This is the first part of what is probably going to be a very long story. Comments are appreciated and helpful, and don't forget to vote!
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The cool flicker of the green-blue flames from floating torches lit the room up and caused odd shadows to dance in the corners. The light was not reflected by the black pool in the center of the room, though it bathed the woman crouching beside it in an eerie aura. She was gazing into the pond, patiently waiting for something. She did not need to wait long.
The pool began to bubble slightly and its surface became liquid silver, but still it did not reflect the green-blue of the flame of the torches. A shadow began to form on the surface and it grew larger and larger until almost encompassing the entire four-foot diameter of the pool. The woman stood and took a step back, a glow of ecstasy on her face. She brushed her long blonde curls away from her face and stood with her hands on her hips, her white gown falling open slightly, exposing her tanned flesh beneath. Her small nipples stood out on her ample breasts heaving with anticipation.
The surface of the pool was broken by two points from below its surface and the tips of the creature's wings slowly emerged. The leathery wings broke shimmered in the fire with the liquid running off them, and soon after they were exposed, the top of a head covered in silver hair broke the surface, followed by the powerful body of the demon. The eyes of the woman never left the break of the pool, her eyes devouring every inch of the spawn's slowly exposing flesh. When his hips broke the surface, her eyes glazed and got big, her mind drinking in the sight of the creature's crotch. The creature's legs and feet came out of the pool and he hovered above the pool for a brief moment as its surface stopped boiling, reverted to black, and hardened.
The demon stretched it wings, the tips almost extending across the 20-foot room. He smoothed his long silver hair back and put it between his wings. His tail twitched playfully as he stretched, the movement only accentuating the stillness of his rapidly engorging member. The woman could not keep her eyes off his body as he did this, watching every movement. Every muscle movement made her pussy hotter and wetter as she was consumed in lust for the creature in front of her. The demon looked at her and let out a deep, unnatural laugh.
"It is time to uphold your end of the bargain," his deep voice rang. The torches swayed as if on unseen wires as he spoke. Sweat had broken out on the woman's brow and all over her body. She involuntarily licked her lips tasting the salty sweat that was on them. Her quim felt like it was going to boil over with juice and melt at the same time. She could only muster a nod in response.
The demon laughed again. He stepped onto the stone floor, his feet thudding loudly in the silence of the room. The woman's back arched as the heat boiling in her groin intensified. Her nipples felt as if they had become her clit and were being tortured by her simple gown. Her clit felt hotter and more sensitive than it ever had before and every time the demon spoke or laughed it felt like a tongue was hitting its tip. With a gesture from the demon, her gown was sundered into ribbons swirling in an unfelt wind and then dissolved. She stood there, naked; every inch of her flesh exposed to him, her golden haired muff parted by the cleft of her sex and the slight protrusion of her engorging clit.
"Are you ready to fulfill your contract?" the demon asked. The woman came. Being this close to the incubus she summoned was too much for her and her juice ran down her legs and dripped to the floor in a small torrent as it rolled off her engorged lips. She moaned loudly and her knees began to quake. The demon laughed again, the bass from his voice prolonging her orgasm, making her pussy spray cum down her legs and all over the floor at her feet.