Sheathed

Story by Virfolf on SoFurry

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#7 of Adult stories

A young Lucario tries to convince an older Arcanine that their size difference doesn't matter, what could go wrong?

Well, a lot of stretching and getting stuck in tight places ensues.

Contains sheath insertion, big knots and feral instincts among other things.

All characters are 18+.

Enjoy the story, and check the tags before reading if you're unsure if this is your thing!


"I mean... there's no way I'm gonna fit in you pal."

"Aw c'mon, you won't know before you try!"

A cheerful Lucario was kneeling in front of a sitting, fully grown Arcanine. He eyed the larger male in front of him suggestively, trying his best to persuade his doubtful companion. The Lucario was almost dwarfed by the firedog, in this position his head could only reach about halfway up the Arcanine's calf. For what he was doing this was no problem though, as the larger canine's semi-hard member was hanging low between his thighs and the Lucario could easily reach its tip with his maw. Based on the amount of drool covering the crimson-red cockhead, it had been the target of the smaller male's careful attentions for a while now.

"I'm not sure if you've noticed, but my dick's the size of your thigh, and that's JUST the shaft." The Arcanine gave his own bulging sheath a meaningful squeeze, to alert the enthusiastic Lucario to what was still hidden inside.

"Can we please just try? I'm part steel and my dad was a Ditto, I'm durable and veeery stretchy. I know I can take it!" He demonstrated his lineage by twiddling with his chest spike, which jiggled to the touch instead of being a solid, metal-like weapon.

The large Arcanine sighed and shook his head, but after a short pause, he smiled warmly and answered, "Alright, but don't say I didn't warn ya, kiddo. And I'll be as gentle as possible, don't wanna split ya in half."

"Yay! Just trust me, it's gonna be fine! There's nothing I can't take, no need to be gentle."

The young Lucario poked the cock in front of him, making it bob up and down, then bounced up with a gleeful smile. When standing upright, he could just reach the chest height of the sitting Arcanine. The older male stood up too, and the Lucario's view thus changed back to the firedog's waist and jutting member right in front of his muzzle.

"You know kiddo, if this works, I'm gonna start thinking you're made of rubber instead of anything else you claim to be." The Arcanine seemed to be eyeing the Lucario up and down, as if measuring how far up his dick would reach inside the smaller canine.

"You're the one to talk with that monster of a sheath, I bet you could fit my head in there with how much it was bulging around your knot just now!"

The Arcanine turned his gaze to his own package, as if pondering the possibility. His dick had receeded a bit from the lack of direct attention, but it was still the size of the Lucario's muzzle at the sheath's tip. The Arcanine let out a hearty chuckle.

"I'm sure you'd love to try, but I think that space is reserved just for my dick now. It'd probably feel heavenly in there though, nuzzling against the slick, squeezing confines..."

The thought made the Lucario blush. He had given the sheath a few licks to get his prize out of there, and both the taste and the scent had been much stronger and better than just the dick. Salty and sweet at the same time, delightfully musky... almost overpowering. He had heard stories of Arcanine pheromones and what they did to their prey, and he could kind of believe at least some of them. Obsessions, worshipping, paralysis... and the ones who didn't end up as their packmates seemed to be left wandering in search for other firedogs to satisfy their need for more. And some even ended up their dinner, or so he had heard. But he was sure he'd be safe with this doggy, he had so far been the epitome of gentle and loving. However, his thoughts were interrupted by a stern, amused command.

"What's with that expression, I ain't in ya yet and you're looking like you'd been fucked silly already. Quit fantasizing and go get some lube, boy!"

The Arcanine let out a deep grunt as the pointed tip of his canine member finally entered the smaller male kneeling on the mattress in front of him. As his sphincter gave way to the sudden invader, the Lucario's leg twitched and a moan escaped his muzzle. The Arcanine's body heat enveloped the smaller male, and his cock felt like a warm spear entering his insides.

"Ya alright still, kiddo?"

