Metzger'd probably throw jobs Peter's way if Quill were willing to roll on a competitive suppler or two. If they can attain some level of cooperation in that regard (what he and Cage are angling for on the test drive) then he's probably pretty tolerant of Peter being Peter.

IF NOT they are probably thorns in each others sides and Metzger is the sort to throw salt in his game on the regular. Sabotage, suspiciously coordinated pirate attacks, thinly veiled death threats, etc.