Disclaimer: I don't own the Dragons series. The series is property of DreamWorks animation studios and Netflix.

Author's Note: This is an idea that pops into my head a lot. I've noticed nobody else does a story like this, so I decided to do it. I hope it works out. This takes place during Race to the Edge, after the reveal that Heather is Dagur's sister.

My idea was that Stoick the Vast and Oswald the Agreeable decided to guarantee their alliance. To unite their two tribes through a marriage between their children should they have children of opposite genders. When Oswald has his second child, his daughter Heather, and Stoick's wife Valka has their first child, their son Hiccup, they make it an official betrothel.

Well, here goes nothing.

A Long Kept Secret

-Berk, Eighteen years ago-

Stoick had waited nervously for hours to hold thr child his wife Valka was giving birth to. He was happy, but at the same time concerned because the baby was earlier than they had expected. He finally heard a baby cry and knew immediately what that meant. The healer, Gothi, came out and gave him the news. His friend Gobber translated for him that the baby was a boy but he was small and not very strong compared to most babies. Despite this, Stoick refused to give up on him. He believed his son would make it. And his faith was rewarded. Valka affectionately named the baby boy Hiccup.

Once it was confirmed that little Hiccup would survive, many chieftains sent presents for Stoick's baby boy. Stoick even gave his son a tiny axe, which Valka was not pleased about in the least. Later on, the Hooligan tribe was visited by their latest ally tribe, the Berserker tribe and their chief Oswald the Agreeable. The man even brought his own children, his three year old son Dagur and his five month old daughter Heather.

"It's good to see you old friend," Stoick happily greeted his friend. He looked down at Dagur and asked, "And how have you been, Dagur?"

"Pretty good," said Dagur. He then sported a deranged grin and shouted, "Take this!"

Dagur swiftly kicked Stoick in the stomach and ran away laughing. Oswald groaned and face palmed while Stoick groaned in agony.

"Oh, that little fucker is gonna get it for kicking the chief!" Spitelout shouted.

"Spitelout!" His wife shouted, holding their three month old son Snotlout in her arms. "Not in front Snotlout!"

"Relax, dear," Spitelout said as though it was no big deal. "He doesn't understand. He probably won't even remember I said it."

"If his first word turns out to be a profanity, I will break your arm so bad it will take months to heal properly," Spitelout's wife warned him in a dark tone. She then turned smiled at her baby and said in a sweet tone, "Come on, honey. It's almost nap time."

Spitelout shook nervously as he watched his wife walk away with their son. He then followed close behind, inwardly praying to the gods that his son woukd not repeat any curse words he said.

After that, Oswald turned his attention to the Hooligan chief and said in an apologetic tone, "I'm so sorry, Stoick. I just don't know what to do with him."

"It's alright, Oswald. I'll be fine," said Stoick, recovering from the kick. "Boy, he's got a strong kick for a child his age."

"If only he'd put it to good use," Oswald said, rolling his eyes.

"Is this little Heather?" Stoick asked sweetly upon noticing the baby in Oswald's arms.

"Yes, it is," Oswald happily answered. "Brought her and Dagur all the way here to meet your little Hiccup."

"That sounds like a good idea," said Stoick. "He's at the house right now with Valka. Let's go."

"Alright," said Oswald. "Dagur! We're going to Stoick's house! Put down that axe!"

Once they got to Stoick's house, Valka happily greeted Oswald and the children.

"Hello, Oswald," Valka said happily. "And hello to you too, Dagur. And you, little Heather."

"Dagur, this is my wife Valka," said Stoick. "Your sisters horn as a gift was her idea. She wasn't pleased with my choice for yours when you were born."

"You gave him a sword, Stoick," said Valka, clearly annoyed. "That's dangerous for a baby."

"He's the future chief," Stoick said. "Learning to fight is essential."

"When they're old enough to hold them, yes," Valka argued, now looking a little scary. "And you did it again with Hiccup! Only it's an axe this time!"

"Uh, Stoick, Valka," Oswald said, getting their attention. "The baby."

"Oh, right," Valka said, calming down. She smiled and said, "Hiccup's over here."

Valka led Oswald and Dagur to a cradle and allowed them to look inside. Hiccup smiled and laughed when he saw them.

"He's adorable," said Oswald.

"Why is he so puny?" Dagur asked. "He's even smaller than Heather."

"Dagur!" Oswald scolded. "It's rude to ask questions like that."

"It's okay, Oswald. Really," said Valka. She looked at Dagur and explained, "Hiccup was born earlier than we were expecting. As a result, he isn't as big as other babies that were born this year."

"He's actually the third one of his name in our family," said Stoick. "His full name is Hiccup Horrendous Haddock III."

"Oh," said Dagur. "Can I hold him?"

Before Oswald could say 'no', Valka smiled and said, "Of course, sweetie." Valka picked Hiccup up out of the cradle and handed him over to Dagur. "Careful, now. Support his head."

"I got it," said Dagur, holding the baby according to Valka's instructions. To Oswald's surprise, Dagur was not dropping or trying to hurt the baby like he had feared he would do to Heather.

Seeing that Valka had a handle on things, Oswald decided to talk with Stoick about something he had been meaning to talk to him about.

"Valka, would you mind watching the children for a bit?" Oswald asked. "I wanted to discuss something with Stoick."