The Lucario was more than alright, he was lost in bliss. He had taken the tip, he was sure now he could take it all - after all, he had never met a girth his ass couldn't have gotten accustomed to. He was slightly annoyed by the older dog's distrust in the Lucario's abilities and his slow pace, and tried to get him more fired up.

"Is it in yet?"

The Arcanine growled and gave the Lucario's right asscheek a speedy smack with his paw.

"Naughty! Just tryin' to look out for ya. Well I certainly got more where that came from..."

The Arcanine pushed his hips slowly forward, still very careful not to hurt his small companion. As the Lucario's hole stretched around the steadily widening member, a small bulge begun to appear on the Lucario's otherwise slim belly. The Lucario panted and clenched slightly around the cock, getting a pleasured grunt in response. He eyed his tummy gleefully, he could almost see the outline of the firedog's cocktip through his stretching skin. In his mind, he thought the Arcanine was probably almost fully in now, and that was good. Ooh, finally he was getting something that really filled him, the dog's dick felt like the biggest toy he had ever taken.

The Arcanine paused again. "Alright little guy, I think that's about as far as I'm gonna push. Still feeling good? I know I am..."

Aww, his Arcanine companion had turned out to be a real gentle giant. But the Lucario wasn't in the mood for a slow love-making, he was hoping for something rougher. He wanted more, he needed more. In a mischievous spout, he knew just what to say. The Lucario arched his head back towards the larger canine and gave him a lustful smirk, accompanied with an answer.

"I-is it in yet?"

For a split second the older Arcanine just stared blankly at the cheeky pokemon on his dick, as if his mind was making sure he had heard correctly. The stare was soon replaced by a spark of a new fire in the canine's eyes, one the Lucario hadn't seen before. He could almost feel the heat the firedog was emitting increase as he withdrew his hips slightly, then rammed into the Lucario's behind with a loud growl and much more force than before. Before the cock had inched itself slowly deeper and deeper into the Lucario, now it gave the otherwise stretchy canine's insides no time to adjust to itself.

Oh, ohhh, OH! The lucario yelped as he felt a twinge of pain as the shaft's girth stretched him wider than ever before, and he watched the bulge in his belly grow and stretch much further than it already had. Just HOW big was this Arcanine? He writhed against the mattress and tried to accommodate the large invader, but before any panic could set in, the firedog withdrew his hips and drew a deep breath.

"Rrrrrh that felt good, that's what you get kiddo. I'd never hurt you on purpose, but don't provoke things you can't handle. My self control ain't limitless if such a cute fella keeps on begging for more."

The smaller male panted and tried to regain his composure. The dog was big, that he had to admit. Probably a bit bigger than his biggest Charizard dildo he had deep inside his closet. But... he still wanted more. He wanted a proper breeding, he wanted to see if the gentle, domestic Arcanine had a beast inside him like in the stories Lucario had heard. But what if the firedog did break and would go all feral on him, could he take it? ...of course he could, there was nothing his ass couldn't handle, the Lucario told himself and steadied his breath to speak again. Meanwhile, the firedog had turned his head to the side and was eyeing the smaller male carefully.

"Are you sure you're alright, little guy? We can stop if you don't want to anymore. You know I was not even ful-"

"I didn't know you were such a scaredycat. Fuck me properly, daddy."

The lucario had stressed the final word carefully, hoping to elicit a reaction. But wait, what was the Arcanine about to say? He wasn't even fully...? Lucario suddenly lost all opportunity to ponder that as he was roughly grabbed by the waist by two huge paws and lifted high up into the air. He was spun around 180 degrees on the cocktip so that he was now facing the much-fiercer-than before firedog. The Arcanine sat down on the mattress and stared piercingly into the Lucario's eyes.

"That... does... it." he grunted menacingly at the small Lucario in his paws, as if holding back a beastly roar. With every breath, small sparks flew out of his mouth, and with the emitted warmth, the Lucario was starting to feel like he was a meal about to be put on a spit to be roasted. But instead of sulfur or anything fire pokemon usually emitted when angry, the Lucario could only smell deep, musky, overpowering arousal. For the first time, he could feel a bit of fear rising from the back of his mind.

