[For a moment, Raihan honestly looks baffled. What's a selfie? What's a selfie? How can someone not know?

Easy there, he thinks to himself, and he visibly relaxes. If she doesn't know, then he'll just how to show her!]

It's when you take a picture of yourself. [As if on cue, Rotom flies to Raihan's hand, and he lifts the phone to take a quick selfie with a thumbs-up and a smile.] Like that! [With a bit of scrolling, he turns the phone around to show her the selfie he just took.] There's a bit more to it than that, but that's the gist of it.