ever so slightly after pulling away. Having just had the length of her arm gently caressed by her sister's feline tongue, giving the wet skin that so very gentle tug, Mida let out a single, low moan, revealing how pleasurable this action had been.

Cynthia's eyes suddenly opened, revealing a strange hunger, and her maw soon followed, exposing the sharp, powerful fangs hidden inside. A mysterious panic seized Mida at this very moment; she knew the strength of a snow leopard's jaw, and she knew the size of her sister's mouth. The large member quickly shifted in Cynthia's hands. All it would take would be a single wrong move, one slip, and...

Mida screamed loudly, but without the slightest trace of pain. The feeling was simple euphoria, a blissful feeling she had never felt before. Cynthia's lips were gradually making their way further down Mida's prized limb, until there was no room to go any further. This meant only about one fifth had vanished inside her sister's maw, while the rest was graced with the firm caress of Cynthia's fingers.

Cynthia's jaw shifted ever so slightly, and Mida's body became as stiff as the part buried in her sister's mouth. There was no way to describe the feeling caused by the gentle biting motions, cushioned below by the coarse, feline tongue. The fit was so tight; Mida couldn't help but wonder how she had managed to reach such a depth within her sister, especially considering the length she sported. Long enough for Mida to pleasure herself, and with the girth to match, she couldn't even imagine opening her mouth wide enough for entry, let alone push it so far inside. Yet she was safe from her sister's sharp fangs, somehow.

Cynthia's movements gradually increased in speed and intensity. Whatever fear Mida had about the safety of her body had been drowned out by the building ecstasy. No one had ever been able to take her in this way, yet there she was, being pleasured in a way she would never have dreamed of. Of all people, the shy, inexperienced Cynthia was the one to do so.

The movements seemed to have no order to them, nor restraint or organization. Mida was the glad victim or a jumble of actions. Sucking against the tightening walls of the mouth, nibbling with warm, wet lips, licking with the scratchy tongue... Even the occasional stroke of the fangs along the warm flesh could be felt now and then, all without a trace of pain, Cynthia's gestures stopping at the precise moment to avoid the slightest form of pain.

Eventually, it would become too much for Mida. She had received more than her share of excitement, and if there was one experienced member in the family, it was her, but faced against her sister's unnatural surge of skill, there was nothing she could do.

She let out a surge of her own, one which would instead manifest itself in the form of a thick, sticky fluid. Whichever few areas of Cynthia's mouth which had not yet been filled by outside flesh were now gone, only to be replaced by the warm, soothing taste of her sister's special brand. Without much of a surprise, Cynthia was unable to contain the entirety of the liquid inside her mouth, even with the way she gulped it down. The white trickles flowing across her lips and onto her breasts soon became rivers, which joined with the pure water of the shower to land onto Mida, who became unable to distinguish the water from her own viscous creation.

This feeling lasted for a few minutes, Mida seeming to deplete the entirety of her substantial reserves into her sister's mouth, all without the movements showing any sign of slowing. The flow eventually diminished, until nothing but the occasional droplet would join in with the mix of water, saliva, and semen. At that point, Mida was unable to move her own body, as Cynthia's colossal weight combined with her own physical exhaustion left her simply sitting on the floor of the shower. There were worst places to be in; she was warm, she was comfortable, she was wet, and most of all, she was with her favourite sister.

Even though Cynthia had removed her mouth from around her sibling, however, she was not finished. Cynthia seemed to have an endless supply of stamina and energy, one which would need a way to be expended. As long as it didn't require much of a muscular effort on her part, Mida had little problem with being the target of Cynthia's lust. She didn't have much choice, held beneath such a weight.

It didn't take very long for Cynthia to reposition herself. Doing so gave Mida a few seconds of freedom, but drained as she was; the fleshy prison soon fell down on her once more. This time, however, she merely had a small section of the gigantic breasts touch her, leaving the bottom of Cynthia's to rest against her own.

The main part of Mida's body which was under pressure was still very sensitive, and had had no time to relax. It was still warm, wet, and very hard, three characteristics which would quickly become more intense when Cynthia surrounded it with her inner walls. The squeeze was incredibly tight, yet somehow, as inexperienced and small as she was, Cynthia managed to fit around it, fully and completely. Cynthia's large bottom was resting comfortably against Mida's own spheres, while the weight was kept off from Mida, and focused on Cynthia's knees.

Mida was too tired from the previous experience to utter any sound other than a few gentle gasps and sighs. Cynthia was just the opposite. She was full of energy, and quickly began to literally pump it into her sister, moving her wide hips up and down. The motions were slow and controlled at first, but the speed gradually increased. With each upward movement, Mida could feel a gentle tug along her hips, one which would seem to gently lift her bottom off the shower floor, only to have it bounce back down with the responding descent.

Despite her vigor and ferociousness, Cynthia's movements were surprisingly gentle, her downward pounding never strong enough to cause a bruise, and her jerking of Mida's length never sudden enough to cause any pain. Somehow, the force of Cynthia's vertical slamming restricted itself to both of the sister's hips, letting the swollen curves cushion the impact. Furthermore, there should have been no way a member so large and hard could fit inside Cynthia, without some sort of pocket universe. Mida never once bothered to imagine how any of this was possible. She was lost in the pleasure.

The rhythm of Cynthia's movements suddenly changed, slowing down slightly and losing some of its steadiness. Her eyes quickly opened, revealing Cynthia's own eyes, with no trace of the strange hunger from before. Unsurprisingly, she quickly shut them once more; as the feeling of her current experience was unlike she had ever had before. Until then, she had been rather quiet, with only the sound of her breathing audible to Mida. At that moment, however, she began to moan loudly, letting out soft, pleasured screams each time she moved down on her sister.

Mida realized the change too, and even though she had no idea why this had happened, she didn't want that moment to end just yet. Using what little energy she still had, she began to move her own hips along with her sister's, further intensifying the feeling.

Eventually, the excitement became too much for Cynthia. The pleasure had reached its peak, opening the floodgates onto Mida below. While she had little left to give, Mida responded in kind, letting her own production mix in with Cynthia's.

Cynthia's joyful climax was even longer than Mida's earlier. There seemed to be no end to her pleasure, which flowed outward and into the drain. When it was finally over, Cynthia collapsed onto Mida without bothering to slide off. Her breasts provided a comfortable cushion as she lay against her sister which lay flat beneath her, gently squished under Cynthia's warm, heavy pillows.

"I... I don't know what came over me..."

"I don't care, that was... That was great."

Mida playfully stuck her tongue out at her sister, which retorted with a smile, her eyes half-closed as she was still reeling from the wonders of the event. Cynthia tried to remake the scene in her mind, but couldn't manage to do so. It was as if she had just blanked out, and some other force had driven her. She couldn't explain it, but she knew it was linked to the shrine she had found two days earlier.

"Wait until I tell mom..."

"Mida, don't! She'll want to see for herself!"

"That's the idea... Then I could watch!"

As much as she enjoyed the euphoria which had resulted from this gradual change within her, Cynthia knew she couldn't spend all her time with her family. She had to go back to the mountains, and discover the secrets of that shrine.

For all she knew, this was only the beginning. Her body was not showing any signs of stopping, and she felt with the utmost certainty that there was more to come. She had just one question on her mind.

"How far will it go?"

The more she pondered this, relaxing atop her sister while letting the water trickle along her back, more thoughts entered her mind.

"Is it just me?"

"Does this hold the key to our kind?"

"Will I want it to stop?"