Imagine this being Fili and Thorin’s thing. But then Kili gets old enough to be taken and Fili gets kind of jealous and possessive of Thorin
It makes him resent Kili a little, because this was *his* time
Poor baby, he’d probably get so fed up that one round when it was time to go he’d pretend to be sick; so he didn’t have to spend the whole day being annoyed and scaring the fish away,
And then while they’re out Kili makes a comment about how it’s nice that it’s just him and Thorin, without Fili being cross at him
Thorin goes ‘…oh…’
So he’d start taking Fili again, just them and he’d compensate by taking Kili hunting to teach him to use a bow
'Look at the delicious meal we have tonight thanks to my wonderful nephews'