This story is based on an excellent set of images by a 3d render artist called Snapshotz3d.
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CW: Sexual encounter involving horror elements, monster stuff, and dubious consent. Please consider this before reading further.
The Dark Horror descended like storm clouds over still waters. The light shrank back before it, the air grew thick and heavy, and the very sky seemed to sink beneath its weight. Its shadow fell over a Flower of Elvenkind--a maiden mere centuries old who awaited its arrival with quiet resolve. She was stretched out supine in a sacred grove, her supple form cushioned by emerald grass and gleaming with the inward light of her immortal life.
Dark forces were eroding the barrier between her sacred home and the outside world. The forest of the immortals was beset on all sides by evils older even than Elvenkind itself, and the twilight of the undying race was at hand. Once proud and certain of their future, the elves were growing weary and beginning to lose hope. The evils of the outside were the stuff of stories no longer, and their power was growing with each passing season. The maiden, in desperation, had made a bargain with the worst of those forces--ransomed herself for the future of her people and their sylvan home. She'd offered the Dark Horror her beauty and her immortal body, and now it had come to claim its prize.
She sat up at looked about her in alarm as horizonless dark swallowed up the light. The sun shrank away behind gathering pillars of living night. The silver leaves that adorned the grove's ancient boughs grew dull and leaden, and a cloying wetness took the place of the grass beneath her. All at once she was alone in empty space, and the warm summer air was replaced by simple vacancy. Whether her verdant surroundings had just been hidden from sight, or whether she'd been whisked away to some nether plane, the maiden could not say. But whatever the case, the effect was the same, and she shrank before the enormity of the void that had surrounded her.
Though the darkness had eaten up the beauty of her sacred grove, the maiden's own allure remained undiminished. She was young, by the measure of an immortal, and she looked after centuries as a Human might after just two decades. Her body was tall and statuesque, and her skin clear and shining white. She leaned back on slender arms and her long, gleaming legs were drawn up tight against her chest. Her eyes were green as the grass in her sacred grove, and darted furtively about, searching in vain for signs of something--anything--in the darkness around her. Her lips were parted between rosy cheeks, and her breath came quick and short. Flaxen hair that had once moved in the breeze now hung straight down and spilled over her shoulders, and her pointed ears rose up through the delicate tresses to salute a sky that wasn't there. She sat there for a time, with nothing but the sound of her breathing and her quickening pulse. She did not second guess her decision to parley with the enemy, but her mind raced as she considered what it would be like to meet her foe in this place of unyielding nothingness.
She did not know how long she waited there--there was nothing to tell time by after all, and she had the sense that she might wait a thousand years in that place without realizing it. Whether she sat there for a minute or a millennium, it was a rustling behind her that finally signaled the end of her vigil.
She gave a soft cry and her breath stopped for an instant. Her eyes went wide, and she was on her feet in a heartbeat, whirling on her heel to find the source of the whisper-quiet disturbance. She was certain it had come from behind her, but she stared into the dark and found it unchanged and empty. She wondered if there had been a sound at all, or if her mind had simply dreamed up something to fill the silence.
Standing fully upright now, she was a true vision--immortal beauty embodied. In spite of her fear and the cowed look on her angular features, her body was proud and radiant against the malevolent darkness that enveloped her. Her long limbs and lean trunk were almost aglow, and she had only two scant garments to cover her, fringed with gold and woven from silk whose luster matched that of her perfect skin. One hung loosely about her waist, cinched on either side with simple rings, covering only her most intimate parts and leaving her legs bare. The other hung over her breasts. It barely masked their fullness and covered little more than her nipples, whose faint impression could be seen through the fine material. These were the ceremonial garments of one who intended to commune with the gods, and though it was no deity of hers that she was to meet, the Elf could think of nothing more fitting to wear than this.
Across her delicate ribs, just below the round undersides of her breasts and above her pale stomach, was a vibrant floral pattern, painted in colors drawn from crushed flower-petals. Like her garment, it was meant to increase her beauty before the eyes of the gods, and she'd wondered as she applied the dyes if it would matter at all to the Dark Horror.
The rustling sounded behind her again, and again she whirled around, and again she was met with darkness. Without thinking, she took a step forward--to what purpose she could not say--and she screamed when her delicate footfall found nothing but empty space. She realized, too late, that she had stepped over the edge of some invisible precipice. She screamed a second time as the ground went out from under her and she was falling, falling from nothing and into nothing, but falling without a doubt. Tepid winds rushed up as she plunged downwards, raking her flailing limbs, whipping her flaxen hair about her head, and undoing what little modesty her garments had afforded her.
As the wind crashed about her and she toppled head over heels through the void, she gradually became aware of a deep, throaty sound that was just barely audible beneath the gusts. It was a low, contemptuous laugh that mixed with the windblast and rippled over her limbs and loins like so many phantom hands. She was in a panic, heart pounding and screams piercing the silence, but when she heard and felt that sound, something else began to creep in besides her frantic, immediate fear. It was a dreadful certainty. Certainty of what, she could not say, but that low chuckle rose up to meet her and filled her with a colossal sense of the inevitable--of utter powerlessness before something nameless and all-knowing. And just as she thought she might go mad before the enormity of some unspeakable realization that roiled just below the surface of her awareness, her fall stopped.