Another good fanfiction idea is to have Penny's pregnancy bring out a more nurturing side in Sheldon. He could start knitting baby clothes for Penny's baby using his 'logical' knitting patterns. This would not only be a cute addition to the story but also show a different side of Sheldon's character in relation to Penny's pregnancy.
A fanfiction could also explore the idea of Penny having pregnancy cravings that the guys in the group try to fulfill in their own nerdy ways. Like if she craves pickles and ice cream, they might try to create a 'gourmet' version using some scientific cooking methods they've learned, while also dealing with the chaos that Penny's hormonal changes bring to their group dynamic.
A lot of fanfiction could explore Penny's emotions during her pregnancy. She might be excited but also a bit scared. In the fanfic, we could see her relying more on Leonard for emotional support. And the gang could throw her a really special baby shower, filled with nerdy and fun elements, like Star Trek - themed baby clothes or a cake shaped like a scientific formula.
As far as I can remember, there is no such Penny wedgie incident in The Big Bang Theory. The series was filled with different kinds of comical situations. For example, there were Sheldon's idiosyncrasies, Howard's attempts to pick up women, and Raj's selective mutism. But a wedgie incident for Penny just doesn't seem to be part of the storylines.
One plot idea could be Penny struggling with how to tell Leonard. She might be worried about his reaction and how it will change their relationship. Another could be the gang's over - the - top reactions and attempts to help, like Sheldon trying to create a perfect baby - rearing schedule.
There are many possible fanfictions on this topic. One could imagine that in the fanfiction, Penny's pregnancy might bring a new dynamic to her relationship with Leonard. For example, they could become more protective of each other and start planning for their future as parents more seriously. It might also affect their friendships with Sheldon and the others. Sheldon, who is not always good with changes, might initially struggle to adapt to Penny being pregnant and the new baby in their lives.
There could be a fanfiction where Penny's pregnancy makes Leonard super nervous. He starts freaking out about being a dad and all the responsibilities. Meanwhile, the rest of the gang tries to support them in their own clumsy ways. It's interesting to see how the characters' relationships develop during this big life change.
There might be a fanfiction where Penny is pregnant and she starts to feel really isolated because she's the only one in the group going through this. She misses her old life a bit, and the story could be about how she overcomes these feelings with the support of her friends and Leonard. It's very emotional as it deals with her internal struggles.
Penny's friendship with the whole gang is a great storyline. She is often the bridge between the nerdy guys and the more 'normal' world. For example, she helps them with social situations and they, in turn, help her with things like knowledge and different perspectives.
There are no such inappropriate stories in the official plot of 'The Big Bang Theory'. The show mainly focuses on the nerdy and humorous interactions among the characters, their friendship, and their romantic relationships in a family - friendly way.
Some Penny x OC fanfiction focuses on the OC being a musician. Penny, with her love for music and performing arts, is drawn to the OC. They could start collaborating on a musical project together. Maybe the OC writes a song for Penny to perform, and through this process, they develop a deep connection. It's a fresh take on Penny's character and adds a new dimension to the Big Bang Theory universe.
Another plot could be Penny dealing with the challenges of her acting career while pregnant. Maybe she gets offered a role that she really wants but is worried about how her pregnancy will affect it. This could lead to some interesting drama as she tries to balance her dreams and her new family situation.