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"Pull your own weight, she says. Do the laundry she says. I don't know how she likes to wash her clothes. She better not get mad at me if something shrinks or the colors run or whatever." Santiago said, grumbling softly to himself as he scooped up a basket full of clothing waiting to be washed.

The guanaco was already in a pretty low mood. He had been having a rough time making a living for himself, to the point where he had to actually move out of his apartment and move in with his sister, Valparaisa. At least she had been kind enough to take him in. He wasn't sure he would have gotten as generous an offer from anyone else he knew. The benefits of having a twin sister who lived out in the country.

Val had gone off to work for the day, asking only that her brother do his share of the work keeping the house tidy. He couldn't really find reason to object. He just had a difficult time getting out of the unpleasant mood he'd fallen into. Once he had the basket in hand, he carried it out into the living room. There wasn't anyone around for at least two kilometers, so he felt no shame in dumping out his sister's underwear on the floor in the middle of the room. It gave him a chance to sort through things so he could at least try and not ruin something delicate.

And delicate was the operative word. There was a great deal of lace amongst all the shirts, shorts, and socks. Santiago blushed as he looked over his sister's panties and bras. They ranged across a variety of colors. For some reason, the black ones looked especially naughty to him. He shook his head, trying not to think about it that way. As he sorted through them, he noticed that those frilly, provocative undergarments had a pleasant texture to them. There was a part of him that knew it was a terrible idea to go any further than just the minimum required to do the laundry, but he couldn't help himself. He was a curious thing.

He glanced at the clock to check the time. Val had been gone for at least thirty minutes by this point. She wouldn't be coming back anytime soon. He had all day to do essentially whatever he wanted. And more than that, there was no one expected to come knocking. He could have a more thorough looking over the naughtier garments and no one would ever be the wiser.

Santiago picked up the lacy black panties and rubbed his fingers across them. The material was quite pleasant to the touch, leaving him wanting to caress the fabric further. After several moments of appreciating that feel, the guanaco nibbled on his lower lip and lifted them to his face. He gently pressed them against his cheek and rubbed slowly up and down. His eyes drifted shut in the process and a quiet little sigh escaped him. It felt quite nice, nicer than he expected.

"This is a bad idea. I should just get to work on the laundry and forget all about this," Santiago said to himself, suffering from an internal battle, "But the do feel really good. I can't help but wonder if..."

His voice trailed off as he let the idea that had popped into his head linger. It really was a bad idea. They were his sister's clothes and he had no business investigating them like he was. But he was losing out to his curiosity. Moments later, Santiago was up on his feet, stripping out of his clothing. He left his shirt on, but his shorts and boxers were cast off. It had taken so little time to get to that moment, but now that he stood there, looking down at the pair of panties, he couldn't bring himself to move.

Maybe he should do the laundry first, then try on a pair. He toyed with that thought for a moment, then quickly dismissed it. He couldn't put her clothing away immediately after having worn it, felt it pressing against his most intimate areas. No, he would need to go ahead and try them before running them through the wash. That was the only order that made sense. He would try them on, then take them right off, get dressed, and get back to what he had been asked to do.

That little speed bump resolved, Santiago lifted one of his legs and pushed a foot through the waistband of the lacy garment, immediately feeling it brush against his calf, then his knee. It left him trembling just ever so slightly. Part of him was consumed with fear of being discovered. Part of him was alight with the fire of excitement of getting away with such a mischievous act. He lifted his other foot, once the first was on the ground once more, and pushed the other half of the underwear over the second leg. With both feet back on the ground, he pulled the delicate fabric up along his thighs. As soon as it all settled into place, he shivered and permitted himself a soft gasp.

The material felt marvelous against his skin and fur. It cupped against his groin in a way he had not expected to find appealing, and yet there it was. Already he was beginning to come to arousal, and that felt terribly wrong. Everything about this felt wrong. He was standing in the living room of his sister's house, who had taken him in when he was most in need, and he was trying on her underwear. He was wearing his sister's panties.

Santiago slipped his fingers back into the waistband to tug them down, but he stopped almost immediately. A new notion struck him and he walked to the bathroom. Just those few steps gave him reason to shiver all over again. Boxers were comfortable because of how loose they fit below the waist, giving him plenty of air. Briefs were somewhat uncomfortable in that they cradled everything and pressed it all together against the body. And usually the material was somewhat unpleasant, depending on how cheap one was willing to get. This was something else entirely. It felt as though the whole garment was made of silk and when it rubbed against his skin, especially the whole of his groin, it felt like someone was gently stroking over him.

He reached the bathroom and lifted his shirt to have a look at himself. There was a definite bulge in the black, lacy thing, one it had not been designed to contend with. But he had to admit he did like the look of it. And that was a dangerous notion. He couldn't be expected to stop now. He had to keep going.

The guanaco returned to the living room and shed his shirt, rummaging around through the piles of clothing until he found a bra that matched. He wasn't sure if it was a set or if it just happened to look like they went together. He slipped his arms under the straps and pulled everything close. With some difficulty, requiring a number of attempts to practice the act, Santiago managed to fasten the clasp behind his back. Just like with the panties, it felt more comfortable than he had expected. The revelation washing over him, he returned to the bathroom and stared at himself in the mirror. He could not help but think about how much he looked like his sister while wearing her underwear. If only he had the assets to fill out the bra, he could easily pass for her.

