You know, when you think about it, it's somewhat impressive that he just keeps his tsukkomi machine gun firing as each girl shows up yelling closer and closer to his face. Kana is basically at kiss range, Aya even closer, and he doesn't get flustered at all. Sasuga Sou-sama, desu wa.
About the supposed denseness: even the niconico japs, who normally shitpost and spam about it even on completely unrelated pages, barely wrote anything about it this time, come on.