An onsen room

Soon, an idea from the sea demoness' childhood appeared in her mind, the very thought making her a bit aroused. As a little girl, Mei loved onsens: hot spring baths that were quite popular in Japan, both among children and adults. As much as she liked the United States, when she was human, Mei missed the springs and their hot, humid feel on the skin at times, and would much prefer to make a personal one for herself. Now that she was a demoness, Mei realised, she could do just that, and this time, she and her friends would do more things there than just bathing and relaxing.

It took but a small expression of will for Mei to create a small indoors onsen in the house, and as she opened the door, it was there - hot springs and all, with showers above that spewed water and steam. Except that it was not water - not just water at least. As she constructed the room, Mei made sure that all of the water inside it contained a little bit of demon pheromones, that would quickly drive the girls mad with lust and facilitate their transformation. Still, not enough to turn them into succubi sluts immediately - the demoness wanted to bide time. Corrupting girls... personally was much, much more fun.

"...Take a look, girls, we have a new bath now! You look dirty, care to take a shower!" Mei proclaimed to the girls, who listened tentatively; the succubus aura of domination coupled with Mary and Tiffany's ministrations had made them easily suggestible, and the demoness didn't have much difficulty convincing them. Already corrupted to a small degree, the girls quickly stripped to their underwear remained and went into the water, caressing their bodies as the tainted liquid touched their skin. The twins came first, holding each other's bodies, and were soon followed by Jenna, Ayati, Mary and Tiffany, and finally Mei herself. As she walked in, the demon duchess quickly snapped her fingers, turning on the showers; water began raining on the girls' bodies, spurring their desires. Mei smiled: her plan had begun.

As Mei had thought, the Indian girl began acting first, starting to caress the head cheerleader's dark chocolate skin carefully, a blissful smile on her face; the black girl resisted the pleasure at first, but the water quickly eroded her old sexuality and she soon began enjoying the touch of her friend - and answering to her ministrations. As the girls' hands began caressing each other's sensitive bodies, Mary and Tiffany joined in the fun, grabbing the Asian twins and pleasuring them, and Mei made the girls come closer together, until all seven were next to each other feeling each other's touch. The eroticism of the scene, the demonesses' power and the tainted water easily destroyed the girls' notions of sexual preference and any thoughts of chastity, and their ministrations soon began more erotic. Slowly, seductively, the girls took off their underwear, began kissing and licking one another...

"Yes, Jenna, I wanted that for so long... please... make love with me... fuck me... FUCK ME!" - Ayati shouted as Jenna fell on her knees and began fingering her pussy, making the Indian girl moan in delight. At the same time, Leia and Miko were doing the same with Mary, just as she fantasised earlier, taking care of the demon princess' pussy and ass, while Tiffany and Mei were French kissing together, slowly taking on their demonic forms, their tongues extending in each other's mouths. The girls' eyes started flaring, glowing devilish blue, which made Mei realise that it was now time to begin the transformation. The sea succubus smiled, revealing a set of sharp demonic teeth, and whispered something in Japanese as the onsen's water began to bubble.

"Welcome to Hell!" - Mei exclaimed seductively, taking on her demonic sea monster form. Suddenly, cock-tipped tentacles began sprouting from the onsen, of the same colour as the succubus - grabbing the girls and invading their pussies, spouting corruptive cum into their bodies. The demon duchess moaned in delight as she saw the girls squeal in pain and pleasure - the tentacles were part of her, and she was enjoying every second of the violation. Mary and Tiffany quickly dropped their disguises as well, revealing their terrible yet sexy demon forms - smiling at their former friend that were soon to become their demon sisters. The cheerleaders' eyes were filled with a sense of immense dread for a few moments, but it was too late for them. Their demonisation had already begun.

The head cheerleader, Jenna, was the first to began their corruption, moaning with her now deep and seductive voice as she grew taller and slimmer. Her dark skin slowly lost its tinge and became pure dark grey, now glistening from the water, and her breasts expanded significantly until they were double D-cups. A tentacle-like tail extended from her now larger ass and short ram horns appeared on her head, her face now free of all imperfections. Finally, her wings expanded from her back, white in colour, her eyes becoming larger and ocean blue in colour. Jenna's Indian lover, who was licking Jenna's pussy at this time, soon joined in, her dusky skin turning metallic bronze in colour. Her formerly dumpy body was now becoming thin and athletic, with impressive, though not too large, muscles to boot, while her face became extremely seductive with huge eyelashes and glowing eyes. Bat wings too extended from her back, while a pair of antelope horns sprang on her head. Her breasts too expanded, even larger than those of Jenna, and her ass followed suit.

The Asian twins, who were doing a 69 with each other, were the last to transform, turning into hot blue-skinned Oriental demonesses with sexy short hair, small wings, perky breasts, cock-tails and small cow horns. Unlike the other girls, their figures were not volupuous but rather slender - though still gorgeous and stunning. The succubi cheerleaders immediately bowed to Mei, completely obedient to the sea monster woman, caressing her body as they looked at her with sea blue eyes, similar to those of their new mistress.

The demon duchess smiled, leading her new worshippers to queen Lydia. As the demonesses came before the MILF demoness's throne and bowed before her, Mei looked into Lydia's seductive eyes, waiting for orders.

"Good, Duchess Mei. Your first trial is complete. Now, your new mission begins..."