Santiago brought his hands up to brush over the two lacy things, one across his chest, the other over his groin. It felt quite lovely, encouraging him to continue on. A soft, sudden inhale escaped him as he gave his groin a squeeze. He was stiffening rather rapidly under such intoxicating stimulation. The head of his length began to protrude from the waistband of his sister's panties, forcing him to realize just how arousing it all was. And it gave him an idea.

The guanaco hurried out of the bathroom, aiming for his bedroom. He needed a couple of things. He dove under the bed to withdraw a plastic storage box he had brought with him when he moved in. The lid was pulled off and he reached in, pulling out a half-liter bottle of a dark purple solution, complete with a measuring cup cap. It could have been mistaken for a large bottle of cough syrup, but that certainly was not what it contained. The other object was a smooth metal rod roughly twice as long as the young fellow's hand, from the tip of his longest finger all the way to the heal of his palm. It was only slightly larger around than one of his fingers, but one end tapered to a gently rounded, blunt end. Missile shaped was how someone might describe it.

The idea left Santiago's heart pounding in his chest. His mind raced as he tried to find a reason to talk himself out of this, but could find nothing to respond with. He was actually going to do this. It was too exciting a thought to ignore. He unscrewed the bottle, carefully measured out the appropriate dosage, then drank down a small cap-full of the slightly sour elixir. It always made his face screw up in an expression of displeasure, as if he had just bit into a lime. But it passed quickly and he waited for it to take effect. It never took long. He rarely had to wait more than a few minutes. The fast acting solution quickly made its influence felt as Santiago shivered. He could feel a strange sense of 'loosening up' spread through him even though he had done nothing traditionally known to bring such a sensation.

He looked at the smooth, metal rod, beginning to tremble softly as he fought to reason his way through what he was doing. Val would be apocalyptically angry with him if she caught him doing this. Sure he could just wash her underwear after he was done, but would he be able to get them completely clean? It was different than the cotton he was used to wearing. He had already come this far. He had no desire to waste the precious 'medicine' he had taken. Best to put it's effects to good use, he thought.

The guanaco sat down and leaned back against his bed, rather the guest bed Val had loaned him, and spread his legs. He brought the metal rod to his crotch, turned it over so that the rounded end pointed down at his length, then began. He lined himself up with it and pressed softly down against his length. He winced, sucking in a soft breath before arching his back while the head of his member was forced to stretch around the cool, smooth object. The chill was what had gotten to him, having forgotten to warm it up before starting. It was warming now, in direct contact with the flesh inside his shaft. Steadily, smoothly, he pushed it deeper. He could feel a cylindrical lump stretch out the underside of his rod as it forced him to bulge.

"Oh god... It's been way too long. I feel like I'm just trying it for the first time all over again!" Santiago said to himself.

He huffed and balled up one of his hands into a fist while the other just gripped the throbbing spire with the metal rod inserted into his urethra. He had been otherwise occupied for the last month or so. It was the first chance he had managed to secure to spend a little time enjoying himself in such a fashion. And that long absence had left him somewhat amnesic to the experience. It made him think perhaps he should go on another 'fast' from time to time, just to reduce his tolerance so he would have to build it back up all over again.

Once he was able to breathe more steadily again, the lace-clad fellow began pushing the rod deeper, stretching out his length all the way to the base, leaving two fifths of the metal shaft protruding from him. The sensation of having something inside him was marvelous. Without any reason other than his own wanton, lust-soaked mind demanding it, Santiago began groping himself all over again. One hand massaged his chest, pressing the silky fabric of the bra against his pelt. The other hand was wrapped around his shaft, pumping smoothly over it. Moisture began to ooze up out of him, adding to the sheen of the polished metal inserted in him.

From time to time, Santiago stopped pumping and moved his fingers lower, cupping over his sac. The twin orbs were trapped inside the prison of lace and elastic of his sister's panties, and massaging himself brought a whole new high to the experience. His shaft throbbed even as he tended to the bulge in the silken material. It occurred to him that he might not even need to properly stroke. So he continued to focus on relishing the soft fabric brushing over his testicles. His palm moved up from time to time to squeeze against what of his member was still covered in the dark garment. He could feel the rigid, unbending rod under his skin, trapped there under his flesh just as he was trapped under the lace wrapped around his crotch.

A moan filled the guest room as he shuddered and curled his toes. A thick, sticky burst erupted from him, forcing the metal rod inside him to slide back out, but not completely. The first gush had pushed it out of the way so he could climax properly. The second saw a small fountain of white blast out of him. It landed on his stomach and seeped down along his fur until it reached the waistband of his sister's panties. Another followed, and so it continued for several moments, leaving Santiago to writhe in ecstasy. When finally he managed to calm down, he looked down at his crotch, still fighting for breath as he saw the mess he had made.

He would need to wash his sister's panties for certain now. He couldn't let her know he had soiled them. To that end, he began to withdraw the sounding rod he had gotten reacquainted with. It didn't get very far before he shivered and stopped. An idea was forming in his mind. If the feel of his sister's panties had done this just while they were wrapped around him from the outside, what would they feel like running along the interior of his length?

