Home?

Taken as a baby by Cloudjumper, Hiccup grows up in the home of the Great Bewilderbeast. But within the first moon cycle he was there, he falls ill, and Cloudjumper fears for his life. He goes to find his mother, who tells him about the Isle of Night, only to find it deserted with a single hatchling laying abandoned in a nest. Cloudjumper takes the hatchling back to the home of the King, where the hatchling heals Hiccup with his saliva. However. . . there were some dragonic side effects. . .

Years later, Toothless and Hiccup, being the mischievous teens they were, went out without permission of the king, or his mother. They begin pestering a certain village. . . until Hiccup gets shot down.