His expression softens. He's seen kids like this before, especially kids that have just experienced their first were change and they have no idea what just happened, like the proverbial rug has been pulled out underneath them. He's been there before, too, although, probably on a lesser scale than Steven. Still, Matt's got a rough idea of what to do.

He takes a step closer towards the couch and drops to his knees, and while he makes sure not to make any movements that are too sudden to startle Steven, and at this level, it's easier for Matt to have a firm grip on Steven's shoulders, at least to stop him from having a panic attack at the first instance.

"Hey, breathe." He's trying to keep the growl out of his voice, but god damn it, full moon is so close that it's probably going to bleed in one way or another. "With me? Okay. Calm down. You're going to be fine."

"Whoever she is, she's not going to find you, okay? The Sanctuary is safe enough."

... Yeah, he hasn't quite connected the dots that it's the Rose Queen that Steven is talking about, but he will, eventually.