"I don't mind at all," said Valka. Oswald handed his daughter over to Valka and she smiled and said to her, "Come on, Heather. Let's play with the boys."

While Valka played with the children, Stoick and Oswald went outside to talk in private.

"So, what is it you wanted to talk about?" Stoick asked.

"Remember the terms we included in the peace treaty? The one to make double sure our alliance holds?" Oswald asked.

"I remember," said Stoick. "Why bring this up now?"

"Because now you have a son and I have a daughter," said Oswald. "I think it might be a good idea to go through with it."

"Hold on," said Stoick. "Are you suggesting that we betroth our children?"

"It's to guarantee peace between our tribes," said Oswald. "It's good for the people."

"What about Hiccup and Heather?" Stoick asked. "You're expecting your own daughter to marry someone based on a contract. Someone she just met as a baby."

"You think I don't know that, Stoick?" Oswald asked. "I love Heather and Dagur with all my heart. But, as a chief, I must think about what's best for my people. Even if what's best seems unfair at the time."

"I just don't know," Stoick said with a sigh as he shook his head. "Hiccup is my first born. Right now, my only child. I'm just not sure I like the idea of forcing him into a marriage."

"Consider this, Stoick," said Oswald. "Both of our children have proud heritages. They both are descended from chiefs of two great tribes. Between the two of them, they could produce an heir that could lead both the Hooligan and Berserker tribes into a brighter tomorrow."

"I suppose you're right," said Stoick. Sighed and said, "Alright. I agree to the terms. Hiccup Haddock III will marry Heather Fireheart when they are both of age."

"Let's seal the arrangement in ink," said Oswald.

Oswald and Stoick went to the great hall and signed their peace treaty, along with a marriage contract. Neither of them felt particularly good about arranging for their children to get married so soon after they were born, but they agreed it would be best.

Before leaving, Oswald left his gift for Hiccup. It was a horn, similar to the one Stoick had given him for Heather. It was meant to be both a traditional chieftain gift to a new baby and a betrothel gift, a sign that he was to one day marry Heather.

-Berk, present day-

Stoick was stunned when Hiccup had showed him Heather's horn, the very horn that he himself had given to Oswald for his newborn daughter. In truth, he had always suspected that she was the same Heather, but he had no real way to confirm it. Hiccup had at first assumed that Heather was his sister, so Stoick corrected him and told him the truth that she was the daughter if Oswald the Agreeable. What he left out, however, was that Hiccup was more connected to her than he realized. Hiccup immediately left to tell Heather about her heritage, leaving Stoick to think on things.

"What's up, Stoick?" Gobber asked his friend when he noticed his guilty expression. "Something on your mind?"

"What makes you think that, Gobber?" Stoick asked.

"Well, for one thing, you've been awfully quiet for about an hour now," Gobber answered. "For another, you've got this kinda guilty look on your face. Did you and Hiccup have a fight before he left?"

"No, Gobber. Nothing like that," said Stoick. Stoick sighed and said, "It's just that certain things have come to light. And I'm concerned for how they'll effect Hiccup."

"What kind of things?" Gobber asked. Stoick was unsure whether or not to answer. "You can tell me. I promise I won't tell anyone."

"You have to swear that this stays between us," said Stoick.

"I swear," said Gobber, putting his hand on his heart and holding up his hook.

"I mean it," said Stoick, seriously. "Not. A. Word."

"I swear," Gobber repeated. "No matter what happens, nothing will make me reveal it unless you want it known. Now, would you tell me already? I ain't getting any younger."

Stoick let out a sigh and asked, "You remember Hiccup's old friend Heather, right?"

"I remember her," said Gobber. "Alvin forced her to work for him by holding her parents hostage."

"Well, as it turns out, those parents of hers adopted her," Stoick explained. "She's really Oswald's daughter."

"Oswald's daughter?" Gobber asked. "The one that disappeared years ago?"

"Yes," said Stoick. "I had always thought she was dead, so I never told Hiccup that..."

Stoick was unsure if he should say anything. Gobber could easily tell that his friend was not saying something.

"Never told Hiccup what?" Gobber asked.

"I never told Hiccup that Oswald and I arranged for him and Heather to be married when they came of age," Stoick said, guilt in his tone.

"You what?!" Gobber asked in shock.

"In order to guarantee that our alliance remained intact, Oswald and I agreed that if we had children of opposite genders, they would be married when they come of age," Stoick explained. "I'm not proud of it, but at the time it seemed like the best thing to do."

"Oh yeah, forcing Hiccup to marry a girl for political reasons was definitely the best move," Gobber sarcastically said.

"Gobber, we've been over this before!" Stoick said in a raised voice. "While a father does what's best for his child, a chief does what's best for his people."

"Even forcing him into a marriage he's been clueless about for his whole life?!" Gobber asked.

"That's just it," said Stoick. "I'm not sure what to do about it. I'm not even sure it still matters with the Berserkers, specifically Dagur, being our enemies."

"Well, you should at least tell Hiccup about it," said Gobber. "Dagur might find out and take advantage."

"You think I haven't considered that?" Stoick asked. "But how do I tell him?"

"I think the only way is to just be direct," said Gobber. "There's really no way to avoid him being at least a little upset."

Stoick sighed and said, "You're right. I'll fly to Dragon's Edge tomorrow and tell him. And whatever happens happens."

Author's Note: So, what did you people think? Be honest. But no flaming.