Perhaps the obsessed guy has a change of heart. He realizes his actions are wrong and lets the girl go. But this ending often comes with a complex set of emotions and consequences for both characters as they try to make sense of what has happened.
Often, the theme of rescue is present. It could be the girl trying to rescue herself or her friends and family attempting to rescue her. Also, there can be a theme of psychological manipulation as the obsessed guy may use various tactics to control the girl.
Sometimes, they might decide that they are better off as friends after getting to know each other more, so the story ends with a strong platonic friendship.
They're popular because it's a very relatable concept. Many people have had a crush on someone and felt that sense of obsession at some point. It's also a bit of a fantasy for some, seeing someone be so dedicated to another person.
She may start by trying to figure out who the kidnapper is and what his motives are. If she has any special abilities or skills, she would be thinking about how to use them to her advantage. For example, if she has telepathic powers, she could try to send a distress signal to her friends or family. Also, she might try to gain the kidnapper's trust in order to find a moment to escape.
The story might end with the realization that the whole experience was a dream, and the guy wakes up as his normal self. This would be a more psychological ending, suggesting that the transformation was a manifestation of his inner fears or desires. For example, if he had been curious about the experiences of the opposite gender, the dream could be a way of exploring that without actually going through a real - life change.
Well, often in these stories, the guy starts as a bit of a stalker - not in a creepy way though. He'll find out her daily routine and 'accidentally' bump into her a lot. Then there's the plot where he saves the girl from some sort of trouble, which makes her see him in a new light. Also, there's the scenario where the guy writes her love letters or poems to express his obsession in a more romantic way.
For a happy ending, the poor guy could achieve success through his own efforts. Maybe he starts a business or gets a great job opportunity. And the rich girl stands by him throughout this journey. Their relationship overcomes all the social and economic barriers, and they get married and start a family, living a life full of love and harmony.
She could break up with him immediately. In a fanfic, it's important for the girl to assert her self - respect. By ending the relationship, she shows that she won't tolerate such behavior.
First, create a compelling kidnapper. Make him have a clear motivation for the kidnapping, like revenge or a desire for power. Then, develop the kidnapped character well, showing their fear and determination. For example, if it's a fanfic of a detective show, the kidnapper could be a criminal the detective once put away, and the kidnapped could be the detective's partner.
One way for it to end well is if they both grow as individuals. The popular guy learns to look beyond appearances and social status, and the unpopular girl learns to value herself more. They could decide to go to different colleges but still stay together, proving that their relationship is strong enough to withstand distance. This would show that they've not only found love but also self - discovery through their relationship.