Heero and Quatre?
Actually, these two have the potential to form a really lovely yaoi pair, provided that Trowa's not in the picture. ^_^ Certainly Quatre knows he can depend on Heero - Heero's the one who brought him back to himself, after the traumatic events involving Quatre's father. Heero responds to Quatre's need with what could be construed as a kind of gruff affection. And there's definitely a connection between them - Quatre suffers pain when Heero is injured, and comments that Heero is, himself, "The Heart of the Universe."