Reason goes before a Fall

John Watson is just a man. A man whose tolerance for sexual frustration has almost reached its limit. The object of his desire? Sherlock. The problem? Sherlock thinks he's straight and John doesn't think Sherlock's interested. Sherlock is just a man too, but he doesn't want to jeopardise their friendship. The solution? A prostitute who looks a lot like Sherlock. This is never going to end well...