smaug looking at bilbo

It's quite unlikely. Fanfiction often takes creative liberties, but such a specific and unusual healing method seems far-fetched.

For a 'bilbo and smaug fanfic', here's an idea. Smaug has a weakness that only Bilbo can detect because of his hobbit senses. Bilbo has to figure out how to use this weakness without getting killed. Another idea is that Smaug has a dream about Bilbo before they meet, and this makes him curious when Bilbo actually arrives. So, instead of immediately attacking, he tries to figure out what this small creature is. Also, what if Bilbo was able to use some of the dragon's own magic against him? Maybe there's a spell in Smaug's lair that Bilbo can manipulate to his advantage.

A group of dwarven scholars could be interesting side characters. They could be on a quest to learn more about dragon lore and end up in Smaug's lair at the same time as Bilbo. Or perhaps a wise old elf who has some knowledge of Smaug's past and can offer advice to Bilbo. Another option could be a small, sneaky goblin who is also after a piece of Smaug's treasure and causes some trouble for Bilbo and Smaug alike.

Smaug is introduced relatively late in the story. You'll come across him in a significant part of the plot.

Smaug was killed when Bard the Bowman shot an arrow into a weak spot on his underbelly.

Yes, there might be some. Fanfiction platforms often have a wide variety of crossovers. You can check websites like Archive of Our Own (AO3). Writers love to combine different fictional universes, and Harry Potter and Smaug from 'The Hobbit' are interesting characters to put together in a story.

Well, it depends on how you define 'good'. There could be fanfictions exploring the concept of a pregnant Smaug in different ways. Maybe some are more comical, imagining how the other characters in the Middle - earth universe would react to such a situation. Others could be more serious, delving into the implications it might have on the lore or the world - building.

One way to develop Bilbo in this fanfiction is by exploring her femininity. She could bring a different set of skills or qualities. Maybe she has a better intuition or is more in tune with nature. As she goes on the adventure, she could use these qualities to her advantage, and this would not only help in the story's progression but also in her own development as a character. For example, her intuition could lead her to find hidden paths or sense danger in a different way than a male Bilbo would.

Well, the plot could involve Harry being on a quest and stumbling upon Smaug's lair. Since Harry has his knowledge of magic and Smaug has his dragon - like power and greed for treasure. Harry could be tempted by the treasure as well, but his moral compass as a wizard would make him try to either reason with Smaug or defeat him in a magical duel to protect the local people of Middle - earth. This would create a really interesting dynamic between the two characters.

Often, there are themes related to the protection of the unborn. Since Smaug is a powerful and feared creature, the idea of something precious (the unborn) within him could lead to themes of safeguarding. Also, there might be themes of change, as Smaug's state would surely bring about some sort of transformation in his behavior or the way others perceive him.