Tentacle transformation. It feels like an oldie, but a goodie. Or perhaps I’m thinking of good old fashioned hentai? Tentacles either way. Long, sleek, flexible, they can go in many places. Of course you can stick them in sexes, but small ones in the ears and do a little rewiring while others keep the victim trapped…it’s quite a power to have! Of course one fatal flaw is if you grow tentacles yourself, they might have a mind of their own.
Or a little…influence.

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A cat anthro stepped outside a convenience store at eleven at night with an onigiri  in hand. He had never been to this store, yet after a long day of work, he had to eat something. Unfortunately at this time of night, there were only so many sandwiches. Here he held onto a sandwich made from, what the man said, the cat anthro thought meant a squid rice ball though, as he took a bite out of it, his smile curled downward. “Ugh. Disgusting.” He took another bite, then another. His small frame growled hungrily with desire. Yes it was bad, but it was rice and fish, it couldn’t be THAT bad.

One long train ride and small candy snack later, the dark colored cat anthro stepped inside his home and immediately felt a sharp stabbing pain. Strangely, when it came to bad food he would have expected this to come from his gut, yet this came from his tongue. He didn’t recall any of the food he had eaten being particularly sharp in any real way. It was as if he had a long paper cut along the top of his red tongue. He casually walked into the bathroom, opened his mouth and went ‘Ah’, showing his sharp cat teeth and big red wet thing sticking right out from his maw. ‘I don’t see any redness…I also don’t see any bleeding.’ The pain remained, though it had gone from sharp and stabbing to bearable, only causing minor pain with throbbing. Curiously, he put his fingers on his tongue and slid across it, yet there was no difference with what he did. He swore it was longer, but then again he never really spent this long amount of time analyzing that thing in his maw. He closed his lips, shrugged, and a hand wash later, went about the rest of his night preparing for bed.

Despite dismissing the strange sensation in his mouth, he smacked his lips and shifted his tongue around inside of him repeatedly, though things returned to normal once he went to bed that night. He could only presume things would return to normal tomorrow. Whatever was going on inside of him often resolved itself after a good night’s sleep.
*Sleep well. It will be the last peaceful one you have for a long time.*

Things went well for the college cat anthro upon waking up. Just as he suspected, whatever sensation was…he didn’t even remember ‘where’ the bizarre feeling came from. “It’ll be a long time before I have food from that store again.” He told himself with a smile as he went about his morning routine. He ate breakfast and then proceeded to brush his teeth, pausing only momentarily to glance at his tongue. He swore that thing wasn’t purple before, and he definitely knew it wasn’t nearly as round. Tongues were usually long and flat, not purple and circular…yet once he closed his mouth, he blinked a few times. “What was I worried about again?” He mentally shrugged. Whatever it was, it couldn’t be important if he forgot about it so quickly. He brushed his teeth without a second thought! The only regret he had on his mind was that, despite having a day off, the cat anthro still had work to deal with. As he left the bathroom, he swore that appendage brushed itself along his inner cheeks, his teeth, and his lips in a vain attempt to part them and see the world once more, yet he blamed his subconscious on the thing. More bizarre yet was that feeling himself up inside of his maw felt… good. Not only was his appendage on the other side of his lips pulsing, but so too was something between his legs.

If it weren’t for the strange sensation in his maw, this cat anthro would have had a perfectly normal day. In fact, some might call it dull. Each time his mind drifted, however briefly to that thing behind his lips, it was quickly dismissed. Sure the sensations inside of him were… greater than before, in fact, if he brushed his tongue just right, it would be nearly orgasmic, yet at the same time.

Luna’s phone suddenly went off, causing the cat to jump from his chair he had sat down upon. As he looked at his phone, and then at the screen, he quickly realized that he had done absolutely nothing over the past hour! “Beh! I have to focus on my research. Work wants this done by monday.” He buried his head as he stared at the blank screen in front of him, though time and time again that thing kept distracting him. Unable to help himself any longer, he opened his maw and stuck out his tongue. He glanced down, able to see the purple colored tip much easier than he ever could have before. Undoubtedly, that appendage had transformed into something bizarre, and as it was free from his mouth, it thrashed around with seemingly no rhyme or reason, and he swore he wasn’t telling it to. Part of him told his mind that’s just how tongues behaved, that it was merely a natural reaction for such a thing to do that. He closed his lips and pulled that thing back in, noting that it stopped moving inside of his mouth unless he instructed it to do so.

“That does it.” He paused work for now and opened up another web browser. One website hop later, and he was asking an AI about what might explain his bizarre feelings. “My tongue is turning purple and like…almost into a tentacle?” He was unsure how else to phrase such a bizarre change. “What could it be?”

