[He listens a moment, and doesn't seem too perturbed by the fact that Vanitas knows about what happened when he was in the Organization, but when he hints that he knows about what happens to him, Axel tenses a bit. Certainly he figures that's no real secret, either, at least not to Xigbar or Xemnas, but when Vanitas says he knows everything he's ever talked to Sora about, something flares up angrily, indignantly, in Axel's chest. He might not be Sora's best friend, but Sora and Roxas are inextricably part of each other, and if Vanitas has done something to Sora then he's going to have to answer for it; Axel doesn't care how tired he looks.

[Before he even realizes he's moving he's taken to one knee beside Vanitas and snapped a hand out. He can't really gain any purchase on the creepy weird bodysuit the kid's wearing, so he'll settle to grab the boy's face, pinching either side of his jaw just enough to hurt a little and turning his head toward him sharply. His eyes are narrow and venomous as he speaks, though his voice is low and level.]

Is that so~? And just how do you know what I've told Sora, hm? Because if I find out you've done something to him, I'll make sure to drag your corpse through a second hedge when I'm done with it.