Kanan is still distrusting and suspicious of the clone. Maybe he sees him teaching Ezra something and gets angry and offers to spar thinking he can one up the old guy. Turns out Rex can keep up just fine and is annoyingly good at brushing off his snarky, only half in jest mean comments.
Bring on the unexpected sexual tension!
+1 for hand jobs in a corner of the ship
++ Kanan reluctantly growing to gradually accept and like the old soldier and appreciating the outlet for stress relief
+++ Rex complimenting Kanan about being a good Jedi or being just as worthy of the title of Master as any General he even fought under
SWR Kanan/Rex, angry sex
Bring on the unexpected sexual tension!
+1 for hand jobs in a corner of the ship
++ Kanan reluctantly growing to gradually accept and like the old soldier and appreciating the outlet for stress relief
+++ Rex complimenting Kanan about being a good Jedi or being just as worthy of the title of Master as any General he even fought under