A Self Portrait

When Elizabeth and Arabella Carter move into 221C, it's like a dream come true. Sadly, this isn't the fantasy they expected. Sherlock is a nuisance and John is the only one who can put up with him. Will time change that or will it be enough to drive the two sisters out of the flat for good? What happens when Moriarty comes along? Sherlock/OC and John OC. (Slow-burn and realistic.)