User blog comment:Miskos3/Fairy Tail 522 & 523: Gray's Trump Card & Is Destiny Burning, Review/@comment-24499036-20170218095333/@comment-7418318-20170218103740

That looks more like a sadistic smile than one caused by a happy memory. He's probably thinking of using Cana to make Gildarts give up or somesuch.

Or we'll get the shocking reveal that August is really Zeref's daughter. :P