"Uh wait, I didn't real-"

A fast, determined shove interrupted the Lucario and he felt the Arcanine's cock pierce through his ass again and displace everything in its way towards the Lucario's belly. The large canine had dropped, no, pushed him on his cock and let out a deep howl as he hilted his catch. The Lucario felt a deep ache inside himself and stars spun across his field of view. When his vision cleared he was met with the Arcanine's gaze again, but this time there was no gentleness in his eyes, just feral, fiery lust. The enormous shaft inside him was stretching places that had never been touched before, and at this rate the Lucario wasn't sure at all if it'd be his mind or body that'd break first. Just like before, the arcanine withdrew before the Lucario had a chance to get properly adjusted, but this time he thrusted right back in.

And in.

And in.

When he looked down he could see his skin stretched out like he had a bit of a beer belly, the outline of the firedog's dick clearly visible inside him. Panic started to set in. Some of the initial shock had worn off and the dull pain had been replaced by sharp stings here and there, and the claws around his waist were also gripping on worryingly tight. The smaller canine was completely overwhelmed with all the sensations and could not do much more than yelp and whimper with each thrust. With each push, his prostrate was completely rammed and pushed aside by the intruding shaft, which sent jolts of pleasure traveling up the Lucario's spine. The Lucario was panicked enough that his own cock had withdrawn to safety into his sheath, but with each bounce, globs of pre shot out of the sheath in rhythm with the crushes of his prostrate.

The arcanine rutted mercilessly into him, growling, panting and arching his head back in pleasure. He seemed to have little regard to the smaller male's safety or well-being, the feral lust the Lucario had initiated in him had apparently displaced all rational thought.

"Ah! Ah! Pl-pl-pleeaagh!" The Lucario couldn't even get a coherent word out. What could he do? He tried to squirm and writhe in the Arcanine's grip to gain a foothold or somehow escape, but to no avail. This was way more then he had bargained for - there was no way out, no safeword to get him out of this mess. His squirming seemed to be turning the Arcanine on even more, and the pace of his rutting increased.

"N-nuhhh... hhh!" The Lucario almost screamed.

For a slight moment, that seemed to get the Arcanine's attention even though he still continued his violent thrusts. The giant firedog looked at the Lucario, deep into his eyes, but in that piercing gaze there still was no hint of reason, no restraint. However, as the Lucario's fear intensified and probably was clearly visible in his expression, the Arcanine's gaze softened for just a passing moment. It could've just been the smaller male's hopeful imagination, but the Arcanine did soon something unexpected.

He leaned in and kissed the Lucario.

At first the Lucario had no idea how to respond to the invading muzzle, but as the firedog's tongue twirled his way around the Lucario's lips, he could finally make some sense of what was happening and opened his muzzle. Despite how rough the larger dog was being, his kiss was gentle as first. His tongue felt the Lucario's own softly, then explored the inside of his muzzle. The Arcanine was panting wildly into his mouth as he kissed him, but his breath was pleasant, almost like a campfire made of dry wood. Soon the Arcanine's lust seemed to overtake his reasoning again though, and his muzzle began to envelop the smaller one in front of it. He licked both the inside and the outside of the lucario's muzzle, drenching it in warm drool, and occasionally nibbled the smaller muzzle firmly, as if tasting him. Although the action felt a bit worrying, it felt very pleasant compared to the assault the rest of the Lucario's body was facing.

Although, the tender kisses of the firedog had made the Lucario relax involuntarily, and slowly he was noticing that the thrusts didn't hurt as much anymore - they were almost starting to feel nice. Filled like never before, every single inch of the Lucario's insides was rubbed, massaged and rammed with varying degrees of force. As the Lucario found himself sinking into the Arcanine's kiss, he started to feel... good. First, his dick started to awaken again, slipping out of its sheath without the Lucario even noticing. Then, he did begin to notice how pleasure was building up in his loins in a rapid pace. Everything that the excitement of the situation, rough penetration and manhandling had bottled up inside him was now heading quickly into a tingly feeling building up around his cock and balls.

