This takes place after Iron Man 3.
...
Chapter Thirty One
One day, there was a knock on Tony Stark's door. He opened it to find a young girl, of about fifteen, standing there.
"Who the hell are you?" he asked. Not harshly, or anything, just in his, I'm an awesome rich playboy and what are you doing on my doorstep? voice.
"I'm your niece," the girl said, walking past Tony and entering the room.
"What? I don't have any siblings!" Tony said, following her. "And you can't just waltz in here like you own the place. I own the place. This house. It's mine."
"You're adopted," she said, relaxing back on the couch and putting her feet up.
"Even if this is true," Tony said. "You're not my niece. I can tell that you're lying."
"Would you believe that I'm your daughter?" she said.
He stopped to think about it. "While it's entirely possible that I have kids, you are not one of them." He pointed at the door. "Out. Now. Or I'll call the police."
"I'm not even real," she said.
"Really?" Tony asked.
"I'm a ghost," she said.
He gave her an exasperated look.
"I'm a figment of your imagination."
"Really? You couldn't come up with anything more creative than that?" Tony waved to the door. "Out."
"I'm a time traveler," she said.
"Really?" He rolled his eyes, but when he looked back, she was gone.
"And I'm not even really here," she whispered behind him.
Tony spun around, looking at his empty house. He was about to call for Pepper when he realized that she was on some trip somewhere.
He was alone. Maybe.
...
Later that night, Tony awoke from a dream and walked downstairs, hoping to get some milk. He passed his living room, and spotted some lights. Did he forget to turn the TV off?
He popped his head in the room and the first thing he saw was movie Titanic. The second thing he saw was the girl, sitting in his chair.
"What are you doing in my house?" Tony demanded.
She was crying. "I'm watching Titanic," she said, sniffling. There was a pile of tissues next to her on the couch.
"That's it," Tony shouted. "You get –"
The TV went off. The girl was gone. The tissue pile was nowhere to be seen.
"Out?" he finished.
He was looking into a dark room. There was no one there.
What the hell is going on? Tony thought.
...
"Hey, Tony?" a voice said. "I can't sleep. Will you read me a bedtime story?"
"Whaa? Yeah, sure...wait a second!" He sat up straight in his bed, all clues of sleep scattering. "Get out of my house!"
"I'm not in your house," she said.
"What? Yes you..." She was gone.
He sighed and laid back down on the bed, putting his hand to his head. "I must be dreaming." He closed his eyes and relaxed.
"What're you thinking about?" a voice said beside him.
The girl was sprawled next to him (very paint me like your french ladies like), with her head supported by one arm.
"Ahhh!" Tony yelled, scrambling away from her. "What are you doing?" He turned his head and grabbed the lamp next to him. He turned back to look at her, armed with the lamp. "Huh? Where'd she go?" he asked himself.
"I'm right here. Boo!" she whispered in his ear, behind him.
"Ahh!" he yelled again, dropping the lamp.
Before it could hit the floor and shatter, it was caught by two hands.
"You need to be careful," she said, giving him a wide smile. "Don't want to break this. It's ceramic."
She put it back on the nightstand.
"Who are you?" he asked.
"What kind of foolish question is that? I am who I am and I am who I was and I am who I will always be!"
"That's not an answer," Tony said.
"Well, what other answer is there? It's the only answer worth giving!"
"How about your name? That's another answer," Tony responded.
"Yes, it is, but it's not worth giving!"
Tony put his hand to his forehead, rubbing it and wondering how he managed to get in these situations. "Look, I have no idea what it is you're referencing - because I know a reference when I hear one - but it's way too early in the morning for this..."
He trailed off as he looked back up to his empty room.
"Oh, come on!"
Shaking his head, he climbed back into bed and shut off the lights. "Just go back to sleep, Tony."
"Just go back to sleep."
...
If you didn't get the reference... add this to = watch?v=Kwt7Eol-_6Q