In the world of demons, the Succubi and Incubi seduce humans in their sleep to kill for their own gain, but since Angels can fall into darkness, surly demons could arise from darkness and experience the light.
One Succubus, having had a lot of blood on her hands, done the one thing the demons are forbidden to do; question things. She wondered what on earth they were actually doing. She looked at how humans love one another, and hate one another; how they could all experience the ultimate good and evil. But she was part of the evil, and wondered what good felt like.
Where they were, friendship wasn't heard of, though she believed it could be crafted. Life is like a black market for them; retrieving what is required from the humans, and ruining their lives.
But she noticed how the only reason they 'enjoy' what they do, is because in their world, they don't experience any emotional connection. Just business.
After lots of thought and curiosity, one day, she discovered sorrow. Everyone looked at her as if she were a freak, threatening her to go to the asylum if she wont straighten up and do as she's told. After a period of sharp supervision, she finally asked, as if involuntarily 'Why are we doing this?'
and was sent straight to the cellars; she cannot influence others to think too! She was sent to the head of her order and spoke her mind and immediately saw the disgrace of her surroundings, yet also the pity she had for those like her. And suddenly a sense of strength for having found this out.
The order done what was deemed worse than killing; she banished to the human world, where she would experience the full spectrum of human emotion, and if she wants love so badly, she'd have to experience generations upon generations of her lovers' deaths, since she'd still be an immortal being. Unless, of course, she isn't really capable of such feelings, and her Succubi form would be permanently visible in the mortal world; she'd be considered a freak amongst them, and tortured in ways worse than the ways of the demon world.
She, empowered by her new wisdom, entered the human world as if it were an award rather than a punishment; with her head held high and her lungs breathing in the polluted air. As soon as her vision caught up with her, and the white light had faded, she found herself in a forest and she suddenly felt such fear of what to do next.
OR
She didn't question things out loud but simply observed in silence. And used her talent of deception to pretend she's entering a human dream, but instead cuts the dream connection and appears physically before the man in the human world. She fled from his house as fast as possible, destroying any physical connection to the demon world she had [maybe if she removed her horns or tail her connection to the demon world would fail, but these ideas still need to be further explored. I don't particularly want demons coming after her since that'd only cause even more fuss; so maybe she WAS banished instead rather than a run-away demon]
EITHER WAY
she makes it to the mortal world, and learns to discover human emotions and feelings. She was capable of controlling her 'dark' form so the humans would only see her as a fellow human.
She learns what it's like to take human feelings into consideration when talking to others and gaining a connection with them. Without a doubt, many were attracted to her, in which she gained much 'unwanted' attention (though, to be honest, she did enjoy it) and she grew to find her own character.
ONE DAY SHE FALLS IN LOVE
Whether she falls in love with one lucky guy or has the trouble of a many loving her is unknown at the moment, but either way, she tries to restrict herself from acting on her 'Succubi' lustful ways and finds someone worth fighting for [the trailer probably starts showing this cute relationship with a narration of the protagonists views]
AND SHE FALLS INTO HER INSTINCTS AGAIN
whether she kills her lover OR cheats on him and accidentally kills/damages others is unknown, but either way she falls back into her demonic ways and begins to understand the ultimate happiness and despair; especially when others brutally blame her and she goes into hiding. She wanders through
a forest where she hallucinates these strange people going crazy and running around madly, attacking her, and tying her up to a tree.
SOMEONE FINDS HER
perhaps some innocent person finds her; now a shell of a woman, and asks about her story. Whether her lover is alive or dead is unknown [depending on which plot twist I decide to use] but in the end, I certainly want some happy or hopeful ending. Because an ending based on her tragedies would be rather irritating. Maybe she becomes entirely human in the end.
TWIST:
Maybe she was never a succubi, but actually a HUMAN who was cursed and sent to the demon world and live a life of slavery, but there's always something about humanity that appealed to her--but then that'd contradict the idea of 'maybe demons can rise to goodness'. Or maybe, like some Cinderella story, IF she achieves something, she'll become an actual human.
BUT
that'd be too cliche. I'd like to think she lived many, many lives by the time someone asks about her 'story'. But I'm still unsure about things.
IN REGARDS TO FILMING,
It would be rather tricky to prepare... I'll need to think about simplifying ideas or getting many to help me out :)
This plotline still has many holes. I think if the 'real' world was based on a world of magic, it'd be less 'weird' for e succubus to come out of no where, and she'd be more comfortable in herself and everyone would know she's a demon; but the 'good kind' so she either evokes admiration or fear into people. There'd be more ideas to play with.
OVERALL
Getting some feedback from others could give me some ideas. If I were to perhaps take more inspiration from my Harry Potter fanfictions [in which she's only visible in the magical (not muggle) world and people slowly learn about who she is but only those closest to her, and she can easily tame her instincts and the wizards made it so she cannot harm anyone with who she is and so she could get involved with all sorts of friendships and relationships without causing too much harm. But there's still be emotional harm if she has a string of admirers! My imagination does go wild, I must say] the story could gain a different dynamic if I follow that dynamic. But I'll still stay open minded. But this is the most development my idea had so far :)
EDIT:
Somehow she gets to the human world (maybe banished from
demon world OR maybe some wizard opened a portal between herself and the real
world. Maybe she chose this 'world opener' from when she was in the demon
world, and met him in his dreams and told him how to get her there. So she
entered the real world not to return to the demon world! That'd be cool.)
And since she's an immortal being she has the punishment
that, if she does fall in love, she will do so many times over and will watch all of
them die in their lifetime (only just come up with that bit now!)
She goes through all sorts of tragedies and confusion, and
has to experience the 7 Deadly Sins and 7 Heavenly Virtues in order to know
what it is to be human (and she goes a little mad out of how rough life gets)
But I'd want there to be a happy/hopeful ending.