Here are some plot ideas that I have come up with to be more specific.
Real Life (Modern)
Unable to pay their bills, the Criss family makes one of the hardest decisions of their life. They decide to sell their daughter to a wealthy man who expressed great interest in her. In return, all of their debt would go away and they'd have plenty left over to get back on their feet. What they didn't know is that they sold her to a sadistic man, who has sinister ideas of brutality mixed with sex.
( Master / slave, non-consensual, force, pain, torture (sexual and non-sexual), branding )
He's obsessed with werewolves. He couldn't help it. Everything about them turns him on, and he knows that no werewolf in their right mind would accept mating with a human. So he decides to kidnap one. With his new pet, he is getting everything he could ever dream of, but as it nears transformation time, did he bite off more than he can chew?
( Master / slave, werewolf / human, forced submission, non-consensual )
I'll be posting more as I think of them.