The meeting of a stranger

After outwitting Jamen Cassius, a corrupt scientist who is responsible for Sherlock's deaging, John and Sherlock aren't quite sure what to do. After searching endlessly for a cure for Sherlock, they quickly realize the only way to get him back to his normal self is to take a dangerous-and rather stupid-risk. But when mysterious notes keep showing up at 221B and people keep attempting to kidnap Sherlock, John decides it's worth the risk. Even if he thinks young Sherlock is pretty adorable...
(Sequel to An Awkward Situation...still will make sense if you haven't read it, but some character's I made up are introduced, so it's optional. ^.^)
(P.S. NOT MY ART. I sadly don't own these characters...)