He'd kind of been hoping for her to move on from the subject, but she doesn't say anything. Like she's waiting for him to continue.

He turns back to Mrs O'Leary for a moment, patting her on the side. "Outside, girl." Percy watches her leave, before running a hand through his hair and turning back to Annabeth. You need to stop hiding things from me.

It hadn't been hiding, not really. He thinks. "Okay, this is really dumbly involved for something that's so small, but it's not a big deal or anything, I promise. I just - you remember how I disappeared after Mount St. Helen's exploded?" He pretty sure she does, but it's the first thing that comes to mind.