(It's been 2 years since Sherlock's encounter with the psychopathic nurse Eurus, Sherlock has a stethoscope in his hand and is listening to the heart of 6-year-old Rosie, who is laughing happily, Joh feels that they are like a real family and wishes he had the courage to tell Sherlock the truth about how he feels about him, but he doesn't want to ruin their friendship)