I'm guessing 'Junior' is secretly a softie and I think that dynamic can work (i.e. a failure and someone who tries to keep them in line but indulges in their behavior every now and then).
Like it seems a little too.. convenient that a girl who's basically the same as Yotaka shows up and is seemingly trying to keep her out of the blue on why she's there for as long as possible (i.e. getting her drunk)
Little theory but maybe Yotaka takes her under her wing to make sure she does NOT end up a girlfailure, like a big sister keeping her younger sister from taking the same dark path.
I see them more as siblings/drinking buddies if anything
Hoping this doesn't turn into a big love triangle thing but the Yani Neko illustration was really neat
I'm also really glad Chu was allowed to live but I hope he isn't gone for good he seemed fun.