Legilimency was the first thing. He had her practice on him, and even her mind was gentle and soothing. She learned so many things about him- his childhood, his father, his friends. His mental shields blocked the things he was ashamed of showing her, most notably about his sister and Grindelwald. It wasn't long, though, before he showed her that too. She clasped his hands in her own and told him that his mistake would not define him, and he still had so many years left in him with which to make amends.