doctor who only, mostly season five and ahead, and yes, it's bigger on the inside. "There is one thing you need to know about me - well one thing apart from the blue box and the two hearts - we don't walk away."
Because every time you see them happy you remember how sad they’re going to be. And it breaks your heart. Because what’s the point in them being happy now if they’re going to be sad later. The answer is, of course, because they’re going to be sad later.