User blog comment:IamJakuhoRaikoben/Chapter 513: Flower Circle, Review./@comment-7418318-20161205162009

"What's Irene's relationship with Acnologia?"

Or rather why didn't Acnologia recognize or acknowledge her in any way?

Surely as the former Dragon Queen he's got to have crossed pathes with her at some point. I can imagine that her magic would enable her to change or mask her true scent, but wouldn't that make her smell differently from Erza?