I'm sure Brain would LOVE that... especially if done by Pinky.
Who do you reckon is the top in the relationship?
Is Brain secretly submissive? Does he want to be ruler of the world, but be Pinky's bitch in the bedroom?
Or is Pinky just the sub all the way? I mean you can see him in tutu and whatnot, maybe it's humiliation gear that the Brain makes him wear? Maybe WB just thought it was too distasteful to show him in leather gear?