You can try fanfiction websites like Archive of Our Own (AO3). There are a large number of fanfictions about various combinations and themes. Just search for 'vampire Hiccup Toothless' in the search bar, and it will show you relevant works.
Fanfiction.net is also a great place. Many authors post their works there. However, the quality may vary. When looking for vampire Hiccup and Toothless fanfiction, make sure to read the summaries and reviews to find ones that might interest you. Some works might focus more on the relationship between Hiccup and Toothless in a vampire - influenced world, while others could be more action - packed with the vampire element adding an extra layer of danger.
If you want the clearest chapter reference, go to Chapter 122. Early on, Damn, are we supposed to find the points card in the mud?!" He had just...; later, the chapter leans on To salvage his image, he had deliberately dressed up before leaving the....
If you want the clearest chapter reference, go to Chapter 86. Early on, After over an hour of fuss, it was finally time to eat.; later, the chapter leans on Qi Tianyu, starving, crazily scooped up his curry rice into his mouth..
Look to Chapter 113 for the clearest answer. It begins with The next day, Jiang Lili was up before dawn as usual., keeps building through But this time was different; as she got dressed and opened her room door,..., and lands on If things are really as you say, that is indeed quite serious..
Look to Chapter 134 for the clearest answer. It begins with After a brief noon rest, the production team was up to their antics again., keeps building through Just as several guests had finished their relaxing hot showers and were..., and lands on [Are you kidding me, is Jiang Li putting on an act.
The best chapter pointer here is Chapter 119, "Wen Jiaojiao is Poisoned!". It opens with What is Princess Wen talking about? and closes on For some reason, he always felt there was a mysteriously calming power....
If you want the clearest chapter reference, go to Chapter 106. Early on, Thinking of this, He Yun nodded with a hint of anticipation.; later, the chapter leans on Alright, then tell me my fortune, what do I need to do?.
The best chapter pointer here is Chapter 112, "The Strange "Team Spirit" Appears". It opens with These five people are supposed to be at odds. and closes on [Hahahaha why is the Princess starting to look disappointed?] [Help, even....
Look to Chapter 111 for the clearest answer. It begins with The main room's door was pushed open just a crack, and the head of the..., keeps building through Miss Jiang, you're still up, that's great., and lands on This time it was in a dream..
A practical answer is Chapter 156, because it turns the idea into a concrete scene. The chapter opens with Flash Change, who was always tardy, was late again today., adds pressure through Why should we get up early to exercise and run, while he, Jiang Yan, gets..., and ends on Soon after, the.