The snake was huge, from an ancient line of the forest's guardians. Known as Acrafada, he resided deep in the forest in a den formed from a natural cave enlarged by piling fallen trees and other scrap to form an extension tunnel before the it. His time was mostly spent sunning himself or resting inside the den, now and then hunting for his meal. His size meant that small animals were rather safe from him, unless he accidentaly slithered over them, but otherwise even bears ended up as a bulge in his belly, save for few notable exceptions.

It was one of these exceptions that made this day particularly memorable. It was late morning. Normally no fox would walk at the clearing his den opened to, even simple animals knowing better than that. But this fox walked straight towards him, even though his head was clearly visible from under the dead branches partially covering his den's entrance. That alone made him suspect the fox wasn't a normal if a rather large individual, yet it wasn't until the fox bounced up on its hind feet, its form shifting slightly and smoothly enough that he at first wasn't certain whether the fox really changed at all, that he knew for certain they weren't a mere animal.

"Greetingss Karess" he welcomed the fox, for he knew the now clearly male canid. Whether Kares was a guardian like him, a spirit manifested as a fox or something else, he knew not. The fox was always on the move, rarely talked about himself and even less often about his role in the forest. Indeed, Acrafada suspected that the fox didn't really have one. Still, he wasn't aware of any real harm done by Kares, so the fox was welcome to visit him.

"Greetings o' hungry one" Kares greeted him, the rather casual way of calling him annoying Acrafada slightly. The fox never behaved properly.

"What bringss you here?" Acrafada asked the canid, eyeing the fox suspiciously. Harmless as such though the fox had always been, he was still an unknown quantity.

"I were nearby and thought I would pay you a visit" Kares answered, coming and casually leaning against the top of his snout.

Not only was the fox touching him and closer than was courteous in general, the white furred sheath of the canid was now almost against his nostrils. The fox wasn't erect, but the smell of musk told Acrafada that the fox either was exited right now, or had been recently. "I thank you for remembering me" he replied. "Yet I am actually quite hungry right now, and was intending to go for a hunt" he went on. It was a slight lie, for he wasn't really hungry, yet had thought to possibly hunt later that day if the weather warmed.

"Oh" Kares seemed taken a'back, though only for an eye blink. "That's okay, I can wait" the fox decided, moving to lean against the pole of one of the trees making up his cave's extension.

Unable to come up with an argument against that, Acrafada could only rise his head for a nod, starting to slither out of the den. He was half out when the fox called "This structure isn't very sturdy looking, is it?"

Looking back, Acrafada replied "It can hold my weight on it."

"Really? Could you show me before you go?" Kares asked, moving out at the den's entrance.

Again feeling like he had no choice but to do so, since he had made the claim himself, Acrafada started to do so. He lifted his head off the ground and on the structure, coiled his rear half to push most of his front on top, pulled his middle on top with the help of his tail, and was pulling his tail up when the fox made his move.

Fast as a lightning and showing more strength than Acrafada would have believed the vulpine to have in his small body, the fox pounced on his tail, caught hold on the edge of a scute, and... "What? Stop! Kares!" Acrafada called in surprise as the fox took hold of the edge of his anal plate, pulled it upwards to reveal his cloaca... and Acrafada was barely in time to bring his head over the edge to watch the canid squirm his way inside.

Forget about inappropriate behaviour. Kares had gone completely mad, that must have been it. Acrafada could only watch in horror as a bulge moved just inside his vent, moving towards the tip of the tail... And then he would have blushed, had he been able to. The fox was crawling over his hemipenes. The fox was, by what he felt, licking his hemipenes. The fox was, quite likely, humping against his hemipenes.

Most of the sensitive nerves on his twin shafts were now hidden inside them, inverted inside out as they were now inside him. So while he felt what the fox was doing, he wasn't being stimulated quite as much as one might have thought. That is, until the fox made his way towards the tip of his right side penis and seemed to push his hand... would that be push it on the outside of it? Which ever it was, the hand was brushing against the spines, pushing against the nubs, triggering the nerves...

Shuddering, unable to speak, Acrafada could only will his cloaca open and push his tongue inside, reaching for the fox. He had meant to try and pull the vulpine out, but now... It felt good... His tongue instead moved along his penis, curling to caress the fox's balls and very erect cock, knot fully engorged, the fox's own hand pumping furioussly...

Inside Kares had just managed to move his head up to the tip, the tight confiness forcing his muzzle inside it, breathing in the unadulterated musk of the snake. They both came at the same time, Kares's meager load lost in Acrafada's as the subcaudal pocket filled with snake cum.

It took a moment for Acrafada to catch his breath. Engulfed in his pleasure, it didn't even occur to him to worry about the crazy fox, who emerged from the vent sputtering and coughing. It had been years since he had last gotten off, giant snake's being in short supply in these parts. There might have been alternatives, but so far he had at the very least assumed he'd need something large enough to fit inside, even if it wasn't a compatible species.

But for now, his right testicle had emptied fully, it seemed. The left one though, connected to his left side hemipenis... "Kares, I would like an explanation for your behaviour" the snake started. "But before that..." he went on, forcing his anal plate back down and locking the fox inside. Kares seemed to know what was expected of him.



Inspired by this image http://www.furaffinity.net/view/28129912/ via a thought chain about other animals with "internal sheaths." The fox is the same male one from this sketch http://www.furaffinity.net/view/27440307/ though in a bit more refined form. He and the female are likely to be seen again.

I tried to research the actual way snake's junk is arranged inside them, but aside from the fact that it rolls back in to an inside out form the details came out as confusing and even contradictory. It might be possible that it isn't actually even possible to get to the tail pocket past the hemipenes, that the only way in would be to enter through one penis or another. Yet some sources seem to point to there being a possibility for just that. So, lacking certainty, I prefer to think of the pocket being accessible.

And hey, this isn't meant as a scientific study anyway, even if I'd like it to double as one if possible.

Sketch in pencil, coloured in Gimp 2, total time about 12 hours or so.

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