A birthday present for my best friend, Emily. “You’re it,” is significant to the both of us due to our private RP in which Sherlock and John are in a semi platonic/romantic relationship. Because the both of them are pretty pants at speaking about their feelings, this is how John first tells Sherlock he loves him. They share a tentative hug, and John murmurs, “You’re it for me.” Meaning, Sherlock is the only person he will ever love again.
Happy birthday, Emily!