I highly doubt it's a popular fanfic given the rather inappropriate and unclear title. Most popular fanfics usually have more engaging and appropriate titles that give a better sense of the story.
In addition to Natsu, Wendy could be a main character in the 'natsu is a dragon god fanfic'. Since she also has dragon - related powers, she could have a special connection with Natsu in this new situation. Maybe she helps him understand more about his dragon god powers. And Makarov, as the guild master of Fairy Tail, would also be a significant character. He would be concerned about how Natsu's new status affects the guild and the magical world as a whole.
I'm not sure specifically as it could vary greatly. It might be a fanfic about Natsu from 'Fairy Tail' who is a different kind of dragon, perhaps with unique powers or a different origin story compared to the original.
Well, 'natsu' might be a character's name. And 'boobs' is a rather inappropriate and unclear part of the title. 'Of the dragon' could suggest a connection to dragons in the fanfic. Maybe it's about a character named Natsu in a story where there are dragons and some aspect related to the character that is unfortunately named in a vulgar way in this title. But again, this is all speculation without actually reading the fanfic.
Lucy could be part of the story too. She might befriend the small dragon and use her celestial spirit magic to help Natsu and the small dragon in their adventures. There could also be some evil characters like Zeref who might try to use the small dragon for his dark plans.
Well, perhaps the plot could involve Natsu hiding his dragon identity from his friends in the guild. He might be worried about how they'll react if they find out. Maybe there are certain powers that come with being a dragon secretly that he has to learn to control without anyone noticing.
Well, in many Fairy Tail Natsu Dragon Form fanfics, we often see an expansion of Natsu's powers. Some fanfics might explore his new abilities in more detail, like how he can control different types of dragon magic that he couldn't in the original series. It's really exciting to read about his enhanced combat skills and the unique ways he uses his dragon form.
The theme of acceptance is big. Natsu has to accept his half - dragon side, and his friends also need to accept this new part of him. And there's also the theme of identity. Is he more dragon or more human? It's something the fanfic often explores.
One popular 'natsu transforms into a dragon' fanfic is 'Dragon's Ascent'. In this fic, Natsu's transformation is a result of a powerful ancient magic he accidentally awakens. The story is filled with intense battles as he tries to control his new dragon form and the powers that come with it.
Well, without reading it specifically, it could be about a fan - created story involving Natsu with some sort of lightning - enhanced flame dragon powers. Maybe it details his adventures, battles, or character development in a unique scenario that the fanfic writer has dreamed up.