'Hey, Luffy, ' Law asked the youngest of the four, 'How do you always seem to know where we are? '

'I was curious about that too, ' Sabo muttered as he cut into the cooked boar over the fire.

'Yeah, you were never able to do that before a few months ago. ' Ace commented, narrowing his eyes.

'It 's called Haki. ' Luffy said, drooling over the cooking meat, 'I can teach you guys if you want, Shishishishi! '

'What 's Haki? ' Sabo leaned forward.

'Well, there 's three forms! I can teach you and Law two of them. ' He said.

Law frowned, 'Why can 't you teach us all three? '

'Why can Ace learn them all? ' Sabo asked, pouting while Ace smirked.

'Well, you have to be born with this type of Haki! ' Luffy said cheerfully, 'I know you don 't have it, Sabo, but Law could. Right now, Ace is the only one who can use it, though. '

'Ha! ' Ace smirked, pride in his gaze.

'Well, what does it even do? ' Sabo stuck his tongue at his older brother.