A woman goes in for a doctor visit and gets taken advantage of. She's too afraid to report him and he keeps making up reasons on why she needs to come back only to be made a slave. (Includes nc, can include bondage, and eventually submission) I'd play the captive.
A woman is home alone when a burgerlar breaks in. He has his way with her but notices how she is a natural (though she won't admit it at first) submissive. He ties her up, blindfolds her and gags her and takes her to his secluded cabin in the woods where he transforms her into his pet. She eventually comes to enjoy her new life and forgets her old after a couple failed escape attempts. I'd play the captive.
A woman is snatched off the streets in broad day light but no one does a thing as the city is one known for crime. She's stripped in the van after being tied down spread eagled. She is teased and toyed with (no sex yet) for the whole trip. Once at her destination a powerful man tells her they are going to play a game. If she can find her way out of his playground (basically his land but it looks like a wilderness with traps set to catch her she doesn't know about) he will free her unharmed. If he manages to catch her, she becomes his to do with as he pleases. I would play the woman and you the man deciding what he wants with her.
A female college student is visiting an asylum for a report. As she goes to leave, she realizes that somewhere during her tour she dropped her visitor's pass. The orderlies, noticing she looked just like a girl they had allowed to escape earlier in the day detain her, saying she's lying and she's actually the girl who escaped.
After some thinking on this one, instead of a student, it can be someone undercover investigating the asylum. They can realize what she's doing and detain her, locking her in solitary, basically making her disappear without killing her.
A trucker comes across my character who is hitch hiking. He offers her a ride but decides he's tired of being alone on the road all the time and decides to keep her against her will.
More ideas, some recycled from my long ago thread.