The 10th Doctor put his cup down and his hands in his pockets as he looked steadily at Aderyn "I won't either, so you might as well tell me."

"Tell you what?" Aderyn frowned.

"Who you are."

Aderyn smiled "I am Aderyn Oswin Tyler."

The 10th Doctor beamed. What he had seen in her eyes had been right. That familiarity had been justified "Little Addy."

"Not so little anymore. I had a growth spurt." She smiled and added quietly "And regenerated a couple of times."

"Hang on," The 10th Doctor frowned "Regenerated? Tyler?"

"Daughter of Rose Tyler and the Doctor." She said.

"No you're not." The Doctor said suddenly.

Aderyn continued to smile. She crossed her arms, amused, as she watched the Doctor pace around her.

"Aderyn doesn't like Clara so would never have been nice to her. You knew too much about what was happening," He suddenly grabbed Aderyn's hand, looking down at the band on her ring finger "Aderyn never wears her wedding ring. It's not even the same ring. Who are you?" He let Aderyn's hand go.

"I am Aderyn Oswin Tyler," Aderyn said slowly "But not the one that either of you know. I know you both. But right now neither of you know me. I am from your future. A future where you're no longer then man who regrets or the man who forgets. And I got remarried."

"Then why are you here?" The 10th Doctor asked.

Aderyn's eyes filled with tears "To make sure you did the right thing. I pulled a few strings and was allowed to partake in one last request."

"Who's last request?" Clara asked soothingly.

"Mine." Aderyn said in a hoarse whisper.

"Addy..." The Doctor started.

Aderyn held up her hand "Spoilers. He might not remember," she nodded at the 10th Doctor "but two you will. Fixed points shouldn't be messed with. You taught me that the hard way...or rather, you will teach me that the hard way. The very hard way. And soon I think. Well I say soon. It feels like years ago now. It'll be a few years from now that lesson will be taught. Just don't be offended when that lesson isn't kindly received."

"But haven't you just changed a fixed point?" Clara asked.

Aderyn shrugged "Theoretically speaking yes. But at the same time no. Either way, Gallifrey is no longer there and the Daleks were destroyed. I've not so much changed a fixed point as found a loop hole. But I won't find out for definite until I get back."

The 10th Doctor cleared his throat "Speaking of getting back, I should probably be off. But where is it we're going that you don't want to talk about?"

"I saw Trenzalore, where we're buried. We die in battle among millions."

The 10th Doctor frowned "That's not how it's supposed to be."

The Doctor shrugged "That's how the story ends. Nothing we can do about it. Trenzalore is where you're going."

The 10th Doctor smiled suddenly "Oh, never say nothing. Anyway, good to know my future is in safe hands. Keep a tight hold on it, Clara."

Clara hugged him "On it."

"And fly high, Little Bird."

"Always soaring." Aderyn whispered as the 10th Doctor hugged her tightly.

He pulled open his TARDIS door "Trenzalore. We need a new destination, because I don't want to go." He closed the door behind him and the engines groaned into life.

"He always says that." Aderyn smiled.

Clara could feel the tension between the Doctor and Aderyn. It had been quite a revelation. She cleared her throat politely "You both clearly have stuff to discuss. I'll leave you to it. Oh, by the way, there was an old man looking for you. I think it was the curator." She ducked into the safety of the TARDIS.

The Doctor and Aderyn sat on the bench, both looking up at the painting.

"I could be a curator. I'd be great at curating. I'd be the Great Curator. I could retire and do that. I could retire and be the curator of this place." The Doctor said. Aderyn chuckled lightly and they both jumped when they heard someone approaching.

" You know, I really think you might." They both looked round to see an old man walking towards them. Aderyn nodded and smiled at the man. The Doctor stared at him opened mouthed. Had his face been slimmer, his hair dark brown, give him a long coat and a long scarf and the Doctor knew he would have been staring at himself.

"I never forget a face." The Doctor smiled.

"I know you don't. And in years to come, you might find yourself revisiting a few. But just the old favourites, eh? You were curious about this painting, I think. I acquired it in remarkable circumstances. What do you make of the title?" The Curator said.

"Which title? There's two. No More or Gallifrey Falls."

The Curator leant heavily on his cane "Oh, you see, that's where everybody's wrong. Except your young friend here. Do you know the title?"

"It's all one title." Aderyn said "Gallifrey Falls No More."

"Now, what would you think that means, eh?" The Curator said, looking pointedly at the Doctor.

"That Gallifrey didn't fall. It worked. It's still out there." The Doctor guessed.

The Curator's smiled broadened "I'm only a humble curator. I'm sure I wouldn't know."

"Then where is it?" Aderyn asked.

"Where is it indeed? Lost perhaps. Things do get lost, you know. And now you must excuse me. Oh, you have a lot to do." The Curator said.

"Do I?" The Doctor asked.

"Indeed. You both do." The Curator nodded.

"Is that what I'm supposed to do now? Go looking for Gallifrey?" The Doctor asked quickly as the Curator turned to leave.

"Oh, it's entirely up to you. Your choice, eh? I can only tell you what I would do if I were you. Oh, if I were you. Oh, perhaps I was you, of course. Or perhaps you are me. Congratulations."

"Thank you very much." The Doctor shook the Curator's hand.

"Or perhaps it doesn't matter either way. Who knows, eh? Who knows?" They watched the Curator leave before they both sat down again.

"So how far in my future are you?" The Doctor asked.

Aderyn shrugged "I forget. Time passes so strangely these days. But of course time isn't a straight line."

The Doctor chuckled "It's a ball of wibbly wobbly timey wimey stuff."

"Exactly." Aderyn said "But my job here is done. And I need to head back."

"How?"

"I'm going to get picked up. But if you wouldn't mind dropping me off, that would be brilliant." Aderyn stood.

"How has this even been possible? Aderyn, I mean you, don't have two time streams anymore." The Doctor stood as well.

"Your Aderyn isn't in her own time stream. We swapped places. I let her know the situation and she kindly agreed. Though she is currently discovering what the TARDIS library has in store in the future."

The Doctor smiled and slowly started to walk back to the TARDIS "You always did like the TARDIS library. What am I like where you're from?"

Aderyn shrugged "Different."

"Is that good or bad?"

Aderyn shrugged again "Just different."

Aderyn set their destination and while they travelled, she and Clara spoke happily. The Doctor knew that Clara would have issues when they next saw their Aderyn. Their Aderyn still didn't like Clara. But for now, it was so nice to see them getting along. When they finally landed goodbyes were short. The Doctor and Clara watched from the TARDIS door as Aderyn walked up to a figure in the distance. Neither of them could see who it was. But they both saw when the figure held out their arm, Aderyn took it and the two of them disappeared.