Some stories revolving around the gang theme. May require both partners to play multiple characters.
Medieval setting. My character is travelling in a caravan when bandits attack. The entire caravan is slaughtered, along with her family. The bandits haul her back to camp and spend the next couple days eliciting screams for mercy from her. Somehow, she grows accustomed to the treatment and becomes part of the gang.
The Kingpin's Moll
He's the boss of the mob, or someone suitably high up the hierarchy. He's got money, power... and her. She's his plaything, his personal whore. She despises him and what he represents, but she's trapped. She starts collecting evidence against him and secretly co-operating with the police. And then he finds out...
The Biker's Bitch
She's the girlfriend of a biker in a gang, and all that it entails - sex, violence and Harleys. The idea hasn't been totally fleshed out yet, but I'm thinking rival bike gangs and turf wars.