After a delayed response, he got the answer he was asking about. 
“If someone's tongue were turnin' all purple and tentacle-like, I'd say they're just spinning' a yarn or playing' a prank! In the real world, tongues don't just up and change like that. They stay the way they are. So, I reckon you're probably just imagining' things! Tongues changing' into tentacles? That's as likely as a parasprite learning to sing! Just a bit of fantastical fun, nothing to worry your pretty little head over!”

Luna stared blankly at the response. His furry paws rested on the keyboard in front of the glowing screen. After a moment, he murmured. “Curse the personality I gave this AI.”

With the AI being of little aid and an internet search turning up nothing, Luna pointed his attention right back to getting work done. If the internet knew nothing, and the AI especially was not helpful, then surely it was his imagination playing pranks. He managed to type up some words, and soon his focus was gone from inside of his mouth and put into his job, making sure to get things done to make that boss happy! His tongue began to move around inside of his mouth, and with little input on his end, but he simply dismissed it as his brain toying with him.

Luna’s mind went blank as he kept working at the computer. It took him a moment before he realized that tongue was stroking his cheeks from the inside slowly, sensually, and he knew he wasn’t controlling it! He was ready to open his mouth to speak, yet that would allow the thing inside of him to escape. The strange thing that was so…different. He wasn’t sure if he could even call it a tongue at this point. His eyes glazed over the words of the paper he had written for his boss, and how many times he repeated the same word so much. While his pupils were busy, his mind paid attention to the thing still stroking his cheek. Normal appendages in a mouth had smaller tip, but not as small as the one he felt. He recalled the time he had tried deep fried octopus tentacles on a stick, a single fried octopus tentacle with all of those suckers. The taste was interesting enough, yet it was so long and slick, almost just like the thing inside of him. ‘Just remember the meme. You’re focusing too much on the inside of your mouth. Therefore, you can’t find a comfortable place to put it, no matter how hard you try.’ 

Just then, Luna began to feel a growing pressure inside of him, a sensation he had often experienced in his own crotch, beyond his very lips. He pulled himself up out of his chair and excused himself to the bathroom. The cat anthro raced inside, covering his mouth before SLAM and locking the door with a click. With his heart pounding out of his chest he raced to the mirror and opened those lips, allowing that thing to escape once more, a thing that was far from the tongue he once had, and had since changed into something else.

Like before, his tongue was purple. At this point, he had come to expect it to be such a bizarre color, though it was the rest of it which surprised him so much. No longer was his tongue flat with a wide tip, but now it was round with a very tiny tip, just like that of a tentacle would be, the same one he swore he had eaten earlier. He reached up and stroked it with two fingers, shuddering at the slick wet sensations that it provided and watched, no… felt it pulsing softly in his maw as if it were something far, far greater than what it once were.

The cat couldn’t help himself. The harder it pulsed and throbbed, the cloudier his mind got. He had experienced this feeling before, but only at night with himself, and some ‘interesting’ reading material, sometimes made by Myu and posted on Patreon, which he absolutely supported.
*If product placement is wrong, I don’t wanna be right.*

He stuck that tentacle out and stroked it slowly with his paw. He began to close his eyes and envision himself thrusting in and out of…a face of all things, using that tongue of his, treating the face he was merely kissing and slipping in tongue as if it were a sexual hole all on its own. He moved not his hips up and down, but his head began to move back and forth. He sealed his lips around the tip of that co- er, the tongue as he imagined using it not just on the mouth of a person, but their various…other ways. His mind screamed at him, reminding him that he was hardly such a perverted being, but the fog masked the noise. No, whatever was going on, it felt too good to stop, and there was a pressure growing and growing. Something was going to happen, and he lacked the willpower to release his tongue from his grip. He tasted his hand, but it mattered not. All he cared about was satisfying this lust.

Only moments after he revealed that new thing and stroked it continuously, a sudden white liquid formed at the tip of the new appendage, something that looked so familiar. He was reminded of glue bottles, and how one single white dollop would escape from it if you squeezed it just hard enough, yet he had hardly touched this thing! He let go fearing the worst for that thing. He closed his lips, but his ‘tongue’ stayed on the outside of his maw, wriggling and writhing with that white dollop of something. It had a sweet taste to it which, unfortunately, Luna still possessed such senses on the thing. His mind ran wild with what the heck was going on with this! Yet, his paws kept stroking, faster and faster until…
Splurt. Splut. More than just a dollop of that white seed, but large spurts of it shot out from that hole in his tongue all in front of him. He closed his eyes just as his ears rang from the pleasure. This felt…it felt just like he were experiencing his first orgasm once again! There was no other way to compare it, it was so pleasurable, so arousing, so good that he unleashed his seed, but it was from a hole that should be far from capable of cumming!

