To be honest, it surprised Lilith that her father took a few days before confronting her in the library.
“Did you know?” he asked from the doorway. Lilith was inexplicably hit with the memory of when it was she in that doorway and Roseon the couch reading.
“I knew a lot of things,” she said.
“Did you know I was going to lose her?” The Doctor’s voice was sharp.
Lilith sighed and put down her copy of The Deathly Hallows. “Yes.”
“You knew I was going to be alone and you left anyway.” He stared at her, eyes harsh. “I seem to recall you saying something along the lines of ‘He’s never alone. Not while I have a say in things’.”
“You think I had a say?” Lilith laughed mirthlessly. “You think I had a choice?”
“You could’ve warned us, prevented it,” he growled.
“And caused a paradox? I get that this is hard on you, Dad, but it’s just as hard on me!” she snapped. “Because I know what she’s going through in that universe. You've convinced yourself that she's living a life she deserves but I know that she’s stuck there and utterly miserable. She's my—” Lilith seemed to choke on her words. “She’s my best friend and there’s nothing I can do to help her.”
The Doctor didn’t notice her mess up. “You pushed us together knowing that she couldn’t stay forever. You knew that she was going to be taken from me and you encouraged me to start a relationship with her!”
“'Tis better to have loved and lost than never to have loved at all,” Lilith quoted quietly. They were both silent for a minute or two. “Sometimes I really hate you.”
The Doctor frowned. “Why?”
“You’re the one who locked away all the adventures, all the stories, so that I couldn’t change the past. So many people died that I could’ve saved if you’d just let me remember.
“But on top of that, you didn’t take away my memories of the people I know. I had to be friends with Uncle Micks without letting slip who he was. I had to travel with Uncle Jack without him knowing he was my godfather. I had to go on an adventure with Aunt Sarah Jane without telling her that her son is one of my closest friends.
“Now I’m living on the TARDIS with Aunt Martha during the time she was crushing on you. Do you know how much it hurts to see someone you love look at you like you’re a stranger?” Lilith demanded with tears in her eyes.
The Doctor sighed and sat next to Lilith putting his arm around her. “I’m sorry. I shouldn’t have blamed you.”
“I’ve been expecting you to. I blame myself,” she admitted. “There are so many things I could’ve done to save you from all this pain.”
“And caused a paradox?” He echoed her earlier words and shook his head. “You’re always trying to protect me. I’m not made of glass, you know.”
“Thank Rassilon.” Lilith chuckled. “Who knows what trouble you’ve gotten in while I was gone.”
“Well, I almost drowned fighting the Empress of the Racnoss, was nearly killed by a plasmavore, had one of my hearts stopped when I met Shakespeare, got my companion kidnapped, a Dalek saved my life, was pretty close to being mutated, and I got possessed by a murderous and sentient sun.” He ticked the adventures off on his fingers.
“A murderous, sentient sun,” Lilith repeated. “Hold on, did you say Shakespeare? You met Shakespeare without me?”
Martha poked her head in. “Doctor? There’s an alarm going off in the console room.”
The Doctor jumped up. “Sounds like an adventure!” He offered his hand to Lilith. “Allons-y?”
Lilith beamed and accepted his hand. “Vamanos, Padre.”