|Sherlock and Watson|
Friends, Partners, Roommates, Sober Companion (Joan) to Addict (Sherlock).
Sherlock and Joan's relationship starts slowly when Joan is hired by Sherlock's father Morland Holmes to work as a sober companion to Sherlock. At first Sherlock was immensely hesitant about the idea, but he later came to accept it as his father threatened him with eviction. Joan served as Sherlock's sober companion for six weeks, then she became his partner as NYPD consultant, where the two of them solve crimes.