[Of all the explanations Sabo could have given, that's the one Sanji was expecting the least. They all had known about Ace, had met Ace, just as they had met Garp, had heard about Dragon. He knew Luffy's family was nothing conventional, that it was mostly built on bonds and was something their Captain only spoke of when it was relevant or necessary.

Honestly, it doesn't surprise him that there's another brother. With how the guy befriends everyone, wears his heart on his sleeve, and binds even the strangest of people together... yeah. Sabo being Luffy's brother doesn't surprise him in the least.]

Dressrosa, huh? [Unlike the slightly threatening tone he'd had just a few seconds ago, Sanji's tone is lighter, easier.] If Luffy let you get through that mess with Ace's fruit, you must be someone he wanted to have it.

[With a grin, he leans forward, taking full advantage of Sabo's lit hand to light his cigarette and take a drag.]

So. His brother, huh?