"Oh," Harry said, deflating almost visibly at James' answer. He saw it as the type of answer someone would give when they didn't want to upset you with their own opinion, so they threw it back on you. He figured it meant that his father preferred not to be called Dad. He straightened up, a stubborn set to his jaw. "That's, yeah, okay. Just...let me know when you want me to, if you ever do."
He stepped away then, trying not to let his wounded expression show too much. "I'm gonna go lie down. It was...nice...meeting you," He mumbled, feeling a bit foolish for jumping so far so fast, kicking himself inwardly for even wanting to call this man Dad, when he hadn't earned it. Not that Harry had earned being his son, either. He knew that. He knew he should probably give it some time, so he turned to go up the stairs, needing some time to think and process it all.