One long mess and mind blowing event later, almost literal for that, Luna pulled himself back up and glanced back at his face. The thing that unleashed the white fluid, something that he once called a ‘tongue’ but now could be nothing far from it, slunk back inside of his mouth, as if satisfied from the relief, yet it continued to dribble a fluid that the cat could taste both outside, and inside the very thing in his maw.

Luna slumped back and lowered his head. The thing went back inside of his mouth, but the sensations were still so pleasurable, so amazing. He almost wanted to stroke that thing again to orgasm and… he pondered if he could even call that an orgasm? His cock was rock hard as if it begged for attention, yearning to be stroked over the thing that he was already treating so well. He still hadn’t figured out what to do! He feared opening his mouth to speak purely because of what might come out and freak out a person. In truth, though he knew his tongue was a strange cylinder tentacle like shape with a tip, he barely paid much attention to the feel and looks outside of slick and purplish. ‘If I’m going to go to the doctor I’m…actually…I don’t want to go to the doctor for this. Doctors are scary.’ The question however, lingered…
What was he going to do next?

Luna tried to go back to work and do his daily business as per usual. With the sudden strange tentacle orgasm finished, he found it both easier and harder to focus. It was easier to think because there was no strange bizarre pulsing and throbbing sensations in his mouth, nothing to pay attention to. Sure, he felt the thing brush up against his inner cheeks slowly and poke from behind his lips, as if teasing him. The cat told himself that it was his mind playing tricks on him. At the same time however, focusing was also hard due to the event that just transpired. Who the hell orgasms from their tongue that transformed into a purple tentacle thing? He envisioned it in his head, though he couldn’t stop picturing bumps along it. He swore they weren’t there before, but since he didn’t want to note every detail of the thing down inside of him, he simply concluded whatever he thought of what it appeared to be, was not normal regardless.

After a work day that was much too long, the cat finally called it a day. He picked up the phone to make a doctor’s appointment, but the moment he did, he paused. “Wait…why was I calling them again?” He felt a thing stroking inside of his mouth, as if to serve as a reminder of some sort, yet every time his furry finger approached a digit, he hesitated to actually follow through with pressing a button. With a shrug, he decided against visiting the doctor. The hospital was a cold cruel place and he had no reason to see them! As he thought about what he should be doing, his stomach let out a soft growl. One thing he hadn’t done with this new thing was actually eat! He wondered how his new appendage might take water, let alone food, but again, the thought was quick to subside. Yes, he can eat food just fine. Why should he be worried? Why was he worried at all for that matter?

One quick look around for food, and the cat figured he should eat something different. He briefly thought about the food he got from before, but decided against it. It wasn’t that there was anything wrong with the food as his appendage inside of his maw  brushed against the lower part of his mouth, it was more that the food itself left an…unpleasant thought in his head, he just wished he could remember what in particular that was. It was as if a bad memory had been suppressed. He knew it resulted in something that wasn’t good, just… whatever it was didn’t come straight to his mind.

Luna decided on a simple sandwich with some chips for dinner. At home, he made his sandwich, grabbed his food, and sat down at the small table before eating. He let his tongue brush over the food as he tasted it. While he had this food several times before, so much that it was almost boring to talk about and describe, the sensations along the inside of his mouth was…different, as if it didn’t taste quite right. The food wasn’t unpleasant, but it was hardly appetizing as it once was.

To this cat, things just didn’t feel… exciting enough. He finished his food and yet his mouth still wanted, craved for more. Oddly, he wasn’t quite hungry, but his tongue craved something. Worse yet, he was still so… strangely horny. He remembered the appendage in his maw coming to what felt like an orgasm, yet despite that, he was still so uncontrollably aroused. “Maybe that’s what’s wrong.” He said, dismissing anything else possibly being off. Speaking didn’t feel quite right as something flopped around inside of him, though any sense of why that was unusual never struck him, as if nearly completing a puzzle but still not quite able to identify what the picture was.

Unable to help himself at his own home, Luna changed the content onto his laptop to something more entertaining, complete with various pictures of nudity, and a few pornography stories. He wasn’t getting into specifics about what he wanted, he figured something, anything to just…rub one off would set his mind straight. As he reached down to stroke himself, he suddenly got a strange idea, as if it came out of nowhere. ‘My tongue has a hole. Doesn’t this mean that I can put things into it? How would that even feel?’ 