Unlike before, Santiago didn't hesitate. He sprung to his feet and rushed to the living room. He didn't even bother removing the sounding rod. Once he was back among the piles of clothes waiting to be washed, he plopped down in the middle of them and grabbed another article of underwear. It was similar to the black pair he was wearing, though it was white. He lifted it and pressed it against his cheek, finding it had the same silken quality he had come to adore from these mysteriously alluring garments. It would do.

With great care, the guanaco eased his sounding rod out of him, making him shiver powerfully. It took him a moment to calm and recompose himself. Then, he took the pair of white panties and awkwardly stretched them over the metal rod. With a little deliberation, he managed to find an orientation that helped keep the material taut across the head of the rod. Then, he repeated the action he had engaged in just moments ago. The tapered end of the rod was pressed against the slit at the end of his member, forcing him to stretch open once more. Only this time, instead of feeling the smooth, featureless metal of the stainless steel rod, he felt the silken touch of the stretched garment.

Santiago's eyes almost crossed then and there as he felt the teasing sensation of fabric slowly drag against the exceedingly tender interior of his spire. They were quickly soaked in his sticky arousal. It made the process slightly more difficult, requiring him to add more force behind the rod. Eventually, he managed to push all the way down until he could feel the end of the metal shaft reach the base of his length. Only about half of the lacy garment was now trapped inside his member, and it felt indescribable to him. How had he not thought to try this before?

Probably the lack of access to such frilly panties had kept it from clicking into place.

Just as he let everything settle, he was struck with a notion. He had gone and had his fun. He should stop and get to work. After all, Val's impending wrath was starting to claw away at the back of his mind. Santiago pulled on the rod, drawing it back out of himself. But the panties remained. He couldn't help but jerk as he felt his shaft closed up around the silky material now keeping him stretched, though to a lesser extent than his sounding rod did. He would have to pull the panties out by themselves. And when he made the attempt, gripping what of the material was protruding from him, the instant there was even the tiniest drag against his flesh from within, he felt like he had been struck by lightning.

The guanaco's voice filled the room and he froze. This was a serious problem. He could not help himself. He needed to feel that again. Another pull sent a second jolt of electricity through him. The rod returned, shoving back down inside the soaked passage to push his sister's panties deeper once more. He began pumping away firmly, dragging the garment up, then tamping it back down with the steel rod. Over and over he did this before finally practically screaming. Another sticky mess was made, adding to the first. But there was a problem. He no longer had a grip on Val's panties.

Santiago looked down to find the white, lacy thing was nowhere to be found. He also noticed that there was a sense of tightness about his scrotum. When he explored it, he felt the two orbs had grown, and they felt as if there was something stretching them, something that yielded in a sponge-like manner. Then he felt something under his skin that he could not believe was there. It was a square-shaped something, thin and flexible. It gave under pressure, but he realized almost immediately what it was. It was the washing instructions tab in the back of the white pair of panties. He had shoved them in so hard that he had lost his grip on them and consumed them completely. They were now stretching his sac out. And it felt amazing. It was like a drug. And he had to have more.

Another pair of panties was selected to be sacrificed next. Santiago wrapped them around his sounding rod like the first and began stuffing them into himself just as the first. Just like before, the feel of the soft material rubbing along his insides was euphoric, forcing him to carry on. In less time than it took for the first, he had completely lost a second pair of his sister's underwear to his insides. His sac was swollen even larger. He equated the firm feeling when he squeezed one of the orbs to stuffing a wadded up sock inside another sock, only denser.

He was in trouble all over again. He began looking over all the other pairs of panties he had been told he needed to wash, imagining them all as a 'meal' for his shaft. Without removing the sounding rod, Santiago returned to the guest bedroom and downed another dose of the mixture. He felt it take effect, granting him another boost to his elasticity so he could carry on, and did exactly that. One by one, the guanaco took Val's panties and stuffed them down his shaft. There were at least eight pairs, not counting the dark, lacy number he currently had hugging at his rump and crotch. His scrotum bulged larger and larger with every addition he sank into himself, eventually finding there were no more panties to enjoy.

He needed something more. He couldn't stop now. He was obsessed. So he reached for the next best thing within arm's reach, one of Val's bras. It was a remarkably different creature, possessing hard structures, like the clasp and the underwire which both gave somewhat easily. It gave his hungry length reason to stretch into new and unusual shapes, unlike anything he had felt before. He screamed as he made another mess across himself for at least the fifth time as he progressed. The first bra had been enough to solidify his need for more of both. And so one by one, he added every piece of underwear available to him from the basket of laundry.

When all that remained were shirts and pants, Santiago was laying on his back, panting, covered in an impressive amount of his own seed. His sac had grown further. Before he made the leap to taking Val's bras, he felt like he had a pair of oranges between his legs. Now, they were grapefruits, large ones. And he could not stop massaging them. The black pair of panties he still had on refused to contain the enormity of his new sac, making him grin, actually proud of it. It did however alert him to the fact that he had two more articles he could add to the growing pile inside him.

