I think about Hiccup having to reassure a very guilt plagued Toothless a lot. Having to remind him that he doesn’t blame him, that its not his fault. That he still loves him. That he doesn’t think he’s a monster.
He never listens. And when he does, it’s always with this disappointed scowl, like someone skimped on the meat in his sandwich. (imitating) ”Excuse me, barmaid, I’m afraid you brought me the wrong offspring! I ordered an extra-large boy with beefy arms, extra guts and glory on the side. This here, this is a talking fishbone!”