Warning: This story involves scenes of oral vore, and graphic digestion. If this is not your thing then stop reading now. You have been warned!

Disclaimer: I do not own Pokemon. Pokemon is the property of Nintendo and Game Freak.

A Toxic Relationship

The feud between the Zangoose and the Seviper is as old as time itself. For generations these bitter enemies have battled one another. This battle has driven their evolution, each evolving new ways to gain the advantage or adapt to their opponents in their never ending battle for supremacy. And it is in a small forest in the Hoenn region where the next stage of this evolution is going to take place.

A Seviper slithered along the forest floor. Prey in his territory had grown scarce and it was time to look for a new hunting ground. He flicked his tongue to smell the surrounding area. He picked up the scents of many pokemon, but one scent in particular filled him with disgust; The unmistakable scent of a Zangoose. Undoubtedly having stumbled into a Zangoose's territory, he placed his senses on high alert as he continued forward. As he moved forward the scent grew stronger; He was getting closer to the source. A sudden rustle from a nearby bush caught his attention the moment before a Zangoose sprung out, claws at the ready. The Seviper's quick reflexes allowed him to move out of the way just before a claw impaled the ground where he had been. The Zangoose stared him down, the hatred evident in his eyes.

"Your kind are not welcome here." he proclaimed.

"I could sssay the sssame to you." the Seviper retorted.

"You dare lay claim to my territory?"

"It will be my territory sssoon enough."

"Over my dead body!"

"Precisssely!"

The Seviper lashed out with his massive tail blade, but the Zangoose blocked it with his claws. The Zangoose retaliated with a slash from his claws, but again the Seviper's quick reaction allowed him to pull his body just out of reach. The Zangoose didn't let up as he continued with an onslaught of fury swipes, but the Seviper managed to escape the attack with only a few minor scratches. At the end of the attack the Seviper saw his opportunity to counter attack. He took another swing with his tail blade. The Zangoose barely managed to raise his claws in time to block, but the force of the impact threw him off balance. With frightening speed, the Seviper shot forward and threw the Zangoose off his feet. Before the Zangoose could even hit the ground, the Seviper wrapped a coil around his torso and poised to strike. He bared his fangs and brought them down on the Zangoose. The Zangoose threw up his right paw in defense. He cringed in pain as sharp fangs sank into his flesh, but the cringe quickly turned into a grin as he brought out his left claw and dug it into the Seviper's scales. The Seviper howled in pain as he released his grip on the Zangoose. He backed away from the Zangoose, inspecting the damage out of the corner of his eye. It wasn't good; The wound was deep and he would bleed out if it wasn't treated soon. With extreme reluctance he took the only logical course of action; He fled.

Fortunately the Zangoose didn't seem to pursue him, likely slowed by his own injuries. The Seviper continued to flee until he couldn't pick up the Zangoose's scent anymore. Once he was certain that he was out of danger, he tested the air with his tongue, searching for a different scent. He was relieved to pick up the scent of oran berries near by. Although he detested their flavor, he couldn't deny their healing properties. With a grimace he swallowed a few of the blue berries. Within minutes the pain finally began to subside allowing him to focus more clearly on the battle he had just fought. Curse the Zangoose immune system! That bite should have clinched the battle, but instead it left him open to attack. He needed a way to gain the advantage over the Zangoose, but how? He put his mind to work, thinking of possible ways he could overpower his opponent.

Weeks passed as the Seviper waited for his wound to heal. He had spent most of his time devising a strategy to defeat the Zangoose and he finally believed he had one. With renewed confidence he entered the Zangoose's territory. This time he tried to stay out in the open as much as possible, hoping to attract the Zangoose's attention. It didn't take long for him to hear the rustling of leaves as the Zangoose attempted another surprise attack. Just like last time, the Seviper evade the attack with ease.

"It seems you're a glutton for punishment." the Zangoose mocked him.

"Thingsss will end differently thisss time." the Seviper responded.

"You're right. This time I'll finish the job!"

This time the Zangoose was the first to act, rushing the Seviper and slashing with his claw. The Seviper used his tail blade to block the slash before retaliating with a slash of his own. The Zangoose jumped back to avoid the blade. They watched each other for a few moments before the Seviper swung with his tail blade down at the Zangoose. The Zangoose quickly sidestepped the attack and quickly slammed his foot down on the Seviper's tail, pinning it down. He lifted his claw, preparing to bring it down on his trapped enemy, when the Seviper suddenly opened its mouth and expelled a putrid bile into the Zangoose's face. The Zangoose was completely caught off guard, accidentally releasing his victim as he used his claws to wipe away the bile.

"You filthy creature! It will take more than cheap tricks to defeat me!" The Zangoose shouted in disgust and rage.

In his anger he rushed forward and unleashed a flurry of fury swipes. However he was enraged and unfocused, allowing the Seviper to spot an opening in the attack. He swiftly dodged the assault and moved up behind the Zangoose before digging his fangs into the Zangoose's shoulder. The Zangoose grit his teeth in pain, but prepared to attack his vulnerable opponent. However the Seviper had learned from their previous encounter and quickly retreated to avoid retaliation.