Carefully, finding that the slightest pressure could send shockwaves of electricity up his spine, Santiago slipped out of the black panties and lifted them to his face. He rubbed them against his cheek affectionately, then dared to do something he had not though to try before. He pressed the groin of the fabric to his nose and inhaled. He detected the familiar aroma of his own scent on them, but it was faint compared to what overwhelmed his presence. He could smell Val on them. And the fact that he knew it was her, and that he actually relished it left him a little dizzy. It was so wrong. He was actually turned on by the smell of his own sister, the aroma soaked into her underwear.

A powerful urge claimed him and he had to obey it. He removed the sounding rod from his shaft, wrapped the panties around it, and began inserting them into himself. He waved goodbye to the black fabric, grinning like a fool, then moaned as he shoved them in. The steady pumping of his hand saw them mashed deeper and deeper, joining the other pairs he had hidden away in himself. When they were gone, he sighed, then squirmed, trying to unclasp the bra he was still wearing. Eventually, he freed himself and watched as the last piece of lingerie belonging to his twin sister disappear down his rod. It left him moaning loud enough to be heard all over the house, but he did it. And he was amazed at the powerful satisfaction that came with it.

"Holy shit. Who would have thought? It's like finding a cheat code for your favorite video game." he said with a laugh.

He had taken every piece of underwear belonging to his sister and stuffed them into his scrotum. And now he was reveling in how far he had stretched to hold everything in. There was nothing he could think of that would make it feel better. Or at least he believed that to be the case, right up until he remembered that what had been in the basket wasn't everything. Val still had more panties and bras.

Santiago's eyes flew open wide as he came to that realization. He sat up with a jerk and whipped his head about to look towards the hall, imagining the room that lay at the end of it. Val's room. She had more there. And he wanted them. No, he needed them. He had to find every piece of naughty underwear she had and send them all down his rod to bulge his sac as much as he could. The guanaco leapt to his feet and hurried down the hall, making a quick stop in the guest room to take a third shot of the stretch-enabling elixir. He wasn't sure how much he would find, so he made it a double. Better safe than sorry.

His next stop was Val's bedroom. He pushed the door open and found the space just as he had seen it before. The bed was large enough for two. The decor was simple but held the lady's personal touch. A chest of drawers stood on the far wall with a mirror on top of it. Just off to one side was a large, glass enclosure with a long, mature python coiled up comfortably inside, Val's pet snake. She was a friendly thing, enjoying being let out to explore and be lavished with attention. She slowly lifted her head as soon as she detected the motion outside the enclosure, expecting to be shown some sort of affection as Val had gotten her accustomed to. But that wasn't why Santiago had come today.

The guanaco made his way around the bed to the chest of drawers, his shaft still rigid and occupied by the steel rod. He began looking through the contents of the wooden thing, cursing quietly as he found shirts, shorts, socks, even a few skirts, but nothing in the way of lingerie. Not until he reached the lowest drawers. There he found the mother load. His eyes widened as he found such variety that he could scarcely imagine why anyone would need so much. Clearly his sister enjoyed dressing up in provocative attire.

He had to have it. All of it. His drive was too great to ignore. Santiago began pulling the stacks of frilly, lacy, exotic garments out and sat them on the floor. One by one, he began sending them down his shaft just as he had everything from the basket. Slowly, his scrotum swelled to contain everything he was feeding it. He wasn't as gentle now as he had been earlier, greedily shoving everything he could down his spire. He reveled in the stretch as it went in as well as the resulting addition to the two growing orbs below. It was like a sort of drunkenness had consumed him. He couldn't think clearly about anything except satisfying that powerful need.

Within half an hour, he had taken every last scrap of clothing he had managed to find in his sister's underwear drawer. He had rubbed them over himself, mashed them to his nose to smell her on the fabric, what faint hints could not be washed out in the laundry. He had even found other items he had not considered before. Panties and bras were their own special source of stimulation, but then came thongs, bikinis, garters, and a couple of camisoles. What had been the most difficult challenge, and ultimately the most satisfying, was a bustier he had found at the bottom of the pile. That had sent him screaming all over again.

There Santiago lay on his back, needing to clean himself rather badly. Everything he could find that had anything to do with his sister displaying her sexuality had been taken and shoved down his shaft. What had been a pair of grapefruits was now a pair of oversized pomelos. And the sense of fullness was overwhelming. He groped at the two grand orbs, squeezing them softly, but careful not to tease himself too much, for fear he might go off again. He couldn't get lost in his lust without cleaning up a bit first.

With a groan, the guanaco sat himself up, then climbed to his feet. Val's bathroom was the closest, so he wandered in there to figure out his next step. He had to let it all out eventually. He couldn't just go around keeping his sister's kinky underwear stored in his sac. She would want it all back eventually. Not to mention how angry she might get if he didn't have everything back in place before she returned.

Santiago turned on the shower and stepped in, not bothering to wait for the water to warm before doing so. He shivered softly in the cold, then relaxed as it warmed. Already he could feel the considerable sticky mess he had painted himself with rinsing off of him. He would need to lather up to make sure he got it all. As he reached for a bottle of what he thought was body wash, he spotted something curious. It looked like his sounding rod, but it was wider and shorter. And it had a black rubber button down near the flatter of the two rounded ends.

