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.
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.
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.
They are a popular pairing because they are so different. Puck is the bad boy and Rachel is the over - achieving diva. Their contrast makes for interesting storylines where they can learn from each other.
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.
One great fanfiction could be 'Puck and Rachel: The Sibling Bond'. It shows how they navigate their high school lives together as siblings. They support each other through various Glee Club challenges and family issues. It really delves into their characters in a new way, exploring how Puck's tough - guy exterior softens when it comes to his sister Rachel, and how Rachel's ambition is sometimes tempered by Puck's more laid - back attitude.
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.
Another option is Wattpad. While it has a wide range of content, you can still find some good Glee puck and Rachel fanfiction. Just be aware that the quality might vary more compared to the other two platforms, but it's still worth checking out.
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.