Hey,
I already have a fic called 'Can love survive it all' based on this very concept. The only hitch is that the kidnapping is probably by the 8th chapter. Before that a lot of history, shared past and angst dominates the story. If you're interested here's a link:
Summary:Ginny has left her past behind and gotten engaged to a secure and caring man. But her past keeps haunting her. What happens with her past turns up on the day of her engagement, threatning to lock her up, untill she gives him and their relationship another chance. "I want to speak to you". "I don't want to hear anything you have to say. Please leave." She was going to leave, just turn around and disappear. He couldn't let that happen. He caught her wrist as she was turning and spun her into his arms. He placed his lips firmly on hers and touched the Portkey in his pocket.
Link:
Can Love survive it all: click here