Peter sort of freaks out. It's less a freak out and more just jumping out of his chair because HEY he thought he was alone, but if he had more energy he'd probably be crab walking up one of the walls. But nah, he just stands there for a second before realizing that this weird dude isn't a threat, and awkwardly lowers himself back into his chair while he listens to him. And uh. Then rubs at his eyes a bit because he'd kind of just been crying his little eyeballs out a minute ago, and he doesn't really want some stranger seeing him all upset and shit.

It was a little too late for that, but you know.

"...I-- okay. I know that all that stuff you just said was like, super profound and I should probably like, take it to heart or something? But what the Hell. Did you just read my mind, dude?"

He'll get back to focusing on all the important emotional stuff in a minute, right after his mind is done being blown.