The years flew by quicker than he would have liked. He stayed by Rose's side as her hair turned gray and she slowed down. They traveled until she couldn't anymore and then once more he parked the Tardis. Rather than returning to work he spent his days taking care of her as she slipped further and further away from him.
She was hardly aware he was in the room anymore but he still talked to her constantly and told her all about his life. Then one evening he entered the room to find her staring at the door. "I want to go home," she cried and he held her long after she fell asleep. He was still holding her as she took her last breath.
He burned her body in the traditions of Gallifrey, and gave her body back to the earth and the air. He stood at the fireside holding their daughter. She hadn't stopped crying while his face held all of the grief but none of the tears. As the fire burned out he heard a noise unlike he had heard in years. Turning he saw the Metacrisis stepping out of his Tardis.
"You don't belong here," He said turning back towards the fire.
"Neither do you." The metacrisis responded hobbling over. "It's time you returned home. That universe still needs the Doctor."
He argued and argued but in the end it was useless. He knew he was right and so kissing his daughter goodbye, he returned to the universe he had left behind. She would have returned with him had he asked but they both knew he never would. When he returned he was angry and the anger flowed out of him as he declared himself the Time Lord Victorious, costing someone their life. And in the end costing him his own.
He fought the regeneration for as long as he could, he didn't want to lose the body that Rose had loved and that had loved her in return. As his life was coming to a close he said goodbye to all of his former companions before landing in front of the Powell Estate. He had to see her one last time, he had to tell her goodbye. But as he opened his mouth, he surprised himself by telling her she was going to have a great year.
And somewhere out there she was waiting for him.