The fanfiction could start with Christine realizing she's pregnant and not knowing who the father is between Erik and Raoul. She keeps it a secret at first. As time passes, she begins to show signs, and Erik notices. He confronts her, and she finally tells him. Erik then becomes extremely protective. They go through a journey of self - discovery and learning to trust each other more deeply as they await the arrival of their baby.
One possible plot could be that Erik and Christine's relationship has developed secretly. When Christine discovers she is pregnant, she is initially scared but then realizes she wants to keep the baby. Erik, despite his insecurities, vows to protect Christine and their unborn child. They face challenges from society as their relationship was always a bit of a scandal, but they stand strong together.
One possible plot could be that Erik, being the complex and often misunderstood character, kidnaps Christine out of his obsessive love for her. He might take her to his lair, thinking he can protect her from the outside world which he believes is full of people who don't truly appreciate her talent. Then Christine could struggle between her fear of Erik and her understanding of his tortured soul.
Well, in this situation, their relationship would shift in several ways. First, there would be a new level of intimacy, not just physical but also emotional as they are about to become parents. Erik, who has always been a bit of an outcast, might feel more a part of society through his connection to Christine and the baby. Christine, for her part, would have to come to terms with Erik's darker side even more, as she is now bound to him in this new family unit. They would also have to deal with external pressures, like how to present their relationship to the outside world, which would either strengthen or test their bond.
In a different version, Christine gets lost in the opera house and Erik is the one who finds her. He could have been watching her from afar all this time. Instead of scaring her, he gently leads her to a safe place. They start talking about their dreams and fears. Christine realizes that Erik is not the monster everyone makes him out to be. This new understanding blossoms into love as they continue to meet secretly and share their innermost thoughts.
A simple fanfiction could be that Erik writes a beautiful song for Christine. When she hears it, she is deeply moved. She seeks him out to thank him. This encounter starts a series of meetings where they slowly fall in love. Their love is based on mutual respect for each other's talents.
There's also the theme of sacrifice. Sometimes Erik sacrifices his own desires for Christine's happiness, and vice versa. It adds a layer of depth to their relationship. And the exploration of their different social standings, with Erik being an outcast and Christine being a more 'normal' part of society, is another common theme in these fanfictions.
Christine might initially be very frightened. After all, being kidnapped is a terrifying experience. She could scream and try to fight back.
One idea could be that Erik takes Christine on a journey through his secret underground world, showing her all the hidden wonders he has created. This could deepen their bond and make Christine see him in a new light.
One idea could be that they find a secret place in the opera house where they can be alone and express their love. Maybe they start with a simple dance and then their passion grows.
Many popular ones will stay true to the original characters' personalities. So, Christine might be shown as kind and a bit conflicted, and Erik as complex and passionate. This helps the readers to feel more connected to the story as it aligns with what they already know about the characters.
Love and redemption are common themes. Since Erik has a troubled past, in many fanfictions, Christine's love redeems him. For example, in some stories, he learns to be more open and less vengeful because of her love.