Can we just take a moment to appreciate this picture? Just take a nice long look.
This is obviously John in the wake of Sherlock’s death. He has grown a mustache to make himself look somewhat authoritative, more intimidating than Series 1/2 John.
Also, take note of the long coat and scarf, along with the gloves in his hand; all things Sherlock used to wear. He’s subconsciously trying to fill in for Sherlock, in his own mind and for the people around him who also lost a dear friend.
If that isn’t heartbreaking, I don’t know what is.
So I’m re-reading Philosopher’s Stone and I finally notice something. The night Harry first finds the Mirror of Erised is Christmas night. Rowling wrote it so Harry gets to spend Christmas with his family.