A really interesting plot could be that their new - found sibling relationship causes a stir in the Glee club. Some members might be skeptical, thinking it's a ploy for more attention. Meanwhile, Rachel and Puck have to deal with the fact that they have different friends in the club. They could have to navigate through the club politics while also getting to know each other as siblings. For example, Puck's bad - boy image might clash with Rachel's more uptight personality at first, but they gradually learn to accept and even complement each other.
Maybe the arranged marriage is part of a deal to save their families' reputations. Rachel's family wants her to marry into Puck's family to gain some social standing, and vice versa. Initially, Rachel is furious as she has her own plans for stardom. Puck, on the other hand, is more laid - back about it. But when Rachel's Broadway dreams start to crumble, Puck uses his family's connections in the music business to help her, which makes her see him in a new light and begins to accept the arranged marriage.
There's a fanfiction where Puck has to protect Rachel from some bullies at a music event. This fic explores their relationship in a more protective way. Puck uses his tough - guy image to keep Rachel safe, and in the process, they start to see each other in a different light. Their shared love for music becomes the bond that deepens their connection.
One idea could be that they initially struggle with the news but then grow closer as they prepare for the baby. For example, Puck might start taking on more responsibilities like getting a job to support them.
Their relationship as siblings would likely bring a new level of loyalty to the Glee club. They would support each other more openly, which could inspire other members to be more united. For example, if Rachel was being bullied by a rival group, Puck would be more likely to step in and defend her, setting an example for the others.
Perhaps in the fanfiction, Finn and Puck find themselves in an alternate universe where being gay is the norm in the glee club. This allows them to freely explore their relationship without the fear of judgment. They could then face the challenge of how to bring this new - found confidence back to their original world.
One great fanfiction about Puck and Rachel being pregnant in Glee could be 'A New Beginning'. It focuses on how they deal with the unexpected pregnancy and the reactions from their friends and families. They face challenges like school and their future dreams, but also find a new level of closeness through it all.
One great 'Puck and Rachel' 'Glee' fanfiction is 'Unlikely Duet'. It beautifully explores their relationship as they work on a duet together in a different setting than the show. They start to understand each other on a deeper level.
There's also 'Puck and Rachel: A New Duet'. This fanfic focuses on how they might support each other in their post - Glee club careers. It shows Puck being surprisingly protective of Rachel as she tries to make it on Broadway, adding a new dimension to their relationship.
A really cool idea for a fanfiction could be that Rachel and Finn swap personalities for a day. Finn suddenly becomes super - focused on his Broadway dreams like Rachel, and Rachel has to deal with Finn's more laid - back attitude towards things. It would be a humorous and also a great way to explore their relationship from a different perspective.
One idea could be that Rachel, being the new girl, tries to break into the Glee club which is already full of established cliques. She might have to prove herself not only with her singing but also in handling the drama within the club. Another plot could involve her having a secret musical talent that she's too shy to show at first but as she gets more comfortable in the new environment, she reveals it and wows everyone.