Thrust.

Thrust.

Thrust.

Ohhhhh!

"Mmmmpfhhh!"

The peak of his pleasure arrived quickly from all the stimulation, and he let out a loud, muffled moan into the Arcanine's maw. Thick spurts of seed erupted from his cock onto himself, onto his captor's belly, onto the mattress around them. His legs twitched wildly in the air and so did his sphincter around the canine cock inside it. A series of moans with lessening intensity escaped his mouth with each thrust, and soon he felt. The air was thickly filled with the Arcanine's scent, which was now spiced by a strong accent of fresh cum.

The Lucario could feel his hands-free orgasm waning, but the Arcanine showed no signs of slowing down. If all, this seemed to excite the giant firedog into a wild frenzy, and his thrusts increased in fervor and pace as the Lucario kept clenching and writhing around his cock. Soon the Lucario's pleasure turned into overstimulation as the giant shaft continued its relentless assault onto his prostrate. His mind went blank from everything he was feeling, and soon he seemed to accept his fate and what was to come as the larger canine's cocksock as his renewed struggles waned. After who knows how long, the Arcanine's thrusts became more erratic and twitchy, and the Lucario could feel something large, something HUGE prodding against his buttcheeks.

Oh no...!

"Rarrgh, ahmmm... cummghh... RAGHH!" The Arcanine roared around the smaller male's muzzle and clamped down on it with his teeth, squeezing the Lucario's maw tightly shut. The Lucario could only whimper as he felt his ass getting stretched even more by a new intruder - the knot. Oh fuck, he could only hope the Arcanine couldn't push it in, that it'd be entirely too big. He couldn't ask, he couldn't say anything, and the Arcanine seemed absolutely determined to knot his little catch. He thrust in a fast pace, grinding his knot against the unyielding entrance with little success, but then he withdrew almost halfway out and the Lucario suddenly knew what was coming.

With a loud growl and a tight grip, the Arcanine absolutely rammed the Lucario against his knot, and sure enough, it plopped inside like a basketball into a drink bottle. The small Lucario cried out in pleasure and agony as the shaft inside him lurched even further, and the knot filled every millimeter inside his lower body. He didn't even notice it himself, but another jet of seed shot out of his now almost flaccid member as the knot forced his prostrate into a new dimension. He could feel the knot swelling, pulsing as it grew even more inside of him.

Soon, his insides began to fill up and feel feel warmer and warmer as the Arcanine pumped his load into him, spurt after spurt. The firedog's last thrusts yanked and twisted the knot inside of him, but it didn't have much space to move. Soon, the still spurting Arcanine let the Lucario's muzzle out of his own, and grabbed him into a tight hug and pulled him close into his chestfur as he unloaded the last of his seed into the smaller male's belly. They both laid there panting and huffing, and the Arcanine pet the back of the Lucario's head gently as his own orgasm waned away. The Lucario whimpered softly, but he had a clear smile on his face as he steadied his breathing into the firedog's fur.

"There now, kiddo... I hope I didn't hurt ya too bad..." The Arcanine nuzzled softly into the Lucario's headfur. "You were amazing, though. Not even all pokemon twice your size can take my knot."

The lucario answered only by nuzzling into the Arcanine's chestfur and wrapping his own arms around the calmed beast.

"Eeee! Nonono, this is not going to work!"

The Arcanine ceased his pulling and let the Lucario fall back into his lap. The Lucario's eyes darted around frantically, afraid of being completely stuck.

"Well what do we do then? I'm not completely hard anymore and it's still not budging. I don't want to keep you around as a very lifelike ventriloquist doll on my lap no matter how cute it might be, little fella." The Arcanine chuckled and readied his arms for another strong tug.

"Wait, let me try propping my footpaws against your sheath and getting leverage there! I can push harder if I'm squatting! Can your sheath handle the pressure?" The Lucario feared for his ass and didn't want the firedog splitting it open any more than he already had, and.

"Hah, it'll just enjoy the experience! Okay, kiddo. I can try pulling my hips at the same time. Ready?"

