Tentacles and Spells

Laris the warlock needs an apprentice, someone with raw, untapped power that Laris can control. She needs an apprentice because her relationship with her patron, the inter-dimensional horror Kharax Trelgrarach Bobyar, was complicated and and dangerous.  Vespera is a beautiful human woman working as a scullery maid in a bordello. She has true potential beyond being a menial worker, beyond being a warlock, beyond being a tool for someone else's sexual wiles, beyond being a sexual plaything for a powerful cosmic evil.
Laris is eager to take advantage of Vespera in every way. This is a 42, 000 word erotic story that contains explicit sex and sexual descriptions. All characters are 18 or older. Originally published in four parts as Bound by Tentacle and Spell. Excerpt: Laris easily moved around the taller woman. "You might want to step back." "Why?" Laris didn't answer her. Instead she started chanting words that Vespera heard but couldn't comprehend.
Much to Vespera's alarm, the runes scratched into the top of the edge rocks started to glow. "I should leave, " Vespera muttered to herself. She wanted to dash up the stairs and rush out of the manor, but she knew she would quickly find herself lost in the confusing path they had traveled through the house. When the creature all but exploded out of the well, Vespera shrieked in surprise. Even though she knew she had gotten herself involved with-through no action of her own-a woman who was a powerful sorceress, Vespera was still horrified at the monster that appeared from the well. It was all but impossible to describe.
In the weak light all Vespera could see were long, squirming tentacles that seemingly connected to a massive body that was mostly hidden by the infinite amount of prehensile limbs flailing about. The creature's skin was moist and dripping. The color varied from pure white to bright pink. Some of the tentacles ended in tapered points, some ended in sharp spikes, some ended in club-like knobs, and more than a few ended in obscene mouths from which issued forth unnatural gray tongues. If Vespera knew that one of the ancient gods lived beneath the streets of Yort she never would have remained in the city for more than a minute. As much as she wanted to run, she found that she couldn't, not because she was magically held in place, but because she was fascinated at what she saw. Laris knelt before the creature, spread her arms wide, looked up at the obscene horror, and cried out, "I seek to renew our partnership, Kharax Trelgrarach Bobyar." She was naked and vulnerable and felt the familiar thrill that always accompanied her patron.