Dumbledore clearly disagreed, but said nothing, changing the subject. "They are very sweet together," he said.
"Yes they are," Loki agreed. "It is a great pity that this is the first time that Harry remembers his father's love for him, for I watched them when Lily was still alive."
"Even through the Fidelius?" Dumbledore asked, surprised.
Loki grinned. "I created half the spells you use today," he said smugly. "I know how to counter them all, without destroying their integrity." His face darkened. "I even created the spell that killed my brother's mortal form and his wife. Truly, it is a cruel irony that a spell I created to give magicals the means to protect themselves from angry mobs was used by one of them to harm those I loved."
"You created the Killing Curse?" McGonagall asked in shock.
"A very long time ago," Loki said quietly. "I count it among the greatest mistakes that I have ever made, even if it was one made with the best of intentions." He sighed. "I have many, many sins to atone for, Professors."