Until the day Kazran was big, nearly her age, grown into almost a man, blushing and retiring. Beautiful. That Christmas, Abigail asked for something special: To be a ghost of Christmas Present. Three left, that time; their fifth Christmas, the three of them. She stood outside her family's house, weeping in the snow, as the Doctor watched. He recognized her sister, from when she will be older and more heartbroken. Kazran came and she took his hand. For a moment, she caught him blushing. And then who should appear in the window but the Doctor, ushering them in from the cold.
Abigail told her family their secret -- how every Christmas Eve she was free, for the night -- while the Doctor tried and failed with magic tricks for the younger ones. The family was suspicious of Kazran, though she swore he wasn't like his father, that he would not be. The Doctor heard, but pretended not to listen, and prayed that she was right. They begged her to stay for Christmas Day, but she didn't have enough left. So the sister held Christmas that Eve. Her sister wasn't sure: Hadn't she seen him, around the town sometimes, without any friends? Not yet part of the story? Walled off by old Sardick, under a tamed sky? "He's got me," she said proudly, and under the table she took his hand. And when it was time to lock her up again, Abigail told Kazran goodnight.
Scrooge remembers 1952, a pool party at Sinatra's. Abigail stood by the pool and Kazran came running, in tux and bowtie, when she finally decided to tell him what it meant. How many Christmases she had left. He kissed her, desperately, and the Doctor came running: He'd just gotten accidentally engaged to Marilyn Monroe. They took her home, tears in his eyes, and she could barely take her hand from his as he put her to sleep for the last time. They didn't tell the Doctor; he watched her go to sleep, weeping, and when the Doctor ran to get him for the next one, he put on a fake smile and told the Doctor to leave it.
"Every Christmas Eve, it's getting a bit old. Christmas is for kids, isn't it? I've got some work with my dad now, I'm going to focus on that. Get that cloud belt under control." The Doctor was hurt, but more than that he could feel something wasn't right. Some part of the story he couldn't see, that was hurting them both. That he could feel, in Kazran, making him sad. He left him the half a sonic screwdriver, and though he begged Kazran for an explanation, it hurt too much to say aloud. So he left it.