Vax had meant that he and Percy had shared drinks in Vex's honor. It didn't cross his mind that Steph may have taken away a very different interpretation.

He was well focused on attempting to answer her question, anyway. His expression warmed all the way down, and he quirked the first of a smile, giving her a funny, speculative look. "No," he told her outright. "You definitely can not be my sister. That would be...too weird."