A Yamamoto/Gokudera arc in which Yamamoto decides Gokudera could really use someone to take care of him since he doesn't seem to attend to that at all himself.

' "What," Hinata says, "like you're suddenly going to become a kabedon master?" The idea itself is hilarious. Kageyama has all the timing and subtlety of a tyrannosaurus in a china shop. Hinata sees no reason to be wary. "We'll see," Kageyama says darkly. "We'll see." ' -- When Hinata introduces Kageyama to the concept of kabedon, he isn't expecting to create a monster. But all origin stories have humble (sometimes very humble) beginnings...