Take an agoraphobe and fuel their fear of the outside, and you don't even have to kidnap them. "Yeah baby, I did hear about that awful shooting. Did you hear that one of the victims was your age?" or even "I think I got sick from work again, maybe it's better that you stay home so often, you always seem to stay so healthy!"
Completely destroy their relationship with the outside world unless it involves you. They will need you to protect them even in the smallest of situations. Really drive it home by taking a drive/walk through a dangerous area, they'll never leave again!














