"It works?" he asked, still not looking at her. "We grow our own TARDIS?"

He hadn't been sure that something like an infant TARDIS could survive in the alternate universe without any of its own kind, without even a proper Time Lord to link with. But if it had, at least what life he'd had in Rose's timeline wasn't just four years of normal human life on Earth. He turned to look at her, eyes wet.

"Is it a good four years?"