Well, perhaps the fanfiction could be about Natsu training his pet dragon. He has to teach it how to fly better, control its strength, and also how to be stealthy. Along the way, they make friends with other magical creatures who also help in the dragon's training. And then they face a big challenge where the dragon's new skills are put to the test.
Maybe there are other dragon hunters in the story. These hunters see Natsu's pet dragon as a valuable trophy. They don't care about the bond between Natsu and the dragon. They just want to prove their skills by taking down such a powerful creature. So they keep chasing Natsu and his dragon throughout the fanfiction.
Well, perhaps it could be about Natsu having some special powers right from birth that are related to dragons. Maybe he can communicate with dragons in a unique way that no one else can since he was born with this dragon - like essence.
Maybe Natsu discovers a new magic spell that accidentally turns him into a dragon. He then has to figure out how to reverse it while dealing with the new powers and instincts.
Well, it could be about Natsu having some sort of special connection to the celestial dragons. Maybe he discovers he has celestial dragon blood in him and has to deal with the powers and responsibilities that come with it. He might also encounter other characters who either fear or revere him because of this newfound aspect of his identity.
Perhaps the story focuses on the bond between Natsu and the small dragon. The small dragon might have special powers that help Natsu in battles against villains in their magical world. It could also be about how Natsu takes care of the small dragon, teaching it things and growing together in their friendship.
One possible plot could be that Natsu, while being raised by the female dragon, learns unique dragon magic that is different from what he would have learned otherwise. He might develop a special bond with the dragon, like a mother - son relationship, and the story could follow his adventures as he uses the skills taught by the dragon to protect the dragon's lair or the surrounding area from threats.
Well, it could be about Natsu suddenly finding himself in a situation where he has multiple dragon companions who are all attracted to him. Maybe he has to deal with their different personalities and powers while also trying to figure out how he got into this harem situation in the first place.
One possible plot could be that Natsu, after years of slaying dragons and facing countless battles, decides he's had enough. He might choose to retire to a quiet place, perhaps a small village. There, he could start a new life away from the chaos of fighting. Maybe he'd teach the local kids about dragons in a more peaceful way, sharing his knowledge instead of using it for combat.
Maybe in the fanfiction, Natsu's emotional state causes him to turn into a dragon. After a great loss or a fit of extreme rage, his magic reacts and he transforms. This new form is both a blessing and a curse. It gives him the power to protect his loved ones better but also isolates him as he struggles to understand and control his new dragon instincts.
One possible plot could be that Natsu is cursed by a dark wizard. This curse slowly transforms him into a fire dragon. As he changes, he struggles to control his new dragon - like instincts and powers. His friends initially fear him but then realize they need to help him break the curse.