"I-I think so. On your mark!"

"Three!"

"Two!"

"One!"

Pussssh!

A wet lurch and a loud yelp echoed in the room and signified that something had indeed happened. The Lucario was now standing upright, had he managed to dislodge his invader? To his great disappointment, he could still feel his ass painfully plugged by all parts of the canine member. However, his feetpaws and legs were now somewhere tight and slimy, and intensely warm.

"Wha-?"

The Arcanine stared at the sight in front of him, mesmerized. His companion was now thigh-deep lodged into his sheath, and he could feel his legs squirming deep inside, touching pleasurable places he had not known before.

"What's happening? A-am I stuck?" The Lucario tried to tug his legs free, but they didn't budge any more than the knot inside him. Now his ass was basically bound to the sheath's entrance, so he had no leverage or space to inch his legs free. The sheath's walls were coated in a thin layer of pre and lube, so they were extremely slippery and did nothing to stop his sinking. He pushed against the flesh on the bottom of the sheath with all his might, but elicited only a moan out of the Arcanine.

"A-ah don't think that's working, kiddo! And I doubt I can yank you free now that my cock's holding you in place there. Rrrh, whatever you're doing down there is makin' me blush, though."

"This is no time to enjoy this, I'm stuck inside you!" The lucario tried to push at the edge of the sheath with his hand but managed to only slide it inside too with a wet squelch. Spooked, he yanked his hand back and was slightly relieved to see that it came out effortlessly.

"Relax! Ya ain't hurting me and my sheath ain't gonna hurt ya. It ain't a mouth, it doesn't eat what's put in there. We should be able to get ya out once my cock softens enough to slip outta ya."

The Lucario considered the firedog's words and stared at him suspiciously.

"Trust me kiddo. Daddy ain't gonna let ya get hurt."

For the first time, the Lucario blushed furiously. There it was, the word he had used to provoke his companion. Based on the Arcanine's grin, he had no complaints adopting that name temporarily. He had even made sure to stress it exactly as the Lucario had. For some reason though, the way the Arcanine addressed him with gentle, reassuring words made him calm down a bit. This wasn't so bad. The knot was going to come out eventually. His legs were in a warm, pleasant sleeping bag of sorts. The Arcanine was going to pull him out as soon as he was able. He was still surrounded by pleasant smells of male arousal. They could just relax and wait. All was well.

That was, until the Arcanine actually started to go soft.

The Lucario felt a sudden yank in his butt and tried to push the slightly deflated knot out, but it still didn't budge. However, the next yank made him lose his balance and fall onto his butt into the sheath. His rear slid into the opening with little resistance as his things were so wide already, and he was now fully supported only by the cock in his ass. As he tried to regain his footing, there was another yank that pulled him even deeper. Now the Lucario was like laying in a jacuzzi, with only his shoulders, head and arms outside the sheath. He flailed his arms in a panic and shouted.

"Aah! It's pulling me in! How is this even possible, was your father a Ditto too?"

The arcanine shook his head and eyed the situation curiously and gave the Lucario his hand to grab on. The struggling canine tried to pull himself free using the hand as support, but when the Lucario pulled, the Arcanine's dick was stretched very uncomfortably and he yanked his hand free in pain. The Lucario looked at the larger male, betrayed.

"Ack, it's still too big to pull outta ya! I don't wanna rip my dick off either." The Arcanine grabbed his bulging sheath and rustled the insides around to get his comfort back, making the Lucario sink a bit deeper in the process. It seemed the additional mass and weight inside didn't feel unpleasant to him at all, on the contrary. The hand around the confines that were holding the Lucario in place was giving him a good rubbing in the process, though, and he also had to admit if felt kind of good.

The Arcanine groaned as he rubbed his package. "Hhh, I had no idea putting someone in there would feel this good..."

"H-hey, don't go getting another erection or we're gonna be stuck here forever!"

"Hehe, don't worry kiddo. At my age ya ain't getting a stiffy after ya came, that's just a fact of nature. Oooh, please move your leg just like that in there..."

