They didn't go straight to the mall. After some bribing at the bar that night, Anastasia learned of a group of escaped slaves hoping to move into the Lincoln Memorial, so they headed out to inform them that they would clear out the ruins (for a minimal fee, of course).
They finally arrived at the memorial a day behind their schedule, and Charon was itching to kill. One of the salvers invited Anastasia inside to talk to Leroy Walker, the head slaver, about certain missing slaves, but they instructed Charon to stay outside. He killed all the slavers on the outside, then slammed the door open to find Anastasia looting the bodies of three more dead slavers. She grinned at him.
"How about dinner?" she asked, motioning to a table, set for three with Nuka-Cola and noodles.
They ate it all.
After burning the bodies, they decided that that night they would stay the night in the slaver's meeting room, as it was very secure and nearby for when they de-booby trapped the place the next day. They avoided the subject of the single mattress until after night fell.
"I'll sleep on the floor."
"Nonsense, Charon." Anastasia objected. "If anything, you'll sleep in one of these chairs."
He fell asleep on the mattress while she was reading a book on Lincoln she'd found on the shelves.
The chair broke.
"Move over." She whispered to him, and he groaned, rolling over in a haze. She curled up next to him, and neither of them said a word.
The next morning his arms were around her waist, and he was cradling her close to him, her head resting in the crook of his neck. They parted hastily and got to work.