"And if you don't, I will hunt you down and harass you until you tell me," Tony said, sounding serious and solemn. It was Tony. Maybe he meant it. Maybe it was him being silly. It was never a known sentiment with Stark. Especially learning to accept this that they were sharing and that he hadn't really known before.

"Even if you had said otherwise, I mean it. No matter what happens."

Tony had faced his mortality and he knew there was a chance he wouldn't come home one day. He wanted Arthur to know then he still had a home there.