To write such fanfiction, focus on the personalities and relationships of these characters. Maybe have them encounter a mysterious new dragon or go on a quest to save their village. Let your creativity flow!
First, you need to understand the characters of Toothless from 'How to Train Your Dragon' (HTTYD). Then, focus on creating a unique plot. For example, you could write about an adventure that Toothless goes on that no one has seen before. Remember to keep the essence of his character, like his loyalty and intelligence.
The fanfiction might focus on how the relationships between the characters change when the two worlds of HTTYD and HTTYD2 collide. For example, Astrid might have to adapt to new ways of dragon riding she sees in HTTYD2, and this could cause some friction or growth in her relationship with Hiccup. It could also involve the dragons from the first movie learning new skills from the HTTYD2 dragons.
I can't really point you to 'lemon' fanfiction as it usually involves adult - themed or inappropriate content. But in general, Toothless and Stormfly fanfictions that are popular often involve their epic battles side by side or their heartwarming interactions within the dragon - vikings community of Berk.
Well, you could begin by understanding Zephyr's character traits and the existing world of How to Train Your Dragon. Then, come up with a plot that fits and builds on that. Maybe have Zephyr face a new challenge or form unexpected friendships.
One common theme is friendship. Hiccup and Toothless's bond is a deep friendship that defies species boundaries. Another theme is adventure. They often go on exciting quests together in these fanfictions.
You can try searching on fanfiction websites like Archive of Our Own (AO3). There are often a wide variety of fanfictions there, and you might be able to find some related to Toothless and Astrid with the'sexy' aspect in different interpretations. Just use their search function and type in relevant keywords.
One idea could be that Toothless stumbles upon a magical lemon - like object that gives him the ability to communicate with other species in a unique way. This could lead to all sorts of interesting interactions and adventures.
One great fanfiction in this category is 'The Hybrid's Journey'. It delves into the unique bond between a female Hicca and a hybrid Toothless. The story is filled with adventure as they explore new lands together and face various challenges. It really captures the essence of the HTTYD world while adding a fresh twist with the hybrid concept.
Astrid would also be a likely main character. In both movies, she plays an important role in Hiccup's life and the dragon - human relationships. She could bring her own skills and perspectives when the two movie storylines meet. And of course, Stoick might be there too, as his presence and leadership were important in the first movie and his legacy could play a part in the fanfiction that combines the two.