Brian & Justin on a deserted island

[seawithin]

I'm looking for a fic that had Justin and Craig's Cessna crashing into the sea, and Justin ending up on a (seemingly) deserted island. (I think it was implied that Craig died.) Soon Justin finds out he's not alone - while looking for water, he first encounters a friendly dog, and then its hostile owner, Brian. Justin tries to make contact, but Brian threatens him with some sort of handmade weapon.
This was a WIP and the last chapter I read had Brian tentatively letting Justin get closer. He would leave him food and allow his dog to spend time over at Justin's improvised shelter. Oh, and - both Brian and Justin are teenagers.

Thanks in advance!

EDIT: Found thanks to its_french ! 
"As We Know It" by morriganblue