He essentially subverted the gag. Now it's a surprise when people DO actually see them as a couple instead of just siblings or whatever.
Papa, mama, thank youSay thanks to this future papa and mamaDo something good to receive something good in return...was what Kumada thoughtN-No problem, it's okay, I want to become a mother someday!Ah sorry, do you not have that kind of relation perhaps...?Papa and mamaCome on, thank them