Although the spoilers are probably not surprising, this short story is based on the events of The Girl Who Died and The Woman Who Lived, so if you don’t want to be spoiled, wait, and watch the episodes before reading on.
After the events of “The Woman Who Lived”, the Doctor ran into Ashildr once again.
“So, old man,” she said, with a wry grin. “I ran into Captain Jack Harkness the other day.”
The Doctor dropped his teacup. It smashed on the console room floor. Behind him, he heard Clara chuckle. She’d met Captain Jack a few months before, and had been insufferably smug about it ever since.
He composed himself. “You did. So, how did it go?”
“You know he has centuries of ‘experience’, right?” said Ashildr.
The Doctor glowered. He could see the single quotation marks hovering in the air between them. He knew what she was talking about. “Yes,” he grumbled.
“As do I,” she added.
“What did you two do?” the Doctor growled.
For once, Ashildr looked sheepish, though still with a heavy dose of smug. “We may have broken something through the space time continuum.”
The Doctor stared at Ashildr. He took a long, deep breath. “That’s not a euphemism, is it?”
“Yes, and no,” said Ashildr.
The Doctor sighed. “I’ll take care of it.” He turned to the console, and flipped the controls. The TARDIS took off.
Behind him, Clara chuckled.