Heh heh... well, Juubei is Kazuki's servant. ;) I'm personally very supportive of Kazuki calling all the shots, but yeah, in fandom it mostly is Juubei on top. Either way, they're so married. And awfully popular - I think there's more doujinshi for the two of them than Ban and Ginji.

And huzzah for canon! I just bought and marathoned the third DVD - the IL arc is even better than I thought it was, now that I can actually see it on something other than my slow computer. ;)