Here are a couple of ideas.
The Barbarian and the Princess
A band of barbarians raid a royal convoy containing a princess. One barbarian captures the princess and decides he wants her for himself and runs off with her. The rest of the band chases after them. The princess does whatever he says, but is tying to find a way she can escape herself. She may fool him to thinking she is in love with him, but is just manipulating him. The roles get reversed, he begins as a dominant, but then his own addiction for her allows her to take charge.
The Librarian and the Demon
A Librarian discovers a mysterious book deep in the library's archives. She reads from it not knowing she is summoning a demon who shows up in human form. She finds herself compelled to follow his every command. She is aghast by what he makes her do, but secretly she enjoys it, as he is there to fulfill her secret unconscious fantasies. She becomes secretly obsessed with his visits to her at the library, but she is also conflicted because the acts are so depraved. As the visits increase things in her life begin to change in very troubling ways and she begins to wonders how to get out of it or maybe not...
A female college student at a prestigious school commits a very heinous act that she would like no one to discover. The professor is the only observer who devises a very unconventional detention session she must adhere to to maintain his silence.
I like a lot of plot discussion and seeking someone who wants to co-create a story. If any of these seem interesting PM me with your ideas.