He picked it up and examined it carefully, turning it over in his hands before daring to try the button. Immediately, it came to life with a buzz that rocked the entire sleek device. It startled him and he tried to press the button to turn it off. It only made it buzz harder. Another press saw another increase in the strength of its gyration. One more press silenced the whole device and he gasped. His eyes widened as he realized what it was. It was Val's vibrator. He didn't know she had such a thing, let alone kept it in the shower.

The guanaco looked down at his still erect mast, the sounding rod sticking out of him. He had not bothered to remove it yet, and seeing it like that brought a new thought to his still sex-drenched mind. It was a bad idea, he knew that. But he could not bring himself to push it away. The sounding rod was slipped out of his aching shaft and set aside. In its place, he began to slip the wider, silvery bullet-shaped device. A groan filled the stall as he stretched open once more and consumed it. This time, he kept a firm grip on the thing so he wouldn't have to worry about a repeat of his first happy accident.

He sank it deeper into his member until the head was kissing just around the edge of the button. With a degree of trepidation, the now well soaked guanaco gave the button a press. The vibrator buzzed to life, sending a jarring, mind-shattering tremble through the whole of his member. He jerked in surprise and almost slipped and fell. His breath came in short gasps, his eyes bulging. It was unlike anything he had felt before, and he wanted to see what would happen if he pushed the button again. The device was made to shake about harder, the medium setting making the guanaco's entire form tingle as he bit back a scream. He couldn't stop. Not now.

The third and final setting was attempted, making his shaft twitch about with extraordinary strength. Santiago lost his grip on the sleek object and mashed both of his hands against the smooth tile walls of the shower. His voice rose once more, signaling another climax. Thankfully, the spray of the water helped rinse him clean before he completely finished. And it took him a while. The buzzing device slipped out of sight, claimed by his greedy spire and sent deeper and deeper. Soon, he could feel the curiously pleasing thing quaking away in his bloated, almost painfully engorged sac. It left him unable to sit still, squirming there on the floor of the shower.

Slowly, as he came to acclimate to the trembling, it began to fade. When it finally stopped, he grew worried. Had he broken his sister's toy? Had it gotten so soaked in his seed that it shorted out? He groped at his giant scrotum, trying to find evidence of the vibrator's presence. He could find no trace of it, not its shape, not its buzzing, nothing.

"What the... oh god, what happened? What did I do!?" Santiago said as he began to panic.

For a few moments he continued to grope at his sac, trying desperately to understand what had happened, but the more he did, the more he groaned, quickly becoming awash in a sea of lust. Letting the sleek toy disappear down his member had given his gurgling, sloshing orbs reason to swell further. And a desire began to override his better judgment. Were he in his right mind, he would have tried to push everything back out then and there. In fact, he might not have gotten so carried away in the first place. But he wasn't in his right mind. It felt like he was drunk, unable to follow his actions to their outcome. And a new idea was forming.

Santiago turned the water off and stepped out of the shower, deciding he needed to go hunting once more. He toweled off and began rummaging around Val's room, finding a plastic storage bin under her bed very similar to his, both in shape and function, as well as the purpose of the items it contained. It was curious how easily he had managed to find his sister's collection of toys, the ones she intended to keep near the bed rather than use in the shower.

They ranged in size, color, material, and style, but they all had one thing in common. They were long, sleek, and promised no end of stretching to whatever they were inserted into. Some of them were quite large, making the guanaco wonder a little about what his sister looked for in a partner. Not to mention if she had actually found anyone so well endowed.

The lust-drunk fellow took the first dildo from his sister's collection, turned it about so that it bumped head to head with his own pulsing, throbbing length, and began working to push it into himself. He had to. He could not control the urge. A yowl filled the bedroom as he progressed, finding it shockingly easy to swallow something so grand. The fact that it was as flexible as it was presented a new challenge, but it didn't stop him. Soon, he could feel the artificial swell of the rubberized scrotum at the base of the fake member slip into himself. The bulging of his length left him just as enraptured as ever, and after the toy was deposited into his sac, he noticed that there was a different sort of swelling.

His shaft had gained a small degree of size, in both length and girth. It wasn't that the foreign item he was pushing in had somehow added to his mass. It was more as though the effect of that stretching had not worn off. That spurred him onward. How big could he make himself by just shoving progressively larger things into his hungry rod? A feeding frenzy followed. Santiago obsessively began cramming his sister's toys into his engorged flesh, consumed by the need to stretch larger and larger. And so he did. His scrotum bulged with every addition, gurgling audibly as it was made to contain more and more.

When Val's box of toys had been emptied, the guanaco sat there next to her bed, panting, groping over his sac. He now had a pair of watermelons resting between his thighs, and his length had grown as well. It had not kept pace, but then it wasn't actively holding so much mass. He had grown half again as large as he had started off, and that was enough cause to celebrate. With any luck, he would remain so handsomely large. And perhaps he could continue to experiment and grow further in time. A curious, satisfied smile remained spread across his lips as he huffed, needing to go shower again. He had made his fur sticky once again with the numerous eruptions that had come as a result of his crazed efforts.

And yet, lingering there, in the back of his mind, building slowly back up was the need, the urge, the compulsion to continue. He had to find something more he could swell himself out with. But he couldn't think of anything else he could make use of in such a lewd fashion. He didn't want to just shove all of Val's clothing into him, no matter how amusing it might be to make her go nude. And he was certain it wouldn't feel half as good as her lingerie had. Nor would his own clothing. He sat there for a few moments, trying to find a solution to the problem that had presented itself in his drunken state. Then his gaze fell upon the glass enclosure.

