Naga TF, by Repeatedmeme.

Sasha woke slowly, the effects of the venom still rendering her thoughts and actions somewhat sluggish. Not that the sluggishness had any effect, of course; her attempts to move were denied by the thick chains on her hands and feet; even were she at full strength there was at most a foot of give between them.

Across the room from her on the wall to her right was bound her sister, Isabelle, clearly more awake and alert... And obviously terrified. She struggled wildly in her equally confining manacles.

 

It didn't take Sasha long to discover why Isabelle struggled so. Entering the room from a door in the wall between them was a naga, a woman from the waist up, but below that a large golden snake. Slowly, as Sasha stared at the abomination of the woman, Sasha remembered; They'd been ambushed, the guards of the caravan in which Sasha and Isabelle had been traveling picked off one by one, by creatures seemingly out of nowhere from under the sand. The devil spiders and their sand traps had left the sisters all alone in the stopped convoy, but only for a short while before the soft, slithering sound, the sight of golden scales, and blackness.

 

Sasha took the long second that it hung in the doorway to get a good look at her captor. The naga was fair skinned, much fairer than then sisters, well tanned even through their heavy robes. She had fiery red hair, and large, green eyes, which she used to look hungrily at the sisters. Her tongue darted out, tasting the air, but also drawing a circle in front of her as she licked her lips. The snake woman eyed them from across the room, her impossibly large and pert breasts rising and falling in time with her tongue licking the air for scent. "now", she hissed, "which on of you shall I enjoy first? Eeney, meeney, miney mo.." She repeated the rhyme, the tip of her long tail darting to point to each of the sisters in turn.

 

"And you are I T it". The golden-scaled tail stopped, resting on Isabelle. Sasha breathed a sigh of relief, but she quickly realized that the terms of her reprieve included whatever horrors to come be inflicted on her sister. Isabelle shivered as the snake lady drew closer, so that they were almost touching. "What is your name, my dear?" Whispered the naga into Her prisoner's ear, the long, forked tongue remaining out to lick her cheek after the words had been delivered. "Isabelle...", whimpered the prey. "And your sister?" "Sasha".

 

"Well, Isabelle, I'd like to welcome you to an exclusive club. But first, let us get you ut of those ratty clothes." The snake's clawed hands quickly ripped the burqa and hijab off of the prisoner, exposing naked skin beneath, well tanned despite the many layers of protective clothing. "my," whispered the snake lady, loud enough to be heard from Sasha's vantage, "what a beautiful specimen."

 

The nagas face contorted, prominently displaying her fangs. With a swift motion, she plunged them into Isabelle's shoulder, just next to her neck. Isabelle gasped in pain, but also in pleasure; clearly the venom had some form of narcotic effect.

 

The naga drew her full body tightly up to Isabelle, her tail coiled next to Isabelle's feet. "Yes, you'll make a fine plaything" the naga said, licking Isabelle's ear, then drawing her into a deep kiss. Isabelle recoiled, but only for a short second, before joining her captor in the kiss. As she tore away, Isabelle gasped, but the snake lady giggled. Soon, they were locked in another passionate embrace, and the nagas clawed hands moved upwards to carefully caress the captives breasts. Isabelle moaned loudly, audible through the kiss, and pushed herself forward, her breasts further into the naga's grasp, her pelvis grinding on the long tube of the snakes tail.

 

After several more long embraces, the naga broke off. Isabelle panted, her face flush, her expression rapidly changing from ecstasy to horror and back again as the naga pinched her nipples. Her claws traced down Isabelle's sides, finally resting on her hips, while the naga gently lowered her head. It paused at chest level, tongue flicking out to trace a line in the valley between Isabelle's breasts, and then moved on to suck each nipple in turn. Isabelle squirmed at each of these actions, but had otherwise given up the will to resist.

 

The nagas head finally descended to hip level, and her claws gently parted Isabelle's labia. Her tongue licked down, teasing the clit, then back up again through the parted folds. Isabelle's head reclined backwards, and she moaned loudly. "Yes, yesssssss!" Panted Isabelle, and Sasha saw to her horror that her sisters tongue was as long and forked as the nagas.

 

Isabelle continued moaning as the serpents tongue probed deeper and deeper into her slit. The changes, however, had not stopped at her tongue. Dark brown-red scales peppered the sides of her legs. As she convulsed with approaching orgasm, Isabelle continued to lick the air, tasting the scent of sweat, of sex, and of fear emanating from her sister across the room. The sickly sweet scent on her tongue, and the continued ministrations of her captors, brought Isabelle's pleasure to a head, and she went limp in the throes of orgasm.

 

The snake lady lifted Isabelle, and carefully unshackled her, holding her gently as she fell to her knees. Then, the snake uncoiled herself, leaning back seductively on the ground, licking fingers slick with Isabelle's juices. Sasha saw now that the scales just below the divide had parted, revealing the nagas own moist pink slit. Isabelle noticed to, and, with a face still dazed from orgasm, probed her fingers on the exposed nethers.

 

The naga and her captive embraced lips again, fingers probing each other, as Sasha watched in horror. Her sister, barely a year older than her and her companion in everything, had been reduced to this base creature. Even now as she watched, Isabelle pulled her legs together, scales spreading more rapidly, and Sasha doubted that she could pull them apart again.

 

Isabelle broke the kiss, and, flopping her legs in an odd manner required of their changing nature, descended towards her lovers waiting slit. She teased the dripping cave with her fingers, then her tongue, enjoying the new tastes and sensations that came from its new form. With its every lap against the wet folds, her fusing legs grew more clearly entwined, more scaled, more closely resembling the form of her captor. Finally, as the golden naga reached orgasm, the transformation was complete. No trace remained that Isabelle had once been human. Sasha openly wept.