No, it wasn’t the time to think. Thinking was…challenging. Each time his mind wandered into complex territory, it went back to needing to satisfy himself. Despite having more than a few tabs open on his computer of various kinds of pornography, including stories made by Myu who had a wonderful patreon for support and was even designing games, it just wasn’t enough.
*More product placement brought to you by RAID.*

Luna parted his lips and let his dark purple tongue slither out. His eyes went cross as he saw the appendage, much longer than he recalled, especially since most people couldn’t see their tongue that well at all when trying!
*Go on. Try being part of the tongue challenge.*
Thankfully being part cat came with a perk of being extremely flexible. He spread his legs and took a deep breath. He closed his eyes and moved his head right down to his crotch, right to where his erect shaft was. ‘Why am I even doing this? Why not the butt? There’s a g-spot in the butt. Why would god put g-spots in our buttholes if he didn’t want us to put things up there?’ Then again, while Luna was undoubtedly flexible, he likely wasn’t that flexible! 

Despite having his eyes closed, his tongue knew just what to do. His tongue shifted and wriggled about, feeling the thing down between his legs. Not having any thoughts about what was going on was easy, though the sensations of his own tongue stroking, no, tasting himself were unusual despite the pleasure that ran from his mouth, all the way to the thing he was stroking.

Then, it happened. Luna’s eyelids suddenly shot open as a sharp pain ran through his maw. He saw his tongue jutted outwards, right to his cock, and had in fact put his own shaft inside of his tongue! He wasn’t just sucking himself off, his tongue with its new hole had inserted his dick inside of it! Just as soon as the pain came, it subsided and was replaced with pleasure. The inside of that thing in his mouth, that appendage that he kept referring to as a tongue but had undoubtedly changed into something else, something… better, had slick inner walls that pulsed and throbbed perfectly in sync with his cock, making it the perfect thing to give himself his own blowjob, even if those lips of his were wide open. Luna’s ears rang, and as his eyes looked down at his crotch, he knew what was happening, but he wasn’t able to focus on seeing what was going on despite looking right at it.

The cat’s big furry paws reached down and touched it as his senses slowly returned to him. The pleasure was immense, but just enough to keep him from just orgasm. His fingers wrapped around his shaft and the thing that his shaft was inside of. He attempted to pull it off, only to find his fingers slipped from the wet slick appendage. “Mmmphh!” His head ran wild with thoughts of needing to call for help and how people might react. Yes his body was…nothing worrisome, but being stuck in a position like this, this was downright humiliating! His cheeks turned red underneath his fur as he tried pulling up, only to find his tongue firmly stuck around his cock. He pulled up, only to find himself forced back down. There was another small squirt of liquid from the inside of his tongue, something that surrounded the cock that it contained. ‘I have to get out of this!’ He pulled again and again. Each time he pulled his head upwards, he sensed himself moving more and more away from his sex into a more natural position, though his tongue still wrapped itself so keenly around his sex.

With one last massive tug and a pop the tongue finally freed itself and slipped itself into Luna’s mouth. He quickly shut his lips and looked down to see his cock had transformed while it was inside of his appendage. He knew it had felt a little different inside of it, but now as he saw it, his shaft was now…oddly shiny and resembled the very same thing that was in his mouth. While he knew not to worry about his tongue, he was pretty sure that a cock should not resemble a tongue in the slightest way! Moreover his shaft had grown outwards so much during the time he was pulling, out to a whole two feet in length. The shaft pulsed and throbbed as it rested against Luna’s belly. He feared reaching down to touch it, but he knew he should have. “This…this isn’t normal.” Sure, something inside of him kept telling him there was nothing to worry about, but his eyes overrode that nagging sensation telling him nothing was wrong. No, something was very much wrong.

That tentacle between his legs, a thing that was once his own cock, moved around slowly with nimbleness and dexterity that no shaft would normally have on its own. It stroked his chest before moving down to his thighs, softly caressing his fur. The fact it was his own sex feeling himself up sent him more pleasurable sensations, causing him to momentarily toss his head back and shiver. Meanwhile, his mind continuously told him nothing was wrong. If there was something off, he shouldn’t be feeling this much pleasure!

Luna’s mind ran wild with what to do. The thought of biting down on that new tentacle, the new prehensile penis occurred to him, but this was something still part of his body, just…a changed part. Who wouldn’t want a massive cock? It was a dream for so many to have.
*There’s always a catch when it’s erect though…I know from experience.*

What especially didn’t help was a growing pressure Luna felt between his legs, as if approaching an orgasm. He could only imagine the mess that this thing would make. Surprisingly, while his shaft grew to an amazing two feet in length, that was the only part of his sex that swelled in size, and it seemed to be looking for something as it slithered about as much as it could attached to Luna.