Val's pet python peered out at him, wondering if she was going to be let out to receive any sort of affection. It wouldn't be the first time Santiago had been the one to retrieve her from her tank. A pang of guilt stuck in him like a thorn, but it was quickly pulled out by the thought of just how much he would stretch to hold that big girl in. The guanaco climbed to his feet, trembling and unsteady from what he had put himself through so far. He stared at the serpent for a long while, trying to talk himself out of it or into it. It struck him that he wasn't prepared to take something so massive, so he hurried out of the room.

The act of walking, or in his case jogging, brought an entirely new sense of pleasure. His scrotum swayed and bounced as he moved, jostling and slapping against his thighs. The tingling waves of electricity those engorged swells fired off up his spine sealed the deal for him. He had to try. But first, he needed to prepare. The bottle of 'medicine' was collected and carried back to Val's bedroom. He read over the instructions, trying to figure out what kind of dosage would be needed for something so ambitious. There was only a vague explanation. After a few moments of frustrated calculations, he gave up trying to determine how much would be enough, removed the cap, and upended the bottle.

Several good swallows later saw him having drunk what looked to be a quarter of the contents. That would be plenty to give him enough stretching power, surely. The same tickle of its effect washed over him in as short a wait as he had come to expect, and he put the bottle down, capped and out of reach for the time being. He didn't want to accidentally knock it over should he get too out of sorts.

Santiago approached the tank holding the python and stared down at the pale snake. She looked back up at him in curiosity. The lid was lifted and the serpent poked her head out to say hello. She began slithering her way up towards the guanaco, expecting him to left her up and out. He did exactly that, settling down on the floor with the python in his arms.

She was heavy. Very heavy. She was three and a half meters long after all. The creamy white and yellow snake coiled up against the fellow who had freed her from her tank, bumping her nose against his chest and shoulder as she moved along, wanting to inspect him. It was normal for her to do such a thing. She had been well socialized by Val. Santiago's heart began to pound as the idea of what he was doing washed over him. Carefully, gently, he guided the python's head down from his chest to his groin. She began investigating what she found there, curious about this odd, stiff thing protruding from her master's doppelganger.

With a little coaxing, he managed to get the snake's head to meet with the head of his spire, and from there, he found it surprisingly easy to continue. He yawned open around the serpent and she slipped in. There was some gentle struggling initially, and that made Santiago dig his fingernails into the carpet. But soon she calmed down and began to push forward. Wider and wider he stretched, feeling the python descend into him. His member ached, actively beginning to 'swallow' of its own accord. It gulped great swaths of the serpent, pushing her down into the already monstrously swollen scrotum below.

Santiago fought against the power of the experience threatening to make him pass out. He slipped into a trance-like state, not entirely conscious, but certainly not asleep. All he could do was recline there against the side of Val's bed as her pet python slithered its way through him, swelling his almost painfully stretched sac. When he felt the last of the snake's tail slip into him, he groaned and groped at his groin. He was enormous now. Cartoonishly so. What had been a pair of watermelons was now large enough to make it look like he was the proud owner of a set comparable to those rubber ball toys children sat on and used to bounce around the house. He could feel the snake writhing about inside, and that drove him to utter madness.

There was no way he was going to be able to go anywhere in such a state. He could hardly bring himself to move under such powerful euphoria. The consequences of his actions didn't hold any bearing on his thoughts at the moment. They would eventually, but not right now. Right now, he simply wanted to bask in the deep, intense satisfaction filling him.

That basking lasted for hours. It lasted so long that the day passed and Val returned home, walking in the door to find piles of dirty clothing spread out on the floor in the living room. She sighed and frowned. He had made the attempt to sort the laundry, but never got further than that. Given the state of mind he had been in since moving in with her, she wasn't terribly surprised.

"Santiago! I'm home!" Val called out, setting her things down before beginning to look around the house.

She found it odd that he wasn't in the guest bedroom or any of the common rooms. It led her to wonder something, so she followed up on the thought. It brought her to her bedroom, where she found her twin brother sitting on the floor, in a dazed stupor, naked, and heavily swollen between his legs. She saw that the enclosure for her snake was open and empty, as well as the box she had kept her adult toys in. Rage began to fill her, mingled with concern for what had happened to her brother.

She couldn't tell if he was in pain, sick, or if something truly horrible had happened to him. But she certainly intended to find out.

"Santiago! What the hell!? Why are you in my room!? And oh my god what happened to you!?" the lady shouted the instant she laid eyes on him.

In that moment, her brother began to emerge from his vacant stare. He looked up at her, his eyes widened, and he immediately attempted to leap to his feet and cover himself.

"Val! You're back! It's already that late in the day!?" he cried in dismay.

"Yeah it is! And you haven't done the laundry! You've done something I can see but what the hell is going on here!? Why are your balls so big!?" the angry woman shouted, glaring hard at him now that it seemed like he was just fine.

"That's... that's a bit of an interesting story." Santiago answered.

