Echo

Name: Echo

Appearance: Echo has the appearance of a pale mermaids with green hair, red eyes, and a green mermaid tail. She's completely naked and has medium sized breasts. Her vagina us capable of expanding and holding her prey as she pleasures them immensely, making difficult for them to escape her grasp.

Personality: Echo is a kind and loving demon, seeing humans as cute and adorable. Although she knows that there are some bad humans out there, she generally believes most are good, and won't attack them. If there's a specific human she likes, she will become very attached to that human, and try to force them to become her eternal mate through brainwashing rape. Once she obtains her mate, she will drag them to the bottom of the dam where they will copulate forever until the mate dies of old age.

Abilities: Echo has immense magical power, as do most of her kind. As such, she's someone who shouldn't be taken lightly as in an instant, her target will have everything below their waist be forced into her vagina where she rapes them vigorously as she brainwashes them in order to make them more docile. She'll implant false memories about their time as a couple, and if she isn't stopped, then her target loses all of their memories and gains the false ones, Echo provided.

History: Many years ago, the earth was relatively peaceful, but unfortunately things changed when a religious organization named M.O.W. unleashed demons unto the world, creating chaos and soon after, humanity lost its grip on the world as many demons, peaceful or not, spread throughout the land.

Echo and her species, the sirens were also demons that spilled forth from the great cataclysm that doomed the world, although she and the other sirehs were threatening at all, only wanting to mate with humsns and feed off their spiritual essence in a non-violent way. Swimming along the rivers, the sirens made a home in the water control plant, mating with many of the workers and refugees who holed up in there to avoid the powerful, yet seductive demons. The humans panicked at the sight of the sirens, but thanks to Echo, she was able to calm down hostilities between the two groups.

Unfortunately, things went bad when powerful demons ran through the safe haven that was their home killing and draining many humans in the process. As a result, the human leader of the plant tried to dump poison into the water to kill off the sirens, forcing Echo to rape the man and brainwash him, later absorbing his body into her own and melted him into nutrients for. Such techniques are forbidden amongst, the siren, but she had no choice... it was that or be driven from their home. The surviving humans left afterwards, not knowing what happened to their former leaders, making the water control plant, the domain of the sirens.

In this post apocalyptic land, demons are monster girls, with only a few number of males existing, but most of them are extremely weaker than their female counterpart if male variants ever existed.