Relationship exploration is also a theme. The sex dream could be a catalyst for exploring different relationship dynamics. It could potentially start a new arc in a fan - created story where Rachel starts to consider different romantic or sexual possibilities that she hadn't before, either with existing characters or new ones introduced in the fanfiction.
Another theme could be humor. Fanfictions often use humor to lighten the rather risqué topic. The way Rachel reacts to the sex dream in the story could be really funny. She might be all flustered and her friends' reactions to her being in such a state could add to the comical element.
Secondly, use euphemisms and subtleness. Don't be overly explicit. You can describe the dream in a more suggestive way rather than being graphic. For instance, instead of detailed sexual descriptions, you can say things like 'Rachel was engulfed in a passionate encounter in her dream, the details hazy yet the emotions vivid.'
A less explored but interesting theme could be how Rachel's pregnancy affects the group dynamics as a whole. Maybe the focus of the group shifts from just hanging out and having fun to being more about taking care of Rachel and the upcoming baby. It could also explore how the other friends' relationships change in the context of this new addition to their little family - like Chandler and Joey becoming more responsible uncles - to - be.
Another theme is self - discovery. As they interact, both Abed and Rachel might discover new things about themselves. In some fanfictions, Rachel helps Abed better understand his emotions, and Abed helps Rachel be more confident in her own identity.
Another theme is the combination of Rachel's mortal world and Percy's demigod world. Fanfictions like to show how they bridge the gap between these two very different worlds, for example, Rachel introducing Percy to modern art while Percy shows Rachel the secrets of the demigod realm.
Friendship - turned - love is also a popular theme. They start as friends or just acquaintances in the Glee club context, and then gradually their relationship evolves into something more romantic. For example, in some fanfics, they start by competing against each other but end up falling in love.
One common theme is friendship. Since they come from different backgrounds in the story world, their journey of becoming friends is often explored. For example, Percy being a demigod and Rachel having her own unique abilities.
One common theme is self - discovery. In many fanfictions, Rachel is often on a journey to find out more about herself, her abilities, or her past. For instance, in some stories she might learn that she has magical powers she never knew about.
Conflict is a theme that can add depth to the fanfiction. It could be an external conflict, like dealing with a difficult person or situation that threatens their relationship. Or it could be an internal conflict, such as Tim or Rachel struggling with their own insecurities while in the relationship.
A prevalent theme in Twilight Rachel fanfiction is love. Rachel may fall in love with a vampire, a werewolf, or even a human in the Twilight - influenced setting. Also, the theme of acceptance is quite common. She has to accept the existence of the supernatural and find her place among them. For example, in some fanfictions, Rachel struggles to accept the fact that vampires are real but eventually comes to terms with it.
One common theme could be love and friendship. Their relationship might be explored in terms of how they support each other through difficult times.