The next fifteen minutes saw him attempt to relay to his sister what he had gone through after she left. It was difficult concentrating on telling the story when his scrotum was so bloated and distracting. It had shrunk, half as large as it had been when Val's python slipped in, but that still left him with two obscenely enormous bulges attached to him. Anger had been the lady's first reaction, naturally. He had done some horribly inappropriate things with her clothing. He had come into her room without permission and rummaged around through her things all in service to this 'hunger' as he had tried to describe it.

Then he told her about the toys, how it felt and how he could not stop once he started. He expected her to yell at him more, and she did, but not as much as he thought she would. As he spoke, he took moments to apologize profusely, lowering his head every time Val raised her voice, then continued on when she permitted him to. When he finally got to the point where he had to tell her where her pet snake was, he squeezed his eyes shut and squeaked out the explanation.

"Wait, so she's in here?" Val asked, oddly calm as she reached forward and poked her brother's scrotum.

The act made him shudder powerfully, biting back a moan as best he could. Showing how much he enjoyed her touch might have seemed callous.

"Y-yeah... I just... I couldn't stop myself. I wanted more. I needed more. And once she was in, I couldn't even stand up I was so heavy. I think I hit my limit. I don't have words to describe how good it felt. Please forgive me. I know I've done something really, unbelievably horrible, but... I just couldn't stop!" Santiago begged, clasping his hands together in front of his chest.

He would have gotten down on his knees, but he was afraid doing that might knock his sister off her feet when he shoved his sac forward against her claves.

"Yeah... you've done something horrible alright. You stole all my underwear, all my sex toys, and my pet snake! And I'm gonna go out on a limb and guess that I'm not getting any of it back! So now I have a lotta stuff to buy all over again!" Val said loudly, standing with her arms crossed.

"No... no I don't think so." Santiago replied quietly, averting his gaze.

"Yeah, figured as much," the lady said, then sighed, "I should be absolutely, unbelievably pissed off at you for all this... but-"

"But?" her brother lifted his eyes, daring to sound quietly hopeful.

"But... I'd be lying if I said it didn't sound hot. You clearly had a blast with your little adventure. I honestly didn't know you were into shoving things down your dick. It sounds like something I would have tried if I were in your shoes." Val said.

"So, you're not mad at me?" Santiago asked.

"Oh I'm mad at you. My pet snake is gone. So are my toys. And now I don't have any underwear except what I have on. You're going to have to do something to make this right." the lady said, jabbing a finger in against her brother's chest.

"W-what do I have to do?" he asked.

The lady's answer came in the form of a kiss, a hard, passionate, lust-driven kiss. In a flash, she was out of her clothes and pushing Santiago onto the bed. They were brother and sister, twins no less. But they were no stranger to the idea of intimacy between them. It had not gone very far in the past, but the suggestion was there. And Val had found the notion of her brother moving back in with her just a little exciting, imagining the two of them exploring that side further. And now she was making it happen.

Santiago didn't resist. He needed relief from the pressure between his legs, and he had thought about his sister more than once while pleasuring himself. The two locked hips and ground against one another. It had felt wrong, dirty, but now they were going forward and there was nothing to stop them. Their voices filled the room as they joined, the young man's enhanced size being put to good use. They tumbled about, changing positions again and again, wearing one another out until at last, neither could find the strength to move.

The sun had set by the time they had finished. Santiago's scrotum had shrunk considerably, though it still showed a very generous swelling. He probably could have kept going, but he was utterly exhausted. As was his sister. And while he had shrunk, she had grown. Her stomach was round and full, containing a small lake of her brother's seed. So vast was her tummy now that she could have been mistaken for having swallowed an exercise ball.

Val sighed happily as she pressed her back in against his chest, keeping his arms draped around her. There was a powerful sense of content between the two of them that neither could deny. They didn't bother with dinner. Instead, they simply fell asleep in each other's embrace. It was one of the best nights' sleep either had ever had.

When morning finally came, Val woke to find that while her stomach had shrunk quite a bit, it still wasn't completely flat. Now, she could have passed as very near ready to give birth to a pair of twins. Santiago had shrunk as well. His scrotum had deflated, now back to a more manageable size, only slightly smaller than a pair of watermelons. They were still quite tender to the touch, which was quite lovely indeed, but that wasn't the only change. While part of him had shrunk, another part had grown, and it left Val giddy with glee.

"Wha... How the hell did this happen!?" Santiago asked in shock.

He lifted his hands and cupped them against his chest, finding he was in possession of a pair full, firm breasts. If he had to guess, he would have sworn his were bigger than his sister's, at least by a little. And it didn't appear to bother her at all.

"Oh my god, look at you! I don't know what caused this but it's great!" Val cried, leaning forward to press her own hands in against the warm flesh her brother now carried.

It brought a soft moan from Santiago and what had been a discovery of dismay was now one of growing delight. The pair spent a good portion of the morning teasing and tickling the boy's new bust, making sure to give it all the attention necessary to determine how best to stimulate him. Eventually, they decided it was time to actually get out of bed. As it happened, Val had an idea of what she wanted to try next.

"Are you sure about this?" Santiago asked as he was led from the house.

"I'm sure. I've done some fairy lewd things with him. This should be interesting. I wanna see this trick of yours first hand. If you can do it with a snake, then you shouldn't have much trouble with an alpaca." Val said, holding her brother's wrist as she walked him out to the barn.

