Hollow, that's how the Doctor felt. His chest felt cold and empty. He was on autopilot. He didn't want to think, not until he got to his final destination. If he thought, he wasn't sure if he'd make it. The only part of his brain that he let function knew how to fly the Tardis. Any other day, that wouldn't have been enough but, it's as if she knew the gravity of the situation. She was so easy to fly, a human could do it.
The Doctor, in his twelfth form, had just given River his old sonic screw driver through tears. The ginger kissed his wife's forehead before wrapping her hand around the metal tool. Choking back a sob, he told her that he loved her and that he'd see her soon. She had asked for an explanation but all he could say was, "Spoilers." She just nodded and hugged, him trying to comfort him as best she could.
The Doctor stood comatose at the controls, his trade mark black waistcoat unbuttoned and his duster thrown over the railing. He wore black slacks and a dark teal button-down with it this time. She'd recognize him instantly.
With expert timing, the Tardis landed exactly as the other Tardis departed. The Doctor threw himself out of his ship with great determination. A few of the people he'd saved had started to greet him but quieted when they saw his unfamiliar face. He wouldn't have said anything to them anyway. There was only one person he wanted to talk to at the moment.
He'd 'saved' his consciousness to the Library's mainframe which took a bit longer than he'd hoped, partly because of the vastness, partly because of his distress. He stayed patient, though. He'd see her soon.
He came to be in a field of deep red grass. Gallifrey. He knew it was just a digital recreation from River's memory but it made him feel happy as well as sad. He saw River sitting on a hill not too far off. There she was, in all her beautiful glory. The Doctor expected to feel better at this point but he didn't. He needed to hold her.
She stood up and the Doctor could tell she was grinning. She took a few lazy steps toward him, her white sundress billowing behind her. She walked slowly but at the same time, the distance between them shortened. Soon she was in front of the Doctor holding his hands in hers.
"Hello, Sweetie," she greeted before standing on the tip of her bare toes to kiss her husband.