The Zangoose was furious now. He prepared to rush the Seviper again, when suddenly a searing pain shot down his arm. He fell to one knee and clutched the bite on his shoulder.

"What... the hell?" he said between shallow breaths.

The Seviper chucked at him. "How doesss it feel to have my venom courssse through your body?"

"But.. how?" He asked in bewilderment as the pain spread to his chest. He tried to block out the pain and replay the battle in his mind, looking for how the Seviper possibly could have poisoned him. "The... bile!"

The Seviper chucked again. "It'sss called Gassstro Acid and it hasss the power to sssuppresss a pokemon'sss inate abilitiesss. In your cassse that meansss that pesssky little immune sssyssstem of yoursss.

The pain spread down the Zangoose's legs and feet. "Curse... you!" was all he could utter as he collapsed forward.

"Don't worry, my venom won't kill you, but when you sssee what I have planned for you, you'll wish it had." The Seviper said maliciously.

The Zangoose could only watch as the Seviper moved in front of him and lowered his head to the ground. The Seviper opened his mouth wide, giving the Zangoose a perfect view of his abyss of a throat. The Zangoose's eyes grew wide as he realized what the Seviper had in store for him. The Seviper began to move forward, slowly enveloping the Zangoose's head. Saliva began to soak the Zangoose's fur as his head was drawn into the Seviper's maw. The Seviper set his tongue to work, tasting and smelling his prey. He could taste the Zangoose's fear and it was delicious. The Zangoose tried to struggle, but his limbs refused to obey him as the venom continued to ravage his body. It wasn't long until the Seviper hit the Zangoose's shoulders. This would be the hardest part. The Zangoose heard a cracking sound as the Seviper unhinged his jaw to allow his mouth to expand beyond its normal limits. His jaw continued to expand as he slowly engulfed the shoulders. Meanwhile the Zangoose was forced to endure the slimy confines of the Seviper's mouth. The Seviper's breath reeked of old meat and fresh blood. The Zangoose probably would have puked if he had the strength. Once the Seviper had the shoulders in his maw, it was much easier going forward. A large lump began to form in his throat as he continued to consume the Zangoose. The Zangoose could vaguely feel as more and more of him body entered the Seviper. The powerful throat muscles coupled with his saliva slicked fur facilitating his journey down the Seviper's throat. However due to the size of the Zangoose, the Seviper was only about halfway done with his meal before the Zangoose's head brushed against his stomach opening. The Seviper was worried for a moment that the Zangoose wouldn't fit, but there was no turning back now. The Zangoose felt an extra tight ring of flesh pass across his face as he was forced further into the Seviper. The Seviper's stomach began to expand to accommodate the oversized meal. The Seviper continued forward, finally reaching the Zangoose's legs. They were much easier to consume and went down quickly. With a few more gulps, he pushed the rest of the Zangoose into his stomach. A very large bulge now took up most of the Seviper's body. It was certainly the largest meal he had ever eaten and his stomach was stretched to its limit. Still it had been the most satisfying meal he had ever eaten and was well worth the effort. He decided to take a well deserved rest as his stomach started to slowly digest its latest resident.

As the Zangoose's feet slid into the stomach, a sphincter closed behind them, removing any hope of escape. Not that it would have mattered, he was in far too much pain to resist. Each beat of his heart sent a fresh wave of agony through his body as the crushing confines of the Seviper's body assisted in squeezing the venom throughout his system. In fact the Zangoose didn't even noticed that he had stopped moving nor the fact that a strange new liquid was soaking into his fur. Even as the acids started their work of breaking down his skin, the minor itch was nothing compared to internal pain that he was feeling. Soon his fur began to fall away from his body leaving his irritated skin completely exposed to the caustic stomach juices. He was becoming increasingly aware of a burning sensation on his skin, however it was not until pieces of his skin began to fall away that true pain hit him. He would have screamed if he had the strength. He could only lay in silent horror as the acids worked to dissolve his flesh while the venom assaulted his systems. Every nerve in his body cried out in pain, turning his world into a living hell. It was almost a relief to have the blood ooze from his body, taking the vile venom with it. However this relief was short lived as the acids took over where the venom left off. He was forced to endure the digestive juices eating away at his muscles as he slowly bled out. It was a torture worse than death and a small corner of his mind begged Arceus to make it stop. After what felt like an eternity, he finally began to black out. At last he was granted the mercy of death as the last of his venom infected blood drained from his body.

The Seviper awoke from his restful slumber. The bulge in his belly had reduced slightly, but was still too large for him to maneuver. He didn't know if the Zangoose was still alive or not and at this point he didn't really care. He had discovered a way to defeat his species' most hated enemy and once he finished digesting this Zangoose, he would hunt down others, condemning them all to the same fate. At least until the next stage in Zangoose evolution...