"D-don't get distracted, this is still an emergency!"

"Nahh, this is just a silly happenstance and you ain't in no danger at all! Let daddy keep you safe..."

The Lucario frowned and tried to struggle against the squeezing, fleshy walls of the sheath to keep his head and hands outside, even with the constant tugging underneath and the rustling of the Arcanine's fingers around him. He could feel the shaft inside him getting smaller and smaller, but the knot itself showed no signs of shrinking. Still, with a particularly strong squirm that elicited a pleasured groan from the firedog above, he could feel his ass giving a bit of leeway to the knot. It might be finally going to finally get free.

"Hhey, I think it's lettin-"

"Uhhh, I'm sorry kiddo, but on second thought, I don't think I'm gonna let you get free just yet." The Arcanine declared, grabbed the Lucario's snout and pushed it forcefully inside his sheath.

"Mmpfh!" was the only complaint the Lucario managed to get out before he was silenced by the tight, musky confines of the larger male's pouch. The scent of arousal had been strong on the outside, but inside it was completely overbearing. It coated the Lucario's sensitive nose in a endless sea of pheromones and lust, and was disrupting his thoughts. He couldn't think straight, he couldn't hear anything except the pulsing of the flesh around him and a distant heartbeat, he couldn't see anything. All he could do was to whimper and squirm against the slick prison he was in.

The Arcanine let his tongue loll out in pleasure as the Lucario squirmed and whined inside his sheath. There was little regret on his face, only deep, deep pleasure and the feral glint in his eyes had returned. Now he was a predator again, having captured his prey and keeping it at his mercy. His prey was still dear to him, but his instincts made sure he took advantage of the situation and got all pleasure out of his new toy. And the prey will have no complaints soon, his natural assets would take care of that. He'd let him out of course... some day.

After a while of struggling, the trapped Lucario could finally feel the knot leaving his body with a loud, squelchy pop. With the knot, out came a flood of clean cum the Arcanine had left inside him. Warm, slick, sticky liquid covered the insides of the sheath and the Lucario completely, and made it even harder for the smaller canine to even feel which way around he was anymore. The tightly squeezing sheath and the rest of the shaft inside him made him stay upright, though, but after the cock had receded enough, the Lucario would have no way of knowing which way was out. The constant massage didn't helpany either, no matter how good it felt.

And boy, did it feel good.

Slowly, the Lucario began to cease his struggles. There was no danger, he could still breathe, and he was inside his trusted companion - his daddy. The pheromones were making his head spin, and pleasure it gave began to overtake all rational thought. He could kind of hear the Arcanine say something outside his chamber, but it was of no concern to him anymore. Maybe he was complimenting him on what a good boy he had been? That thought gave the Lucario great pleasure for some reason. Yes, it was good to obey his daddy, make him feel good. It was good to be inside him, make him moan and purr with every movement.

He could feel the sheath squeeze him occasionally, but he wasn't sure if it was the inner muscles or the hand of the Arcanine anymore. All he knew that it felt right. Suddenly there was a rush of movement in which the Lucario lost all sense of orientation and the rest of the shaft that had been inside him plopped out, now squeezing him even tighter against the fleshy, stretchy walls. With it blurted out another flood of fresh cum, drenching the Lucario even further. Somehow, it felt like a good idea to lick it. Yes, keep daddy clean and get some of that delicious, salty liquid.

The lucario got to work, licking anything he could reach and eliciting clear moans out of his daddy. He was doing good, and the taste was out of this world. Sweet, salty and a little bit spicy. Lucario couldn't get enough of it. He could feel himself get hard again, his arousal pressing against the flaccid member he was stuck against.

His licks seemed to arouse his daddy enough that the tight confines he was in began filling up with more liquid. It was just as tasty as the cum before, only a bit milder in flavor. It started to accumulate into the chamber and fill it up. What should have worried the Lucario made him only get more excited - more delicious fluids to drink down! As the level of the liquid reached his head, he began to drink it with vigor, even though it seemed to be making his mind even foggier.

No extra thoughts. Just joy... just pleasure.