**COMPLETE** This is a short story about a headcanon AU where Robin Skinner (aka Cavetown) is Sherlock's son. It links into the real plot of Sherlock and I think it's a cool idea. Oh and apparently Greg and Robin are.. A thing. So sorry about that. *** Nobody ever told me why. I've always wondered where he went. I understood that dealing with me amongst other things was difficult, but why did he have to leave? Did I scare him off? I just wanted his disappearance to make sense.