If Sheldon and Penny were in a fanfiction where Penny is pregnant, their friends in the group would also play important roles. Leonard might be jealous or concerned about how this will change the dynamic. Raj and Howard could offer their own brand of comical advice. The story could explore how the entire group adjusts to this new development, and how Sheldon and Penny's relationship evolves not just as a couple dealing with pregnancy, but also within the context of their friendship circle.
One common plot twist could be that the pregnancy is unexpected for both of them. Maybe they were just friends or colleagues and then suddenly they find out Penny is pregnant, which throws their relationship into chaos. Another could be that there's some kind of mix - up at the hospital regarding the pregnancy test results, leading to a lot of misunderstandings and drama. Or perhaps Sheldon discovers some new scientific phenomenon related to Penny's pregnancy that no one has ever seen before.
In many fanfictions, their relationship deepens. They start to rely on each other more. Sheldon, who is usually very logical and set in his ways, begins to show more empathy towards Penny. Penny, on the other hand, helps Sheldon understand the more emotional aspects of pregnancy. They might have cute moments where Sheldon tries to take care of Penny in his own unique, sometimes clumsy way, like making sure she eats the right foods according to his research.
Leonard would probably be really shocked at first. He's known Sheldon for so long and might not have expected him to become a father. Howard and Raj would likely be full of jokes and teasing, but also offer their support in their own goofy ways.
Yes, it can be quite a popular theme. Many fans are intrigued by the idea of such an unexpected pairing having a baby in fanfiction. It adds a whole new dimension to their relationship, which was mainly platonic in the original show. It allows for exploring different character developments and storylines.
One idea could be that Penny and Sheldon find out they're pregnant unexpectedly. They then have to deal with their different personalities while preparing for the baby. Sheldon might start making scientific plans for the baby's upbringing, while Penny tries to keep things more laid - back and normal.
Some common plot twists include things like the baby being born prematurely and having to fight for its life. Or perhaps it's discovered that there's a genetic anomaly that only Sheldon and Penny's combined genes could create. There could also be a plot twist where an old flame of either Sheldon or Penny returns, causing jealousy and tension during the pregnancy.
Well, 'A New Chapter for Penny and Sheldon' is a great 'penny x sheldon fanfic'. It starts with an interesting premise where Penny accidentally discovers a side of Sheldon she never knew before. This leads to a series of events that change their relationship dynamics. Also, 'Shared Secrets' is quite good. In this fanfic, they share personal secrets that bring them even closer. And don't forget 'The Changing Dynamic' which shows how their relationship evolves over time in a very engaging way.
I'm sorry but 'lemon' fanfics often involve adult or inappropriate content, so I can't recommend them. However, you can look for general Sheldon and Penny friendship or platonic relationship fanfics on fanfiction.net.