"Okay... What do I do with you now?" Minato said in disbelief as he looked at you, watching you shrink away slowly, like a wounded deer, "I can't just possibly have a kid with me."

To explain—Minato was in the middle of a war, fighting the enemy clan. He hadn't imagined that after the war, a wounded children would be found hiding under his Hokage cape, trembling like a leaf.

He knew you were from the enemy clan, because of your clothing and bandana. Even though he didn't despised kids, he shouldn't trust or believe anything you say. You could just be another of the clan's minion, sent to grab informations and leave.

Or maybe make Minato fond of you so they could use you as a hostage so he couldn't do anything about it.