In many fanfictions, Toothless and Hiccup's relationship is explored through adventure and deepening emotional bonds. Sometimes, they face new challenges together that strengthen their connection.
Typically, these fanfictions might focus on the emotional connection and mutual growth of Fem Hiccup and Toothless. There could be challenges they face together and how they overcome them.
There are many ways this fanfiction can explore their relationship. It could focus on their adventures together, their emotional bonds, or how they overcome challenges as a team.
You could focus on developing their relationship further. Maybe explore how they deal with growing up and the challenges that come with it. Also, think about adding some unique elements to the world they live in.
To write such a fanfiction, focus on building the chemistry between Hiccup and Toothless. Come up with unexpected situations that challenge their relationship and force them to grow closer. And don't forget to sprinkle in some emotional moments to make it really touching.
Toothless might use his firepower and speed to fend off enemies threatening Hiccup. He could also use his intelligence to anticipate danger and keep Hiccup safe.