I'm not sure if there is such a fanfic specifically. Fanfiction can cover a wide range of scenarios, but this particular one might be a bit controversial in the context of the 'How to Train Your Dragon' fandom. It could exist in some corners of the fanfiction world, but it's not a common or widely known plot that I'm aware of.
In 'foolish x eret fanfic', the fact that they both exist in the same fictional universe gives a lot of room for creativity. Writers can explore their backstories, how they met, and what their future could hold. Their interactions, whether it's friendly banter or deeper emotional exchanges, can be really engaging for readers. Also, the fanfic can introduce new scenarios and adventures that we might not see in the original content, which is always exciting.
I'm not sure exactly which 'foolish x eret fanfic' are popular. You could try searching on some fanfic platforms like Archive of Our Own. There might be a variety of stories there written by fans.
If such a fanfic existed, it would probably shock a lot of fans. The relationship between Astrid and Hiccup is quite iconic in the 'How to Train Your Dragon' series. This would change the perception of Astrid's character and also add a lot of drama to the fan - created narrative. It could also lead to a split among fans, with some being interested in this new, darker take on the relationships, while others would firmly reject it.
A son born from a concubine was not a legitimate son. A concubine's son referred to a son born to a concubine, while a legitimate son referred to a son born to a legitimate wife. The status of a concubine's son was lower than that of a legitimate son. Generally, he could not accept the sacrifices of the ancestral temple and inherit the status of his father and grandfather. Therefore, the son of a concubine did not have the status of a legitimate son.
Di son and eldest son were two different concepts. The eldest son was the oldest son in the family, regardless of who his mother was. A legitimate son was a son born to his wife, or a son born to his wife, but his status was slightly lower than that of a son born to his wife. In ancient China, the legitimate son had priority in inheritance, even if he was not the eldest son. The status of a legitimate son was higher because he had the priority to inherit the family property. The status and inheritance rights of the eldest son and legitimate son were determined according to the specific situation.
"Medicine Fragrance Di Daughter: The Prince Obediently Conforms." I recommend a novel similar to this one called "The Most Concubine". It tells the love story between a black-bellied female protagonist and a big-bellied male protagonist. It's a light-hearted favorite novel. I hope you like this fairy's recommendation. Muah ~😗