Wait what if Deaf!Snotlout and Deaf!Hiccup.
Hiccup was born with shit hearing and it just gets worse with age. Born early, hearing canal never formed or whatever idk he just got shit hearing.
Snotlout loses his hearing from the multiple lightning strikes (I LOOKED IT UP OK).
When it happens, it's the one time that Hiccup is the one that can be near Snotlout.
He just sits down next to him, and writes I Know on the ground in front of Snotlout.
Because he does. He's HoH too, almost dead by the time rtte happens, and Snotlout is 13 and scared, and Hiccup is 13, upset for his cousin, and the only one who can comfort him.
Their arguments are no longer loud like they would be in canon.
They're quiet and full of hand motions in their own made up language (they made their own sign language to talk to each other - the adults are confused by it, Spitelout hates it but Stoick and Gobber think it's Great and kind of adorable they have their own secret language now), and they both let out frustrated noises but without words.
The implement the "hand language" (as Stoick called it once) with the riders.
It's the most used language on the edge during missions.
Viggo has spent way too long trying to decode it.
Krogan tries too.
Johann had no idea that was a language he thought the 2 were just flapping their hands at each other. Krogan is pissed Johann had no idea because they could've cracked their language because of him.
