(Not sure there's really any shounen ai here, but another overlooked dude)

Shine

In all my travels through these bad lands there was never such a person.

He was protecting a child who was really old, while he was just a goofy kid who was somehow a man.

He waved that gun around like he didn't know what it really was, all the while being a mind-blowing marksman. He laughed while bleeding half to death, not for bravery but because that was in his essence.

So much brightness that even I wanted to touch him, that I who would kill anything just had to let him live.

Shine on, you crazy diamond.

(Last line courtesy Roger Waters/Pink Floyd)

Note: B.D.N.'s POV about Vash