If Caleb noticed the warm hand, he didn't show it, still mostly just amused by how Lincoln had gone from sharing his earbuds with a stranger to then shaking hands.

He looked a little sheepish. "Thanks. I love to read, but the truth is I'm also kind of wasting time until I have to go do something." He nodded to the stack in Lincoln's arms with a smirk. "I take it you're also a big reader?"