Amy went in, leaving the Doctor on her doorstep. There were tears on his face and he slowly wiped them off with his fingers. Home, he thought. This is home. Not Amy and Rory's house, not the Earth, not even the TARDIS, although she had been the closest to a home he had thought of as such in centuries. It wasn't the places, nor the times. It was the people. Amy and Rory. They were his home. He almost shouted aloud with the joy of it, then collected himself and went into the house, into the warmth and the light and the friendship.
And she was there. River Song, his lovely and clever River Song. Of course she was; it was her parents' house and Christmastime after all. Why hadn't he expected it? He looked at her, a little warily; who knew when she was in their complicated relationship? She gazed steadily back at him, with that little half smirk, but there was something in her eyes. She was hard to read, his River, but he thought she looked equally wary. "Rory, Amy, I'd like to take your lovely daughter for a walk before dinner, yeah?" He didn't wait for their answer, just grabbed River by the hand and led her out the door.
"What is it, my love?"
"I..." He didn't know where to begin. "I... River, I..." His eyes filled with tears again. "Right," he muttered under his breath, "All very good to have some humany-wumany emotion but if it's going to happen all the time..." She looked at him, perplexed. He took a deep breath. "River. I need you to know... I've only just realized... it's home. You are home. You and Amy and Rory... you're my home. I..." Frustrated with his own inability to find the right words, he gripped the mass of curls at the back of her head and kissed her, pouring all the caring and frustration and longing for a home of his own into the kiss. She leaned into him, fisting her own hands into his hair, kissing him back. They broke apart as the snowflakes started to fall.
"Of course we are, my love. Always and completely. Now let's go home."
They turned, hand in hand, toward the lights and music of the Pond home.