"Memory"
Clara didn't have the best memory. She might forget where she put her TARDIS key every once in a while, or misplace her favourite cookbook. Those things happened to everyone! She was, after all only human. And humans forgot stuff. (Not that aliens didn't. especially her alien.)
Clara forgot those types of things on occasion.
But she never, ever, forgot The Doctor. Didn't forget his silly grin, or ridiculous fashion choices. Didn't forget the way he hugged her, so tight that it felt as though she'd be crushed, yet she never felt more loved.
Those memories were hers.
After he carried her out of his time stream on Trenzalore she felt as if the whole of the universe had decided to fill up her head. It was horrifying. If The Doctor hadn't have been there she would've died.
But he had been there.
He held her as the plethora of memories assaulted her mind, making her scream and writhe in his arms. He comforted her with words in a tongue so beautiful it sounded like music. He was there for her through everything. Even when he passed out from exhaustion he never let go of her.
And eventually she was there for him.
Apparently being in your own time stream was exhausting.
The Doctor slept for the better part of two days. Clara stayed with him every second, because he would do the same if she was the one lying unconscious.
When he did wake up Clara hugged him like she would never let go.
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