My Significant Other?

What would happen if Sherlock met his genderbent self? How would he react? Sherlock and John meet two girls. Shelby and Joan. They seem to be almost the same. John and Joan are the best of friends. But, Shelby and Sherlock utterly hate each other. When a giant threat comes over London, the only people that can save the city are non other than Shelby and Sherlock. Can they get over their childish feud to save London? Is there some other feeling than hate? I only own my characters. BBC owns the rest.