Then…it seemed to spot something. As it curled around, turning behind Luna, it ‘spotted’ Luna’s rear, a sensation he felt his cock both pushing up against his ass, and that very rear stretching slowly. “H-hey!” Luna reached down to grab his shaft, but before he had the opportunity, a light jolt went through his head causing him to freeze with his open palms mere inches away from grabbing his new tentacle sex.

The slick tentacle cock that went behind Luna, right to his rear, pushed itself inwards, wriggling inside Luna’s behind, stretching him little by little. Luna’s toes curled and his teeth clenched. His new sex was literally fucking himself. He felt free reign to move his hands again, yet his body was paralyzed with pleasure. He could only look down between his legs, watching his cock push aside his balls as it nestled comfortably inside of his own rear, before it suddenly began to move back and forth in him. “Ahn…hrrnn…” He tossed himself back, falling onto his bed as he wriggled and writhed around at the sensations of both fucking, and being fucked at the exact same time.

Each attempt at grabbing the tentacle self-fucking his ass proved worthless. Any time he managed to touch it, his fingers slipped from the slick grasp of that shaft. His cock pulsed and pumped so eagerly, so wildly with a life of its own as it continued to thrust into his ass. The pressure grew and grew from inside of him, a familiar one that his tongue had felt what seemed like ages ago, a pressure that was so good that he had to relieve himself of, yet if he did, it was clear exactly where he’d be cumming, and he couldn’t do that!

Yet, each thrust of his shaft brought another wave of pleasure that went from the tip of his cock, to his waist, all the way to his head that was telling him he should just… enjoy it. There was no harm in this despite how odd it was, and the feeling of fucking himself, a sensation that should have been impossible, was something he was doing right then, right there, and it was moving deeper and deeper inside of his rear. He briefly recalled what he had thought about earlier. Why would god put a g-spot in his ass? A spot he sensed himself approaching little by little, his new tentacle appendage seemingly encouraged by that thought alone to thrust itself in harder, with one more deep push inside of him until…

Large bulges began to appear at the base of his new shaft, the cock literally fucking himself, sending himself into so much pleasure that standing proved nigh impossible. These bulges flowed through his shaft one at a time, slowly spreading his thighs as they made their way through. He closed his eyes and gripped his bed as his ears rang. His ass slowly spread as something pushed its way into his ass from his shaft. Unable to help himself, he let out soft moans as his balls emptied with something that filled his own rear, giving him pain from that ass spreading, but so, so much joy. ‘I have to…get my cock out…but..whatever these are…ahn…so…good.’ He parted his lips, the tongue inside of his mouth stuck out just enough to unleash another spurt of white seed, covering his maw with more of that sticky stuff.

Luna’s hands shook as they moved to his stomach. On the bed, he thrashed about as his shaft continued to pulse and cum deep into his ass. Each pulse, every pump, a large ‘seed’ emerged from the base of his cock and flowed across his thighs before pushing itself into his rear. He could feel his stomach churning as it grew with each thing that went inside of him. Something in his head, something far from his head, told him the truth. He wasn’t just fucking himself, he was impregnating himself with something too. Yes, a huge breeder machine. He had little idea why his tongue was capable of orgasming, but no… there was no need to worry about that. He had been repeatedly told to ignore the thing in his mouth, and now it was more than easy enough knowing what was going on between his legs.

As Luna clutched onto his furry belly, he raised his head to watch it. The sensations of him fucking himself were still there, sending him through so much pleasure that it made focus nearly impossible, yet he put his eyes on his slightly chubby belly. As he breathed in, he watched that belly grow, and then he exhaled and saw it deflate, although it never deflated back down to its original size. He tried to ‘pull’ his stomach back into him in a way one might try to make themselves appear thinner, only for a sharp pain and a sensation of fullness to prevent him from doing just that. Every time he exhaled, he noticed his stomach growing just a little bit more.

After some time, there finally came that point when his shaft stopped, a point where his orgasm finally finished and his shaft retracted, pulling free from his ass and withdrawing back to a normalish size, going back to the same size his cock was before, but maintaining the appearance of that tentacle from before, but Luna didn’t care. His belly was so swollen he looked as if he were nine months pregnant. He faintly heard the sound of clacking inside of him, knowing full well what had been inserted into him. He should be panicking, calling someone, doing something despite how heavy he was, yet he felt…warm inside, it was a good sensation. He stroked his huge belly as an urge to…protect these things grew inside of him. Yes, he would protect whatever came out of these eggs when they emerged from his body, however they chose to do so.
Now, he had one thing on his mind…
‘What else can these tentacles do?’
