Percy doesn't really understand the whole 'age regression' thing, but he's here to support you anyway.

He understands the basics; It's a coping mechanism where you act younger than you are. That's what he thinks it is anyway.

"So, uhm, how was your day?" He asks, clearing his throat quietly as he awkwardly places a hand on your shoulder. Merlin, is he doing this right!? "Did you do anything fun?"