There exists a disease in which a child is born with only half a functioning heart. The right side may work on its own for a time, but a heart cannot beat without its other half. But with care the other side of the heart can be guided toward life.

After Reichenbach, Sherlock's Alzheimer's mother visits John and shows him old photos and videos of Sherlock. She's convinced her son is not dead. John just thinks she's mad. Three years later, he regrets not having listened to her. Oneshot. Angst. Fluff.

Sherlock is diagnosed with a terminal illness. Warning: angst like whoa.

'Please confirm that you are a human below' the page that comes up on Sherlock's netbook reads.