Always A Neverland

John is living a quiet life at 221B with his son when Sherlock Holmes, dead and gone ten years, appears at his door. There's an excellent reason he's been gone, and several very good ones for taking him back, but the best one of all is Will, who falls in love with Sherlock as surely as John once did. Sherlock/John past John/Mary kid!fic past drug use post-RF Reunion Fic