Harry was coming back completely freezing from the attack with the Aurors and was really looking forward to getting into a warm bed. It was his last action with Aurors; Draco was too worried about him and talked him out of taking part in dangerous interventions. He knew Draco would be waiting for him. He never fell asleep when Harry was in action. He opened the door and saw a touchingly beautiful sight: Draco was sitting in a chair in the living room, baby Scorpius sleeping on his lap.
"Hi, I'm home," Harry whispered, kissing Draco's cheek.
"You're cold," Draco smiled.
"Yeah, I'm freezing. How come Scorp isn't in the crib?"
"He didn't want to go sleep until you got back. Harry, this really is the last time, isn't it? Will you never leave us alone at night again?"
"Never again, you don't have to worry," Harry promised. He could feel himself slowly melting, not just from the warmth of the fireplace and Draco's embrace but mostly from the wave of love that washed over him.
