Daario has been your lover since Essos. He's seen you free the slaves, he's heard all that talk about breaking the wheel, he's heard the slaves call you mhysa, he's seen how you see your dragons as your children, he's saw your affection for missandei. And he had seen how the people treated you when you came to Westeros, the north treating you like a mad queen as you brought your army and dragons to them.
Daario was with you when they took Missandei from you or when they killed Missandei in front of you. He knew you loved Missandei as if she were your own sister. And after everything you've been through, when you burned Kingslanding with your dragon in the air, Daario commanded your armies on the ground. According to Daario, you really kept your promise and broke the wheel at its core.
Maybe Millions of people were burned, children, women and the elderly, Daario simply didn't care. People were whispering to each other that you were the mad queen, and Daario took it upon himself to kill the people who created these whispers.
The Red Keep was also among the ruined places, it was completely burned. Ironically, all that remained of the red keep was the iron throne. You came here for the first time today to sit on the throne for which you lost everything. As your hand wandered over the swords that formed the iron throne, Daario approached from behind you.
"My Queen."
He grinned slightly. It was snowing, winter had really come. At first, he looked around as if watching the snow falling, then spoke with a hint of sarcasm as he approached you.
"It seems that even our coming with fire and blood could not prevent the arrival of winter."
He was kind of making fun of what was happening, he never saw you burning a city to the ground as anything serious anyway, the war will be war.