They actually interact a lot more than you'd think throughout the manga, usually when Kurita feels she has to see Yuzan to help Yamaoka, who's in a pinch, and can't find the solution/answer by himself.
I think this chapter starts a point where the role division between Yamaoka and Kurita becomes clear: Yamaoka is the brawn (since he's the one who cooks all the time), and Kurita is the brain (with her surprising insights and clever mastery of words that can sway people like even Yuzan himself).