Toothless is the most likely one. Their bond is so strong that Toothless would sense Hiccup's distress and come to his rescue. He could fly into Drago's hideout and cause chaos to free Hiccup.
Unique? Well, it might be the way it can explore their relationship in a more...intense way. But since 'lemon' often involves mature themes, it can be a bit controversial. It might show a side of their bond that is different from the regular family - friendly portrayals in the original work.
One common theme is the growth of Hiccup under Stoick's guidance. Even if they have differences, Stoick's wisdom and experience help Hiccup become a better leader. Another theme is sacrifice. Stoick might sacrifice for Hiccup, or Hiccup for the ideals Stoick instilled in him.
Hiccup's friends would be extremely worried. Astrid, being Hiccup's closest friend and love interest, would probably be the first to take action. She would gather the other riders and start planning a rescue mission right away. Snotlout might initially be a bit hesitant, but the thought of losing Hiccup would push him to join in. Fishlegs would use his knowledge of dragons to figure out where Drago might be hiding Hiccup.
In this kind of fanfiction, perhaps Hiccup would be in great danger. Drago might use Hiccup as a hostage to get something he wants, like controlling the dragons that are allied with Hiccup's people. He could also try to force Hiccup to reveal the secrets of his unique bond with Toothless.
The main characters are clearly Stoick and Hiccup. Stoick is Hiccup's father, and in this fanfiction, their encounter forms the central plot. Hiccup, as the character from the future, has likely developed and changed a great deal since Stoick last saw him.
In this fanfiction, perhaps Stoick would be amazed by how much Hiccup has grown and changed in the future. He might see all the new inventions and ways of life that Hiccup has brought to Berk. Maybe there would be a moment of pride as he realizes his son has become a great leader.
Well, writing a Stoick and Hiccup lemon fanfiction is a bit tricky. You should start with researching the 'How to Train Your Dragon' universe thoroughly. For the lemon part, you need to be very careful about how you handle the mature themes. You could start with a scenario where there's some sort of conflict or deep emotional moment between them that leads to the more adult - like interactions. However, be aware that this type of fanfiction might not be welcomed by all fans of the original work, as it can be seen as going against the family - friendly nature of the franchise.
I'm not entirely sure about specific Stoick and Hiccup lemon fanfictions. But in general, when looking for such fanfictions, you can try searching on some well - known fanfiction platforms. Just be cautious as the content can be quite adult - oriented in nature. It's also possible that there are more family - friendly interpretations that focus on their strong bond without the more inappropriate elements.
Yes, he might. Hiccup is a character from 'How to Train Your Dragon' series. If there is an interesting HTTYD 2 fanfiction out there, it's possible that someone could imagine Hiccup reading or being involved in it in some way in the context of fan - created stories.