The weekend had been forecasted to be bright, sunny, and hot: the perfect conditions to host a small gathering. Quaxly had a place with a pool and texted his friends to come over and hang out. They all agreed to come over in a short amount of time, all knowing how it would be on the day of. When said day was upon them, Quaxly had everything already set up for him and his friends. The pool had been cleaned, the water was at the perfect temperature, and there were even snacks left out for all of them. 

Knocks on his door were heard and the water-type pokemon all but scurried into the living room to answer it. The first arrival was Greninja. Quaxly made a joke about his ninja speed being the reason for the other water-type’s early appearance. Greninja responded with a sarcastic chuckle of his own, rolling his eyes but smiling. He had the skills that came naturally to his species, but this Greninja was different from most, possessing shorter limbs and having a slightly chubbier build. He had also brought some snacks of his own. 

“Can’t wait to hear the same joke two more times,” the dual water-type said  as he walked alongside his friend. He was already dressed for the pool, wearing nothing but a red speedo. It was hugging his body almost too tightly, leaving little to the imagination. Quaxly was pretending that he didn’t notice, encouraging Greninja to enjoy himself while he waited for the others to show up. 

The wait wasn’t very long. Quaxly was moving right away when he heard the knock. Answering the door, he was met with a big purple pokemon panted heavily. 

“I...I’m not late, am I?” Asking with a bit of desperation was Gengar. Gengar was the biggest friend he had, both tall and pretty wide in just about every way. Thick arms, legs, an expansive soft belly that was out on display. Dressed in nothing but swimming trunks and sandals, the ghost/poison-type was visibly sweating, most likely from needlessly running his way all the way here. 

“You’re only the second one here,” Quaxly said, holding back a snicker. 

 Gengar groaned, obviously realizing that all of that effect had been for no reason. He had feared missing out on the promised fun. For the time being he needed a moment to collect himself and was grateful to be let into the coolness of the home’s air conditioning. 

Guiding the heavyset pokemon, Quaxly noticed that not only was Gengar sweaty, but he was also smelling of musk. He knew that the plump dual-type lived farther away than the others; that long run combined with the heat outside had caused Gengar to work up quite the sweat. Not saying anything about it, he brought Gengar out where the pool was, where Greninja was already swimming. 

Being shorter and thicker than the average greninja did little to hinder his natural swimming capabilities. He was moving through the water with ease, making quick repeated movements. 

“Show off,” Gengar muttered as he watched their friend go from one end of the sizable rectangular pool to the other. The purple pokemon wasn’t ready to start swimming yet and instead laid himself on one of the foldable lounge chairs. He inhaled and then sighed deeply in contentment, taking in even more of the sun, an odd sight considering his kind were known for sticking to the shadows. 

And then came another round of knocking, signifying the arrival of the last guest to the small party. On the other side of the door was Sableye, the smallest but most eccentric member of the group. He came dressed in ordinary swim trunks as well, looking very excited. In fact the ghost/dark-type looked more excited than ever and Quaxly had a feeling that it wasn’t just because of the small pool party. 

“What’s up?” Quaxly asked, feeling that the smaller pokemon would absolutely burst if he didn’t. 

“I found the most amazing gem!” the crystal-eyed pokemon all but blurted out. That was a phrase that Quaxly had heard before, many times in fact. Sableye was an avid gem collector and had an entire horde of them back home, differing in shapes, colors, sizes, and effects. Some were able to do things, like allowing a pokemon to use moves they wouldn’t be able to or to make it seem as if they had changed types entirely, having entirely new resistances and advantages. 

“No, this one is much different!” Sableye revealed the gem in question and it did look very unique. It was in the shape of a heart, smooth and perfectly rounded, as if carved instead of naturally formed. And it had a small pulsing glow to it, easier to see when Sableye was standing in the middle room with it. “It has Manaphy’s Heart Swap encased inside of it.” 

“Manaphy?” Quaxly repeated. Even though the gem truly looked like no other, the duck pokemon was finding that very hard to believe. 

Sableye saw his friend’s skeptical look. “I can prove it. It’s supposed to work in direct sunlight.”

“Hmm...alright, let’s see,” Quaxly agreed, deciding to humor the ghost/dark-type. They went outside to where the others were. Completely out of the shade, in direct line of the sun’s rays. Sableye raised it high and the light within the crystal started to radiate outwards, becoming bright enough to make all of them wince. Gengar and Greninja were completely unaware of what was going on, but suddenly felt strange. 

The light quickly died away, leaving the 4 wondering what had just happened. Gengar was still wincing, seeing the light shrinking in the crystal through his narrowed eyes. But he hadn’t been the one holding it, and he had been laying on the lounge chair. So why was he standing on the patio..? 

Looking around and at himself, Gengar realized that he was in a much smaller body than his own. “Huh? What’s-” From the corner of his gem eyes, he saw himself rising from the chair, also looking around with confusion. But how was that possible? 

“H-ha! It worked!” Sableye exclaimed, speaking with Gengar’s voice and piloting his body. “The Heart Swap gem worked!” 

