I've seen theorys of what would happen if Hiccup had run away with Toothless. Most are more based off what people want to think would happen instead of what is most likely. This one is a bit of both. Enjoy!
"Looks like we're going on a little vacation, forever." Toothless trotted over to Hiccup and sniffed the basket he had. The boy set the basket by a rock. Inside he had some tools, a couple changes of clothes, a knife, some food, the book of dragons, and some sentimental stuff he couldn't leave behind. Hiccup strapped the basket to Toothless back. "Come on bud." Hiccup opened the prosthetic tail fin. The night fury cried slightly. As much as he hated the cove, he didn't want to make Hiccup leave his entire life for his own sake.
Toothless leaped into the air. The basket was pretty heavy but he could manage. "We have to find an island that is uninhabited, has a forest for hunting, and plenty of room to roam. Shouldn't that hard, should it?" Hiccup began to regret his choice but he had made it and there is no turning back now. "The past is in the past." He assured himself.
After a few hours the young pair came across a small island. It wasn't near fit for a permanent home but the could stay there for the night. The two landed on the shore. Hiccup shaped the sand into a somewhat bed like shape and tried to get comfy but he knew that was impossible. Toothless sat the basket on the ground next to a tree and he hung by his tail from one of the branches. "Night bud." Toothless cooed as Hiccup scratched under his chin one last time before dozing off to sleep.
The nest morning Stoick woke up bright as day. Today his son became a real Viking."Hiccup! Get up it's time to head down to the ring. Exiting day, right." Stoick opened the door to see Hiccup wasn't there."Hiccup? Ha ha very funny. Now where are.." He stopped when he saw a piece of paper on Hiccup's bed. The blanket was missing oddly enough. Stoick glanced around the room puzzled and he read the note.
Dear Dad,
I'm so sorry. I just can't do it. I'm not a killer. I just can't. I'm probably long gone by the time you read this. I'm so sorry. I wanted to be like everyone else but I'm just not. I'm not you or any of the other Vikings but it doesn't really matter. I can't tell you why I'm specifically leaving but I just can't stay. I'm sorry. I lover you.
Stoick saw tear drops stained the letter. His handwriting was smeared on the" I love you" part as if he had tried to erase it. Of course that's what he was trying to do but not because he didn't love his dad. He was worried his father didn't love him back. Stoick reread the note over and over. He ran all the way to Gobber's workshop."Gobber! He's gone!" Gobber looked up from his project(an axe prosthetic) and at his chief. "Who's gone? Hiccup?" Stoick nodded and handed his right hook man the letter. Gobber gasped as he finished. "Where do you think he could have...Stoick are you okay?" The mighty Stoick the Vast was obviously heartbroken.
He wasn't crying,yet. But you could see in his eyes the pain and fear he had bundled up inside. "Stoick. You have to cancel the final exam. We'll find him, bring him back, and fix everything. Okay" "Okay."
Stoick stood before a cheering crowd of Vikings. "Attention! The final exam will be delayed until further notice. Hiccup has...left. He refused to write it in the note. We'll find him and bring him back. If he agrees , he'll kill the Nightmare when he returns. If not Astrid Hofferson will instead." Astrid stood wide eyed as the entire village stared at her. She wanted to win but not like this. She was never to fond of Hiccup but she never knew him well enough. She thought that her jealousy and rage was the reason Hiccup left.
She was frozen in place. Eventually, after what seemed like hours, Stoick resumed talking about finding his son. While the chief spoke Astrid snuck away. None of the other teens seemed to notice.
I honestly don't think Astrid ever hated or loved Hiccup until she went on the romantic flight. She didn't know him very well as a person and she only knew that he was beating her in dragon training. Then on the romantic flight she saw Hiccup for who he really was and liked it. By the way when Stoick is yelling for Hiccup that it was an exiting day, I meant to end it with a period not a question mark. He wasn't asking he was stating what he believed to be a fact. Please review.