It had been suggested while they were still in the house. The freshly altered fellow had been hesitant to say yes, but he had not said no outright. He said if it was to happen, he would certainly need to drink more of his stretch-enabling solution. Val had made sure he had done that. She had him drink half of what remained, just to be on the safe side. Now, they were walking into the barn, heading directly over to the stable where her pet alpaca was. He was a fine specimen, and immediately showed interest as the lady approached. Clearly he thought he was going to be shown the same kind of attention Val had 'trained' him to associate with her.

She led him out of his pin and had him lay down in a nice, comfy pile of straw, then brought Santiago over to sit with the two of them. She looked to her brother, then cocked her head in a manner to suggest 'go on then'. The idea was appealing. He remembered how indescribable it was letting Val's snake slither into him. Now he was being asked to take something arguably larger. It would definitely be a bigger stretch for him. That much was certain.

With a degree of trepidation, he scooted closer and reached up, stroking along the alpaca's neck. It brought the tame creature's head down towards him, bumping his nose against the feminine fellow's stomach, sniffing and investigating. It reminded Santiago of the snake.

Not one to stand on ceremony or delay the inevitable, he coaxed the alpaca's nose lower, bumping it against his rigid length, already beginning to drool softly in anticipation. It was a curious moment. He received a soft licking from the exploring beast, making him shiver. With a little more coaxing, he pressed his rod against the alpaca's nose and began the process just as he had with the python. His member spread out over the animal's muzzle, taking him in surprisingly quickly. The alpaca tried to retreat initially, feeling like a jerk in panic, but he calmed down quickly. The process continued, seeing the animal's head slip out of sight, bulging the guanaco's shaft tremendously.

Santiago moaned, squeezed his eyes shut, and leaned back, not even bothering to use his hands. The rippling undulation of manhood would take care of it. The first good swallow began the long trek down the alpaca's lengthy neck, promising to keep him stretched for quite a while. When he felt the animal's nose reach the base of his shaft, he expected to feel him descend into his sac, just like everything else had, but that didn't happen. Instead, the bulging presence inside him turned and angled up. Santiago gasped as his eyes flew open, darting down to his groin.

Instead of his scrotum receiving the creature's head, he felt it pushing up into him, giving his stomach reason to stretch and swell. And it was far more powerful a sensation. It felt like a bomb had gone off inside him, sending a tidal wave of stimulation through him.

"What... the hell!? Where's he going!?" Santiago cried in dismay.

"If I had to guess, I'd say he's not headed for your balls. He's going into your prostate." Val said with a grin.

She had wanted to see her brother's sac distended and squirming with her pet's presence, but oddly enough, this was more gratifying to her. And his entry hastened the more Santiago struggled to keep still. It was just too much for the poor, transformed guanaco to handle. Val moved around behind him, wrapping her arms about his form to hold and support him, while at the same time giving her access to his lovely chest. She squeezed and massaged the swells which had mysteriously appeared overnight, enjoying how much it made her brother moan. She watched as the alpaca's shoulders were slurped up, sent down the ravenous shaft, and added to the swell in Santiago's middle.

The creature's barreled chest stretched him further than anything he had ever felt, making him scream and soak the alpaca's silky-soft fur. It was a sensation not unlike the first set of panties he greedily shoved into himself. Only this could move and struggle. Each time the beast did, it made him jerk and twitch, then swallow him deeper. The animal's hindquarters reached the head of his spire at least ten minutes after he started. His abdomen had grown so large he was going to have a difficult time standing, and there was still so much more to go.

Minutes passed as Santiago writhed and screamed himself hoarse, fighting for breath, unable to get enough of what was happening to him. This stretching of a different organ was too much for him to endure, and yet he never lost consciousness in spite of it. He was a useless, drooling, wriggling, screaming mess, but he was awake. When he felt the beast's hind legs slip through him, ending with a pair of padded feet being slurped up, he finally fell limp, his chest heaving. The alpaca was drawn completely into his vastly stretched tummy, filling the sticky interior of his prostate. It was done. And still, he could only barely breathe.

Every stroke, grope, or touch against his stomach stimulated that heavily bloated organ. It left him feeling like he was about to explode. Val was rather pleased, tending to his belly as he lay there squirming weakly under the wobbling dome.

"I didn't think it could be done, but you did it. And holy crap was that hot." she said.

The act had cost Santiago the ability to walk, at least for a time. It took days for him to shrink back down to normal, though only one day to be able to carry himself on his own feet again. And being so swollen, waddling about the house, jumping at every touch to his middle, he couldn't help but delight and thrill at it. Eventually, he noticed his middle had stopped shrinking, though it had not flattened out completely. Val's had not either. It was some cause for concern for both of them. The lady decided to take steps to determine if it was indeed what she initially was concerned it might be.

She emerged from the bathroom, holding a plastic stick in one hand, staring down at it as she held her other hand on her stomach. She looked up from it to gaze at her brother, too stunned to appreciate his feminine form.

"Santiago... I'm... I'm pregnant." she stammered.

Santiago looked up at her, having been holding a stick of his own, his eyes wide.

"I... I don't know how... but I am too!"