Moonbounce had one shot at this. The mare closed her eyes, concentrating hard. As soon as she felt the throat ripple she flapped both wings hard as her hooves shoved in unison. Her soft hooves pushed against the slippery and smooth surface, pressing against the ridges and launching herself forward. The snake jaw tried to tighten, but it was fighting the powerful motion as the mare hurtled back, freeing herself with a pop and then... *THUMP* Moon had failed to take into account the very solid wooden headboard at the top of the bed, and it was all too happy to catch her attempted escape.
"Nice try, ssslippery one," the snake tailed mare hissed with a smirk. Moonbounce's head was swimming, the thestral's vision gone quite blurry thanks to the vicious hit on the head. She struggled to make out anything, but she could feel the wetness on her hooves again. She knew what was happening. Her hooves kicked weakly, pushing back against the serpent throat as it advanced up her once more, her delicate hooves squished against the snake's tongue, before a gulp pulled them into the throat. The saliva hadn't even dried on her ankles before it was replaced, the pair of green jaws sinking softly to grip her in place. "Almossst a ssshame... with a body like yoursss you might have got an officer'sss attention," the mare repeated with a grin.
"S-stop..." the thestral moaned weakly, her head still spinning as she shook it repeatedly, trying to focus on the shape in front of her, the form of the mare's flanks slowly coalescing. From the blurs of movement it seemed almost like her mane was alive too, the thick strands of hair curling and coiling. She could feel the snake advancing up her, another slip and it was at her thighs, the slightly rounded and tasty chunks of meat seeming to make that tail maw salivate harder, thick drool smearing over Moonbounce's fur as the jaws opened again and slipped up higher.
The curving of the cadet's bouncy moons strained the snake jaw, it visibly dislocating as it pushed up, stretching wider and wider. "Ooh, you really are a tasssty little thing," the mare teased as Moon's flanks were encompassed, sitting on the tongue a moment as the forked tip caressed her sphincter and marehood, making her moan lewdly for a second along with a loud slurp... and then another gulp as she was pulled back over her rear in her entirety. Her eyes seemed to finally stop spinning, only to focus on the brand new snakeskin skirt she was wearing all the way up to her waist.
"H-helllllp!" screamed the cadet, which only earned a sybiliant laugh from the snake mare, her tail gulping again as those leathery wings were pressed against her back, the snake sliding up a little higher, stretching around her chest and squeezing her shoulders together. All Moon could do wa sshake her whole body, wriggling inside the snake like a skin tight bodysuit, the clear indentations of her compacted body showing with each wriggle and push as she tried to resist. Another slurp and the saliva was at her neck, her vision growing darker as the shape of the snake jaw pushed over her.
Inside it was moist and warm, the muggy breath of the tail serpent just like that of a real snake as it's forked tongue circled around her muzzle. Tears stained Moon's eyes as they got that last view of freedom, though framed by the image of those sharp fangs above. A whimper escaped as she realised this would be it, and then the snake slipped upwards. All became pink as the snake slid over her, and then black as its jaws shut together, sealing her inside its length.
The mare sighed as she lifted up her now massive tail, it having stretched entirely over the mare and become a thestral sized and thestral shaped length of green, before it gulped again. The insides of it rippled, the entire thing one long throat that was intent on pulling as Moon felt herself dragged a few inches deeper, pulled down and into the main body of the mare, pushing into the digestive system through the same exit as the anus.
Snakebite allowed herself a single moan, before she straightened up and stood tall once more. She was just doing her duty after all, as much as she enjoyed it. When the Royal Guard needed to take care of one of their own, Snakebite was the mare they turned to. She reached back with a hoof to carress the constantly sinking bulge, Moonbounce already up to her flanks in Snakebite's as she left the long expanse of tail on her journey to the stomach. "Sssorry, but sssometimesss it can't be helped," she apologised to her meal. "If it's any consssolation, you were deliciousss... I jussst hope you don't add too much to my rump." She gave her butt a quick prod to feel how curvy it was already, she couldn't do with getting fat.
Moonbounce's only response was a series of muffled cries, the "Mmmmppphhss!" quite unintelligible as she was pulled from tail to butt, the snake's throat bulge already pretty much gone as Snakebite was left with a sagging equine belly, it already letting out the burble of duty as Moon would drop right into the acidic pit, ready to be gurgled up into pudge and waste. She was quite powerless to resist after all. Her shoulders were squelched through last, pulled into the belly through the rear sphincter and pushing it outwards with her trapped form. Already a hoof pushed back into her from the outside, making the belly slosh and jiggle before the loud gurgles began.
Snakebite let out a loud and sudden belch, a mess of silver hairs coming from her maw and littering over the bed. She clapped her lips together to savour the taste and then smirked. "Mmm, you were a good one. Ssshame I couldn't ssswallow you with my jawsss," she told her weakly kicking stomach, patting it again as she saw the indents of hooves, and the push of a screaming muzzle as the mare inside desperately fought her demise. It didn't do her much good though. Snakebite's snake tail shook and then seperated apart, the head seeming to vanish as it became strands of snake coloured hair, matching her living mane as it fell back into position.
The rookie's who survived their first patrol wouldn't be back for a while, and such a big meal left Snakebite sluggish. The mare gave a yawn, before falling back onto the bed she had snatched Moon from, stretching out across it as she sank her head back into the very same pillow. She squished her hooves back against her belly, feeling it bouncing and wriggling as she yawned and snuggled into the covers. Nothing made her sleep better than a full gut.
---------
A few hours later and Snakebite was on the move again. She passed many guards who looked at her swollen gut, knowing it was another of them that she had shown the error of their ways as she trotted with a brisk pace towards the public guard toilets. The only show of anything improfessional was the occasionl flutter of her split apart tail as puffs of gas escaped her rear. She soon arrived at the toilet, entering and picking the first one she saw, ascending the porcelain throne and then taking her seat upon it.
The second her flanks touched porcelain her pucker pushed open and one of the messy logs the rookie had become emerged from her rear, sliding out as a thick but squishy mess which slid from her anus and out into the toilet below with the ease of driving a train through a tunnel, a wet plop below signalling the breaking of water as it splashed down inside. The next was just as easy, as was the next after that, the only thing breaking apart the monotony of the sticky but smooth logs was the occasional large bone which refused to digest, or the itchiness caused by a ball of fur or mane that somehow survived.
After the first few logs she felt a pressure in her urethra and she pursed the lips, a warm golden shower starting to pour from her, while another log prepared its descent into the toilet by sliding through her rear. There was a constant trickle from of yellow fluid, drizzling over the messy pile in the toilet before another log slapped onto the pile with a wet thump, a horrified skull popping out to bury into it as well. She made no noise or face as she rose up and cleaned herself, then flushed away yet another guard down the drain. She took a moment to examine herself in the mirror and frowned at her now plumper flanks. "Damn it... now my moons are all bouncy..." she growled under her breath. At least Moonbounce left something behind... Maybe next time she should think before acting...