“Sableye! What’s going on?!” Marching up to the smallest pokemon was Quaxly, not in his body but in the ninja frog’s. 

“You’re talking to the wrong one!” Sableye called, waving with gengar’s hand. “And I told you the gem has heart swap power!” 

Quaxly was dumbfounded, stopping and realizing that everything that Sableye said was true. He was no longer in his own body, but Greninja’s. And Sableye had swapped bodies with Gengar. 

All of them were of course disoriented by the initial swap but slowly they were regaining their senses and realizing  what had happened. There was no way any of them could deny it. So they instead started to explore the body they were currently inhabiting. 

Quaxly groaned from the speedo that was clinging to his body. He had seen how tight it looked on Greninja’s body but feeling it for himself was something else entirely. He could feel it pressing on his loins, causing a bit of discomfort. Naturally, he moved his hands down to loosen the speedo a bit. Doing so in a casual way, nearly forgetting that he wasn’t in his own body, Quaxly didn’t just adjust the speedo but he also groped at his own loins. 

He realized that it wasn’t his own when he felt how thick the flaccid shaft was. Instead of removing his hand, Quaxly let his curiosity guide him into rubbing and groping the shaft through the thin fabric, making it twitch and expand. Doing this was making the water-type softly groan from the pleasure that was familiar yet different. Greninja’s hands were bigger than his own and smoother too, sending unique waves of pleasure through him. 

His other hand had moved around to tug the speedo out from in between the frog ninja’s rump cheeks. He kept his hand there and started to rub his, or rather Greninja’s butt, feeling up an ass that was bigger and more sensitive than his own. 

Sableye was in a similar position. He was in a much bigger and heavier body. Sitting down instead of standing up, in the sunlight’s direct path. He sniffed and perked up, picking up on the smell of his own musky body. And oddly enough, Sableye was finding it appealing. One hand was being used to explore his body, and the other hand was kept up, exposing the pit so he could directly sniff the musk. 

Small moans were coming from him as he took in the earthy masculine smell that only someone like Gengar could produce. And by breathing it in more, he was becoming excited. Stroking back and forth, tracing in wide circles, Sableye was feeling up the expanse of the other pokemon’s big belly and was surprised by how good it felt. 

Sableye heard someone else’s moans and saw Quaxly groping himself in Greninja’s body. He smirked and rose from the chair, walking directly up to the distracted pokemon. Taking him by the hand, Sableye was leading Quaxly into his own home, knowing its layout well enough to get into the bedroom where he pushed Quaxly onto the bed. 

They quickly got their clothes off and Sableye climbed on top, easing his weight down on top of his friend, gently maneuvering his big body until he managed to line his ass up with the water-type’s cock. Pushing down, the two moaned out together, feeling it reaching in deep, being squeezed by the big ghost-type’s hole. 

Sableye began to ride his friend, starting out with a brisk pace, bouncing his big rump off of the other pokemon’s pelvis. The smacks of their bodies connecting were echoing throughout the bedroom, becoming louder as Quaxly collected himself, deciding to act in time with these motions. He started to thrust against these bounces, making the shaft reach even further, pressing down further on the prostate and other sensitive areas. 

Inside of him, Sableye felt the exhilaration from precum being leaked inside, bringing with it an added sense of heat and slickness that was immediately used to increase the pleasure, allowing them to move with greater ease while also going faster. 

Working together, the two took things to the next level. Sableye started to ride his friend harder, while Quaxly was thrusting his cock in harder, putting more pressure on the prostate. They were both moaning out louder, producing louder smacks between them. The gengar’s ass was being filled and spread by the greninja’s thick cock, keeping the pleasure ever rising and intense between them. 

They were slowly getting all the more used to their bodies. Quaxly was discovering that greninja’s legs were of course very strong and could be used to slam his fat cock in deep. At the same time, Sableye discovered that gengar’s hole was very talented, taking the cock with relative ease and he could do more: clenching and squeezing down on the moving shaft. 

Reaching his hands out, wrapping them around, Quaxly managed to get a grip on the gengar’s asscheeks. Feeling a rush from how big and plush they were. He gave them squeezes, rubs, and smacks, making Sableye moan and he was given a rush from these rough touches. 

Still working together, their moans were becoming all the louder. Sableye reached a hand down to stoke the much fatter cock that belonged to gengar. He kept riding the other pokemon with growing intensity. He was the first cum, shooting his load all over the greninja’s body. The purple pokemon’s hole started clenching and Quaxly raised his voice from the rush of his climax. He shot his loads into the other pokemon’s ass, giving him that rush of heat and stickiness on a whole other level. He groaned from cumming so hard, shooting with force that allowed his cum to reach its farthest point. 

“Wow, that was...” Quaxly panted when he came down from the feelings. 

“Oh, man...We definitely have to stay like this! How about a month? Think that’s too long?” Sableye asked, having a wide gengar smile on his face. 

“No, that sounds perfect,” Quaxly agreed.