Stiles just gave him a grin in return for that scowl. He was going to make a comment that if he kept making that face, it'd get stuck. But he bit the inside of his cheek, because that really was his default expression so maybe it did get stuck. Which, honestly, wasn't true. Derek had a fair share of expressions that weren't a scowl. Like, five. Maybe. Stiles hadn't counted.
He'd tucked his hands into his hoodie pockets, tilting the back of his head against the wall of the elevator. He was quiet for the ride, thinking more on Richard Siken poetry about a boy with green eyes than the last time they were in an elevator together. The elevator reached the ground floor and Stiles stepped out first and winced, yelping at the smack to the back of his head. He turned his head to protest then Derek said that he knew what that was for and Stiles huffed.
"You act like a big, bad wolf, but you're really just a fragile flower, you know that?" Stiles said, arching an eyebrow at Derek. He headed toward the front door, pushing it open and pausing to hold it for Derek, then once he was past the door, led the way outside and to his baby.