Each time Hibari and Tsuna Drift their eyes are opened to each other in new ways.
Tsuna sees Hibari's struggle as a child, his inability to be what his parents want, his inability to connect with other children so much weaker then him (He's predator- they're prey.). Tsuna sees Hibari get attacked by the older children for being different, sees the exact moment Hibari decides that if the adults will do nothing he will, sees that very first uttering of 'I'll bite you to death' (because he's small, only a child and of course he was only playing it's not a threat- and by the time anyone who could have stopped him figures out that's not true it's too late, Hibari rules as the only Carnivore in the town) sees the way Hibari slowly takes over all of Namimori one section at a time.
Hibari sees Tsuna so young but so much better than he was, and then an old man poking his forehead. Watches as after that Tsuna begins to trip and fall, as his grades begin to slip lower and lower because the boy can't focus anymore. Watches as Tsuna struggles with a mother who loves him, but never seems to truly focus on anything but a father who is never there.
Hibari watches as the children around Tsuna begin to hurt him, that first uttering of Dame-Tsuna, can feel the hurt because Tsuna's trying, he is but something is wrong. Hibari watches the nickname stick, but Tsuna keeps moving forward, keeps trying until the day his own mother utters 'I guess you really are Dame-Tsuna Tsu-kun' and he can feel as Tsuna cracks inside because if his own mother thinks he is no-good what's the point?