Wait, what? That last panel doesn't make sense to me...
Maybe the translation is weird, but the idea is that he's not picking any of them, so that they're both forced to bring him items from the Outside World and keep him interested to keep his interest.
Wait, what? That last panel doesn't make sense to me...
That's because the first part is mistranslated.
Updated
Really.Say something!It's fine.This person is scary!!A day at Kourindou 6I will personally source the goods from the Outside World to Rinnosuke-san myself,so you're excused.But it's impossible for you to comprehend the youthful taste in goods that is unique to female high schoolers, no?W-Wait... Please calm down.You bi—!And so, Rinnosuke-san! Who will you choose to source your goods from now on?So long as the both of you keep bringing items from the Outside World to me, it's fine.